This patchset provides the changes required for
the AppArmor security module to stack safely with any other.
v35: Rebase to 5.18-rc2
Address the case where CONFIG_SECURITY is enabled but
no security modules that use secid slots are included.
The resulting blob.secid[0] instances, although never
present in a call path, raised concerns.
Address the case in interface_lsm where the BPF module
returns -EINVAL, resulting in a failed setting of the
value that would be otherwise allowed.
v34: Rebase to 5.18-rc1
Incorporate feedback on the audit generation.
v33: Rework the supplimental audit record generation once more,
this time taking pseudo-code provided by Paul Moore as a
basis. The resulting code is considerably simpler and fits
better with the existing code flow.
v32: Rebase to 5.17-rc2
Incorporate additional feedback from v30.
v31: Rebase to 5.16-rc4
Incorporate feedback from Paul Moore on the audit
component changes.
v30: Rebase to 5.16-rc1
Replace the integrity sub-system reuse of the audit
subsystem event matching functions with IMA specific
functions. This is done because audit needs to maintain
information about multiple security modules in audit
rules while IMA to restricts the information to a single
security module.
The binder hooks have been changed and are no longer
called with sufficient information to identify the
interface_lsm. Pass that information in the binder
message, and use that in the compatibility decision.
Refactor the audit changes.
v29: Rebase to 5.15-rc1
Rework the supplimental audit record generation. Attach
a list of supplimental data to the audit_buffer and
generate the auxiliary records as needed on event end.
This should be usable for other auxiliary data, such as
container IDs. There is other ongoing audit work that
will require integration with this.
v28: Rebase to 5.14-rc2
Provide IMA rules bounds checking (patch 04)
Quote contexts in MAC_TASK_CONTEXTS and MAC_OBJ_CONTEXTS
audit records because of AppArmor's use of '=' in context
values. (patch 22,23)
v27: Fixes for landlock (patch 02)
Rework the subject audit record generation. This version is
simpler and reflects feedback from Paul Moore. (patch 22)
v26: Rebase to 5.13-rc1
Include the landlock security module.
Accomodate change from security_task_getsecid() to
security_task_getsecid_obj() and security_task_getsecid_subj().
v25: Rebase to 5.12-rc2
Incorporate feedback from v24
- The IMA team suggested improvements to the integrity rule
processing.
v24: Rebase to 5.11-rc1
Incorporate feedback from v23
- Address the IMA team's concerns about "label collisions".
A label collision occurs when there is ambiguity about
which of multiple LSMs is being targeted in the definition
of an integrity check rule. A system with Smack and
AppArmor would be unable to distinguish which LSM is
important to an integrity rule referrencing the label
"unconfined" as that label is meaningful to both.
Provide a boot option to specify which LSM will be used in
IMA rules when multiple LSMs are present. (patch 04)
Pull LSM "slot" identification from later audit patches in
in support of this (patch 03).
- Pick up a few audit events that need to include supplimental
subject context records that had been missed in the
previous version.
v23: Rebase to 5.10-rc4
Incorporate feedback from v22
- Change /proc/*/attr/display to /proc/*/attr/interface_lsm to
make the purpose clearer. (patch 0012)
- Include ABI documentation. (patch 0012, 0022)
- Introduce LSM documentation updates with the patches where
the interfaces are added rather than at the end. (patch 0012, 0022)
Include more maintainers and mail lists in To: and Cc: directives.
v22: Rebase to 5.10-rc1
v21: Rebase to 5.9-rc4
Incorporate feedback from v20
- Further revert UDS SO_PEERSEC to use scaffolding around
the interfaces that use lsmblobs and store only a single
secid. The possibility of multiple security modules
requiring data here is still a future problem.
- Incorporate Richard Guy Briggs' non-syscall auxiliary
records patch (patch 0019-0021) in place of my "supplimental"
records implementation. [I'm not sure I've given proper
attestation. I will correct as appropriate]
v20: Rebase to 5.9-rc1
Change the BPF security module to use the lsmblob data. (patch 0002)
Repair length logic in subject label processing (patch 0015)
Handle -EINVAL from the empty BPF setprocattr hook (patch 0020)
Correct length processing in append_ctx() (patch 0022)
v19: Rebase to 5.8-rc6
Incorporate feedback from v18
- Revert UDS SO_PEERSEC implementation to use lsmblobs
directly, rather than allocating as needed. The correct
treatment of out-of-memory conditions in the later case
is difficult to define. (patch 0005)
- Use a size_t in append_ctx() (patch 0021)
- Fix a memory leak when creating compound contexts. (patch 0021)
Fix build error when CONFIG_SECURITY isn't set (patch 0013)
Fix build error when CONFIG_SECURITY isn't set (patch 0020)
Fix build error when CONFIG_SECURITY isn't set (patch 0021)
v18: Rebase to 5.8-rc3
Incorporate feedback from v17
- Null pointer checking in UDS (patch 0005)
Match changes in IMA code (patch 0012)
Fix the behavior of LSM context supplimental audit
records so that there's always exactly one when it's
appropriate for there to be one. This is a substantial
change that requires extention of the audit_context beyond
syscall events. (patch 0020)
v17: Rebase to 5.7-rc4
v16: Rebase to 5.6
Incorporate feedback from v15 - Thanks Stephen, Mimi and Paul
- Generally improve commit messages WRT scaffolding
- Comment ima_lsm_isset() (patch 0002)
- Some question may remain on IMA warning (patch 0002)
- Mark lsm_slot as __lsm_ro_after_init not __init_data (patch 0002)
- Change name of lsmblob variable in ima_match_rules() (patch 0003)
- Instead of putting a struct lsmblob into the unix_skb_parms
structure put a pointer to an allocated instance. There is
currently only space for 5 u32's in unix_skb_parms and it is
likely to get even tighter. Fortunately, the lifecycle
management of the allocated lsmblob is simple. (patch 0005)
- Dropped Acks due to the above change (patch 0005)
- Improved commentary on secmark labeling scaffolding. (patch 0006)
- Reduced secmark related labeling scaffolding. (patch 0006)
- Replace use of the zeroth entry of an lsmblob in scaffolding
with a function lsmblob_value() to hopefully make it less
obscure. (patch 0006)
- Convert security_secmark_relabel_packet to use lsmblob as
this reduces much of the most contentious scaffolding. (patch 0006)
- Dropped Acks due to the above change (patch 0006)
- Added BUILD_BUG_ON() for CIPSO tag 6. (patch 0018)
- Reworked audit subject information. Instead of adding fields in
the middle of existing records add a new record to the event. When
a separate record is required use subj="?". (patch 0020)
- Dropped Acks due to the above change (patch 0020)
- Reworked audit object information. Instead of adding fields in
the middle of existing records add a new record to the event. When
a separate record is required use obj="?". (patch 0021)
- Dropped Acks due to the above change (patch 0021)
- Enhanced documentation (patch 0022)
- Removed unnecessary error code check in security_getprocattr()
(patch 0021)
v15: Rebase to 5.6-rc1
- Revise IMA data use (patch 0002)
Incorporate feedback from v14
- Fix lockdown module registration naming (patch 0002)
- Revise how /proc/self/attr/context is gathered. (patch 0022)
- Revise access modes on /proc/self/attr/context. (patch 0022)
- Revise documentation on LSM external interfaces. (patch 0022)
v14: Rebase to 5.5-rc5
Incorporate feedback from v13
- Use an array of audit rules (patch 0002)
- Significant change, removed Acks (patch 0002)
- Remove unneeded include (patch 0013)
- Use context.len correctly (patch 0015)
- Reorder code to be more sensible (patch 0016)
- Drop SO_PEERCONTEXT as it's not needed yet (patch 0023)
v13: Rebase to 5.5-rc2
Incorporate feedback from v12
- Print lsmblob size with %z (Patch 0002)
- Convert lockdown LSM initialization. (Patch 0002)
- Restore error check in nft_secmark_compute_secid (Patch 0006)
- Correct blob scaffolding in ima_must_appraise() (Patch 0009)
- Make security_setprocattr() clearer (Patch 0013)
- Use lsm_task_display more widely (Patch 0013)
- Use passed size in lsmcontext_init() (Patch 0014)
- Don't add a smack_release_secctx() hook (Patch 0014)
- Don't print warning in security_release_secctx() (Patch 0014)
- Don't duplicate the label in nfs4_label_init_security() (Patch 0016)
- Remove reviewed-by as code has significant change (Patch 0016)
- Send the entire lsmblob for Tag 6 (Patch 0019)
- Fix description of socket_getpeersec_stream parameters (Patch 0023)
- Retain LSMBLOB_FIRST. What was I thinking? (Patch 0023)
- Add compound context to LSM documentation (Patch 0023)
v12: Rebase to 5.5-rc1
Fixed a couple of incorrect contractions in the text.
v11: Rebase to 5.4-rc6
Incorporate feedback from v10
- Disambiguate reading /proc/.../attr/display by restricting
all use of the interface to the current process.
- Fix a merge error in AppArmor's display attribute check
v10: Ask the security modules if the display can be changed.
v9: There is no version 9
v8: Incorporate feedback from v7
- Minor clean-up in display value management
- refactor "compound" context creation to use a common
append_ctx() function.
v7: Incorporate feedback from v6
- Make setting the display a privileged operation. The
availability of compound contexts reduces the need for
setting the display.
v6: Incorporate feedback from v5
- Add subj_<lsm>= and obj_<lsm>= fields to audit records
- Add /proc/.../attr/context to get the full context in
lsmname\0value\0... format as suggested by Simon McVittie
- Add SO_PEERCONTEXT for getsockopt() to get the full context
in the same format, also suggested by Simon McVittie.
- Add /sys/kernel/security/lsm_display_default to provide
the display default value.
v5: Incorporate feedback from v4
- Initialize the lsmcontext in security_secid_to_secctx()
- Clear the lsmcontext in all security_release_secctx() cases
- Don't use the "display" on strictly internal context
interfaces.
- The SELinux binder hooks check for cases where the context
"display" isn't compatible with SELinux.
v4: Incorporate feedback from v3
- Mark new lsm_<blob>_alloc functions static
- Replace the lsm and slot fields of the security_hook_list
with a pointer to a LSM allocated lsm_id structure. The
LSM identifies if it needs a slot explicitly. Use the
lsm_id rather than make security_add_hooks return the
slot value.
- Validate slot values used in security.c
- Reworked the "display" process attribute handling so that
it works right and doesn't use goofy list processing.
- fix display value check in dentry_init_security
- Replace audit_log of secids with '?' instead of deleting
the audit log
v3: Incorporate feedback from v2
- Make lsmblob parameter and variable names more
meaningful, changing "le" and "l" to "blob".
- Improve consistency of constant naming.
- Do more sanity checking during LSM initialization.
- Be a bit clearer about what is temporary scaffolding.
- Rather than clutter security_getpeersec_dgram with
otherwise unnecessary checks remove the apparmor
stub, which does nothing useful.
Patch 01 separates the audit rule processing from the
integrity rule processing. They were never really the
same, but void pointers could hide that. The changes
following use the rule pointers differently in audit
and IMA, so keeping the code common is not a good idea.
Patch 02 moves management of the sock security blob
from the individual modules to the infrastructure.
Patches 03-04 introduce a structure "lsmblob" that will gradually
replace the "secid" as a shorthand for security module information.
At this point lsmblob contains an array of u32 secids, one "slot"
for each of the security modules compiled into the kernel that
used secids. A "slot" is allocated when a security module requests
one.
Patch 05 provides mechanism for the IMA subsystem to identify
explicitly which LSM is subject to IMA policy. This includes
a boot option for specifying the default and an additional option
in IMA rules "lsm=".
Patches 06-15 change LSM interfaces to use the lsmblob instead
of secids. It is important that the lsmblob be a fixed size entity
that does not have to be allocated. Several of the places
where it is used would have performance and/or locking
issues with dynamic allocation.
Patch 15 provides a mechanism for a process to identify which
security module's hooks should be used when displaying or
converting a security context string. A new interface
/proc/self/attr/interface_lsm contains the name of the security
module to show. Reading from this file will present the name of
the module, while writing to it will set the value. Only names
of active security modules are accepted. Internally, the name
is translated to the appropriate "slot" number for the module
which is then stored in the task security blob. Setting the
display requires that all modules using the /proc interfaces
allow the transition. The interface LSM of other processess
can be neither read nor written. All suggested cases for
reading the interface LSM of a different process have race
conditions.
Patch 16 Starts the process of changing how a security
context is represented. Since it is possible for a
security context to have been generated by more than one
security module it is now necessary to note which module
created a security context so that the correct "release"
hook can be called. There are several places where the
module that created a security context cannot be inferred.
This is achieved by introducing a "lsmcontext" structure
which contains the context string, its length and the
"slot" number of the security module that created it.
The security_release_secctx() interface is changed,
replacing the (string,len) pointer pair with a lsmcontext
pointer.
Patches 17-18 convert the security interfaces from
(string,len) pointer pairs to a lsmcontext pointer.
The slot number identifying the creating module is
added by the infrastructure. Where the security context
is stored for extended periods the data type is changed.
The Netlabel code is converted to save lsmblob structures
instead of secids in Patch 19. This is not strictly
necessary as there can only be one security module that
uses Netlabel at this point. Using a lsmblob is much
cleaner, as the interfaces that use the data have all
been converted.
Patch 20 adds checks to the binder hooks which verify
that both ends of a transaction use the same interface LSM.
Patch 21 adds a parameter to security_secid_to_secctx()
that indicates which of the security modules should be used
to provide the context.
Patches 22-25 provide mechanism to keeping a list of auxiliary
record data in an audit_buffer. The list is read when the
audit record is ended, and supplimental records are created
as needed.
Patch 26 adds a supplimental audit record for subject
LSM data when there are multiple security modules with such data.
The AUDIT_MAC_TASK_CONTEXTS record is used in conjuction with a
"subj=?" field to identify the subject data. The
AUDIT_MAC_TASK_CONTEXTS record identifies the security module
with the data: subj_selinux=xyz_t subj_apparmor=abc.
An example of the MAC_TASK_CONTEXTS (1420) record is:
type=UNKNOWN[1420]
msg=audit(1600880931.832:113)
subj_apparmor==unconfined
subj_smack=_
Patch 27 adds a supplimental audit record for object
LSM data when there are multiple security modules with such data.
The AUDIT_MAC_OBJ_CONTEXTS record is used in conjuction The
with a "obj=?" field to identify the object data.
The AUDIT_MAC_OBJ_CONTEXTS record identifies the security module
with the data: obj_selinux="xyz_t obj_apparmor="abc". While
AUDIT_MAC_TASK_CONTEXTS records will always contain an entry
for each possible security modules, AUDIT_MAC_OBJ_CONTEXTS
records will only contain entries for security modules for
which the object in question has data.
An example of the MAC_OBJ_CONTEXTS (1421) record is:
type=UNKNOWN[1421]
msg=audit(1601152467.009:1050):
obj_selinux=unconfined_u:object_r:user_home_t:s0
Patch 28 adds a new interface for getting the compound security
contexts, /proc/self/attr/context. An example of the content
of this file is:
selinux\0one_u:one_r:one_t:s0-s0:c0.c1023\0apparmor\0unconfined\0
Finally, with all interference on the AppArmor hooks removed,
Patch 29 removes the exclusive bit from AppArmor. An unnecessary
stub hook was also removed.
The Ubuntu project is using an earlier version of this patchset in
their distribution to enable stacking for containers.
Performance measurements to date have the change within the "noise".
The sockperf and dbench results are on the order of 0.2% to 0.8%
difference, with better performance being as common as worse. The
benchmarks were run with AppArmor and Smack on Ubuntu.
https://github.com/cschaufler/lsm-stacking.git#stack-5.18-rc2-v35
Casey Schaufler (29):
integrity: disassociate ima_filter_rule from security_audit_rule
LSM: Infrastructure management of the sock security
LSM: Add the lsmblob data structure.
LSM: provide lsm name and id slot mappings
IMA: avoid label collisions with stacked LSMs
LSM: Use lsmblob in security_audit_rule_match
LSM: Use lsmblob in security_kernel_act_as
LSM: Use lsmblob in security_secctx_to_secid
LSM: Use lsmblob in security_secid_to_secctx
LSM: Use lsmblob in security_ipc_getsecid
LSM: Use lsmblob in security_current_getsecid
LSM: Use lsmblob in security_inode_getsecid
LSM: Use lsmblob in security_cred_getsecid
LSM: Specify which LSM to display
LSM: Ensure the correct LSM context releaser
LSM: Use lsmcontext in security_secid_to_secctx
LSM: Use lsmcontext in security_inode_getsecctx
LSM: security_secid_to_secctx in netlink netfilter
NET: Store LSM netlabel data in a lsmblob
binder: Pass LSM identifier for confirmation
LSM: Extend security_secid_to_secctx to include module selection
Audit: Keep multiple LSM data in audit_names
Audit: Create audit_stamp structure
LSM: Add a function to report multiple LSMs
Audit: Allow multiple records in an audit_buffer
Audit: Add record for multiple task security contexts
Audit: Add record for multiple object contexts
LSM: Add /proc attr entry for full LSM context
AppArmor: Remove the exclusive flag
Documentation/ABI/testing/ima_policy | 8 +-
.../ABI/testing/procfs-attr-lsm_display | 22 +
Documentation/security/lsm.rst | 28 +
drivers/android/binder.c | 47 +-
drivers/android/binder_internal.h | 1 +
fs/ceph/xattr.c | 6 +-
fs/nfs/nfs4proc.c | 8 +-
fs/nfsd/nfs4xdr.c | 20 +-
fs/proc/base.c | 2 +
include/linux/audit.h | 15 +-
include/linux/cred.h | 3 +-
include/linux/lsm_hooks.h | 19 +-
include/linux/security.h | 263 +++++++-
include/net/netlabel.h | 8 +-
include/net/scm.h | 15 +-
include/uapi/linux/audit.h | 2 +
kernel/audit.c | 253 +++++--
kernel/audit.h | 17 +-
kernel/auditfilter.c | 29 +-
kernel/auditsc.c | 160 ++---
kernel/cred.c | 12 +-
net/ipv4/cipso_ipv4.c | 26 +-
net/ipv4/ip_sockglue.c | 12 +-
net/netfilter/nf_conntrack_netlink.c | 24 +-
net/netfilter/nf_conntrack_standalone.c | 11 +-
net/netfilter/nfnetlink_queue.c | 38 +-
net/netfilter/nft_meta.c | 10 +-
net/netfilter/xt_SECMARK.c | 7 +-
net/netlabel/netlabel_kapi.c | 6 +-
net/netlabel/netlabel_unlabeled.c | 100 ++-
net/netlabel/netlabel_unlabeled.h | 2 +-
net/netlabel/netlabel_user.c | 13 +-
net/netlabel/netlabel_user.h | 6 +-
security/apparmor/include/apparmor.h | 3 +-
security/apparmor/include/net.h | 6 +-
security/apparmor/include/procattr.h | 2 +-
security/apparmor/lsm.c | 105 +--
security/apparmor/procattr.c | 22 +-
security/bpf/hooks.c | 12 +-
security/commoncap.c | 7 +-
security/integrity/ima/ima.h | 26 -
security/integrity/ima/ima_appraise.c | 11 +-
security/integrity/ima/ima_main.c | 71 +-
security/integrity/ima/ima_policy.c | 58 +-
security/landlock/cred.c | 2 +-
security/landlock/fs.c | 2 +-
security/landlock/ptrace.c | 2 +-
security/landlock/setup.c | 5 +
security/landlock/setup.h | 1 +
security/loadpin/loadpin.c | 8 +-
security/lockdown/lockdown.c | 7 +-
security/safesetid/lsm.c | 8 +-
security/security.c | 615 ++++++++++++++++--
security/selinux/hooks.c | 103 +--
security/selinux/include/classmap.h | 3 +-
security/selinux/include/objsec.h | 5 +
security/selinux/include/security.h | 1 +
security/selinux/netlabel.c | 25 +-
security/selinux/ss/services.c | 4 +-
security/smack/smack.h | 6 +
security/smack/smack_access.c | 2 +-
security/smack/smack_lsm.c | 91 +--
security/smack/smack_netfilter.c | 4 +-
security/smack/smackfs.c | 10 +-
security/tomoyo/tomoyo.c | 8 +-
security/yama/yama_lsm.c | 7 +-
66 files changed, 1776 insertions(+), 659 deletions(-)
create mode 100644 Documentation/ABI/testing/procfs-attr-lsm_display
base-commit: ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e
--
2.35.1
Add a new boolean function lsm_multiple_contexts() to
identify when multiple security modules provide security
context strings.
Signed-off-by: Casey Schaufler <[email protected]>
---
include/linux/security.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/security.h b/include/linux/security.h
index 2150016492be..3fab84220f88 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -232,6 +232,15 @@ static inline bool lsmblob_equal(const struct lsmblob *bloba,
extern int lsm_name_to_slot(char *name);
extern const char *lsm_slot_to_name(int slot);
+static inline bool lsm_multiple_contexts(void)
+{
+#ifdef CONFIG_SECURITY
+ return lsm_slot_to_name(1) != NULL;
+#else
+ return false;
+#endif
+}
+
/**
* lsmblob_value - find the first non-zero value in an lsmblob structure.
* @blob: Pointer to the data
--
2.35.1
Replace the timestamp and serial number pair used in audit records
with a structure containing the two elements.
Signed-off-by: Casey Schaufler <[email protected]>
Acked-by: Paul Moore <[email protected]>
---
kernel/audit.c | 17 +++++++++--------
kernel/audit.h | 12 +++++++++---
kernel/auditsc.c | 22 +++++++++-------------
3 files changed, 27 insertions(+), 24 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index 28ff7a5f90bd..6b6c089512f7 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1822,11 +1822,11 @@ unsigned int audit_serial(void)
}
static inline void audit_get_stamp(struct audit_context *ctx,
- struct timespec64 *t, unsigned int *serial)
+ struct audit_stamp *stamp)
{
- if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
- ktime_get_coarse_real_ts64(t);
- *serial = audit_serial();
+ if (!ctx || !auditsc_get_stamp(ctx, stamp)) {
+ ktime_get_coarse_real_ts64(&stamp->ctime);
+ stamp->serial = audit_serial();
}
}
@@ -1849,8 +1849,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
int type)
{
struct audit_buffer *ab;
- struct timespec64 t;
- unsigned int serial;
+ struct audit_stamp stamp;
if (audit_initialized != AUDIT_INITIALIZED)
return NULL;
@@ -1905,12 +1904,14 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
return NULL;
}
- audit_get_stamp(ab->ctx, &t, &serial);
+ audit_get_stamp(ab->ctx, &stamp);
/* cancel dummy context to enable supporting records */
if (ctx)
ctx->dummy = 0;
audit_log_format(ab, "audit(%llu.%03lu:%u): ",
- (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial);
+ (unsigned long long)stamp.ctime.tv_sec,
+ stamp.ctime.tv_nsec/1000000,
+ stamp.serial);
return ab;
}
diff --git a/kernel/audit.h b/kernel/audit.h
index 4af63e7dde17..260dab6e0e15 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -99,6 +99,12 @@ struct audit_proctitle {
char *value; /* the cmdline field */
};
+/* A timestamp/serial pair to identify an event */
+struct audit_stamp {
+ struct timespec64 ctime; /* time of syscall entry */
+ unsigned int serial; /* serial number for record */
+};
+
/* The per-task audit context. */
struct audit_context {
int dummy; /* must be the first element */
@@ -108,10 +114,10 @@ struct audit_context {
AUDIT_CTX_URING, /* in use by io_uring */
} context;
enum audit_state state, current_state;
+ struct audit_stamp stamp; /* event identifier */
unsigned int serial; /* serial number for record */
int major; /* syscall number */
int uring_op; /* uring operation */
- struct timespec64 ctime; /* time of syscall entry */
unsigned long argv[4]; /* syscall arguments */
long return_code;/* syscall return code */
u64 prio;
@@ -265,7 +271,7 @@ extern void audit_put_tty(struct tty_struct *tty);
#ifdef CONFIG_AUDITSYSCALL
extern unsigned int audit_serial(void);
extern int auditsc_get_stamp(struct audit_context *ctx,
- struct timespec64 *t, unsigned int *serial);
+ struct audit_stamp *stamp);
extern void audit_put_watch(struct audit_watch *watch);
extern void audit_get_watch(struct audit_watch *watch);
@@ -306,7 +312,7 @@ extern void audit_filter_inodes(struct task_struct *tsk,
struct audit_context *ctx);
extern struct list_head *audit_killed_trees(void);
#else /* CONFIG_AUDITSYSCALL */
-#define auditsc_get_stamp(c, t, s) 0
+#define auditsc_get_stamp(c, s) 0
#define audit_put_watch(w) do { } while (0)
#define audit_get_watch(w) do { } while (0)
#define audit_to_watch(k, p, l, o) (-EINVAL)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 6fe9f2525fc1..557713954a69 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -992,10 +992,10 @@ static void audit_reset_context(struct audit_context *ctx)
*/
ctx->current_state = ctx->state;
- ctx->serial = 0;
+ ctx->stamp.serial = 0;
ctx->major = 0;
ctx->uring_op = 0;
- ctx->ctime = (struct timespec64){ .tv_sec = 0, .tv_nsec = 0 };
+ ctx->stamp.ctime = (struct timespec64){ .tv_sec = 0, .tv_nsec = 0 };
memset(ctx->argv, 0, sizeof(ctx->argv));
ctx->return_code = 0;
ctx->prio = (ctx->state == AUDIT_STATE_RECORD ? ~0ULL : 0);
@@ -1950,7 +1950,7 @@ void __audit_uring_entry(u8 op)
ctx->context = AUDIT_CTX_URING;
ctx->current_state = ctx->state;
- ktime_get_coarse_real_ts64(&ctx->ctime);
+ ktime_get_coarse_real_ts64(&ctx->stamp.ctime);
}
/**
@@ -2066,7 +2066,7 @@ void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
context->argv[3] = a4;
context->context = AUDIT_CTX_SYSCALL;
context->current_state = state;
- ktime_get_coarse_real_ts64(&context->ctime);
+ ktime_get_coarse_real_ts64(&context->stamp.ctime);
}
/**
@@ -2535,21 +2535,17 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
/**
* auditsc_get_stamp - get local copies of audit_context values
* @ctx: audit_context for the task
- * @t: timespec64 to store time recorded in the audit_context
- * @serial: serial value that is recorded in the audit_context
+ * @stamp: timestamp to record
*
* Also sets the context as auditable.
*/
-int auditsc_get_stamp(struct audit_context *ctx,
- struct timespec64 *t, unsigned int *serial)
+int auditsc_get_stamp(struct audit_context *ctx, struct audit_stamp *stamp)
{
if (ctx->context == AUDIT_CTX_UNUSED)
return 0;
- if (!ctx->serial)
- ctx->serial = audit_serial();
- t->tv_sec = ctx->ctime.tv_sec;
- t->tv_nsec = ctx->ctime.tv_nsec;
- *serial = ctx->serial;
+ if (!ctx->stamp.serial)
+ ctx->stamp.serial = audit_serial();
+ *stamp = ctx->stamp;
if (!ctx->prio) {
ctx->prio = 1;
ctx->current_state = AUDIT_STATE_RECORD;
--
2.35.1
Change the secid parameter of security_audit_rule_match
to a lsmblob structure pointer. Pass the entry from the
lsmblob structure for the approprite slot to the LSM hook.
Change the users of security_audit_rule_match to use the
lsmblob instead of a u32. The scaffolding function lsmblob_init()
fills the blob with the value of the old secid, ensuring that
it is available to the appropriate module hook. The sources of
the secid, security_task_getsecid() and security_inode_getsecid(),
will be converted to use the blob structure later in the series.
At the point the use of lsmblob_init() is dropped.
Signed-off-by: Casey Schaufler <[email protected]>
Acked-by: Paul Moore <[email protected]>
Cc: [email protected]
---
include/linux/security.h | 5 +++--
kernel/auditfilter.c | 6 ++++--
kernel/auditsc.c | 16 +++++++++++-----
security/security.c | 5 +++--
4 files changed, 21 insertions(+), 11 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 3666eddad59a..ee5d14dac65f 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1955,7 +1955,7 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer)
int security_audit_rule_init(u32 field, u32 op, char *rulestr,
struct audit_lsm_rules *lsmrules);
int security_audit_rule_known(struct audit_krule *krule);
-int security_audit_rule_match(u32 secid, u32 field, u32 op,
+int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
struct audit_lsm_rules *lsmrules);
void security_audit_rule_free(struct audit_lsm_rules *lsmrules);
@@ -1972,7 +1972,8 @@ static inline int security_audit_rule_known(struct audit_krule *krule)
return 0;
}
-static inline int security_audit_rule_match(u32 secid, u32 field, u32 op,
+static inline int security_audit_rule_match(struct lsmblob *blob,
+ u32 field, u32 op,
struct audit_lsm_rules *lsmrules)
{
return 0;
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index de75bd6ad866..15cd4fe35e9c 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1337,6 +1337,7 @@ int audit_filter(int msgtype, unsigned int listtype)
for (i = 0; i < e->rule.field_count; i++) {
struct audit_field *f = &e->rule.fields[i];
+ struct lsmblob blob;
pid_t pid;
u32 sid;
@@ -1369,8 +1370,9 @@ int audit_filter(int msgtype, unsigned int listtype)
case AUDIT_SUBJ_CLR:
if (f->lsm_str) {
security_current_getsecid_subj(&sid);
- result = security_audit_rule_match(sid,
- f->type, f->op,
+ lsmblob_init(&blob, sid);
+ result = security_audit_rule_match(
+ &blob, f->type, f->op,
&f->lsm_rules);
}
break;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d272b5cf18a8..a9d5bfa37cb3 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -468,6 +468,7 @@ static int audit_filter_rules(struct task_struct *tsk,
const struct cred *cred;
int i, need_sid = 1;
u32 sid;
+ struct lsmblob blob;
unsigned int sessionid;
if (ctx && rule->prio <= ctx->prio)
@@ -678,8 +679,10 @@ static int audit_filter_rules(struct task_struct *tsk,
security_current_getsecid_subj(&sid);
need_sid = 0;
}
- result = security_audit_rule_match(sid, f->type,
- f->op, &f->lsm_rules);
+ lsmblob_init(&blob, sid);
+ result = security_audit_rule_match(&blob,
+ f->type, f->op,
+ &f->lsm_rules);
}
break;
case AUDIT_OBJ_USER:
@@ -692,15 +695,17 @@ static int audit_filter_rules(struct task_struct *tsk,
if (f->lsm_str) {
/* Find files that match */
if (name) {
+ lsmblob_init(&blob, name->osid);
result = security_audit_rule_match(
- name->osid,
+ &blob,
f->type,
f->op,
&f->lsm_rules);
} else if (ctx) {
list_for_each_entry(n, &ctx->names_list, list) {
+ lsmblob_init(&blob, n->osid);
if (security_audit_rule_match(
- n->osid, f->type, f->op,
+ &blob, f->type, f->op,
&f->lsm_rules)) {
++result;
break;
@@ -710,7 +715,8 @@ static int audit_filter_rules(struct task_struct *tsk,
/* Find ipc objects that match */
if (!ctx || ctx->type != AUDIT_IPC)
break;
- if (security_audit_rule_match(ctx->ipc.osid,
+ lsmblob_init(&blob, ctx->ipc.osid);
+ if (security_audit_rule_match(&blob,
f->type, f->op,
&f->lsm_rules))
++result;
diff --git a/security/security.c b/security/security.c
index 9e0139b0d346..ced1c76a380f 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2703,7 +2703,7 @@ void security_audit_rule_free(struct audit_lsm_rules *lsmrules)
}
}
-int security_audit_rule_match(u32 secid, u32 field, u32 op,
+int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
struct audit_lsm_rules *lsmrules)
{
struct security_hook_list *hp;
@@ -2714,7 +2714,8 @@ int security_audit_rule_match(u32 secid, u32 field, u32 op,
continue;
if (lsmrules->rule[hp->lsmid->slot] == NULL)
continue;
- rc = hp->hook.audit_rule_match(secid, field, op,
+ rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot],
+ field, op,
&lsmrules->rule[hp->lsmid->slot]);
if (rc)
return rc;
--
2.35.1
Replace the osid field in the audit_names structure
with a lsmblob structure. This accomodates the use
of an lsmblob in security_audit_rule_match() and
security_inode_getsecid().
Signed-off-by: Casey Schaufler <[email protected]>
Acked-by: Paul Moore <[email protected]>
---
kernel/audit.h | 2 +-
kernel/auditsc.c | 22 ++++++++--------------
2 files changed, 9 insertions(+), 15 deletions(-)
diff --git a/kernel/audit.h b/kernel/audit.h
index 316fac62d5f7..4af63e7dde17 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -82,7 +82,7 @@ struct audit_names {
kuid_t uid;
kgid_t gid;
dev_t rdev;
- u32 osid;
+ struct lsmblob lsmblob;
struct audit_cap_data fcap;
unsigned int fcap_ver;
unsigned char type; /* record type */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 231631f61550..6fe9f2525fc1 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -700,17 +700,16 @@ static int audit_filter_rules(struct task_struct *tsk,
* lsmblob, which happens later in
* this patch set.
*/
- lsmblob_init(&blob, name->osid);
result = security_audit_rule_match(
- &blob,
+ &name->lsmblob,
f->type,
f->op,
&f->lsm_rules);
} else if (ctx) {
list_for_each_entry(n, &ctx->names_list, list) {
- lsmblob_init(&blob, n->osid);
if (security_audit_rule_match(
- &blob, f->type, f->op,
+ &n->lsmblob,
+ f->type, f->op,
&f->lsm_rules)) {
++result;
break;
@@ -1589,13 +1588,12 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
from_kgid(&init_user_ns, n->gid),
MAJOR(n->rdev),
MINOR(n->rdev));
- if (n->osid != 0) {
- struct lsmblob blob;
+ if (lsmblob_is_set(&n->lsmblob)) {
struct lsmcontext lsmctx;
- lsmblob_init(&blob, n->osid);
- if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) {
- audit_log_format(ab, " osid=%u", n->osid);
+ if (security_secid_to_secctx(&n->lsmblob, &lsmctx,
+ LSMBLOB_FIRST)) {
+ audit_log_format(ab, " osid=?");
if (call_panic)
*call_panic = 2;
} else {
@@ -2297,17 +2295,13 @@ static void audit_copy_inode(struct audit_names *name,
const struct dentry *dentry,
struct inode *inode, unsigned int flags)
{
- struct lsmblob blob;
-
name->ino = inode->i_ino;
name->dev = inode->i_sb->s_dev;
name->mode = inode->i_mode;
name->uid = inode->i_uid;
name->gid = inode->i_gid;
name->rdev = inode->i_rdev;
- security_inode_getsecid(inode, &blob);
- /* scaffolding until osid is updated */
- name->osid = lsmblob_first(&blob);
+ security_inode_getsecid(inode, &name->lsmblob);
if (flags & AUDIT_INODE_NOEVAL) {
name->fcap_ver = -1;
return;
--
2.35.1
Move management of the sock->sk_security blob out
of the individual security modules and into the security
infrastructure. Instead of allocating the blobs from within
the modules the modules tell the infrastructure how much
space is required, and the space is allocated there.
Acked-by: Paul Moore <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: John Johansen <[email protected]>
Acked-by: Stephen Smalley <[email protected]>
Signed-off-by: Casey Schaufler <[email protected]>
---
include/linux/lsm_hooks.h | 1 +
security/apparmor/include/net.h | 6 ++-
security/apparmor/lsm.c | 38 ++++----------
security/security.c | 36 +++++++++++++-
security/selinux/hooks.c | 82 +++++++++++++++----------------
security/selinux/include/objsec.h | 5 ++
security/selinux/netlabel.c | 23 ++++-----
security/smack/smack.h | 5 ++
security/smack/smack_lsm.c | 66 ++++++++++++-------------
security/smack/smack_netfilter.c | 4 +-
10 files changed, 145 insertions(+), 121 deletions(-)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 419b5febc3ca..14d88e1312eb 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1605,6 +1605,7 @@ struct lsm_blob_sizes {
int lbs_cred;
int lbs_file;
int lbs_inode;
+ int lbs_sock;
int lbs_superblock;
int lbs_ipc;
int lbs_msg_msg;
diff --git a/security/apparmor/include/net.h b/security/apparmor/include/net.h
index aadb4b29fb66..fac8999ba7a3 100644
--- a/security/apparmor/include/net.h
+++ b/security/apparmor/include/net.h
@@ -51,7 +51,11 @@ struct aa_sk_ctx {
struct aa_label *peer;
};
-#define SK_CTX(X) ((X)->sk_security)
+static inline struct aa_sk_ctx *aa_sock(const struct sock *sk)
+{
+ return sk->sk_security + apparmor_blob_sizes.lbs_sock;
+}
+
#define SOCK_ctx(X) SOCK_INODE(X)->i_security
#define DEFINE_AUDIT_NET(NAME, OP, SK, F, T, P) \
struct lsm_network_audit NAME ## _net = { .sk = (SK), \
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 4f0eecb67dde..be8976c407f4 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -782,33 +782,15 @@ static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo
return error;
}
-/**
- * apparmor_sk_alloc_security - allocate and attach the sk_security field
- */
-static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
-{
- struct aa_sk_ctx *ctx;
-
- ctx = kzalloc(sizeof(*ctx), flags);
- if (!ctx)
- return -ENOMEM;
-
- SK_CTX(sk) = ctx;
-
- return 0;
-}
-
/**
* apparmor_sk_free_security - free the sk_security field
*/
static void apparmor_sk_free_security(struct sock *sk)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
- SK_CTX(sk) = NULL;
aa_put_label(ctx->label);
aa_put_label(ctx->peer);
- kfree(ctx);
}
/**
@@ -817,8 +799,8 @@ static void apparmor_sk_free_security(struct sock *sk)
static void apparmor_sk_clone_security(const struct sock *sk,
struct sock *newsk)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- struct aa_sk_ctx *new = SK_CTX(newsk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
+ struct aa_sk_ctx *new = aa_sock(newsk);
if (new->label)
aa_put_label(new->label);
@@ -874,7 +856,7 @@ static int apparmor_socket_post_create(struct socket *sock, int family,
label = aa_get_current_label();
if (sock->sk) {
- struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
+ struct aa_sk_ctx *ctx = aa_sock(sock->sk);
aa_put_label(ctx->label);
ctx->label = aa_get_label(label);
@@ -1059,7 +1041,7 @@ static int apparmor_socket_shutdown(struct socket *sock, int how)
*/
static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (!skb->secmark)
return 0;
@@ -1072,7 +1054,7 @@ static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
static struct aa_label *sk_peer_label(struct sock *sk)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (ctx->peer)
return ctx->peer;
@@ -1156,7 +1138,7 @@ static int apparmor_socket_getpeersec_dgram(struct socket *sock,
*/
static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (!ctx->label)
ctx->label = aa_get_current_label();
@@ -1166,7 +1148,7 @@ static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
- struct aa_sk_ctx *ctx = SK_CTX(sk);
+ struct aa_sk_ctx *ctx = aa_sock(sk);
if (!skb->secmark)
return 0;
@@ -1183,6 +1165,7 @@ struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
.lbs_cred = sizeof(struct aa_task_ctx *),
.lbs_file = sizeof(struct aa_file_ctx),
.lbs_task = sizeof(struct aa_task_ctx),
+ .lbs_sock = sizeof(struct aa_sk_ctx),
};
static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
@@ -1219,7 +1202,6 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
- LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
@@ -1771,7 +1753,7 @@ static unsigned int apparmor_ip_postroute(void *priv,
if (sk == NULL)
return NF_ACCEPT;
- ctx = SK_CTX(sk);
+ ctx = aa_sock(sk);
if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
skb->secmark, sk))
return NF_ACCEPT;
diff --git a/security/security.c b/security/security.c
index 22543fdb6041..d956912741d5 100644
--- a/security/security.c
+++ b/security/security.c
@@ -29,6 +29,7 @@
#include <linux/string.h>
#include <linux/msg.h>
#include <net/flow.h>
+#include <net/sock.h>
#define MAX_LSM_EVM_XATTR 2
@@ -204,6 +205,7 @@ static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
+ lsm_set_blob_size(&needed->lbs_sock, &blob_sizes.lbs_sock);
lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
}
@@ -340,6 +342,7 @@ static void __init ordered_lsm_init(void)
init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
+ init_debug("sock blob size = %d\n", blob_sizes.lbs_sock);
init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
init_debug("task blob size = %d\n", blob_sizes.lbs_task);
@@ -659,6 +662,28 @@ static int lsm_msg_msg_alloc(struct msg_msg *mp)
return 0;
}
+/**
+ * lsm_sock_alloc - allocate a composite sock blob
+ * @sock: the sock that needs a blob
+ * @priority: allocation mode
+ *
+ * Allocate the sock blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+static int lsm_sock_alloc(struct sock *sock, gfp_t priority)
+{
+ if (blob_sizes.lbs_sock == 0) {
+ sock->sk_security = NULL;
+ return 0;
+ }
+
+ sock->sk_security = kzalloc(blob_sizes.lbs_sock, priority);
+ if (sock->sk_security == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
/**
* lsm_early_task - during initialization allocate a composite task blob
* @task: the task that needs a blob
@@ -2276,12 +2301,21 @@ EXPORT_SYMBOL(security_socket_getpeersec_dgram);
int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
{
- return call_int_hook(sk_alloc_security, 0, sk, family, priority);
+ int rc = lsm_sock_alloc(sk, priority);
+
+ if (unlikely(rc))
+ return rc;
+ rc = call_int_hook(sk_alloc_security, 0, sk, family, priority);
+ if (unlikely(rc))
+ security_sk_free(sk);
+ return rc;
}
void security_sk_free(struct sock *sk)
{
call_void_hook(sk_free_security, sk);
+ kfree(sk->sk_security);
+ sk->sk_security = NULL;
}
void security_sk_clone(const struct sock *sk, struct sock *newsk)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index e9e959343de9..7aca813b5826 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4535,7 +4535,7 @@ static int socket_sockcreate_sid(const struct task_security_struct *tsec,
static int sock_has_perm(struct sock *sk, u32 perms)
{
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
@@ -4592,7 +4592,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
isec->initialized = LABEL_INITIALIZED;
if (sock->sk) {
- sksec = sock->sk->sk_security;
+ sksec = selinux_sock(sock->sk);
sksec->sclass = sclass;
sksec->sid = sid;
/* Allows detection of the first association on this socket */
@@ -4608,8 +4608,8 @@ static int selinux_socket_post_create(struct socket *sock, int family,
static int selinux_socket_socketpair(struct socket *socka,
struct socket *sockb)
{
- struct sk_security_struct *sksec_a = socka->sk->sk_security;
- struct sk_security_struct *sksec_b = sockb->sk->sk_security;
+ struct sk_security_struct *sksec_a = selinux_sock(socka->sk);
+ struct sk_security_struct *sksec_b = selinux_sock(sockb->sk);
sksec_a->peer_sid = sksec_b->sid;
sksec_b->peer_sid = sksec_a->sid;
@@ -4624,7 +4624,7 @@ static int selinux_socket_socketpair(struct socket *socka,
static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
{
struct sock *sk = sock->sk;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
u16 family;
int err;
@@ -4759,7 +4759,7 @@ static int selinux_socket_connect_helper(struct socket *sock,
struct sockaddr *address, int addrlen)
{
struct sock *sk = sock->sk;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
int err;
err = sock_has_perm(sk, SOCKET__CONNECT);
@@ -4938,9 +4938,9 @@ static int selinux_socket_unix_stream_connect(struct sock *sock,
struct sock *other,
struct sock *newsk)
{
- struct sk_security_struct *sksec_sock = sock->sk_security;
- struct sk_security_struct *sksec_other = other->sk_security;
- struct sk_security_struct *sksec_new = newsk->sk_security;
+ struct sk_security_struct *sksec_sock = selinux_sock(sock);
+ struct sk_security_struct *sksec_other = selinux_sock(other);
+ struct sk_security_struct *sksec_new = selinux_sock(newsk);
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
int err;
@@ -4972,8 +4972,8 @@ static int selinux_socket_unix_stream_connect(struct sock *sock,
static int selinux_socket_unix_may_send(struct socket *sock,
struct socket *other)
{
- struct sk_security_struct *ssec = sock->sk->sk_security;
- struct sk_security_struct *osec = other->sk->sk_security;
+ struct sk_security_struct *ssec = selinux_sock(sock->sk);
+ struct sk_security_struct *osec = selinux_sock(other->sk);
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
@@ -5015,7 +5015,7 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
u16 family)
{
int err = 0;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
u32 sk_sid = sksec->sid;
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
@@ -5048,7 +5048,7 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
int err;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
u16 family = sk->sk_family;
u32 sk_sid = sksec->sid;
struct common_audit_data ad;
@@ -5116,13 +5116,15 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
return err;
}
-static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
- int __user *optlen, unsigned len)
+static int selinux_socket_getpeersec_stream(struct socket *sock,
+ char __user *optval,
+ int __user *optlen,
+ unsigned int len)
{
int err = 0;
char *scontext;
u32 scontext_len;
- struct sk_security_struct *sksec = sock->sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sock->sk);
u32 peer_sid = SECSID_NULL;
if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
@@ -5182,34 +5184,27 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
{
- struct sk_security_struct *sksec;
-
- sksec = kzalloc(sizeof(*sksec), priority);
- if (!sksec)
- return -ENOMEM;
+ struct sk_security_struct *sksec = selinux_sock(sk);
sksec->peer_sid = SECINITSID_UNLABELED;
sksec->sid = SECINITSID_UNLABELED;
sksec->sclass = SECCLASS_SOCKET;
selinux_netlbl_sk_security_reset(sksec);
- sk->sk_security = sksec;
return 0;
}
static void selinux_sk_free_security(struct sock *sk)
{
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
- sk->sk_security = NULL;
selinux_netlbl_sk_security_free(sksec);
- kfree(sksec);
}
static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
{
- struct sk_security_struct *sksec = sk->sk_security;
- struct sk_security_struct *newsksec = newsk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
+ struct sk_security_struct *newsksec = selinux_sock(newsk);
newsksec->sid = sksec->sid;
newsksec->peer_sid = sksec->peer_sid;
@@ -5223,7 +5218,7 @@ static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
if (!sk)
*secid = SECINITSID_ANY_SOCKET;
else {
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
*secid = sksec->sid;
}
@@ -5233,7 +5228,7 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
{
struct inode_security_struct *isec =
inode_security_novalidate(SOCK_INODE(parent));
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
sk->sk_family == PF_UNIX)
@@ -5250,7 +5245,7 @@ static int selinux_sctp_process_new_assoc(struct sctp_association *asoc,
{
struct sock *sk = asoc->base.sk;
u16 family = sk->sk_family;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
int err;
@@ -5308,7 +5303,7 @@ static int selinux_sctp_process_new_assoc(struct sctp_association *asoc,
static int selinux_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb)
{
- struct sk_security_struct *sksec = asoc->base.sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(asoc->base.sk);
u32 conn_sid;
int err;
@@ -5341,7 +5336,7 @@ static int selinux_sctp_assoc_request(struct sctp_association *asoc,
static int selinux_sctp_assoc_established(struct sctp_association *asoc,
struct sk_buff *skb)
{
- struct sk_security_struct *sksec = asoc->base.sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(asoc->base.sk);
if (!selinux_policycap_extsockclass())
return 0;
@@ -5440,8 +5435,8 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
static void selinux_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
struct sock *newsk)
{
- struct sk_security_struct *sksec = sk->sk_security;
- struct sk_security_struct *newsksec = newsk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
+ struct sk_security_struct *newsksec = selinux_sock(newsk);
/* If policy does not support SECCLASS_SCTP_SOCKET then call
* the non-sctp clone version.
@@ -5458,7 +5453,7 @@ static void selinux_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk
static int selinux_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
int err;
u16 family = req->rsk_ops->family;
u32 connsid;
@@ -5479,7 +5474,7 @@ static int selinux_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
static void selinux_inet_csk_clone(struct sock *newsk,
const struct request_sock *req)
{
- struct sk_security_struct *newsksec = newsk->sk_security;
+ struct sk_security_struct *newsksec = selinux_sock(newsk);
newsksec->sid = req->secid;
newsksec->peer_sid = req->peer_secid;
@@ -5496,7 +5491,7 @@ static void selinux_inet_csk_clone(struct sock *newsk,
static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
{
u16 family = sk->sk_family;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
/* handle mapped IPv4 packets arriving via IPv6 sockets */
if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
@@ -5580,7 +5575,7 @@ static int selinux_tun_dev_attach_queue(void *security)
static int selinux_tun_dev_attach(struct sock *sk, void *security)
{
struct tun_security_struct *tunsec = security;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
/* we don't currently perform any NetLabel based labeling here and it
* isn't clear that we would want to do so anyway; while we could apply
@@ -5709,7 +5704,7 @@ static unsigned int selinux_ip_output(void *priv, struct sk_buff *skb,
return NF_ACCEPT;
/* standard practice, label using the parent socket */
- sksec = sk->sk_security;
+ sksec = selinux_sock(sk);
sid = sksec->sid;
} else
sid = SECINITSID_KERNEL;
@@ -5732,7 +5727,7 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
sk = skb_to_full_sk(skb);
if (sk == NULL)
return NF_ACCEPT;
- sksec = sk->sk_security;
+ sksec = selinux_sock(sk);
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
@@ -5825,7 +5820,7 @@ static unsigned int selinux_ip_postroute(void *priv,
u32 skb_sid;
struct sk_security_struct *sksec;
- sksec = sk->sk_security;
+ sksec = selinux_sock(sk);
if (selinux_skb_peerlbl_sid(skb, family, &skb_sid))
return NF_DROP;
/* At this point, if the returned skb peerlbl is SECSID_NULL
@@ -5854,7 +5849,7 @@ static unsigned int selinux_ip_postroute(void *priv,
} else {
/* Locally generated packet, fetch the security label from the
* associated socket. */
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
peer_sid = sksec->sid;
secmark_perm = PACKET__SEND;
}
@@ -5903,7 +5898,7 @@ static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
unsigned int data_len = skb->len;
unsigned char *data = skb->data;
struct nlmsghdr *nlh;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
u16 sclass = sksec->sclass;
u32 perm;
@@ -6903,6 +6898,7 @@ struct lsm_blob_sizes selinux_blob_sizes __lsm_ro_after_init = {
.lbs_inode = sizeof(struct inode_security_struct),
.lbs_ipc = sizeof(struct ipc_security_struct),
.lbs_msg_msg = sizeof(struct msg_security_struct),
+ .lbs_sock = sizeof(struct sk_security_struct),
.lbs_superblock = sizeof(struct superblock_security_struct),
};
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 2953132408bf..007d1ae7ee27 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -194,4 +194,9 @@ static inline struct superblock_security_struct *selinux_superblock(
return superblock->s_security + selinux_blob_sizes.lbs_superblock;
}
+static inline struct sk_security_struct *selinux_sock(const struct sock *sock)
+{
+ return sock->sk_security + selinux_blob_sizes.lbs_sock;
+}
+
#endif /* _SELINUX_OBJSEC_H_ */
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 1321f15799e2..800ab4b4239e 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -17,6 +17,7 @@
#include <linux/gfp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
+#include <linux/lsm_hooks.h>
#include <net/sock.h>
#include <net/netlabel.h>
#include <net/ip.h>
@@ -68,7 +69,7 @@ static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
{
int rc;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct netlbl_lsm_secattr *secattr;
if (sksec->nlbl_secattr != NULL)
@@ -101,7 +102,7 @@ static struct netlbl_lsm_secattr *selinux_netlbl_sock_getattr(
const struct sock *sk,
u32 sid)
{
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct netlbl_lsm_secattr *secattr = sksec->nlbl_secattr;
if (secattr == NULL)
@@ -236,7 +237,7 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
* being labeled by it's parent socket, if it is just exit */
sk = skb_to_full_sk(skb);
if (sk != NULL) {
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
if (sksec->nlbl_state != NLBL_REQSKB)
return 0;
@@ -274,7 +275,7 @@ int selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
{
int rc;
struct netlbl_lsm_secattr secattr;
- struct sk_security_struct *sksec = asoc->base.sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(asoc->base.sk);
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
@@ -355,7 +356,7 @@ int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
*/
void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
{
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
if (family == PF_INET)
sksec->nlbl_state = NLBL_LABELED;
@@ -373,8 +374,8 @@ void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
*/
void selinux_netlbl_sctp_sk_clone(struct sock *sk, struct sock *newsk)
{
- struct sk_security_struct *sksec = sk->sk_security;
- struct sk_security_struct *newsksec = newsk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
+ struct sk_security_struct *newsksec = selinux_sock(newsk);
newsksec->nlbl_state = sksec->nlbl_state;
}
@@ -392,7 +393,7 @@ void selinux_netlbl_sctp_sk_clone(struct sock *sk, struct sock *newsk)
int selinux_netlbl_socket_post_create(struct sock *sk, u16 family)
{
int rc;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct netlbl_lsm_secattr *secattr;
if (family != PF_INET && family != PF_INET6)
@@ -507,7 +508,7 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
{
int rc = 0;
struct sock *sk = sock->sk;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct netlbl_lsm_secattr secattr;
if (selinux_netlbl_option(level, optname) &&
@@ -545,7 +546,7 @@ static int selinux_netlbl_socket_connect_helper(struct sock *sk,
struct sockaddr *addr)
{
int rc;
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
struct netlbl_lsm_secattr *secattr;
/* connected sockets are allowed to disconnect when the address family
@@ -584,7 +585,7 @@ static int selinux_netlbl_socket_connect_helper(struct sock *sk,
int selinux_netlbl_socket_connect_locked(struct sock *sk,
struct sockaddr *addr)
{
- struct sk_security_struct *sksec = sk->sk_security;
+ struct sk_security_struct *sksec = selinux_sock(sk);
if (sksec->nlbl_state != NLBL_REQSKB &&
sksec->nlbl_state != NLBL_CONNLABELED)
diff --git a/security/smack/smack.h b/security/smack/smack.h
index fc837dcebf96..ef9d0b7b1954 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -363,6 +363,11 @@ static inline struct superblock_smack *smack_superblock(
return superblock->s_security + smack_blob_sizes.lbs_superblock;
}
+static inline struct socket_smack *smack_sock(const struct sock *sock)
+{
+ return sock->sk_security + smack_blob_sizes.lbs_sock;
+}
+
/*
* Is the directory transmuting?
*/
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 6207762dbdb1..2689486160a2 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1434,7 +1434,7 @@ static int smack_inode_getsecurity(struct user_namespace *mnt_userns,
if (sock == NULL || sock->sk == NULL)
return -EOPNOTSUPP;
- ssp = sock->sk->sk_security;
+ ssp = smack_sock(sock->sk);
if (strcmp(name, XATTR_SMACK_IPIN) == 0)
isp = ssp->smk_in;
@@ -1817,7 +1817,7 @@ static int smack_file_receive(struct file *file)
if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
sock = SOCKET_I(inode);
- ssp = sock->sk->sk_security;
+ ssp = smack_sock(sock->sk);
tsp = smack_cred(current_cred());
/*
* If the receiving process can't write to the
@@ -2237,11 +2237,7 @@ static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
{
struct smack_known *skp = smk_of_current();
- struct socket_smack *ssp;
-
- ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
- if (ssp == NULL)
- return -ENOMEM;
+ struct socket_smack *ssp = smack_sock(sk);
/*
* Sockets created by kernel threads receive web label.
@@ -2255,11 +2251,10 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
}
ssp->smk_packet = NULL;
- sk->sk_security = ssp;
-
return 0;
}
+#ifdef SMACK_IPV6_PORT_LABELING
/**
* smack_sk_free_security - Free a socket blob
* @sk: the socket
@@ -2268,7 +2263,6 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
*/
static void smack_sk_free_security(struct sock *sk)
{
-#ifdef SMACK_IPV6_PORT_LABELING
struct smk_port_label *spp;
if (sk->sk_family == PF_INET6) {
@@ -2281,9 +2275,8 @@ static void smack_sk_free_security(struct sock *sk)
}
rcu_read_unlock();
}
-#endif
- kfree(sk->sk_security);
}
+#endif
/**
* smack_ipv4host_label - check host based restrictions
@@ -2396,7 +2389,7 @@ static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
*/
static int smack_netlbl_add(struct sock *sk)
{
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
struct smack_known *skp = ssp->smk_out;
int rc;
@@ -2428,7 +2421,7 @@ static int smack_netlbl_add(struct sock *sk)
*/
static void smack_netlbl_delete(struct sock *sk)
{
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
/*
* Take the label off the socket if one is set.
@@ -2460,7 +2453,7 @@ static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap)
struct smack_known *skp;
int rc = 0;
struct smack_known *hkp;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
struct smk_audit_info ad;
rcu_read_lock();
@@ -2533,7 +2526,7 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
{
struct sock *sk = sock->sk;
struct sockaddr_in6 *addr6;
- struct socket_smack *ssp = sock->sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sock->sk);
struct smk_port_label *spp;
unsigned short port = 0;
@@ -2621,7 +2614,7 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
int act)
{
struct smk_port_label *spp;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
struct smack_known *skp = NULL;
unsigned short port;
struct smack_known *object;
@@ -2715,7 +2708,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
if (sock == NULL || sock->sk == NULL)
return -EOPNOTSUPP;
- ssp = sock->sk->sk_security;
+ ssp = smack_sock(sock->sk);
if (strcmp(name, XATTR_SMACK_IPIN) == 0)
ssp->smk_in = skp;
@@ -2763,7 +2756,7 @@ static int smack_socket_post_create(struct socket *sock, int family,
* Sockets created by kernel threads receive web label.
*/
if (unlikely(current->flags & PF_KTHREAD)) {
- ssp = sock->sk->sk_security;
+ ssp = smack_sock(sock->sk);
ssp->smk_in = &smack_known_web;
ssp->smk_out = &smack_known_web;
}
@@ -2788,8 +2781,8 @@ static int smack_socket_post_create(struct socket *sock, int family,
static int smack_socket_socketpair(struct socket *socka,
struct socket *sockb)
{
- struct socket_smack *asp = socka->sk->sk_security;
- struct socket_smack *bsp = sockb->sk->sk_security;
+ struct socket_smack *asp = smack_sock(socka->sk);
+ struct socket_smack *bsp = smack_sock(sockb->sk);
asp->smk_packet = bsp->smk_out;
bsp->smk_packet = asp->smk_out;
@@ -2852,7 +2845,7 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
if (__is_defined(SMACK_IPV6_SECMARK_LABELING))
rsp = smack_ipv6host_label(sip);
if (rsp != NULL) {
- struct socket_smack *ssp = sock->sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sock->sk);
rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
SMK_CONNECTING);
@@ -3583,9 +3576,9 @@ static int smack_unix_stream_connect(struct sock *sock,
{
struct smack_known *skp;
struct smack_known *okp;
- struct socket_smack *ssp = sock->sk_security;
- struct socket_smack *osp = other->sk_security;
- struct socket_smack *nsp = newsk->sk_security;
+ struct socket_smack *ssp = smack_sock(sock);
+ struct socket_smack *osp = smack_sock(other);
+ struct socket_smack *nsp = smack_sock(newsk);
struct smk_audit_info ad;
int rc = 0;
#ifdef CONFIG_AUDIT
@@ -3631,8 +3624,8 @@ static int smack_unix_stream_connect(struct sock *sock,
*/
static int smack_unix_may_send(struct socket *sock, struct socket *other)
{
- struct socket_smack *ssp = sock->sk->sk_security;
- struct socket_smack *osp = other->sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sock->sk);
+ struct socket_smack *osp = smack_sock(other->sk);
struct smk_audit_info ad;
int rc;
@@ -3669,7 +3662,7 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
#endif
#ifdef SMACK_IPV6_SECMARK_LABELING
- struct socket_smack *ssp = sock->sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sock->sk);
struct smack_known *rsp;
#endif
int rc = 0;
@@ -3881,7 +3874,7 @@ static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family,
netlbl_secattr_init(&secattr);
if (sk)
- ssp = sk->sk_security;
+ ssp = smack_sock(sk);
if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) {
skp = smack_from_secattr(&secattr, ssp);
@@ -3903,7 +3896,7 @@ static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family,
*/
static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
struct smack_known *skp = NULL;
int rc = 0;
struct smk_audit_info ad;
@@ -4007,7 +4000,7 @@ static int smack_socket_getpeersec_stream(struct socket *sock,
int slen = 1;
int rc = 0;
- ssp = sock->sk->sk_security;
+ ssp = smack_sock(sock->sk);
if (ssp->smk_packet != NULL) {
rcp = ssp->smk_packet->smk_known;
slen = strlen(rcp) + 1;
@@ -4056,7 +4049,7 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
switch (family) {
case PF_UNIX:
- ssp = sock->sk->sk_security;
+ ssp = smack_sock(sock->sk);
s = ssp->smk_out->smk_secid;
break;
case PF_INET:
@@ -4105,7 +4098,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
(sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
return;
- ssp = sk->sk_security;
+ ssp = smack_sock(sk);
ssp->smk_in = skp;
ssp->smk_out = skp;
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
@@ -4125,7 +4118,7 @@ static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
{
u16 family = sk->sk_family;
struct smack_known *skp;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
struct sockaddr_in addr;
struct iphdr *hdr;
struct smack_known *hskp;
@@ -4211,7 +4204,7 @@ static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
static void smack_inet_csk_clone(struct sock *sk,
const struct request_sock *req)
{
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = smack_sock(sk);
struct smack_known *skp;
if (req->peer_secid != 0) {
@@ -4747,6 +4740,7 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
.lbs_inode = sizeof(struct inode_smack),
.lbs_ipc = sizeof(struct smack_known *),
.lbs_msg_msg = sizeof(struct smack_known *),
+ .lbs_sock = sizeof(struct socket_smack),
.lbs_superblock = sizeof(struct superblock_smack),
};
@@ -4857,7 +4851,9 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream),
LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram),
LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security),
+#ifdef SMACK_IPV6_PORT_LABELING
LSM_HOOK_INIT(sk_free_security, smack_sk_free_security),
+#endif
LSM_HOOK_INIT(sock_graft, smack_sock_graft),
LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request),
LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone),
diff --git a/security/smack/smack_netfilter.c b/security/smack/smack_netfilter.c
index b945c1d3a743..bad71b7e648d 100644
--- a/security/smack/smack_netfilter.c
+++ b/security/smack/smack_netfilter.c
@@ -26,8 +26,8 @@ static unsigned int smack_ip_output(void *priv,
struct socket_smack *ssp;
struct smack_known *skp;
- if (sk && sk->sk_security) {
- ssp = sk->sk_security;
+ if (sk) {
+ ssp = smack_sock(sk);
skp = ssp->smk_out;
skb->secmark = skp->smk_secid;
}
--
2.35.1
Netlabel uses LSM interfaces requiring an lsmblob and
the internal storage is used to pass information between
these interfaces, so change the internal data from a secid
to a lsmblob. Update the netlabel interfaces and their
callers to accommodate the change. This requires that the
modules using netlabel use the lsm_id.slot to access the
correct secid when using netlabel.
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: John Johansen <[email protected]>
Acked-by: Stephen Smalley <[email protected]>
Acked-by: Paul Moore <[email protected]>
Signed-off-by: Casey Schaufler <[email protected]>
Cc: [email protected]
---
include/net/netlabel.h | 8 +--
net/ipv4/cipso_ipv4.c | 26 ++++++----
net/netlabel/netlabel_kapi.c | 6 +--
net/netlabel/netlabel_unlabeled.c | 79 +++++++++--------------------
net/netlabel/netlabel_unlabeled.h | 2 +-
security/selinux/hooks.c | 2 +-
security/selinux/include/security.h | 1 +
security/selinux/netlabel.c | 2 +-
security/selinux/ss/services.c | 4 +-
security/smack/smack.h | 1 +
security/smack/smack_access.c | 2 +-
security/smack/smack_lsm.c | 11 ++--
security/smack/smackfs.c | 10 ++--
13 files changed, 68 insertions(+), 86 deletions(-)
diff --git a/include/net/netlabel.h b/include/net/netlabel.h
index 43ae50337685..73fc25b4042b 100644
--- a/include/net/netlabel.h
+++ b/include/net/netlabel.h
@@ -166,7 +166,7 @@ struct netlbl_lsm_catmap {
* @attr.mls: MLS sensitivity label
* @attr.mls.cat: MLS category bitmap
* @attr.mls.lvl: MLS sensitivity level
- * @attr.secid: LSM specific secid token
+ * @attr.lsmblob: LSM specific data
*
* Description:
* This structure is used to pass security attributes between NetLabel and the
@@ -201,7 +201,7 @@ struct netlbl_lsm_secattr {
struct netlbl_lsm_catmap *cat;
u32 lvl;
} mls;
- u32 secid;
+ struct lsmblob lsmblob;
} attr;
};
@@ -415,7 +415,7 @@ int netlbl_cfg_unlbl_static_add(struct net *net,
const void *addr,
const void *mask,
u16 family,
- u32 secid,
+ struct lsmblob *lsmblob,
struct netlbl_audit *audit_info);
int netlbl_cfg_unlbl_static_del(struct net *net,
const char *dev_name,
@@ -523,7 +523,7 @@ static inline int netlbl_cfg_unlbl_static_add(struct net *net,
const void *addr,
const void *mask,
u16 family,
- u32 secid,
+ struct lsmblob *lsmblob,
struct netlbl_audit *audit_info)
{
return -ENOSYS;
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 62d5f99760aa..bb9c900da6b0 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -106,15 +106,17 @@ int cipso_v4_rbm_strictvalid = 1;
/* Base length of the local tag (non-standard tag).
* Tag definition (may change between kernel versions)
*
- * 0 8 16 24 32
- * +----------+----------+----------+----------+
- * | 10000000 | 00000110 | 32-bit secid value |
- * +----------+----------+----------+----------+
- * | in (host byte order)|
- * +----------+----------+
- *
+ * 0 8 16 16 + sizeof(struct lsmblob)
+ * +----------+----------+---------------------+
+ * | 10000000 | 00000110 | LSM blob data |
+ * +----------+----------+---------------------+
+ *
+ * All secid and flag fields are in host byte order.
+ * The lsmblob structure size varies depending on which
+ * Linux security modules are built in the kernel.
+ * The data is opaque.
*/
-#define CIPSO_V4_TAG_LOC_BLEN 6
+#define CIPSO_V4_TAG_LOC_BLEN (2 + sizeof(struct lsmblob))
/*
* Helper Functions
@@ -1460,7 +1462,11 @@ static int cipso_v4_gentag_loc(const struct cipso_v4_doi *doi_def,
buffer[0] = CIPSO_V4_TAG_LOCAL;
buffer[1] = CIPSO_V4_TAG_LOC_BLEN;
- *(u32 *)&buffer[2] = secattr->attr.secid;
+ /* Ensure that there is sufficient space in the CIPSO header
+ * for the LSM data. */
+ BUILD_BUG_ON(CIPSO_V4_TAG_LOC_BLEN > CIPSO_V4_OPT_LEN_MAX);
+ memcpy(&buffer[2], &secattr->attr.lsmblob,
+ sizeof(secattr->attr.lsmblob));
return CIPSO_V4_TAG_LOC_BLEN;
}
@@ -1480,7 +1486,7 @@ static int cipso_v4_parsetag_loc(const struct cipso_v4_doi *doi_def,
const unsigned char *tag,
struct netlbl_lsm_secattr *secattr)
{
- secattr->attr.secid = *(u32 *)&tag[2];
+ memcpy(&secattr->attr.lsmblob, &tag[2], sizeof(secattr->attr.lsmblob));
secattr->flags |= NETLBL_SECATTR_SECID;
return 0;
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 54c083003947..14ebe0424811 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -196,7 +196,7 @@ int netlbl_cfg_unlbl_map_add(const char *domain,
* @addr: IP address in network byte order (struct in[6]_addr)
* @mask: address mask in network byte order (struct in[6]_addr)
* @family: address family
- * @secid: LSM secid value for the entry
+ * @lsmblob: LSM data value for the entry
* @audit_info: NetLabel audit information
*
* Description:
@@ -210,7 +210,7 @@ int netlbl_cfg_unlbl_static_add(struct net *net,
const void *addr,
const void *mask,
u16 family,
- u32 secid,
+ struct lsmblob *lsmblob,
struct netlbl_audit *audit_info)
{
u32 addr_len;
@@ -230,7 +230,7 @@ int netlbl_cfg_unlbl_static_add(struct net *net,
return netlbl_unlhsh_add(net,
dev_name, addr, mask, addr_len,
- secid, audit_info);
+ lsmblob, audit_info);
}
/**
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 12e5d508bd08..910a03f15b0d 100644
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -66,7 +66,7 @@ struct netlbl_unlhsh_tbl {
#define netlbl_unlhsh_addr4_entry(iter) \
container_of(iter, struct netlbl_unlhsh_addr4, list)
struct netlbl_unlhsh_addr4 {
- u32 secid;
+ struct lsmblob lsmblob;
struct netlbl_af4list list;
struct rcu_head rcu;
@@ -74,7 +74,7 @@ struct netlbl_unlhsh_addr4 {
#define netlbl_unlhsh_addr6_entry(iter) \
container_of(iter, struct netlbl_unlhsh_addr6, list)
struct netlbl_unlhsh_addr6 {
- u32 secid;
+ struct lsmblob lsmblob;
struct netlbl_af6list list;
struct rcu_head rcu;
@@ -220,7 +220,7 @@ static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
* @iface: the associated interface entry
* @addr: IPv4 address in network byte order
* @mask: IPv4 address mask in network byte order
- * @secid: LSM secid value for entry
+ * @lsmblob: LSM data value for entry
*
* Description:
* Add a new address entry into the unlabeled connection hash table using the
@@ -231,7 +231,7 @@ static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
const struct in_addr *addr,
const struct in_addr *mask,
- u32 secid)
+ struct lsmblob *lsmblob)
{
int ret_val;
struct netlbl_unlhsh_addr4 *entry;
@@ -243,7 +243,7 @@ static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
entry->list.addr = addr->s_addr & mask->s_addr;
entry->list.mask = mask->s_addr;
entry->list.valid = 1;
- entry->secid = secid;
+ entry->lsmblob = *lsmblob;
spin_lock(&netlbl_unlhsh_lock);
ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
@@ -260,7 +260,7 @@ static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
* @iface: the associated interface entry
* @addr: IPv6 address in network byte order
* @mask: IPv6 address mask in network byte order
- * @secid: LSM secid value for entry
+ * @lsmblob: LSM data value for entry
*
* Description:
* Add a new address entry into the unlabeled connection hash table using the
@@ -271,7 +271,7 @@ static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
const struct in6_addr *addr,
const struct in6_addr *mask,
- u32 secid)
+ struct lsmblob *lsmblob)
{
int ret_val;
struct netlbl_unlhsh_addr6 *entry;
@@ -287,7 +287,7 @@ static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
entry->list.mask = *mask;
entry->list.valid = 1;
- entry->secid = secid;
+ entry->lsmblob = *lsmblob;
spin_lock(&netlbl_unlhsh_lock);
ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
@@ -366,7 +366,7 @@ int netlbl_unlhsh_add(struct net *net,
const void *addr,
const void *mask,
u32 addr_len,
- u32 secid,
+ struct lsmblob *lsmblob,
struct netlbl_audit *audit_info)
{
int ret_val;
@@ -375,7 +375,6 @@ int netlbl_unlhsh_add(struct net *net,
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
struct lsmcontext context;
- struct lsmblob blob;
if (addr_len != sizeof(struct in_addr) &&
addr_len != sizeof(struct in6_addr))
@@ -408,7 +407,7 @@ int netlbl_unlhsh_add(struct net *net,
const struct in_addr *addr4 = addr;
const struct in_addr *mask4 = mask;
- ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
+ ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, lsmblob);
if (audit_buf != NULL)
netlbl_af4list_audit_addr(audit_buf, 1,
dev_name,
@@ -421,7 +420,7 @@ int netlbl_unlhsh_add(struct net *net,
const struct in6_addr *addr6 = addr;
const struct in6_addr *mask6 = mask;
- ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
+ ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, lsmblob);
if (audit_buf != NULL)
netlbl_af6list_audit_addr(audit_buf, 1,
dev_name,
@@ -438,11 +437,7 @@ int netlbl_unlhsh_add(struct net *net,
unlhsh_add_return:
rcu_read_unlock();
if (audit_buf != NULL) {
- /* lsmblob_init() puts secid into all of the secids in blob.
- * security_secid_to_secctx() will know which security module
- * to use to create the secctx. */
- lsmblob_init(&blob, secid);
- if (security_secid_to_secctx(&blob, &context) == 0) {
+ if (security_secid_to_secctx(lsmblob, &context) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -477,7 +472,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
@@ -496,13 +490,8 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
(dev != NULL ? dev->name : NULL),
addr->s_addr, mask->s_addr);
dev_put(dev);
- /* lsmblob_init() puts entry->secid into all of the secids
- * in blob. security_secid_to_secctx() will know which
- * security module to use to create the secctx. */
- if (entry != NULL)
- lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob, &context) == 0) {
+ security_secid_to_secctx(&entry->lsmblob, &context) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -543,7 +532,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
struct audit_buffer *audit_buf;
struct net_device *dev;
struct lsmcontext context;
- struct lsmblob blob;
spin_lock(&netlbl_unlhsh_lock);
list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
@@ -561,13 +549,8 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
(dev != NULL ? dev->name : NULL),
addr, mask);
dev_put(dev);
- /* lsmblob_init() puts entry->secid into all of the secids
- * in blob. security_secid_to_secctx() will know which
- * security module to use to create the secctx. */
- if (entry != NULL)
- lsmblob_init(&blob, entry->secid);
if (entry != NULL &&
- security_secid_to_secctx(&blob, &context) == 0) {
+ security_secid_to_secctx(&entry->lsmblob, &context) == 0) {
audit_log_format(audit_buf, " sec_obj=%s",
context.context);
security_release_secctx(&context);
@@ -921,14 +904,8 @@ static int netlbl_unlabel_staticadd(struct sk_buff *skb,
if (ret_val != 0)
return ret_val;
- /* netlbl_unlhsh_add will be changed to pass a struct lsmblob *
- * instead of a u32 later in this patch set. security_secctx_to_secid()
- * will only be setting one entry in the lsmblob struct, so it is
- * safe to use lsmblob_value() to get that one value. */
-
- return netlbl_unlhsh_add(&init_net,
- dev_name, addr, mask, addr_len,
- lsmblob_value(&blob), &audit_info);
+ return netlbl_unlhsh_add(&init_net, dev_name, addr, mask, addr_len,
+ &blob, &audit_info);
}
/**
@@ -975,11 +952,8 @@ static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
if (ret_val != 0)
return ret_val;
- /* security_secctx_to_secid() will only put one secid into the lsmblob
- * so it's safe to use lsmblob_value() to get the secid. */
- return netlbl_unlhsh_add(&init_net,
- NULL, addr, mask, addr_len,
- lsmblob_value(&blob), &audit_info);
+ return netlbl_unlhsh_add(&init_net, NULL, addr, mask, addr_len, &blob,
+ &audit_info);
}
/**
@@ -1091,8 +1065,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
struct net_device *dev;
struct lsmcontext context;
void *data;
- u32 secid;
- struct lsmblob blob;
+ struct lsmblob *lsmb;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
cb_arg->seq, &netlbl_unlabel_gnl_family,
@@ -1130,7 +1103,7 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
if (ret_val != 0)
goto list_cb_failure;
- secid = addr4->secid;
+ lsmb = (struct lsmblob *)&addr4->lsmblob;
} else {
ret_val = nla_put_in6_addr(cb_arg->skb,
NLBL_UNLABEL_A_IPV6ADDR,
@@ -1144,14 +1117,10 @@ static int netlbl_unlabel_staticlist_gen(u32 cmd,
if (ret_val != 0)
goto list_cb_failure;
- secid = addr6->secid;
+ lsmb = (struct lsmblob *)&addr6->lsmblob;
}
- /* lsmblob_init() secid into all of the secids in blob.
- * security_secid_to_secctx() will know which security module
- * to use to create the secctx. */
- lsmblob_init(&blob, secid);
- ret_val = security_secid_to_secctx(&blob, &context);
+ ret_val = security_secid_to_secctx(lsmb, &context);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
@@ -1510,7 +1479,7 @@ int netlbl_unlabel_getattr(const struct sk_buff *skb,
&iface->addr4_list);
if (addr4 == NULL)
goto unlabel_getattr_nolabel;
- secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid;
+ secattr->attr.lsmblob = netlbl_unlhsh_addr4_entry(addr4)->lsmblob;
break;
}
#if IS_ENABLED(CONFIG_IPV6)
@@ -1523,7 +1492,7 @@ int netlbl_unlabel_getattr(const struct sk_buff *skb,
&iface->addr6_list);
if (addr6 == NULL)
goto unlabel_getattr_nolabel;
- secattr->attr.secid = netlbl_unlhsh_addr6_entry(addr6)->secid;
+ secattr->attr.lsmblob = netlbl_unlhsh_addr6_entry(addr6)->lsmblob;
break;
}
#endif /* IPv6 */
diff --git a/net/netlabel/netlabel_unlabeled.h b/net/netlabel/netlabel_unlabeled.h
index 058e3a285d56..168920780994 100644
--- a/net/netlabel/netlabel_unlabeled.h
+++ b/net/netlabel/netlabel_unlabeled.h
@@ -211,7 +211,7 @@ int netlbl_unlhsh_add(struct net *net,
const void *addr,
const void *mask,
u32 addr_len,
- u32 secid,
+ struct lsmblob *lsmblob,
struct netlbl_audit *audit_info);
int netlbl_unlhsh_remove(struct net *net,
const char *dev_name,
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3098a6459b68..653dd2e236f1 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7003,7 +7003,7 @@ static int selinux_uring_sqpoll(void)
}
#endif /* CONFIG_IO_URING */
-static struct lsm_id selinux_lsmid __lsm_ro_after_init = {
+struct lsm_id selinux_lsmid __lsm_ro_after_init = {
.lsm = "selinux",
.slot = LSMBLOB_NEEDED
};
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index ace4bd13e808..f60cd964da62 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -73,6 +73,7 @@
struct netlbl_lsm_secattr;
extern int selinux_enabled_boot;
+extern struct lsm_id selinux_lsmid;
/*
* type_datum properties
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 800ab4b4239e..0b8f99703462 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -109,7 +109,7 @@ static struct netlbl_lsm_secattr *selinux_netlbl_sock_getattr(
return NULL;
if ((secattr->flags & NETLBL_SECATTR_SECID) &&
- (secattr->attr.secid == sid))
+ (secattr->attr.lsmblob.secid[selinux_lsmid.slot] == sid))
return secattr;
return NULL;
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 6901dc07680d..fac287237495 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -3897,7 +3897,7 @@ int security_netlbl_secattr_to_sid(struct selinux_state *state,
if (secattr->flags & NETLBL_SECATTR_CACHE)
*sid = *(u32 *)secattr->cache->data;
else if (secattr->flags & NETLBL_SECATTR_SECID)
- *sid = secattr->attr.secid;
+ *sid = secattr->attr.lsmblob.secid[selinux_lsmid.slot];
else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
rc = -EIDRM;
ctx = sidtab_search(sidtab, SECINITSID_NETMSG);
@@ -3975,7 +3975,7 @@ int security_netlbl_sid_to_secattr(struct selinux_state *state,
if (secattr->domain == NULL)
goto out;
- secattr->attr.secid = sid;
+ secattr->attr.lsmblob.secid[selinux_lsmid.slot] = sid;
secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
mls_export_netlbl_lvl(policydb, ctx, secattr);
rc = mls_export_netlbl_cat(policydb, ctx, secattr);
diff --git a/security/smack/smack.h b/security/smack/smack.h
index ef9d0b7b1954..ac79313ea95d 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -303,6 +303,7 @@ int smack_populate_secattr(struct smack_known *skp);
* Shared data.
*/
extern int smack_enabled __initdata;
+extern struct lsm_id smack_lsmid;
extern int smack_cipso_direct;
extern int smack_cipso_mapped;
extern struct smack_known *smack_net_ambient;
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index d2186e2757be..c6dcafe18912 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -524,7 +524,7 @@ int smack_populate_secattr(struct smack_known *skp)
{
int slen;
- skp->smk_netlabel.attr.secid = skp->smk_secid;
+ skp->smk_netlabel.attr.lsmblob.secid[smack_lsmid.slot] = skp->smk_secid;
skp->smk_netlabel.domain = skp->smk_known;
skp->smk_netlabel.cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
if (skp->smk_netlabel.cache != NULL) {
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 552c4d4d8fac..2190c03ae3d0 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3728,11 +3728,12 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
if ((sap->flags & NETLBL_SECATTR_CACHE) != 0)
return (struct smack_known *)sap->cache->data;
+ /*
+ * Looks like a fallback, which gives us a secid.
+ */
if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
- /*
- * Looks like a fallback, which gives us a secid.
- */
- return smack_from_secid(sap->attr.secid);
+ return smack_from_secid(
+ sap->attr.lsmblob.secid[smack_lsmid.slot]);
if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
/*
@@ -4751,7 +4752,7 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
.lbs_superblock = sizeof(struct superblock_smack),
};
-static struct lsm_id smack_lsmid __lsm_ro_after_init = {
+struct lsm_id smack_lsmid __lsm_ro_after_init = {
.lsm = "smack",
.slot = LSMBLOB_NEEDED
};
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 658eab05599e..13c2fa728054 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -1143,6 +1143,7 @@ static void smk_net4addr_insert(struct smk_net4addr *new)
static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
+ struct lsmblob lsmblob;
struct smk_net4addr *snp;
struct sockaddr_in newname;
char *smack;
@@ -1274,10 +1275,13 @@ static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
* this host so that incoming packets get labeled.
* but only if we didn't get the special CIPSO option
*/
- if (rc == 0 && skp != NULL)
+ if (rc == 0 && skp != NULL) {
+ lsmblob_init(&lsmblob, 0);
+ lsmblob.secid[smack_lsmid.slot] = snp->smk_label->smk_secid;
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
- &snp->smk_host, &snp->smk_mask, PF_INET,
- snp->smk_label->smk_secid, &audit_info);
+ &snp->smk_host, &snp->smk_mask, PF_INET, &lsmblob,
+ &audit_info);
+ }
if (rc == 0)
rc = count;
--
2.35.1
Create a new entry "interface_lsm" in the procfs attr directory for
controlling which LSM security information is displayed for a
process. A process can only read or write its own display value.
The name of an active LSM that supplies hooks for
human readable data may be written to "interface_lsm" to set the
value. The name of the LSM currently in use can be read from
"interface_lsm". At this point there can only be one LSM capable
of display active. A helper function lsm_task_ilsm() is
provided to get the interface lsm slot for a task_struct.
Setting the "interface_lsm" requires that all security modules using
setprocattr hooks allow the action. Each security module is
responsible for defining its policy.
AppArmor hook provided by John Johansen <[email protected]>
SELinux hook provided by Stephen Smalley <[email protected]>
Signed-off-by: Casey Schaufler <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: John Johansen <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
.../ABI/testing/procfs-attr-lsm_display | 22 +++
Documentation/security/lsm.rst | 14 ++
fs/proc/base.c | 1 +
include/linux/security.h | 17 ++
security/apparmor/include/apparmor.h | 3 +-
security/apparmor/lsm.c | 32 ++++
security/security.c | 166 ++++++++++++++++--
security/selinux/hooks.c | 11 ++
security/selinux/include/classmap.h | 3 +-
security/smack/smack_lsm.c | 7 +
10 files changed, 257 insertions(+), 19 deletions(-)
create mode 100644 Documentation/ABI/testing/procfs-attr-lsm_display
diff --git a/Documentation/ABI/testing/procfs-attr-lsm_display b/Documentation/ABI/testing/procfs-attr-lsm_display
new file mode 100644
index 000000000000..0f60005c235c
--- /dev/null
+++ b/Documentation/ABI/testing/procfs-attr-lsm_display
@@ -0,0 +1,22 @@
+What: /proc/*/attr/lsm_display
+Contact: [email protected],
+Description: The name of the Linux security module (LSM) that will
+ provide information in the /proc/*/attr/current,
+ /proc/*/attr/prev and /proc/*/attr/exec interfaces.
+ The details of permissions required to read from
+ this interface are dependent on the LSMs active on the
+ system.
+ A process cannot write to this interface unless it
+ refers to itself.
+ The other details of permissions required to write to
+ this interface are dependent on the LSMs active on the
+ system.
+ The format of the data used by this interface is a
+ text string identifying the name of an LSM. The values
+ accepted are:
+ selinux - the SELinux LSM
+ smack - the Smack LSM
+ apparmor - The AppArmor LSM
+ By convention the LSM names are lower case and do not
+ contain special characters.
+Users: LSM user-space
diff --git a/Documentation/security/lsm.rst b/Documentation/security/lsm.rst
index 6a2a2e973080..b77b4a540391 100644
--- a/Documentation/security/lsm.rst
+++ b/Documentation/security/lsm.rst
@@ -129,3 +129,17 @@ to identify it as the first security module to be registered.
The capabilities security module does not use the general security
blobs, unlike other modules. The reasons are historical and are
based on overhead, complexity and performance concerns.
+
+LSM External Interfaces
+=======================
+
+The LSM infrastructure does not generally provide external interfaces.
+The individual security modules provide what external interfaces they
+require.
+
+The file ``/sys/kernel/security/lsm`` provides a comma
+separated list of the active security modules.
+
+The file ``/proc/pid/attr/interface_lsm`` contains the name of the security
+module for which the ``/proc/pid/attr/current`` interface will
+apply. This interface can be written to.
diff --git a/fs/proc/base.c b/fs/proc/base.c
index c1031843cc6a..f2d15348bdff 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2827,6 +2827,7 @@ static const struct pid_entry attr_dir_stuff[] = {
ATTR(NULL, "fscreate", 0666),
ATTR(NULL, "keycreate", 0666),
ATTR(NULL, "sockcreate", 0666),
+ ATTR(NULL, "interface_lsm", 0666),
#ifdef CONFIG_SECURITY_SMACK
DIR("smack", 0555,
proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
diff --git a/include/linux/security.h b/include/linux/security.h
index fa413a5a2ccb..a6574d13c6fb 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -238,6 +238,23 @@ static inline u32 lsmblob_first(const struct lsmblob *blob)
#endif
}
+/**
+ * lsm_task_ilsm - the "interface_lsm" for this task
+ * @task: The task to report on
+ *
+ * Returns the task's interface LSM slot.
+ */
+static inline int lsm_task_ilsm(struct task_struct *task)
+{
+#ifdef CONFIG_SECURITY
+ int *ilsm = task->security;
+
+ if (ilsm)
+ return *ilsm;
+#endif
+ return LSMBLOB_INVALID;
+}
+
/* These functions are in security/commoncap.c */
extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
int cap, unsigned int opts);
diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h
index 1fbabdb565a8..b1622fcb4394 100644
--- a/security/apparmor/include/apparmor.h
+++ b/security/apparmor/include/apparmor.h
@@ -28,8 +28,9 @@
#define AA_CLASS_SIGNAL 10
#define AA_CLASS_NET 14
#define AA_CLASS_LABEL 16
+#define AA_CLASS_DISPLAY_LSM 17
-#define AA_CLASS_LAST AA_CLASS_LABEL
+#define AA_CLASS_LAST AA_CLASS_DISPLAY_LSM
/* Control parameters settable through module/boot flags */
extern enum audit_mode aa_g_audit;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 1e53fea61335..29181bc8c693 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -621,6 +621,25 @@ static int apparmor_getprocattr(struct task_struct *task, char *name,
return error;
}
+
+static int profile_interface_lsm(struct aa_profile *profile,
+ struct common_audit_data *sa)
+{
+ struct aa_perms perms = { };
+ unsigned int state;
+
+ state = PROFILE_MEDIATES(profile, AA_CLASS_DISPLAY_LSM);
+ if (state) {
+ aa_compute_perms(profile->policy.dfa, state, &perms);
+ aa_apply_modes_to_perms(profile, &perms);
+ aad(sa)->label = &profile->label;
+
+ return aa_check_perms(profile, &perms, AA_MAY_WRITE, sa, NULL);
+ }
+
+ return 0;
+}
+
static int apparmor_setprocattr(const char *name, void *value,
size_t size)
{
@@ -632,6 +651,19 @@ static int apparmor_setprocattr(const char *name, void *value,
if (size == 0)
return -EINVAL;
+ /* LSM infrastructure does actual setting of interface_lsm if allowed */
+ if (!strcmp(name, "interface_lsm")) {
+ struct aa_profile *profile;
+ struct aa_label *label;
+
+ aad(&sa)->info = "set interface lsm";
+ label = begin_current_label_crit_section();
+ error = fn_for_each_confined(label, profile,
+ profile_interface_lsm(profile, &sa));
+ end_current_label_crit_section(label);
+ return error;
+ }
+
/* AppArmor requires that the buffer must be null terminated atm */
if (args[size - 1] != '\0') {
/* null terminate */
diff --git a/security/security.c b/security/security.c
index 2ad0d4eb24b3..ec4d1b3026d8 100644
--- a/security/security.c
+++ b/security/security.c
@@ -78,7 +78,16 @@ static struct kmem_cache *lsm_file_cache;
static struct kmem_cache *lsm_inode_cache;
char *lsm_names;
-static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init;
+
+/*
+ * The task blob includes the "interface_lsm" slot used for
+ * chosing which module presents contexts.
+ * Using a long to avoid potential alignment issues with
+ * module assigned task blobs.
+ */
+static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init = {
+ .lbs_task = sizeof(long),
+};
/* Boot-time LSM user choice */
static __initdata const char *chosen_lsm_order;
@@ -672,6 +681,8 @@ int lsm_inode_alloc(struct inode *inode)
*/
static int lsm_task_alloc(struct task_struct *task)
{
+ int *ilsm;
+
if (blob_sizes.lbs_task == 0) {
task->security = NULL;
return 0;
@@ -680,6 +691,15 @@ static int lsm_task_alloc(struct task_struct *task)
task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
if (task->security == NULL)
return -ENOMEM;
+
+ /*
+ * The start of the task blob contains the "interface" LSM slot number.
+ * Start with it set to the invalid slot number, indicating that the
+ * default first registered LSM be displayed.
+ */
+ ilsm = task->security;
+ *ilsm = LSMBLOB_INVALID;
+
return 0;
}
@@ -1752,14 +1772,26 @@ int security_file_open(struct file *file)
int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
{
+ int *oilsm = current->security;
+ int *nilsm;
int rc = lsm_task_alloc(task);
- if (rc)
+ if (unlikely(rc))
return rc;
+
rc = call_int_hook(task_alloc, 0, task, clone_flags);
- if (unlikely(rc))
+ if (unlikely(rc)) {
security_task_free(task);
- return rc;
+ return rc;
+ }
+
+ if (oilsm) {
+ nilsm = task->security;
+ if (nilsm)
+ *nilsm = *oilsm;
+ }
+
+ return 0;
}
void security_task_free(struct task_struct *task)
@@ -2191,23 +2223,110 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
char **value)
{
struct security_hook_list *hp;
+ int ilsm = lsm_task_ilsm(current);
+ int slot = 0;
+
+ if (!strcmp(name, "interface_lsm")) {
+ /*
+ * lsm_slot will be 0 if there are no displaying modules.
+ */
+ if (lsm_slot == 0)
+ return -EINVAL;
+
+ /*
+ * Only allow getting the current process' interface_lsm.
+ * There are too few reasons to get another process'
+ * interface_lsm and too many LSM policy issues.
+ */
+ if (current != p)
+ return -EINVAL;
+
+ ilsm = lsm_task_ilsm(p);
+ if (ilsm != LSMBLOB_INVALID)
+ slot = ilsm;
+ *value = kstrdup(lsm_slotlist[slot]->lsm, GFP_KERNEL);
+ if (*value)
+ return strlen(*value);
+ return -ENOMEM;
+ }
hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
continue;
+ if (lsm == NULL && ilsm != LSMBLOB_INVALID &&
+ ilsm != hp->lsmid->slot)
+ continue;
return hp->hook.getprocattr(p, name, value);
}
return LSM_RET_DEFAULT(getprocattr);
}
+/**
+ * security_setprocattr - Set process attributes via /proc
+ * @lsm: name of module involved, or NULL
+ * @name: name of the attribute
+ * @value: value to set the attribute to
+ * @size: size of the value
+ *
+ * Set the process attribute for the specified security module
+ * to the specified value. Note that this can only be used to set
+ * the process attributes for the current, or "self" process.
+ * The /proc code has already done this check.
+ *
+ * Returns 0 on success, an appropriate code otherwise.
+ */
int security_setprocattr(const char *lsm, const char *name, void *value,
size_t size)
{
struct security_hook_list *hp;
+ char *termed;
+ char *copy;
+ int *ilsm = current->security;
+ int rc = -EINVAL;
+ int slot = 0;
+
+ if (!strcmp(name, "interface_lsm")) {
+ /*
+ * Change the "interface_lsm" value only if all the security
+ * modules that support setting a procattr allow it.
+ * It is assumed that all such security modules will be
+ * cooperative.
+ */
+ if (size == 0)
+ return -EINVAL;
+
+ hlist_for_each_entry(hp, &security_hook_heads.setprocattr,
+ list) {
+ rc = hp->hook.setprocattr(name, value, size);
+ if (rc < 0 && rc != LSM_RET_DEFAULT(setprocattr))
+ return rc;
+ }
+
+ rc = -EINVAL;
+
+ copy = kmemdup_nul(value, size, GFP_KERNEL);
+ if (copy == NULL)
+ return -ENOMEM;
+
+ termed = strsep(©, " \n");
+
+ for (slot = 0; slot < lsm_slot; slot++)
+ if (!strcmp(termed, lsm_slotlist[slot]->lsm)) {
+ *ilsm = lsm_slotlist[slot]->slot;
+ rc = size;
+ break;
+ }
+
+ kfree(termed);
+ return rc;
+ }
hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
continue;
+ if (lsm == NULL && *ilsm != LSMBLOB_INVALID &&
+ *ilsm != hp->lsmid->slot)
+ continue;
return hp->hook.setprocattr(name, value, size);
}
return LSM_RET_DEFAULT(setprocattr);
@@ -2227,15 +2346,15 @@ EXPORT_SYMBOL(security_ismaclabel);
int security_secid_to_secctx(struct lsmblob *blob, char **secdata, u32 *seclen)
{
struct security_hook_list *hp;
- int rc;
+ int ilsm = lsm_task_ilsm(current);
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- rc = hp->hook.secid_to_secctx(blob->secid[hp->lsmid->slot],
- secdata, seclen);
- if (rc != LSM_RET_DEFAULT(secid_to_secctx))
- return rc;
+ if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot)
+ return hp->hook.secid_to_secctx(
+ blob->secid[hp->lsmid->slot],
+ secdata, seclen);
}
return LSM_RET_DEFAULT(secid_to_secctx);
@@ -2246,16 +2365,15 @@ int security_secctx_to_secid(const char *secdata, u32 seclen,
struct lsmblob *blob)
{
struct security_hook_list *hp;
- int rc;
+ int ilsm = lsm_task_ilsm(current);
lsmblob_init(blob, 0);
hlist_for_each_entry(hp, &security_hook_heads.secctx_to_secid, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- rc = hp->hook.secctx_to_secid(secdata, seclen,
- &blob->secid[hp->lsmid->slot]);
- if (rc != 0)
- return rc;
+ if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot)
+ return hp->hook.secctx_to_secid(secdata, seclen,
+ &blob->secid[hp->lsmid->slot]);
}
return 0;
}
@@ -2263,7 +2381,14 @@ EXPORT_SYMBOL(security_secctx_to_secid);
void security_release_secctx(char *secdata, u32 seclen)
{
- call_void_hook(release_secctx, secdata, seclen);
+ struct security_hook_list *hp;
+ int ilsm = lsm_task_ilsm(current);
+
+ hlist_for_each_entry(hp, &security_hook_heads.release_secctx, list)
+ if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot) {
+ hp->hook.release_secctx(secdata, seclen);
+ return;
+ }
}
EXPORT_SYMBOL(security_release_secctx);
@@ -2404,8 +2529,15 @@ EXPORT_SYMBOL(security_sock_rcv_skb);
int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
int __user *optlen, unsigned len)
{
- return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
- optval, optlen, len);
+ int ilsm = lsm_task_ilsm(current);
+ struct security_hook_list *hp;
+
+ hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_stream,
+ list)
+ if (ilsm == LSMBLOB_INVALID || ilsm == hp->lsmid->slot)
+ return hp->hook.socket_getpeersec_stream(sock, optval,
+ optlen, len);
+ return -ENOPROTOOPT;
}
int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 429309d8a910..3098a6459b68 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -6388,6 +6388,17 @@ static int selinux_setprocattr(const char *name, void *value, size_t size)
/*
* Basic control over ability to set these attributes at all.
*/
+
+ /*
+ * For setting interface_lsm, we only perform a permission check;
+ * the actual update to the interface_lsm value is handled by the
+ * LSM framework.
+ */
+ if (!strcmp(name, "interface_lsm"))
+ return avc_has_perm(&selinux_state,
+ mysid, mysid, SECCLASS_PROCESS2,
+ PROCESS2__SETINTERFACE_LSM, NULL);
+
if (!strcmp(name, "exec"))
error = avc_has_perm(&selinux_state,
mysid, mysid, SECCLASS_PROCESS,
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index 35aac62a662e..79b480983bdc 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -53,7 +53,8 @@ struct security_class_mapping secclass_map[] = {
"execmem", "execstack", "execheap", "setkeycreate",
"setsockcreate", "getrlimit", NULL } },
{ "process2",
- { "nnp_transition", "nosuid_transition", NULL } },
+ { "nnp_transition", "nosuid_transition", "setinterface_lsm",
+ NULL } },
{ "system",
{ "ipc_info", "syslog_read", "syslog_mod",
"syslog_console", "module_request", "module_load", NULL } },
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 6e0eaecd8256..552c4d4d8fac 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3516,6 +3516,13 @@ static int smack_setprocattr(const char *name, void *value, size_t size)
struct smack_known_list_elem *sklep;
int rc;
+ /*
+ * Allow the /proc/.../attr/current and SO_PEERSEC "interface_lsm"
+ * to be reset at will.
+ */
+ if (strcmp(name, "interface_lsm") == 0)
+ return 0;
+
if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel))
return -EPERM;
--
2.35.1
On Mon, Apr 18, 2022 at 11:12 AM Casey Schaufler <[email protected]> wrote:
>
> Add a new boolean function lsm_multiple_contexts() to
> identify when multiple security modules provide security
> context strings.
>
> Signed-off-by: Casey Schaufler <[email protected]>
> ---
> include/linux/security.h | 9 +++++++++
> 1 file changed, 9 insertions(+)
Acked-by: Paul Moore <[email protected]>
--
paul-moore.com
On 4/18/22 07:59, Casey Schaufler wrote:
> Change the secid parameter of security_audit_rule_match
> to a lsmblob structure pointer. Pass the entry from the
> lsmblob structure for the approprite slot to the LSM hook.
>
> Change the users of security_audit_rule_match to use the
> lsmblob instead of a u32. The scaffolding function lsmblob_init()
> fills the blob with the value of the old secid, ensuring that
> it is available to the appropriate module hook. The sources of
> the secid, security_task_getsecid() and security_inode_getsecid(),
> will be converted to use the blob structure later in the series.
> At the point the use of lsmblob_init() is dropped.
>
> Signed-off-by: Casey Schaufler <[email protected]>
> Acked-by: Paul Moore <[email protected]>
Reviewed-by: John Johansen <[email protected]>
> Cc: [email protected]
> ---
> include/linux/security.h | 5 +++--
> kernel/auditfilter.c | 6 ++++--
> kernel/auditsc.c | 16 +++++++++++-----
> security/security.c | 5 +++--
> 4 files changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 3666eddad59a..ee5d14dac65f 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -1955,7 +1955,7 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer)
> int security_audit_rule_init(u32 field, u32 op, char *rulestr,
> struct audit_lsm_rules *lsmrules);
> int security_audit_rule_known(struct audit_krule *krule);
> -int security_audit_rule_match(u32 secid, u32 field, u32 op,
> +int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
> struct audit_lsm_rules *lsmrules);
> void security_audit_rule_free(struct audit_lsm_rules *lsmrules);
>
> @@ -1972,7 +1972,8 @@ static inline int security_audit_rule_known(struct audit_krule *krule)
> return 0;
> }
>
> -static inline int security_audit_rule_match(u32 secid, u32 field, u32 op,
> +static inline int security_audit_rule_match(struct lsmblob *blob,
> + u32 field, u32 op,
> struct audit_lsm_rules *lsmrules)
> {
> return 0;
> diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
> index de75bd6ad866..15cd4fe35e9c 100644
> --- a/kernel/auditfilter.c
> +++ b/kernel/auditfilter.c
> @@ -1337,6 +1337,7 @@ int audit_filter(int msgtype, unsigned int listtype)
>
> for (i = 0; i < e->rule.field_count; i++) {
> struct audit_field *f = &e->rule.fields[i];
> + struct lsmblob blob;
> pid_t pid;
> u32 sid;
>
> @@ -1369,8 +1370,9 @@ int audit_filter(int msgtype, unsigned int listtype)
> case AUDIT_SUBJ_CLR:
> if (f->lsm_str) {
> security_current_getsecid_subj(&sid);
> - result = security_audit_rule_match(sid,
> - f->type, f->op,
> + lsmblob_init(&blob, sid);
> + result = security_audit_rule_match(
> + &blob, f->type, f->op,
> &f->lsm_rules);
> }
> break;
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index d272b5cf18a8..a9d5bfa37cb3 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -468,6 +468,7 @@ static int audit_filter_rules(struct task_struct *tsk,
> const struct cred *cred;
> int i, need_sid = 1;
> u32 sid;
> + struct lsmblob blob;
> unsigned int sessionid;
>
> if (ctx && rule->prio <= ctx->prio)
> @@ -678,8 +679,10 @@ static int audit_filter_rules(struct task_struct *tsk,
> security_current_getsecid_subj(&sid);
> need_sid = 0;
> }
> - result = security_audit_rule_match(sid, f->type,
> - f->op, &f->lsm_rules);
> + lsmblob_init(&blob, sid);
> + result = security_audit_rule_match(&blob,
> + f->type, f->op,
> + &f->lsm_rules);
> }
> break;
> case AUDIT_OBJ_USER:
> @@ -692,15 +695,17 @@ static int audit_filter_rules(struct task_struct *tsk,
> if (f->lsm_str) {
> /* Find files that match */
> if (name) {
> + lsmblob_init(&blob, name->osid);
> result = security_audit_rule_match(
> - name->osid,
> + &blob,
> f->type,
> f->op,
> &f->lsm_rules);
> } else if (ctx) {
> list_for_each_entry(n, &ctx->names_list, list) {
> + lsmblob_init(&blob, n->osid);
> if (security_audit_rule_match(
> - n->osid, f->type, f->op,
> + &blob, f->type, f->op,
> &f->lsm_rules)) {
> ++result;
> break;
> @@ -710,7 +715,8 @@ static int audit_filter_rules(struct task_struct *tsk,
> /* Find ipc objects that match */
> if (!ctx || ctx->type != AUDIT_IPC)
> break;
> - if (security_audit_rule_match(ctx->ipc.osid,
> + lsmblob_init(&blob, ctx->ipc.osid);
> + if (security_audit_rule_match(&blob,
> f->type, f->op,
> &f->lsm_rules))
> ++result;
> diff --git a/security/security.c b/security/security.c
> index 9e0139b0d346..ced1c76a380f 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -2703,7 +2703,7 @@ void security_audit_rule_free(struct audit_lsm_rules *lsmrules)
> }
> }
>
> -int security_audit_rule_match(u32 secid, u32 field, u32 op,
> +int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
> struct audit_lsm_rules *lsmrules)
> {
> struct security_hook_list *hp;
> @@ -2714,7 +2714,8 @@ int security_audit_rule_match(u32 secid, u32 field, u32 op,
> continue;
> if (lsmrules->rule[hp->lsmid->slot] == NULL)
> continue;
> - rc = hp->hook.audit_rule_match(secid, field, op,
> + rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot],
> + field, op,
> &lsmrules->rule[hp->lsmid->slot]);
> if (rc)
> return rc;
On 4/18/22 07:59, Casey Schaufler wrote:
> Add a new boolean function lsm_multiple_contexts() to
> identify when multiple security modules provide security
> context strings.
>
> Signed-off-by: Casey Schaufler <[email protected]>
Reviewed-by: John Johansen <[email protected]>
> ---
> include/linux/security.h | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 2150016492be..3fab84220f88 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -232,6 +232,15 @@ static inline bool lsmblob_equal(const struct lsmblob *bloba,
> extern int lsm_name_to_slot(char *name);
> extern const char *lsm_slot_to_name(int slot);
>
> +static inline bool lsm_multiple_contexts(void)
> +{
> +#ifdef CONFIG_SECURITY
> + return lsm_slot_to_name(1) != NULL;
> +#else
> + return false;
> +#endif
> +}
> +
> /**
> * lsmblob_value - find the first non-zero value in an lsmblob structure.
> * @blob: Pointer to the data
On 4/18/22 07:59, Casey Schaufler wrote:
> Replace the osid field in the audit_names structure
> with a lsmblob structure. This accomodates the use
> of an lsmblob in security_audit_rule_match() and
> security_inode_getsecid().
>
> Signed-off-by: Casey Schaufler <[email protected]>
> Acked-by: Paul Moore <[email protected]>
> ---
> kernel/audit.h | 2 +-
> kernel/auditsc.c | 22 ++++++++--------------
> 2 files changed, 9 insertions(+), 15 deletions(-)
>
> diff --git a/kernel/audit.h b/kernel/audit.h
> index 316fac62d5f7..4af63e7dde17 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -82,7 +82,7 @@ struct audit_names {
> kuid_t uid;
> kgid_t gid;
> dev_t rdev;
> - u32 osid;
> + struct lsmblob lsmblob;
> struct audit_cap_data fcap;
> unsigned int fcap_ver;
> unsigned char type; /* record type */
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 231631f61550..6fe9f2525fc1 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -700,17 +700,16 @@ static int audit_filter_rules(struct task_struct *tsk,
> * lsmblob, which happens later in
> * this patch set.
> */
> - lsmblob_init(&blob, name->osid);
> result = security_audit_rule_match(
> - &blob,
> + &name->lsmblob,
> f->type,
> f->op,
> &f->lsm_rules);
> } else if (ctx) {
> list_for_each_entry(n, &ctx->names_list, list) {
> - lsmblob_init(&blob, n->osid);
> if (security_audit_rule_match(
> - &blob, f->type, f->op,
> + &n->lsmblob,
> + f->type, f->op,
> &f->lsm_rules)) {
> ++result;
> break;
> @@ -1589,13 +1588,12 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
> from_kgid(&init_user_ns, n->gid),
> MAJOR(n->rdev),
> MINOR(n->rdev));
> - if (n->osid != 0) {
> - struct lsmblob blob;
> + if (lsmblob_is_set(&n->lsmblob)) {
> struct lsmcontext lsmctx;
>
> - lsmblob_init(&blob, n->osid);
> - if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) {
> - audit_log_format(ab, " osid=%u", n->osid);
> + if (security_secid_to_secctx(&n->lsmblob, &lsmctx,
> + LSMBLOB_FIRST)) {
> + audit_log_format(ab, " osid=?");
is there something better we can do here? This feels like a regression
> if (call_panic)
> *call_panic = 2;
> } else {
> @@ -2297,17 +2295,13 @@ static void audit_copy_inode(struct audit_names *name,
> const struct dentry *dentry,
> struct inode *inode, unsigned int flags)
> {
> - struct lsmblob blob;
> -
> name->ino = inode->i_ino;
> name->dev = inode->i_sb->s_dev;
> name->mode = inode->i_mode;
> name->uid = inode->i_uid;
> name->gid = inode->i_gid;
> name->rdev = inode->i_rdev;
> - security_inode_getsecid(inode, &blob);
> - /* scaffolding until osid is updated */
> - name->osid = lsmblob_first(&blob);
> + security_inode_getsecid(inode, &name->lsmblob);
> if (flags & AUDIT_INODE_NOEVAL) {
> name->fcap_ver = -1;
> return;
On 4/18/22 07:59, Casey Schaufler wrote:
> Replace the timestamp and serial number pair used in audit records
> with a structure containing the two elements.
>
> Signed-off-by: Casey Schaufler <[email protected]>
> Acked-by: Paul Moore <[email protected]>
> ---
> kernel/audit.c | 17 +++++++++--------
> kernel/audit.h | 12 +++++++++---
> kernel/auditsc.c | 22 +++++++++-------------
> 3 files changed, 27 insertions(+), 24 deletions(-)
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> index 28ff7a5f90bd..6b6c089512f7 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -1822,11 +1822,11 @@ unsigned int audit_serial(void)
> }
>
> static inline void audit_get_stamp(struct audit_context *ctx,
> - struct timespec64 *t, unsigned int *serial)
> + struct audit_stamp *stamp)
> {
> - if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
> - ktime_get_coarse_real_ts64(t);
> - *serial = audit_serial();
> + if (!ctx || !auditsc_get_stamp(ctx, stamp)) {
> + ktime_get_coarse_real_ts64(&stamp->ctime);
> + stamp->serial = audit_serial();
> }
> }
>
> @@ -1849,8 +1849,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
> int type)
> {
> struct audit_buffer *ab;
> - struct timespec64 t;
> - unsigned int serial;
> + struct audit_stamp stamp;
>
> if (audit_initialized != AUDIT_INITIALIZED)
> return NULL;
> @@ -1905,12 +1904,14 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
> return NULL;
> }
>
> - audit_get_stamp(ab->ctx, &t, &serial);
> + audit_get_stamp(ab->ctx, &stamp);
> /* cancel dummy context to enable supporting records */
> if (ctx)
> ctx->dummy = 0;
> audit_log_format(ab, "audit(%llu.%03lu:%u): ",
> - (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial);
> + (unsigned long long)stamp.ctime.tv_sec,
> + stamp.ctime.tv_nsec/1000000,
> + stamp.serial);
>
> return ab;
> }
> diff --git a/kernel/audit.h b/kernel/audit.h
> index 4af63e7dde17..260dab6e0e15 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -99,6 +99,12 @@ struct audit_proctitle {
> char *value; /* the cmdline field */
> };
>
> +/* A timestamp/serial pair to identify an event */
> +struct audit_stamp {
> + struct timespec64 ctime; /* time of syscall entry */
> + unsigned int serial; /* serial number for record */
> +};
> +
> /* The per-task audit context. */
> struct audit_context {
> int dummy; /* must be the first element */
> @@ -108,10 +114,10 @@ struct audit_context {
> AUDIT_CTX_URING, /* in use by io_uring */
> } context;
> enum audit_state state, current_state;
> + struct audit_stamp stamp; /* event identifier */
> unsigned int serial; /* serial number for record */
shouldn't we be dropping serial from the audit_context, since we have
moved it into the audit_stamp?
> int major; /* syscall number */
> int uring_op; /* uring operation */
> - struct timespec64 ctime; /* time of syscall entry */
> unsigned long argv[4]; /* syscall arguments */
> long return_code;/* syscall return code */
> u64 prio;
> @@ -265,7 +271,7 @@ extern void audit_put_tty(struct tty_struct *tty);
> #ifdef CONFIG_AUDITSYSCALL
> extern unsigned int audit_serial(void);
> extern int auditsc_get_stamp(struct audit_context *ctx,
> - struct timespec64 *t, unsigned int *serial);
> + struct audit_stamp *stamp);
>
> extern void audit_put_watch(struct audit_watch *watch);
> extern void audit_get_watch(struct audit_watch *watch);
> @@ -306,7 +312,7 @@ extern void audit_filter_inodes(struct task_struct *tsk,
> struct audit_context *ctx);
> extern struct list_head *audit_killed_trees(void);
> #else /* CONFIG_AUDITSYSCALL */
> -#define auditsc_get_stamp(c, t, s) 0
> +#define auditsc_get_stamp(c, s) 0
> #define audit_put_watch(w) do { } while (0)
> #define audit_get_watch(w) do { } while (0)
> #define audit_to_watch(k, p, l, o) (-EINVAL)
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 6fe9f2525fc1..557713954a69 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -992,10 +992,10 @@ static void audit_reset_context(struct audit_context *ctx)
> */
>
> ctx->current_state = ctx->state;
> - ctx->serial = 0;
> + ctx->stamp.serial = 0;
> ctx->major = 0;
> ctx->uring_op = 0;
> - ctx->ctime = (struct timespec64){ .tv_sec = 0, .tv_nsec = 0 };
> + ctx->stamp.ctime = (struct timespec64){ .tv_sec = 0, .tv_nsec = 0 };
> memset(ctx->argv, 0, sizeof(ctx->argv));
> ctx->return_code = 0;
> ctx->prio = (ctx->state == AUDIT_STATE_RECORD ? ~0ULL : 0);
> @@ -1950,7 +1950,7 @@ void __audit_uring_entry(u8 op)
>
> ctx->context = AUDIT_CTX_URING;
> ctx->current_state = ctx->state;
> - ktime_get_coarse_real_ts64(&ctx->ctime);
> + ktime_get_coarse_real_ts64(&ctx->stamp.ctime);
> }
>
> /**
> @@ -2066,7 +2066,7 @@ void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
> context->argv[3] = a4;
> context->context = AUDIT_CTX_SYSCALL;
> context->current_state = state;
> - ktime_get_coarse_real_ts64(&context->ctime);
> + ktime_get_coarse_real_ts64(&context->stamp.ctime);
> }
>
> /**
> @@ -2535,21 +2535,17 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
> /**
> * auditsc_get_stamp - get local copies of audit_context values
> * @ctx: audit_context for the task
> - * @t: timespec64 to store time recorded in the audit_context
> - * @serial: serial value that is recorded in the audit_context
> + * @stamp: timestamp to record
> *
> * Also sets the context as auditable.
> */
> -int auditsc_get_stamp(struct audit_context *ctx,
> - struct timespec64 *t, unsigned int *serial)
> +int auditsc_get_stamp(struct audit_context *ctx, struct audit_stamp *stamp)
> {
> if (ctx->context == AUDIT_CTX_UNUSED)
> return 0;
> - if (!ctx->serial)
> - ctx->serial = audit_serial();
> - t->tv_sec = ctx->ctime.tv_sec;
> - t->tv_nsec = ctx->ctime.tv_nsec;
> - *serial = ctx->serial;
> + if (!ctx->stamp.serial)
> + ctx->stamp.serial = audit_serial();
> + *stamp = ctx->stamp;
> if (!ctx->prio) {
> ctx->prio = 1;
> ctx->current_state = AUDIT_STATE_RECORD;
On Mon, Apr 25, 2022 at 7:31 PM John Johansen
<[email protected]> wrote:
> On 4/18/22 07:59, Casey Schaufler wrote:
> > Replace the timestamp and serial number pair used in audit records
> > with a structure containing the two elements.
> >
> > Signed-off-by: Casey Schaufler <[email protected]>
> > Acked-by: Paul Moore <[email protected]>
> > ---
> > kernel/audit.c | 17 +++++++++--------
> > kernel/audit.h | 12 +++++++++---
> > kernel/auditsc.c | 22 +++++++++-------------
> > 3 files changed, 27 insertions(+), 24 deletions(-)
...
> > diff --git a/kernel/audit.h b/kernel/audit.h
> > index 4af63e7dde17..260dab6e0e15 100644
> > --- a/kernel/audit.h
> > +++ b/kernel/audit.h
> > @@ -108,10 +114,10 @@ struct audit_context {
> > AUDIT_CTX_URING, /* in use by io_uring */
> > } context;
> > enum audit_state state, current_state;
> > + struct audit_stamp stamp; /* event identifier */
> > unsigned int serial; /* serial number for record */
>
> shouldn't we be dropping serial from the audit_context, since we have
> moved it into the audit_stamp?
Unless we make some significant changes to audit_log_start() we still
need to preserve a timestamp in the audit_context so that regularly
associated audit records can share a common timestamp (which is what
groups multiple records into a single "event").
FWIW, I'm working on some patches which will make a lot of this better
in the future, but they aren't ready yet and would almost surely land
after the stacking patches. Audit will get better at some point in
the future, I promise :)
--
paul-moore.com
On 4/26/22 11:03, Paul Moore wrote:
> On Mon, Apr 25, 2022 at 7:31 PM John Johansen
> <[email protected]> wrote:
>> On 4/18/22 07:59, Casey Schaufler wrote:
>>> Replace the timestamp and serial number pair used in audit records
>>> with a structure containing the two elements.
>>>
>>> Signed-off-by: Casey Schaufler <[email protected]>
>>> Acked-by: Paul Moore <[email protected]>
>>> ---
>>> kernel/audit.c | 17 +++++++++--------
>>> kernel/audit.h | 12 +++++++++---
>>> kernel/auditsc.c | 22 +++++++++-------------
>>> 3 files changed, 27 insertions(+), 24 deletions(-)
>
> ...
>
>>> diff --git a/kernel/audit.h b/kernel/audit.h
>>> index 4af63e7dde17..260dab6e0e15 100644
>>> --- a/kernel/audit.h
>>> +++ b/kernel/audit.h
>>> @@ -108,10 +114,10 @@ struct audit_context {
>>> AUDIT_CTX_URING, /* in use by io_uring */
>>> } context;
>>> enum audit_state state, current_state;
>>> + struct audit_stamp stamp; /* event identifier */
>>> unsigned int serial; /* serial number for record */
>>
>> shouldn't we be dropping serial from the audit_context, since we have
>> moved it into the audit_stamp?
>
> Unless we make some significant changes to audit_log_start() we still
> need to preserve a timestamp in the audit_context so that regularly
> associated audit records can share a common timestamp (which is what
> groups multiple records into a single "event").
>
sure, but the patch changes things to use ctx->stamp.serial instead of
ctx->serial. Eg. in audit_reset_context() we have
- ctx->serial = 0;
+ ctx->stamp.serial = 0;
I don't see a reason why we need both ctx->serial and ctx->stamp.serial
On Tue, Apr 26, 2022 at 2:58 PM John Johansen
<[email protected]> wrote:
> On 4/26/22 11:03, Paul Moore wrote:
> > On Mon, Apr 25, 2022 at 7:31 PM John Johansen
> > <[email protected]> wrote:
> >> On 4/18/22 07:59, Casey Schaufler wrote:
> >>> Replace the timestamp and serial number pair used in audit records
> >>> with a structure containing the two elements.
> >>>
> >>> Signed-off-by: Casey Schaufler <[email protected]>
> >>> Acked-by: Paul Moore <[email protected]>
> >>> ---
> >>> kernel/audit.c | 17 +++++++++--------
> >>> kernel/audit.h | 12 +++++++++---
> >>> kernel/auditsc.c | 22 +++++++++-------------
> >>> 3 files changed, 27 insertions(+), 24 deletions(-)
> >
> > ...
> >
> >>> diff --git a/kernel/audit.h b/kernel/audit.h
> >>> index 4af63e7dde17..260dab6e0e15 100644
> >>> --- a/kernel/audit.h
> >>> +++ b/kernel/audit.h
> >>> @@ -108,10 +114,10 @@ struct audit_context {
> >>> AUDIT_CTX_URING, /* in use by io_uring */
> >>> } context;
> >>> enum audit_state state, current_state;
> >>> + struct audit_stamp stamp; /* event identifier */
> >>> unsigned int serial; /* serial number for record */
> >>
> >> shouldn't we be dropping serial from the audit_context, since we have
> >> moved it into the audit_stamp?
> >
> > Unless we make some significant changes to audit_log_start() we still
> > need to preserve a timestamp in the audit_context so that regularly
> > associated audit records can share a common timestamp (which is what
> > groups multiple records into a single "event").
> >
> sure, but the patch changes things to use ctx->stamp.serial instead of
> ctx->serial ...
My apologies, I read your original comment wrong; I was thinking you
were suggesting removing the timestamp info from audit_context in
favor of using the timestamp info contained in the audit_buffer.
Yes, audit_context:serial is no longer needed with audit_context:stamp.
--
paul-moore.com
On Mon, Apr 25, 2022 at 7:32 PM John Johansen
<[email protected]> wrote:
> On 4/18/22 07:59, Casey Schaufler wrote:
> > Replace the osid field in the audit_names structure
> > with a lsmblob structure. This accomodates the use
> > of an lsmblob in security_audit_rule_match() and
> > security_inode_getsecid().
> >
> > Signed-off-by: Casey Schaufler <[email protected]>
> > Acked-by: Paul Moore <[email protected]>
> > ---
> > kernel/audit.h | 2 +-
> > kernel/auditsc.c | 22 ++++++++--------------
> > 2 files changed, 9 insertions(+), 15 deletions(-)
...
> > diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> > index 231631f61550..6fe9f2525fc1 100644
> > --- a/kernel/auditsc.c
> > +++ b/kernel/auditsc.c
> > @@ -700,17 +700,16 @@ static int audit_filter_rules(struct task_struct *tsk,
> > * lsmblob, which happens later in
> > * this patch set.
> > */
> > - lsmblob_init(&blob, name->osid);
> > result = security_audit_rule_match(
> > - &blob,
> > + &name->lsmblob,
> > f->type,
> > f->op,
> > &f->lsm_rules);
> > } else if (ctx) {
> > list_for_each_entry(n, &ctx->names_list, list) {
> > - lsmblob_init(&blob, n->osid);
> > if (security_audit_rule_match(
> > - &blob, f->type, f->op,
> > + &n->lsmblob,
> > + f->type, f->op,
> > &f->lsm_rules)) {
> > ++result;
> > break;
> > @@ -1589,13 +1588,12 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
> > from_kgid(&init_user_ns, n->gid),
> > MAJOR(n->rdev),
> > MINOR(n->rdev));
> > - if (n->osid != 0) {
> > - struct lsmblob blob;
> > + if (lsmblob_is_set(&n->lsmblob)) {
> > struct lsmcontext lsmctx;
> >
> > - lsmblob_init(&blob, n->osid);
> > - if (security_secid_to_secctx(&blob, &lsmctx, LSMBLOB_FIRST)) {
> > - audit_log_format(ab, " osid=%u", n->osid);
> > + if (security_secid_to_secctx(&n->lsmblob, &lsmctx,
> > + LSMBLOB_FIRST)) {
> > + audit_log_format(ab, " osid=?");
>
> is there something better we can do here? This feels like a regression
Unfortunately no, or at least nothing has been suggested that is an
improvement on this approach. We could overload the existing field,
but that runs the risk of confusing userspace tooling and potentially
bumping into the buffer limit in some more complex configurations.
The "?" value was chosen as it is a commonly accepted way for the
audit subsystem to indicate that a value is "missing" and in the case
of new/updated userspace tooling this would be an indication to look
for the new record type which provides all of the necessary LSM
labels. In the case of old/unaware userspace tooling it would serve
as a graceful indicator that something is awry, i.e. you are using new
kernel functionality without updating your userspace.
--
paul-moore.com
On 4/26/2022 12:18 PM, Paul Moore wrote:
> On Tue, Apr 26, 2022 at 2:58 PM John Johansen
> <[email protected]> wrote:
>> On 4/26/22 11:03, Paul Moore wrote:
>>> On Mon, Apr 25, 2022 at 7:31 PM John Johansen
>>> <[email protected]> wrote:
>>>> On 4/18/22 07:59, Casey Schaufler wrote:
>>>>> Replace the timestamp and serial number pair used in audit records
>>>>> with a structure containing the two elements.
>>>>>
>>>>> Signed-off-by: Casey Schaufler <[email protected]>
>>>>> Acked-by: Paul Moore <[email protected]>
>>>>> ---
>>>>> kernel/audit.c | 17 +++++++++--------
>>>>> kernel/audit.h | 12 +++++++++---
>>>>> kernel/auditsc.c | 22 +++++++++-------------
>>>>> 3 files changed, 27 insertions(+), 24 deletions(-)
>>> ...
>>>
>>>>> diff --git a/kernel/audit.h b/kernel/audit.h
>>>>> index 4af63e7dde17..260dab6e0e15 100644
>>>>> --- a/kernel/audit.h
>>>>> +++ b/kernel/audit.h
>>>>> @@ -108,10 +114,10 @@ struct audit_context {
>>>>> AUDIT_CTX_URING, /* in use by io_uring */
>>>>> } context;
>>>>> enum audit_state state, current_state;
>>>>> + struct audit_stamp stamp; /* event identifier */
>>>>> unsigned int serial; /* serial number for record */
>>>> shouldn't we be dropping serial from the audit_context, since we have
>>>> moved it into the audit_stamp?
>>> Unless we make some significant changes to audit_log_start() we still
>>> need to preserve a timestamp in the audit_context so that regularly
>>> associated audit records can share a common timestamp (which is what
>>> groups multiple records into a single "event").
>>>
>> sure, but the patch changes things to use ctx->stamp.serial instead of
>> ctx->serial ...
> My apologies, I read your original comment wrong; I was thinking you
> were suggesting removing the timestamp info from audit_context in
> favor of using the timestamp info contained in the audit_buffer.
>
> Yes, audit_context:serial is no longer needed with audit_context:stamp.
Thank you for catching that. Easy (I expect) fix.
BTW, I'm not supposed to be working the next few weeks,
but I should be able to sneak v36 in before the next merge
window.
On Wed, Apr 27, 2022 at 11:49 AM Casey Schaufler <[email protected]> wrote:
>
> On 4/26/2022 12:18 PM, Paul Moore wrote:
> > On Tue, Apr 26, 2022 at 2:58 PM John Johansen
> > <[email protected]> wrote:
> >> On 4/26/22 11:03, Paul Moore wrote:
> >>> On Mon, Apr 25, 2022 at 7:31 PM John Johansen
> >>> <[email protected]> wrote:
> >>>> On 4/18/22 07:59, Casey Schaufler wrote:
> >>>>> Replace the timestamp and serial number pair used in audit records
> >>>>> with a structure containing the two elements.
> >>>>>
> >>>>> Signed-off-by: Casey Schaufler <[email protected]>
> >>>>> Acked-by: Paul Moore <[email protected]>
> >>>>> ---
> >>>>> kernel/audit.c | 17 +++++++++--------
> >>>>> kernel/audit.h | 12 +++++++++---
> >>>>> kernel/auditsc.c | 22 +++++++++-------------
> >>>>> 3 files changed, 27 insertions(+), 24 deletions(-)
> >>> ...
> >>>
> >>>>> diff --git a/kernel/audit.h b/kernel/audit.h
> >>>>> index 4af63e7dde17..260dab6e0e15 100644
> >>>>> --- a/kernel/audit.h
> >>>>> +++ b/kernel/audit.h
> >>>>> @@ -108,10 +114,10 @@ struct audit_context {
> >>>>> AUDIT_CTX_URING, /* in use by io_uring */
> >>>>> } context;
> >>>>> enum audit_state state, current_state;
> >>>>> + struct audit_stamp stamp; /* event identifier */
> >>>>> unsigned int serial; /* serial number for record */
> >>>> shouldn't we be dropping serial from the audit_context, since we have
> >>>> moved it into the audit_stamp?
> >>> Unless we make some significant changes to audit_log_start() we still
> >>> need to preserve a timestamp in the audit_context so that regularly
> >>> associated audit records can share a common timestamp (which is what
> >>> groups multiple records into a single "event").
> >>>
> >> sure, but the patch changes things to use ctx->stamp.serial instead of
> >> ctx->serial ...
> > My apologies, I read your original comment wrong; I was thinking you
> > were suggesting removing the timestamp info from audit_context in
> > favor of using the timestamp info contained in the audit_buffer.
> >
> > Yes, audit_context:serial is no longer needed with audit_context:stamp.
>
> Thank you for catching that. Easy (I expect) fix.
> BTW, I'm not supposed to be working the next few weeks,
> but I should be able to sneak v36 in before the next merge
> window.
Enjoy the time away :)
FWIW, this isn't my call to make, but I would strongly prefer if this
got a *full* run in linux-next before it was merged into Linus' tree
during the merge window. For example, get this into the LSM -next
tree at -rc1 instead of -rc6.
--
paul-moore.com
On 4/27/2022 9:02 AM, Paul Moore wrote:
> On Wed, Apr 27, 2022 at 11:49 AM Casey Schaufler <[email protected]> wrote:
>> On 4/26/2022 12:18 PM, Paul Moore wrote:
>>> On Tue, Apr 26, 2022 at 2:58 PM John Johansen
>>> <[email protected]> wrote:
>>>> On 4/26/22 11:03, Paul Moore wrote:
>>>>> On Mon, Apr 25, 2022 at 7:31 PM John Johansen
>>>>> <[email protected]> wrote:
>>>>>> On 4/18/22 07:59, Casey Schaufler wrote:
>>>>>>> Replace the timestamp and serial number pair used in audit records
>>>>>>> with a structure containing the two elements.
>>>>>>>
>>>>>>> Signed-off-by: Casey Schaufler <[email protected]>
>>>>>>> Acked-by: Paul Moore <[email protected]>
>>>>>>> ---
>>>>>>> kernel/audit.c | 17 +++++++++--------
>>>>>>> kernel/audit.h | 12 +++++++++---
>>>>>>> kernel/auditsc.c | 22 +++++++++-------------
>>>>>>> 3 files changed, 27 insertions(+), 24 deletions(-)
>>>>> ...
>>>>>
>>>>>>> diff --git a/kernel/audit.h b/kernel/audit.h
>>>>>>> index 4af63e7dde17..260dab6e0e15 100644
>>>>>>> --- a/kernel/audit.h
>>>>>>> +++ b/kernel/audit.h
>>>>>>> @@ -108,10 +114,10 @@ struct audit_context {
>>>>>>> AUDIT_CTX_URING, /* in use by io_uring */
>>>>>>> } context;
>>>>>>> enum audit_state state, current_state;
>>>>>>> + struct audit_stamp stamp; /* event identifier */
>>>>>>> unsigned int serial; /* serial number for record */
>>>>>> shouldn't we be dropping serial from the audit_context, since we have
>>>>>> moved it into the audit_stamp?
>>>>> Unless we make some significant changes to audit_log_start() we still
>>>>> need to preserve a timestamp in the audit_context so that regularly
>>>>> associated audit records can share a common timestamp (which is what
>>>>> groups multiple records into a single "event").
>>>>>
>>>> sure, but the patch changes things to use ctx->stamp.serial instead of
>>>> ctx->serial ...
>>> My apologies, I read your original comment wrong; I was thinking you
>>> were suggesting removing the timestamp info from audit_context in
>>> favor of using the timestamp info contained in the audit_buffer.
>>>
>>> Yes, audit_context:serial is no longer needed with audit_context:stamp.
>> Thank you for catching that. Easy (I expect) fix.
>> BTW, I'm not supposed to be working the next few weeks,
>> but I should be able to sneak v36 in before the next merge
>> window.
> Enjoy the time away :)
>
> FWIW, this isn't my call to make, but I would strongly prefer if this
> got a *full* run in linux-next before it was merged into Linus' tree
> during the merge window. For example, get this into the LSM -next
> tree at -rc1 instead of -rc6.
I am in complete agreement. There's too much Murphy to rush it.