Fixed an inconsistent use of GFP flags in nft_obj_notify() that used
GFP_KERNEL when a GFP flag was passed in to that function. Given this
allocated memory was then used in audit_log_nfcfg() it led to an audit
of all other GFP allocations in net/netfilter/nf_tables_api.c and a
modification of audit_log_nfcfg() to accept a GFP parameter.
Reported-by: Dan Carptenter <[email protected]>
Signed-off-by: Richard Guy Briggs <[email protected]>
---
Passes audit-testsuite.
include/linux/audit.h | 8 ++++----
kernel/auditsc.c | 4 ++--
net/bridge/netfilter/ebtables.c | 6 +++---
net/netfilter/nf_tables_api.c | 33 +++++++++++++++++++++------------
net/netfilter/x_tables.c | 5 +++--
5 files changed, 33 insertions(+), 23 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 604ede630580..d93739f7a35a 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -404,7 +404,7 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
extern void __audit_tk_injoffset(struct timespec64 offset);
extern void __audit_ntp_log(const struct audit_ntp_data *ad);
extern void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
- enum audit_nfcfgop op);
+ enum audit_nfcfgop op, gfp_t gfp);
static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
@@ -542,10 +542,10 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
static inline void audit_log_nfcfg(const char *name, u8 af,
unsigned int nentries,
- enum audit_nfcfgop op)
+ enum audit_nfcfgop op, gfp_t gfp)
{
if (audit_enabled)
- __audit_log_nfcfg(name, af, nentries, op);
+ __audit_log_nfcfg(name, af, nentries, op, gfp);
}
extern int audit_n_rules;
@@ -683,7 +683,7 @@ static inline void audit_ptrace(struct task_struct *t)
static inline void audit_log_nfcfg(const char *name, u8 af,
unsigned int nentries,
- enum audit_nfcfgop op)
+ enum audit_nfcfgop op, gfp_t gfp)
{ }
#define audit_n_rules 0
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3a9100e95fda..eae1a599ffe3 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2572,12 +2572,12 @@ void __audit_ntp_log(const struct audit_ntp_data *ad)
}
void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
- enum audit_nfcfgop op)
+ enum audit_nfcfgop op, gfp_t gfp)
{
struct audit_buffer *ab;
char comm[sizeof(current->comm)];
- ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_NETFILTER_CFG);
+ ab = audit_log_start(audit_context(), gfp, AUDIT_NETFILTER_CFG);
if (!ab)
return;
audit_log_format(ab, "table=%s family=%u entries=%u op=%s",
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index c83ffe912163..b13b49b9f75c 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1047,7 +1047,7 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl,
vfree(counterstmp);
audit_log_nfcfg(repl->name, AF_BRIDGE, repl->nentries,
- AUDIT_XT_OP_REPLACE);
+ AUDIT_XT_OP_REPLACE, GFP_KERNEL);
return ret;
free_unlock:
@@ -1123,7 +1123,7 @@ static void __ebt_unregister_table(struct net *net, struct ebt_table *table)
list_del(&table->list);
mutex_unlock(&ebt_mutex);
audit_log_nfcfg(table->name, AF_BRIDGE, table->private->nentries,
- AUDIT_XT_OP_UNREGISTER);
+ AUDIT_XT_OP_UNREGISTER, GFP_KERNEL);
EBT_ENTRY_ITERATE(table->private->entries, table->private->entries_size,
ebt_cleanup_entry, net, NULL);
if (table->private->nentries)
@@ -1218,7 +1218,7 @@ int ebt_register_table(struct net *net, const struct ebt_table *input_table,
}
audit_log_nfcfg(repl->name, AF_BRIDGE, repl->nentries,
- AUDIT_XT_OP_REGISTER);
+ AUDIT_XT_OP_REGISTER, GFP_KERNEL);
return ret;
free_unlock:
mutex_unlock(&ebt_mutex);
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 164700273947..f7ff91479647 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -702,7 +702,8 @@ static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
ctx->table->use,
event == NFT_MSG_NEWTABLE ?
AUDIT_NFT_OP_TABLE_REGISTER :
- AUDIT_NFT_OP_TABLE_UNREGISTER);
+ AUDIT_NFT_OP_TABLE_UNREGISTER,
+ GFP_KERNEL);
kfree(buf);
if (!ctx->report &&
@@ -1448,7 +1449,8 @@ static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
ctx->chain->use,
event == NFT_MSG_NEWCHAIN ?
AUDIT_NFT_OP_CHAIN_REGISTER :
- AUDIT_NFT_OP_CHAIN_UNREGISTER);
+ AUDIT_NFT_OP_CHAIN_UNREGISTER,
+ GFP_KERNEL);
kfree(buf);
if (!ctx->report &&
@@ -2724,7 +2726,8 @@ static void nf_tables_rule_notify(const struct nft_ctx *ctx,
rule->handle,
event == NFT_MSG_NEWRULE ?
AUDIT_NFT_OP_RULE_REGISTER :
- AUDIT_NFT_OP_RULE_UNREGISTER);
+ AUDIT_NFT_OP_RULE_UNREGISTER,
+ GFP_KERNEL);
kfree(buf);
if (!ctx->report &&
@@ -3737,7 +3740,8 @@ static void nf_tables_set_notify(const struct nft_ctx *ctx,
set->field_count,
event == NFT_MSG_NEWSET ?
AUDIT_NFT_OP_SET_REGISTER :
- AUDIT_NFT_OP_SET_UNREGISTER);
+ AUDIT_NFT_OP_SET_UNREGISTER,
+ gfp_flags);
kfree(buf);
if (!ctx->report &&
@@ -4864,7 +4868,8 @@ static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
set->handle,
event == NFT_MSG_NEWSETELEM ?
AUDIT_NFT_OP_SETELEM_REGISTER :
- AUDIT_NFT_OP_SETELEM_UNREGISTER);
+ AUDIT_NFT_OP_SETELEM_UNREGISTER,
+ GFP_KERNEL);
kfree(buf);
if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
@@ -5956,7 +5961,8 @@ static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
audit_log_nfcfg(buf,
family,
obj->handle,
- AUDIT_NFT_OP_OBJ_RESET);
+ AUDIT_NFT_OP_OBJ_RESET,
+ GFP_KERNEL);
kfree(buf);
}
@@ -6071,13 +6077,14 @@ static int nf_tables_getobj(struct net *net, struct sock *nlsk,
reset = true;
if (reset) {
- char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
+ char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
table->name, table->handle);
audit_log_nfcfg(buf,
family,
obj->handle,
- AUDIT_NFT_OP_OBJ_RESET);
+ AUDIT_NFT_OP_OBJ_RESET,
+ GFP_KERNEL);
kfree(buf);
}
@@ -6156,7 +6163,7 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
{
struct sk_buff *skb;
int err;
- char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
+ char *buf = kasprintf(gfp, "%s:%llu;?:0",
table->name, table->handle);
audit_log_nfcfg(buf,
@@ -6164,7 +6171,8 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
obj->handle,
event == NFT_MSG_NEWOBJ ?
AUDIT_NFT_OP_OBJ_REGISTER :
- AUDIT_NFT_OP_OBJ_UNREGISTER);
+ AUDIT_NFT_OP_OBJ_UNREGISTER,
+ GFP_KERNEL);
kfree(buf);
if (!report &&
@@ -6954,7 +6962,8 @@ static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
flowtable->hooknum,
event == NFT_MSG_NEWFLOWTABLE ?
AUDIT_NFT_OP_FLOWTABLE_REGISTER :
- AUDIT_NFT_OP_FLOWTABLE_UNREGISTER);
+ AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
+ GFP_KERNEL);
kfree(buf);
if (ctx->report &&
@@ -7078,7 +7087,7 @@ static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
int err;
audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
- AUDIT_NFT_OP_GEN_REGISTER);
+ AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
if (nlmsg_report(nlh) &&
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 99a468be4a59..9ad8f3ff66f5 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1410,7 +1410,8 @@ struct xt_table_info *
audit_log_nfcfg(table->name, table->af, private->number,
!private->number ? AUDIT_XT_OP_REGISTER :
- AUDIT_XT_OP_REPLACE);
+ AUDIT_XT_OP_REPLACE,
+ GFP_KERNEL);
return private;
}
EXPORT_SYMBOL_GPL(xt_replace_table);
@@ -1473,7 +1474,7 @@ void *xt_unregister_table(struct xt_table *table)
list_del(&table->list);
mutex_unlock(&xt[table->af].mutex);
audit_log_nfcfg(table->name, table->af, private->number,
- AUDIT_XT_OP_UNREGISTER);
+ AUDIT_XT_OP_UNREGISTER, GFP_KERNEL);
kfree(table);
return private;
--
1.8.3.1
On Sat, Jun 27, 2020 at 11:25 PM Richard Guy Briggs <[email protected]> wrote:
>
> Fixed an inconsistent use of GFP flags in nft_obj_notify() that used
> GFP_KERNEL when a GFP flag was passed in to that function. Given this
> allocated memory was then used in audit_log_nfcfg() it led to an audit
> of all other GFP allocations in net/netfilter/nf_tables_api.c and a
> modification of audit_log_nfcfg() to accept a GFP parameter.
>
> Reported-by: Dan Carptenter <[email protected]>
> Signed-off-by: Richard Guy Briggs <[email protected]>
> ---
> Passes audit-testsuite.
>
> include/linux/audit.h | 8 ++++----
> kernel/auditsc.c | 4 ++--
> net/bridge/netfilter/ebtables.c | 6 +++---
> net/netfilter/nf_tables_api.c | 33 +++++++++++++++++++++------------
> net/netfilter/x_tables.c | 5 +++--
> 5 files changed, 33 insertions(+), 23 deletions(-)
Merged into audit/next.
--
paul moore
http://www.paul-moore.com
Doesn't seem entirely consistent now either though. Two cases below.
/Jones
On Sun, Jun 28, 2020 at 5:27 AM Richard Guy Briggs <[email protected]> wrote:
>
> Fixed an inconsistent use of GFP flags in nft_obj_notify() that used
> GFP_KERNEL when a GFP flag was passed in to that function. Given this
> allocated memory was then used in audit_log_nfcfg() it led to an audit
> of all other GFP allocations in net/netfilter/nf_tables_api.c and a
> modification of audit_log_nfcfg() to accept a GFP parameter.
>
> Reported-by: Dan Carptenter <[email protected]>
> Signed-off-by: Richard Guy Briggs <[email protected]>
> ---
> Passes audit-testsuite.
>
> include/linux/audit.h | 8 ++++----
> kernel/auditsc.c | 4 ++--
> net/bridge/netfilter/ebtables.c | 6 +++---
> net/netfilter/nf_tables_api.c | 33 +++++++++++++++++++++------------
> net/netfilter/x_tables.c | 5 +++--
> 5 files changed, 33 insertions(+), 23 deletions(-)
>
...
> diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> index 164700273947..f7ff91479647 100644
> --- a/net/netfilter/nf_tables_api.c
> +++ b/net/netfilter/nf_tables_api.c
...
> @@ -6071,13 +6077,14 @@ static int nf_tables_getobj(struct net *net, struct sock *nlsk,
> reset = true;
>
> if (reset) {
> - char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
> + char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
> table->name, table->handle);
>
> audit_log_nfcfg(buf,
> family,
> obj->handle,
> - AUDIT_NFT_OP_OBJ_RESET);
> + AUDIT_NFT_OP_OBJ_RESET,
> + GFP_KERNEL);
> kfree(buf);
> }
>
Replaces one GFP_KERNEL (with GFP_ATOMIC) but also adds a new one in
the following statement.
Is that intentional?
> @@ -6156,7 +6163,7 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
> {
> struct sk_buff *skb;
> int err;
> - char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
> + char *buf = kasprintf(gfp, "%s:%llu;?:0",
> table->name, table->handle);
>
> audit_log_nfcfg(buf,
> @@ -6164,7 +6171,8 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
> obj->handle,
> event == NFT_MSG_NEWOBJ ?
> AUDIT_NFT_OP_OBJ_REGISTER :
> - AUDIT_NFT_OP_OBJ_UNREGISTER);
> + AUDIT_NFT_OP_OBJ_UNREGISTER,
> + GFP_KERNEL);
> kfree(buf);
>
> if (!report &&
It would seem these two hunks form a similar discrepancy.
...
> --
> 1.8.3.1
>
On Fri, Jul 3, 2020 at 8:41 AM Jones Desougi
<[email protected]> wrote:
>
> Doesn't seem entirely consistent now either though. Two cases below.
Yes, you're right, that patch was incorrect; thanks for catching that.
I just posted a fix (lore link below) that fixes the two problems you
pointed out as well as converts a call in a RCU protected section to
an ATOMIC.
https://lore.kernel.org/linux-audit/159378341669.5956.13490174029711421419.stgit@sifl
--
paul moore
http://www.paul-moore.com
On 2020-07-03 09:41, Paul Moore wrote:
> On Fri, Jul 3, 2020 at 8:41 AM Jones Desougi
> <[email protected]> wrote:
> >
> > Doesn't seem entirely consistent now either though. Two cases below.
>
> Yes, you're right, that patch was incorrect; thanks for catching that.
> I just posted a fix (lore link below) that fixes the two problems you
> pointed out as well as converts a call in a RCU protected section to
> an ATOMIC.
Thanks Paul. I was just about to switch branches and fix these. :-)
I really need to upgrade this devel machine so I can use git 2.x
worktrees...
I checked all of these (I thought) thoroughly before I started changing
code and obviously didn't after. :-/
> https://lore.kernel.org/linux-audit/159378341669.5956.13490174029711421419.stgit@sifl
>
> paul moore
- RGB
--
Richard Guy Briggs <[email protected]>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635