Enable the new added extended attribute related syscalls.
Signed-off-by: Christian Göttsche <[email protected]>
---
TODO:
- deprecate traditional syscalls (setxattr, ...)?
- resolve possible conflicts with proposed readfile syscall
---
arch/alpha/kernel/syscalls/syscall.tbl | 4 ++++
arch/arm/tools/syscall.tbl | 4 ++++
arch/arm64/include/asm/unistd.h | 2 +-
arch/arm64/include/asm/unistd32.h | 8 ++++++++
arch/ia64/kernel/syscalls/syscall.tbl | 4 ++++
arch/m68k/kernel/syscalls/syscall.tbl | 4 ++++
arch/microblaze/kernel/syscalls/syscall.tbl | 4 ++++
arch/mips/kernel/syscalls/syscall_n32.tbl | 4 ++++
arch/mips/kernel/syscalls/syscall_n64.tbl | 4 ++++
arch/mips/kernel/syscalls/syscall_o32.tbl | 4 ++++
arch/parisc/kernel/syscalls/syscall.tbl | 4 ++++
arch/powerpc/kernel/syscalls/syscall.tbl | 4 ++++
arch/s390/kernel/syscalls/syscall.tbl | 4 ++++
arch/sh/kernel/syscalls/syscall.tbl | 4 ++++
arch/sparc/kernel/syscalls/syscall.tbl | 4 ++++
arch/x86/entry/syscalls/syscall_32.tbl | 4 ++++
arch/x86/entry/syscalls/syscall_64.tbl | 4 ++++
arch/xtensa/kernel/syscalls/syscall.tbl | 4 ++++
include/asm-generic/audit_change_attr.h | 6 ++++++
include/linux/syscalls.h | 8 ++++++++
include/uapi/asm-generic/unistd.h | 12 +++++++++++-
21 files changed, 98 insertions(+), 2 deletions(-)
diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
index 3515bc4f16a4..826a8a36da81 100644
--- a/arch/alpha/kernel/syscalls/syscall.tbl
+++ b/arch/alpha/kernel/syscalls/syscall.tbl
@@ -490,3 +490,7 @@
558 common process_mrelease sys_process_mrelease
559 common futex_waitv sys_futex_waitv
560 common set_mempolicy_home_node sys_ni_syscall
+561 common setxattrat sys_setxattrat
+562 common getxattrat sys_getxattrat
+563 common listxattrat sys_listxattrat
+564 common removexattrat sys_removexattrat
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
index ac964612d8b0..f0e9d9d487f0 100644
--- a/arch/arm/tools/syscall.tbl
+++ b/arch/arm/tools/syscall.tbl
@@ -464,3 +464,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
index 037feba03a51..63a8a9c4abc1 100644
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
@@ -39,7 +39,7 @@
#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5)
#define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800)
-#define __NR_compat_syscalls 451
+#define __NR_compat_syscalls 455
#endif
#define __ARCH_WANT_SYS_CLONE
diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
index 604a2053d006..cd6ac63376d1 100644
--- a/arch/arm64/include/asm/unistd32.h
+++ b/arch/arm64/include/asm/unistd32.h
@@ -907,6 +907,14 @@ __SYSCALL(__NR_process_mrelease, sys_process_mrelease)
__SYSCALL(__NR_futex_waitv, sys_futex_waitv)
#define __NR_set_mempolicy_home_node 450
__SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)
+#define __NR_setxattrat 451
+__SYSCALL(__NR_setxattrat, sys_setxattrat)
+#define __NR_getxattrat 452
+__SYSCALL(__NR_getxattrat, sys_getxattrat)
+#define __NR_listxattrat 453
+__SYSCALL(__NR_listxattrat, sys_listxattrat)
+#define __NR_removexattrat 454
+__SYSCALL(__NR_removexattrat, sys_removexattrat)
/*
* Please add new compat syscalls above this comment and update
diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
index 78b1d03e86e1..6e942a935a27 100644
--- a/arch/ia64/kernel/syscalls/syscall.tbl
+++ b/arch/ia64/kernel/syscalls/syscall.tbl
@@ -371,3 +371,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index b1f3940bc298..0847efdee734 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -450,3 +450,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index 820145e47350..7f619bbc718d 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -456,3 +456,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 253ff994ed2e..5e4206c0aede 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -389,3 +389,7 @@
448 n32 process_mrelease sys_process_mrelease
449 n32 futex_waitv sys_futex_waitv
450 n32 set_mempolicy_home_node sys_set_mempolicy_home_node
+451 n32 setxattrat sys_setxattrat
+452 n32 getxattrat sys_getxattrat
+453 n32 listxattrat sys_listxattrat
+454 n32 removexattrat sys_removexattrat
diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
index 3f1886ad9d80..df0f053e76cd 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -365,3 +365,7 @@
448 n64 process_mrelease sys_process_mrelease
449 n64 futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 n64 setxattrat sys_setxattrat
+452 n64 getxattrat sys_getxattrat
+453 n64 listxattrat sys_listxattrat
+454 n64 removexattrat sys_removexattrat
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 8f243e35a7b2..09ec31ad475f 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -438,3 +438,7 @@
448 o32 process_mrelease sys_process_mrelease
449 o32 futex_waitv sys_futex_waitv
450 o32 set_mempolicy_home_node sys_set_mempolicy_home_node
+451 o32 setxattrat sys_setxattrat
+452 o32 getxattrat sys_getxattrat
+453 o32 listxattrat sys_listxattrat
+454 o32 removexattrat sys_removexattrat
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 8a99c998da9b..fe3f4f41aee6 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -448,3 +448,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
index 2600b4237292..bee27f650397 100644
--- a/arch/powerpc/kernel/syscalls/syscall.tbl
+++ b/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -530,3 +530,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 nospu set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
index 799147658dee..d1fbad4b7864 100644
--- a/arch/s390/kernel/syscalls/syscall.tbl
+++ b/arch/s390/kernel/syscalls/syscall.tbl
@@ -453,3 +453,7 @@
448 common process_mrelease sys_process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat sys_removexattrat
diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
index 2de85c977f54..d4daa8afe45c 100644
--- a/arch/sh/kernel/syscalls/syscall.tbl
+++ b/arch/sh/kernel/syscalls/syscall.tbl
@@ -453,3 +453,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
index 4398cc6fb68d..510d5175f80a 100644
--- a/arch/sparc/kernel/syscalls/syscall.tbl
+++ b/arch/sparc/kernel/syscalls/syscall.tbl
@@ -496,3 +496,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 320480a8db4f..8488cc157fe0 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -455,3 +455,7 @@
448 i386 process_mrelease sys_process_mrelease
449 i386 futex_waitv sys_futex_waitv
450 i386 set_mempolicy_home_node sys_set_mempolicy_home_node
+451 i386 setxattrat sys_setxattrat
+452 i386 getxattrat sys_getxattrat
+453 i386 listxattrat sys_listxattrat
+454 i386 removexattrat sys_removexattrat
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index c84d12608cd2..f45d723d5a30 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -372,6 +372,10 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
#
# Due to a historical design error, certain syscalls are numbered differently
diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
index 52c94ab5c205..dbafe441a83f 100644
--- a/arch/xtensa/kernel/syscalls/syscall.tbl
+++ b/arch/xtensa/kernel/syscalls/syscall.tbl
@@ -421,3 +421,7 @@
448 common process_mrelease sys_process_mrelease
449 common futex_waitv sys_futex_waitv
450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common setxattrat sys_setxattrat
+452 common getxattrat sys_getxattrat
+453 common listxattrat sys_listxattrat
+454 common removexattrat sys_removexattrat
diff --git a/include/asm-generic/audit_change_attr.h b/include/asm-generic/audit_change_attr.h
index 331670807cf0..cc840537885f 100644
--- a/include/asm-generic/audit_change_attr.h
+++ b/include/asm-generic/audit_change_attr.h
@@ -11,9 +11,15 @@ __NR_lchown,
__NR_fchown,
#endif
__NR_setxattr,
+#ifdef __NR_setxattrat
+__NR_setxattrat,
+#endif
__NR_lsetxattr,
__NR_fsetxattr,
__NR_removexattr,
+#ifdef __NR_removexattrat
+__NR_removexattrat,
+#endif
__NR_lremovexattr,
__NR_fremovexattr,
#ifdef __NR_fchownat
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index a34b0f9a9972..090b9b5229a0 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -348,23 +348,31 @@ asmlinkage long sys_io_uring_register(unsigned int fd, unsigned int op,
/* fs/xattr.c */
asmlinkage long sys_setxattr(const char __user *path, const char __user *name,
const void __user *value, size_t size, int flags);
+asmlinkage long sys_setxattrat(int dfd, const char __user *path, const char __user *name,
+ const void __user *value, size_t size, int flags);
asmlinkage long sys_lsetxattr(const char __user *path, const char __user *name,
const void __user *value, size_t size, int flags);
asmlinkage long sys_fsetxattr(int fd, const char __user *name,
const void __user *value, size_t size, int flags);
asmlinkage long sys_getxattr(const char __user *path, const char __user *name,
void __user *value, size_t size);
+asmlinkage long sys_getxattrat(int dfd, const char __user *path, const char __user *name,
+ void __user *value, size_t size, int flags);
asmlinkage long sys_lgetxattr(const char __user *path, const char __user *name,
void __user *value, size_t size);
asmlinkage long sys_fgetxattr(int fd, const char __user *name,
void __user *value, size_t size);
asmlinkage long sys_listxattr(const char __user *path, char __user *list,
size_t size);
+asmlinkage long sys_listxattrat(int dfd, const char __user *path, char __user *list,
+ size_t size, int flags);
asmlinkage long sys_llistxattr(const char __user *path, char __user *list,
size_t size);
asmlinkage long sys_flistxattr(int fd, char __user *list, size_t size);
asmlinkage long sys_removexattr(const char __user *path,
const char __user *name);
+asmlinkage long sys_removexattrat(int dfd, const char __user *path,
+ const char __user *name, int flags);
asmlinkage long sys_lremovexattr(const char __user *path,
const char __user *name);
asmlinkage long sys_fremovexattr(int fd, const char __user *name);
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 45fa180cc56a..4fcc71612b7a 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -886,8 +886,18 @@ __SYSCALL(__NR_futex_waitv, sys_futex_waitv)
#define __NR_set_mempolicy_home_node 450
__SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)
+/* fs/xattr.c */
+#define __NR_setxattrat 451
+__SYSCALL(__NR_setxattrat, sys_setxattrat)
+#define __NR_getxattrat 452
+__SYSCALL(__NR_getxattrat, sys_getxattrat)
+#define __NR_listxattrat 453
+__SYSCALL(__NR_listxattrat, sys_listxattrat)
+#define __NR_removexattrat 454
+__SYSCALL(__NR_removexattrat, sys_removexattrat)
+
#undef __NR_syscalls
-#define __NR_syscalls 451
+#define __NR_syscalls 455
/*
* 32 bit systems traditionally used different
--
2.37.2
On Tue, Aug 30, 2022 at 05:28:38PM +0200, Christian Göttsche wrote:
> Enable the new added extended attribute related syscalls.
>
> Signed-off-by: Christian Göttsche <[email protected]>
> ---
Fwiw, I think a while ago it was pointed out that for most syscall
additions you can just fold the hookup patch in. It probably also
wouldn't hurt to trim that Cc list significantly down to mostly the
lists...
Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
removexattrat() to enable extended attribute operations via file
descriptors. This can be used from userspace to avoid race conditions,
especially on security related extended attributes, like SELinux labels
("security.selinux") via setfiles(8).
Use the do_{name}at() pattern from fs/open.c.
Use a single flag parameter for extended attribute flags (currently
XATTR_CREATE and XATTR_REPLACE) and *at() flags to not exceed six
syscall arguments in setxattrat().
Previous discussion ("f*xattr: allow O_PATH descriptors"): https://lore.kernel.org/all/[email protected]/
Signed-off-by: Christian Göttsche <[email protected]>
---
fs/xattr.c | 108 +++++++++++++++++++++++++++++++++++++++++------------
1 file changed, 85 insertions(+), 23 deletions(-)
diff --git a/fs/xattr.c b/fs/xattr.c
index a1f4998bc6be..a4738e28be8c 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -27,6 +27,8 @@
#include "internal.h"
+#define XATTR__FLAGS (XATTR_CREATE | XATTR_REPLACE)
+
static const char *
strcmp_prefix(const char *a, const char *a_prefix)
{
@@ -559,7 +561,7 @@ int setxattr_copy(const char __user *name, struct xattr_ctx *ctx)
{
int error;
- if (ctx->flags & ~(XATTR_CREATE|XATTR_REPLACE))
+ if (ctx->flags & ~XATTR__FLAGS)
return -EINVAL;
error = strncpy_from_user(ctx->kname->name, name,
@@ -626,21 +628,31 @@ setxattr(struct user_namespace *mnt_userns, struct dentry *d,
return error;
}
-static int path_setxattr(const char __user *pathname,
+static int do_setxattrat(int dfd, const char __user *pathname,
const char __user *name, const void __user *value,
- size_t size, int flags, unsigned int lookup_flags)
+ size_t size, int flags)
{
struct path path;
int error;
+ int lookup_flags;
+
+ /* AT_ and XATTR_ flags must not overlap. */
+ BUILD_BUG_ON(((AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) & XATTR__FLAGS) != 0);
+
+ if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH | XATTR__FLAGS)) != 0)
+ return -EINVAL;
+ lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+ if (flags & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
retry:
- error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+ error = user_path_at(dfd, pathname, lookup_flags, &path);
if (error)
return error;
error = mnt_want_write(path.mnt);
if (!error) {
error = setxattr(mnt_user_ns(path.mnt), path.dentry, name,
- value, size, flags);
+ value, size, flags & XATTR__FLAGS);
mnt_drop_write(path.mnt);
}
path_put(&path);
@@ -651,18 +663,25 @@ static int path_setxattr(const char __user *pathname,
return error;
}
+SYSCALL_DEFINE6(setxattrat, int, dfd, const char __user *, pathname,
+ const char __user *, name, const void __user *, value,
+ size_t, size, int, flags)
+{
+ return do_setxattrat(dfd, pathname, name, value, size, flags);
+}
+
SYSCALL_DEFINE5(setxattr, const char __user *, pathname,
const char __user *, name, const void __user *, value,
size_t, size, int, flags)
{
- return path_setxattr(pathname, name, value, size, flags, LOOKUP_FOLLOW);
+ return do_setxattrat(AT_FDCWD, pathname, name, value, size, flags);
}
SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname,
const char __user *, name, const void __user *, value,
size_t, size, int, flags)
{
- return path_setxattr(pathname, name, value, size, flags, 0);
+ return do_setxattrat(AT_FDCWD, pathname, name, value, size, flags | AT_SYMLINK_NOFOLLOW);
}
SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
@@ -745,14 +764,22 @@ getxattr(struct user_namespace *mnt_userns, struct dentry *d,
return error;
}
-static ssize_t path_getxattr(const char __user *pathname,
+static ssize_t do_getxattrat(int dfd, const char __user *pathname,
const char __user *name, void __user *value,
- size_t size, unsigned int lookup_flags)
+ size_t size, int flags)
{
struct path path;
ssize_t error;
+ int lookup_flags;
+
+ if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+ return -EINVAL;
+
+ lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+ if (flags & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
retry:
- error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+ error = user_path_at(dfd, pathname, lookup_flags, &path);
if (error)
return error;
error = getxattr(mnt_user_ns(path.mnt), path.dentry, name, value, size);
@@ -764,16 +791,23 @@ static ssize_t path_getxattr(const char __user *pathname,
return error;
}
+SYSCALL_DEFINE6(getxattrat, int, dfd, const char __user *, pathname,
+ const char __user *, name, void __user *, value, size_t, size,
+ int, flags)
+{
+ return do_getxattrat(dfd, pathname, name, value, size, flags);
+}
+
SYSCALL_DEFINE4(getxattr, const char __user *, pathname,
const char __user *, name, void __user *, value, size_t, size)
{
- return path_getxattr(pathname, name, value, size, LOOKUP_FOLLOW);
+ return do_getxattrat(AT_FDCWD, pathname, name, value, size, 0);
}
SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname,
const char __user *, name, void __user *, value, size_t, size)
{
- return path_getxattr(pathname, name, value, size, 0);
+ return do_getxattrat(AT_FDCWD, pathname, name, value, size, AT_SYMLINK_NOFOLLOW);
}
SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
@@ -823,13 +857,21 @@ listxattr(struct dentry *d, char __user *list, size_t size)
return error;
}
-static ssize_t path_listxattr(const char __user *pathname, char __user *list,
- size_t size, unsigned int lookup_flags)
+static ssize_t do_listxattrat(int dfd, const char __user *pathname, char __user *list,
+ size_t size, int flags)
{
struct path path;
ssize_t error;
+ int lookup_flags;
+
+ if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+ return -EINVAL;
+
+ lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+ if (flags & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
retry:
- error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+ error = user_path_at(dfd, pathname, lookup_flags, &path);
if (error)
return error;
error = listxattr(path.dentry, list, size);
@@ -841,16 +883,22 @@ static ssize_t path_listxattr(const char __user *pathname, char __user *list,
return error;
}
+SYSCALL_DEFINE5(listxattrat, int, dfd, const char __user *, pathname, char __user *, list,
+ size_t, size, int, flags)
+{
+ return do_listxattrat(dfd, pathname, list, size, flags);
+}
+
SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list,
size_t, size)
{
- return path_listxattr(pathname, list, size, LOOKUP_FOLLOW);
+ return do_listxattrat(AT_FDCWD, pathname, list, size, 0);
}
SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list,
size_t, size)
{
- return path_listxattr(pathname, list, size, 0);
+ return do_listxattrat(AT_FDCWD, pathname, list, size, AT_SYMLINK_NOFOLLOW);
}
SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
@@ -869,7 +917,7 @@ SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
/*
* Extended attribute REMOVE operations
*/
-static long
+static int
removexattr(struct user_namespace *mnt_userns, struct dentry *d,
const char __user *name)
{
@@ -885,13 +933,21 @@ removexattr(struct user_namespace *mnt_userns, struct dentry *d,
return vfs_removexattr(mnt_userns, d, kname);
}
-static int path_removexattr(const char __user *pathname,
- const char __user *name, unsigned int lookup_flags)
+static int do_removexattrat(int dfd, const char __user *pathname,
+ const char __user *name, int flags)
{
struct path path;
int error;
+ int lookup_flags;
+
+ if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+ return -EINVAL;
+
+ lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+ if (flags & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
retry:
- error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+ error = user_path_at(dfd, pathname, lookup_flags, &path);
if (error)
return error;
error = mnt_want_write(path.mnt);
@@ -907,16 +963,22 @@ static int path_removexattr(const char __user *pathname,
return error;
}
+SYSCALL_DEFINE4(removexattrat, int, dfd, const char __user *, pathname,
+ const char __user *, name, int, flags)
+{
+ return do_removexattrat(dfd, pathname, name, flags);
+}
+
SYSCALL_DEFINE2(removexattr, const char __user *, pathname,
const char __user *, name)
{
- return path_removexattr(pathname, name, LOOKUP_FOLLOW);
+ return do_removexattrat(AT_FDCWD, pathname, name, 0);
}
SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname,
const char __user *, name)
{
- return path_removexattr(pathname, name, 0);
+ return do_removexattrat(AT_FDCWD, pathname, name, AT_SYMLINK_NOFOLLOW);
}
SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
--
2.37.2
On Tue, Aug 30, 2022 at 05:28:39PM +0200, Christian Göttsche wrote:
> Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
> removexattrat() to enable extended attribute operations via file
> descriptors. This can be used from userspace to avoid race conditions,
> especially on security related extended attributes, like SELinux labels
> ("security.selinux") via setfiles(8).
>
> Use the do_{name}at() pattern from fs/open.c.
> Use a single flag parameter for extended attribute flags (currently
> XATTR_CREATE and XATTR_REPLACE) and *at() flags to not exceed six
> syscall arguments in setxattrat().
>
> Previous discussion ("f*xattr: allow O_PATH descriptors"): https://lore.kernel.org/all/[email protected]/
>
> Signed-off-by: Christian Göttsche <[email protected]>
> ---
Having a way to operate via file descriptors on xattrs does make a lot
of sense to me in general. We've got code that changes ownership
recursively including using llistxattr(), getxattr(), and setxattr() any
xattrs that store ownership information and being able to passing in an
fd directly would be quite neat...
> fs/xattr.c | 108 +++++++++++++++++++++++++++++++++++++++++------------
> 1 file changed, 85 insertions(+), 23 deletions(-)
>
> diff --git a/fs/xattr.c b/fs/xattr.c
> index a1f4998bc6be..a4738e28be8c 100644
> --- a/fs/xattr.c
> +++ b/fs/xattr.c
> @@ -27,6 +27,8 @@
>
> #include "internal.h"
>
> +#define XATTR__FLAGS (XATTR_CREATE | XATTR_REPLACE)
> +
> static const char *
> strcmp_prefix(const char *a, const char *a_prefix)
> {
> @@ -559,7 +561,7 @@ int setxattr_copy(const char __user *name, struct xattr_ctx *ctx)
> {
> int error;
>
> - if (ctx->flags & ~(XATTR_CREATE|XATTR_REPLACE))
> + if (ctx->flags & ~XATTR__FLAGS)
> return -EINVAL;
>
> error = strncpy_from_user(ctx->kname->name, name,
> @@ -626,21 +628,31 @@ setxattr(struct user_namespace *mnt_userns, struct dentry *d,
> return error;
> }
>
> -static int path_setxattr(const char __user *pathname,
> +static int do_setxattrat(int dfd, const char __user *pathname,
> const char __user *name, const void __user *value,
> - size_t size, int flags, unsigned int lookup_flags)
> + size_t size, int flags)
> {
> struct path path;
> int error;
> + int lookup_flags;
> +
> + /* AT_ and XATTR_ flags must not overlap. */
> + BUILD_BUG_ON(((AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) & XATTR__FLAGS) != 0);
> +
> + if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH | XATTR__FLAGS)) != 0)
> + return -EINVAL;
It's a bit tasteless that we end up mixing AT_* and XATTR_* flags for sure.
>
> + lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
> + if (flags & AT_EMPTY_PATH)
> + lookup_flags |= LOOKUP_EMPTY;
> retry:
> - error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
> + error = user_path_at(dfd, pathname, lookup_flags, &path);
> if (error)
> return error;
> error = mnt_want_write(path.mnt);
> if (!error) {
> error = setxattr(mnt_user_ns(path.mnt), path.dentry, name,
> - value, size, flags);
> + value, size, flags & XATTR__FLAGS);
> mnt_drop_write(path.mnt);
> }
> path_put(&path);
> @@ -651,18 +663,25 @@ static int path_setxattr(const char __user *pathname,
> return error;
> }
>
> +SYSCALL_DEFINE6(setxattrat, int, dfd, const char __user *, pathname,
> + const char __user *, name, const void __user *, value,
> + size_t, size, int, flags)
> +{
> + return do_setxattrat(dfd, pathname, name, value, size, flags);
> +}
I'm not sure we need setxattrat()? Yes, it doesn't have a "pathname"
argument but imho it's not that big of a deal to first perform the
lookup via openat*() and then call fsetxattr() and have fsetxattr()
recognize AT_* flags. It's not that the xattr system calls are
lightweight in the first place.
But maybe the consistency is nicer. I have no strong feelings here.
On 2022-08-30 17:28, Christian G?ttsche wrote:
> Enable the new added extended attribute related syscalls.
>
> Signed-off-by: Christian G?ttsche <[email protected]>
I can't speak to the completeness of the arch list, but I'm glad to see
the audit attr change bits in there.
> ---
> TODO:
> - deprecate traditional syscalls (setxattr, ...)?
> - resolve possible conflicts with proposed readfile syscall
> ---
> arch/alpha/kernel/syscalls/syscall.tbl | 4 ++++
> arch/arm/tools/syscall.tbl | 4 ++++
> arch/arm64/include/asm/unistd.h | 2 +-
> arch/arm64/include/asm/unistd32.h | 8 ++++++++
> arch/ia64/kernel/syscalls/syscall.tbl | 4 ++++
> arch/m68k/kernel/syscalls/syscall.tbl | 4 ++++
> arch/microblaze/kernel/syscalls/syscall.tbl | 4 ++++
> arch/mips/kernel/syscalls/syscall_n32.tbl | 4 ++++
> arch/mips/kernel/syscalls/syscall_n64.tbl | 4 ++++
> arch/mips/kernel/syscalls/syscall_o32.tbl | 4 ++++
> arch/parisc/kernel/syscalls/syscall.tbl | 4 ++++
> arch/powerpc/kernel/syscalls/syscall.tbl | 4 ++++
> arch/s390/kernel/syscalls/syscall.tbl | 4 ++++
> arch/sh/kernel/syscalls/syscall.tbl | 4 ++++
> arch/sparc/kernel/syscalls/syscall.tbl | 4 ++++
> arch/x86/entry/syscalls/syscall_32.tbl | 4 ++++
> arch/x86/entry/syscalls/syscall_64.tbl | 4 ++++
> arch/xtensa/kernel/syscalls/syscall.tbl | 4 ++++
> include/asm-generic/audit_change_attr.h | 6 ++++++
> include/linux/syscalls.h | 8 ++++++++
> include/uapi/asm-generic/unistd.h | 12 +++++++++++-
> 21 files changed, 98 insertions(+), 2 deletions(-)
>
> diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
> index 3515bc4f16a4..826a8a36da81 100644
> --- a/arch/alpha/kernel/syscalls/syscall.tbl
> +++ b/arch/alpha/kernel/syscalls/syscall.tbl
> @@ -490,3 +490,7 @@
> 558 common process_mrelease sys_process_mrelease
> 559 common futex_waitv sys_futex_waitv
> 560 common set_mempolicy_home_node sys_ni_syscall
> +561 common setxattrat sys_setxattrat
> +562 common getxattrat sys_getxattrat
> +563 common listxattrat sys_listxattrat
> +564 common removexattrat sys_removexattrat
> diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
> index ac964612d8b0..f0e9d9d487f0 100644
> --- a/arch/arm/tools/syscall.tbl
> +++ b/arch/arm/tools/syscall.tbl
> @@ -464,3 +464,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h
> index 037feba03a51..63a8a9c4abc1 100644
> --- a/arch/arm64/include/asm/unistd.h
> +++ b/arch/arm64/include/asm/unistd.h
> @@ -39,7 +39,7 @@
> #define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5)
> #define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800)
>
> -#define __NR_compat_syscalls 451
> +#define __NR_compat_syscalls 455
> #endif
>
> #define __ARCH_WANT_SYS_CLONE
> diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
> index 604a2053d006..cd6ac63376d1 100644
> --- a/arch/arm64/include/asm/unistd32.h
> +++ b/arch/arm64/include/asm/unistd32.h
> @@ -907,6 +907,14 @@ __SYSCALL(__NR_process_mrelease, sys_process_mrelease)
> __SYSCALL(__NR_futex_waitv, sys_futex_waitv)
> #define __NR_set_mempolicy_home_node 450
> __SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)
> +#define __NR_setxattrat 451
> +__SYSCALL(__NR_setxattrat, sys_setxattrat)
> +#define __NR_getxattrat 452
> +__SYSCALL(__NR_getxattrat, sys_getxattrat)
> +#define __NR_listxattrat 453
> +__SYSCALL(__NR_listxattrat, sys_listxattrat)
> +#define __NR_removexattrat 454
> +__SYSCALL(__NR_removexattrat, sys_removexattrat)
>
> /*
> * Please add new compat syscalls above this comment and update
> diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
> index 78b1d03e86e1..6e942a935a27 100644
> --- a/arch/ia64/kernel/syscalls/syscall.tbl
> +++ b/arch/ia64/kernel/syscalls/syscall.tbl
> @@ -371,3 +371,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
> index b1f3940bc298..0847efdee734 100644
> --- a/arch/m68k/kernel/syscalls/syscall.tbl
> +++ b/arch/m68k/kernel/syscalls/syscall.tbl
> @@ -450,3 +450,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
> index 820145e47350..7f619bbc718d 100644
> --- a/arch/microblaze/kernel/syscalls/syscall.tbl
> +++ b/arch/microblaze/kernel/syscalls/syscall.tbl
> @@ -456,3 +456,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
> index 253ff994ed2e..5e4206c0aede 100644
> --- a/arch/mips/kernel/syscalls/syscall_n32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
> @@ -389,3 +389,7 @@
> 448 n32 process_mrelease sys_process_mrelease
> 449 n32 futex_waitv sys_futex_waitv
> 450 n32 set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 n32 setxattrat sys_setxattrat
> +452 n32 getxattrat sys_getxattrat
> +453 n32 listxattrat sys_listxattrat
> +454 n32 removexattrat sys_removexattrat
> diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
> index 3f1886ad9d80..df0f053e76cd 100644
> --- a/arch/mips/kernel/syscalls/syscall_n64.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
> @@ -365,3 +365,7 @@
> 448 n64 process_mrelease sys_process_mrelease
> 449 n64 futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 n64 setxattrat sys_setxattrat
> +452 n64 getxattrat sys_getxattrat
> +453 n64 listxattrat sys_listxattrat
> +454 n64 removexattrat sys_removexattrat
> diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
> index 8f243e35a7b2..09ec31ad475f 100644
> --- a/arch/mips/kernel/syscalls/syscall_o32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
> @@ -438,3 +438,7 @@
> 448 o32 process_mrelease sys_process_mrelease
> 449 o32 futex_waitv sys_futex_waitv
> 450 o32 set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 o32 setxattrat sys_setxattrat
> +452 o32 getxattrat sys_getxattrat
> +453 o32 listxattrat sys_listxattrat
> +454 o32 removexattrat sys_removexattrat
> diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
> index 8a99c998da9b..fe3f4f41aee6 100644
> --- a/arch/parisc/kernel/syscalls/syscall.tbl
> +++ b/arch/parisc/kernel/syscalls/syscall.tbl
> @@ -448,3 +448,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
> index 2600b4237292..bee27f650397 100644
> --- a/arch/powerpc/kernel/syscalls/syscall.tbl
> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl
> @@ -530,3 +530,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 nospu set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
> index 799147658dee..d1fbad4b7864 100644
> --- a/arch/s390/kernel/syscalls/syscall.tbl
> +++ b/arch/s390/kernel/syscalls/syscall.tbl
> @@ -453,3 +453,7 @@
> 448 common process_mrelease sys_process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat sys_removexattrat
> diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
> index 2de85c977f54..d4daa8afe45c 100644
> --- a/arch/sh/kernel/syscalls/syscall.tbl
> +++ b/arch/sh/kernel/syscalls/syscall.tbl
> @@ -453,3 +453,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
> index 4398cc6fb68d..510d5175f80a 100644
> --- a/arch/sparc/kernel/syscalls/syscall.tbl
> +++ b/arch/sparc/kernel/syscalls/syscall.tbl
> @@ -496,3 +496,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
> index 320480a8db4f..8488cc157fe0 100644
> --- a/arch/x86/entry/syscalls/syscall_32.tbl
> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
> @@ -455,3 +455,7 @@
> 448 i386 process_mrelease sys_process_mrelease
> 449 i386 futex_waitv sys_futex_waitv
> 450 i386 set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 i386 setxattrat sys_setxattrat
> +452 i386 getxattrat sys_getxattrat
> +453 i386 listxattrat sys_listxattrat
> +454 i386 removexattrat sys_removexattrat
> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
> index c84d12608cd2..f45d723d5a30 100644
> --- a/arch/x86/entry/syscalls/syscall_64.tbl
> +++ b/arch/x86/entry/syscalls/syscall_64.tbl
> @@ -372,6 +372,10 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
>
> #
> # Due to a historical design error, certain syscalls are numbered differently
> diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
> index 52c94ab5c205..dbafe441a83f 100644
> --- a/arch/xtensa/kernel/syscalls/syscall.tbl
> +++ b/arch/xtensa/kernel/syscalls/syscall.tbl
> @@ -421,3 +421,7 @@
> 448 common process_mrelease sys_process_mrelease
> 449 common futex_waitv sys_futex_waitv
> 450 common set_mempolicy_home_node sys_set_mempolicy_home_node
> +451 common setxattrat sys_setxattrat
> +452 common getxattrat sys_getxattrat
> +453 common listxattrat sys_listxattrat
> +454 common removexattrat sys_removexattrat
> diff --git a/include/asm-generic/audit_change_attr.h b/include/asm-generic/audit_change_attr.h
> index 331670807cf0..cc840537885f 100644
> --- a/include/asm-generic/audit_change_attr.h
> +++ b/include/asm-generic/audit_change_attr.h
> @@ -11,9 +11,15 @@ __NR_lchown,
> __NR_fchown,
> #endif
> __NR_setxattr,
> +#ifdef __NR_setxattrat
> +__NR_setxattrat,
> +#endif
> __NR_lsetxattr,
> __NR_fsetxattr,
> __NR_removexattr,
> +#ifdef __NR_removexattrat
> +__NR_removexattrat,
> +#endif
> __NR_lremovexattr,
> __NR_fremovexattr,
> #ifdef __NR_fchownat
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index a34b0f9a9972..090b9b5229a0 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -348,23 +348,31 @@ asmlinkage long sys_io_uring_register(unsigned int fd, unsigned int op,
> /* fs/xattr.c */
> asmlinkage long sys_setxattr(const char __user *path, const char __user *name,
> const void __user *value, size_t size, int flags);
> +asmlinkage long sys_setxattrat(int dfd, const char __user *path, const char __user *name,
> + const void __user *value, size_t size, int flags);
> asmlinkage long sys_lsetxattr(const char __user *path, const char __user *name,
> const void __user *value, size_t size, int flags);
> asmlinkage long sys_fsetxattr(int fd, const char __user *name,
> const void __user *value, size_t size, int flags);
> asmlinkage long sys_getxattr(const char __user *path, const char __user *name,
> void __user *value, size_t size);
> +asmlinkage long sys_getxattrat(int dfd, const char __user *path, const char __user *name,
> + void __user *value, size_t size, int flags);
> asmlinkage long sys_lgetxattr(const char __user *path, const char __user *name,
> void __user *value, size_t size);
> asmlinkage long sys_fgetxattr(int fd, const char __user *name,
> void __user *value, size_t size);
> asmlinkage long sys_listxattr(const char __user *path, char __user *list,
> size_t size);
> +asmlinkage long sys_listxattrat(int dfd, const char __user *path, char __user *list,
> + size_t size, int flags);
> asmlinkage long sys_llistxattr(const char __user *path, char __user *list,
> size_t size);
> asmlinkage long sys_flistxattr(int fd, char __user *list, size_t size);
> asmlinkage long sys_removexattr(const char __user *path,
> const char __user *name);
> +asmlinkage long sys_removexattrat(int dfd, const char __user *path,
> + const char __user *name, int flags);
> asmlinkage long sys_lremovexattr(const char __user *path,
> const char __user *name);
> asmlinkage long sys_fremovexattr(int fd, const char __user *name);
> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index 45fa180cc56a..4fcc71612b7a 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -886,8 +886,18 @@ __SYSCALL(__NR_futex_waitv, sys_futex_waitv)
> #define __NR_set_mempolicy_home_node 450
> __SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)
>
> +/* fs/xattr.c */
> +#define __NR_setxattrat 451
> +__SYSCALL(__NR_setxattrat, sys_setxattrat)
> +#define __NR_getxattrat 452
> +__SYSCALL(__NR_getxattrat, sys_getxattrat)
> +#define __NR_listxattrat 453
> +__SYSCALL(__NR_listxattrat, sys_listxattrat)
> +#define __NR_removexattrat 454
> +__SYSCALL(__NR_removexattrat, sys_removexattrat)
> +
> #undef __NR_syscalls
> -#define __NR_syscalls 451
> +#define __NR_syscalls 455
>
> /*
> * 32 bit systems traditionally used different
> --
> 2.37.2
>
- 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
[linux-arch Cc'd for ABI-related stuff]
On Tue, Aug 30, 2022 at 05:28:39PM +0200, Christian G?ttsche wrote:
> Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
> removexattrat() to enable extended attribute operations via file
> descriptors. This can be used from userspace to avoid race conditions,
> especially on security related extended attributes, like SELinux labels
> ("security.selinux") via setfiles(8).
>
> Use the do_{name}at() pattern from fs/open.c.
> Use a single flag parameter for extended attribute flags (currently
> XATTR_CREATE and XATTR_REPLACE) and *at() flags to not exceed six
> syscall arguments in setxattrat().
I've no problems with the patchset aside of the flags part;
however, note that XATTR_CREATE and XATTR_REPLACE are actually exposed
to the network - the values are passed to nfsd by clients.
See nfsd4_decode_setxattr() and
BUILD_BUG_ON(XATTR_CREATE != SETXATTR4_CREATE);
BUILD_BUG_ON(XATTR_REPLACE != SETXATTR4_REPLACE);
in encode_setxattr() on the client side.
Makes me really nervous about constraints like that. Sure,
AT_... flags you are using are in the second octet and these are in
the lowest one, but...
On Thu, Sep 1, 2022 at 2:10 AM Al Viro <[email protected]> wrote:
>
> [linux-arch Cc'd for ABI-related stuff]
>
> On Tue, Aug 30, 2022 at 05:28:39PM +0200, Christian Göttsche wrote:
> > Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
> > removexattrat() to enable extended attribute operations via file
> > descriptors. This can be used from userspace to avoid race conditions,
> > especially on security related extended attributes, like SELinux labels
> > ("security.selinux") via setfiles(8).
> >
> > Use the do_{name}at() pattern from fs/open.c.
> > Use a single flag parameter for extended attribute flags (currently
> > XATTR_CREATE and XATTR_REPLACE) and *at() flags to not exceed six
> > syscall arguments in setxattrat().
>
> I've no problems with the patchset aside of the flags part;
> however, note that XATTR_CREATE and XATTR_REPLACE are actually exposed
> to the network - the values are passed to nfsd by clients.
> See nfsd4_decode_setxattr() and
> BUILD_BUG_ON(XATTR_CREATE != SETXATTR4_CREATE);
> BUILD_BUG_ON(XATTR_REPLACE != SETXATTR4_REPLACE);
> in encode_setxattr() on the client side.
>
> Makes me really nervous about constraints like that. Sure,
> AT_... flags you are using are in the second octet and these are in
> the lowest one, but...
In this context, I would like to point at
AT_EACCESS
AT_REMOVEDIR
Which are using the same namespace as the AT_ flags but define
a flag in a "private section" of that namespace for faccessat() and
for unlinkat().
unlinkat() does not technically support any of the generic AT_ flags,
but the sycall name does suggest that it is the same namespace.
At the risk of getting shouted at, I propose that we retroactively
formalize this practice and also define
AT_XATTR_* and AT_RENAME_* constants
with the accompanied BUILD_BUG_ON()
and document above the AT_ definitions that the lowest 10 bits
are reserved as private namespace for the specific syscall.
There are also the AT_STATX_*SYNC* flags that could fall
into the category of syscall private namespace, but those flags could
actually be made more generic as there are other syscalls that may
benefit from supporting them.
linkat() is one example that comes to mind.
Similar suggestions have been posted in the past:
https://lore.kernel.org/linux-fsdevel/[email protected]/
https://lore.kernel.org/linux-fsdevel/CAOQ4uxit0KYiShpEXt8b8SvN8bWWp3Ky929b+UWNDozTCUeTxg@mail.gmail.com/
Thanks,
Amir.
On 8/31/2022 3:17 PM, Al Viro wrote:
> [linux-arch Cc'd for ABI-related stuff]
The LSM list <[email protected]> should be on
this thread as SELinux isn't the only security module that uses xattrs
extensively.
>
> On Tue, Aug 30, 2022 at 05:28:39PM +0200, Christian Göttsche wrote:
>> Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
>> removexattrat() to enable extended attribute operations via file
>> descriptors. This can be used from userspace to avoid race conditions,
>> especially on security related extended attributes, like SELinux labels
>> ("security.selinux") via setfiles(8).
>>
>> Use the do_{name}at() pattern from fs/open.c.
>> Use a single flag parameter for extended attribute flags (currently
>> XATTR_CREATE and XATTR_REPLACE) and *at() flags to not exceed six
>> syscall arguments in setxattrat().
> I've no problems with the patchset aside of the flags part;
> however, note that XATTR_CREATE and XATTR_REPLACE are actually exposed
> to the network - the values are passed to nfsd by clients.
> See nfsd4_decode_setxattr() and
> BUILD_BUG_ON(XATTR_CREATE != SETXATTR4_CREATE);
> BUILD_BUG_ON(XATTR_REPLACE != SETXATTR4_REPLACE);
> in encode_setxattr() on the client side.
>
> Makes me really nervous about constraints like that. Sure,
> AT_... flags you are using are in the second octet and these are in
> the lowest one, but...