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selinux: Deprecate /sys/fs/selinux/user

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The only known user of this interface was libselinux and its
internal usage of this interface for get_ordered_context_list(3)
was removed in Feb 2020, with a deprecation warning added to
security_compute_user(3) at the same time. Add a deprecation
warning to the kernel and schedule it for final removal in 2025.

Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Stephen Smalley 2024-10-04 13:27:10 -04:00 committed by Paul Moore
parent 9aba55b1fb
commit d7b6918e22
2 changed files with 16 additions and 0 deletions
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12
Documentation/ABI/obsolete/sysfs-selinux-user Normal file
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@ -0,0 +1,12 @@
What: /sys/fs/selinux/user
Date: April 2005 (predates git)
KernelVersion: 2.6.12-rc2 (predates git)
Contact: selinux@vger.kernel.org
Description:
The selinuxfs "user" node allows userspace to request a list
of security contexts that can be reached for a given SELinux
user from a given starting context. This was used by libselinux
when various login-style programs requested contexts for
users, but libselinux stopped using it in 2020.
Kernel support will be removed no sooner than Dec 2025.

4
security/selinux/selinuxfs.c
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@ -1069,6 +1069,10 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
int rc;
u32 i, len, nsids;
pr_warn_ratelimited("SELinux: %s (%d) wrote to /sys/fs/selinux/user!"
" This will not be supported in the future; please update your"
" userspace.\n", current->comm, current->pid);
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
NULL);