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Merge tag 'lsm-pr-20260519' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm

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Pull lsm fix from Paul Moore:
 "A single LSM patch to add a missing credential mutex lock to the
  lsm_set_self_attr(2) syscall so it behaves similar to the associated
  procfs API and avoids issues with ptrace"

* tag 'lsm-pr-20260519' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm:
  lsm: hold cred_guard_mutex for lsm_set_self_attr()
This commit is contained in:
Linus Torvalds
2026-05-19 15:31:35 -05:00
parent 27fa82620c 4a9b16541a
commit e312f536f6
1 changed files with 8 additions and 1 deletions
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9
security/lsm_syscalls.c
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@@ -57,7 +57,14 @@ u64 lsm_name_to_attr(const char *name)
SYSCALL_DEFINE4(lsm_set_self_attr, unsigned int, attr, struct lsm_ctx __user *,
ctx, u32, size, u32, flags)
{
return security_setselfattr(attr, ctx, size, flags);
int rc;
rc = mutex_lock_interruptible(&current->signal->cred_guard_mutex);
if (rc < 0)
return rc;
rc = security_setselfattr(attr, ctx, size, flags);
mutex_unlock(&current->signal->cred_guard_mutex);
return rc;
}
/**