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audit: skip sessionid sentinel value when auto-incrementing 

The value (unsigned int)-1 is used as a sentinel to indicate the
sessionID is unset.  Skip this value when the session_id value wraps.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Richard Guy Briggs 2016-11-10 01:41:14 -05:00 committed by Paul Moore
parent 8443075eac
commit 833fc48d18
1 changed files with 4 additions and 1 deletions
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5
kernel/auditsc.c
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@ -2025,8 +2025,11 @@ int audit_set_loginuid(kuid_t loginuid)
goto out;
/* are we setting or clearing? */
if (uid_valid(loginuid))
if (uid_valid(loginuid)) {
sessionid = (unsigned int)atomic_inc_return(&session_id);
if (unlikely(sessionid == (unsigned int)-1))
sessionid = (unsigned int)atomic_inc_return(&session_id);
}
task->sessionid = sessionid;
task->loginuid = loginuid;