From: Richard Guy Briggs Date: Thu, 10 Nov 2016 06:41:14 +0000 (-0500) Subject: audit: skip sessionid sentinel value when auto-incrementing X-Git-Tag: v4.10-rc1~115^2~13 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=833fc48d18ce3595990b405ae82a160b33028994;p=linux.git 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 Signed-off-by: Paul Moore --- diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 8c434318ec8d..d161b17ce8ce 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -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;