svn commit: r270320 - head/sys/kern

[Konstantin Belousov]

Author: kib
Date: Fri Aug 22 07:52:47 2014
New Revision: 270320
URL: http://svnweb.freebsd.org/changeset/base/270320

Log:
  Check the validity of struct sigaction sa_flags value, reject unknown
  flags.
  
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/kern/kern_sig.c

Modified: head/sys/kern/kern_sig.c
==============================================================================
--- head/sys/kern/kern_sig.c	Fri Aug 22 07:09:54 2014	(r270319)
+++ head/sys/kern/kern_sig.c	Fri Aug 22 07:52:47 2014	(r270320)
@@ -639,6 +639,10 @@ kern_sigaction(td, sig, act, oact, flags
 
 	if (!_SIG_VALID(sig))
 		return (EINVAL);
+	if (act != NULL && (act->sa_flags & ~(SA_ONSTACK | SA_RESTART |
+	    SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | SA_NOCLDWAIT |
+	    SA_SIGINFO)) != 0)
+		return (EINVAL);
 
 	PROC_LOCK(p);
 	ps = p->p_sigacts;