svn commit: r343262 - head/sys/amd64/linux

[Ed Maste]

Author: emaste
Date: Mon Jan 21 16:25:40 2019
New Revision: 343262
URL: https://svnweb.freebsd.org/changeset/base/343262

Log:
  linuxulator: fix stack memory disclosure in linux_sigaltstack
  
  admbugs:	765
  Reported by:	Vlad Tsyrklevich <vlad at tsyrklevich.net>
  Reviewed by:	andrew
  MFC after:	1 day
  Security:	Kernel memory disclosure
  Sponsored by:   The FreeBSD Foundation

Modified:
  head/sys/amd64/linux/linux_machdep.c

Modified: head/sys/amd64/linux/linux_machdep.c
==============================================================================
--- head/sys/amd64/linux/linux_machdep.c	Mon Jan 21 16:21:03 2019	(r343261)
+++ head/sys/amd64/linux/linux_machdep.c	Mon Jan 21 16:25:40 2019	(r343262)
@@ -201,6 +201,7 @@ linux_sigaltstack(struct thread *td, struct linux_siga
 	l_stack_t lss;
 	int error;
 
+	memset(&lss, 0, sizeof(lss));
 	LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss);
 
 	if (uap->uss != NULL) {