svn commit: r301053 - in head/sys: compat/linux kern

[Gleb Smirnoff]

Author: glebius
Date: Tue May 31 16:56:30 2016
New Revision: 301053
URL: https://svnweb.freebsd.org/changeset/base/301053

Log:
  Fix kernel stack disclosures in the Linux and 4.3BSD compat layers.
  
  Submitted by:	CTurt
  Security:	SA-16:20
  Security:	SA-16:21

Modified:
  head/sys/compat/linux/linux_ioctl.c
  head/sys/compat/linux/linux_misc.c
  head/sys/kern/vfs_syscalls.c

Modified: head/sys/compat/linux/linux_ioctl.c
==============================================================================
--- head/sys/compat/linux/linux_ioctl.c	Tue May 31 16:55:50 2016	(r301052)
+++ head/sys/compat/linux/linux_ioctl.c	Tue May 31 16:56:30 2016	(r301053)
@@ -916,6 +916,8 @@ linux_ioctl_termio(struct thread *td, st
 
 	case LINUX_TIOCGSERIAL: {
 		struct linux_serial_struct lss;
+
+		bzero(&lss, sizeof(lss));
 		lss.type = LINUX_PORT_16550A;
 		lss.flags = 0;
 		lss.close_delay = 0;

Modified: head/sys/compat/linux/linux_misc.c
==============================================================================
--- head/sys/compat/linux/linux_misc.c	Tue May 31 16:55:50 2016	(r301052)
+++ head/sys/compat/linux/linux_misc.c	Tue May 31 16:56:30 2016	(r301053)
@@ -149,6 +149,7 @@ linux_sysinfo(struct thread *td, struct 
 	int i, j;
 	struct timespec ts;
 
+	bzero(&sysinfo, sizeof(sysinfo));
 	getnanouptime(&ts);
 	if (ts.tv_nsec != 0)
 		ts.tv_sec++;

Modified: head/sys/kern/vfs_syscalls.c
==============================================================================
--- head/sys/kern/vfs_syscalls.c	Tue May 31 16:55:50 2016	(r301052)
+++ head/sys/kern/vfs_syscalls.c	Tue May 31 16:56:30 2016	(r301053)
@@ -2068,6 +2068,7 @@ cvtstat(st, ost)
 	struct ostat *ost;
 {
 
+	bzero(ost, sizeof(*ost));
 	ost->st_dev = st->st_dev;
 	ost->st_ino = st->st_ino;
 	ost->st_mode = st->st_mode;