From f3aa864b00bbcd49327d7911f8c39a65e51e2ca9 Mon Sep 17 00:00:00 2001
From: Vasiliy Kulikov <segooon@gmail.com>
Date: Sat, 30 Oct 2010 18:22:49 +0400
Subject: [PATCH] ipc: shm: fix information leak to userland

commit 3af54c9bd9e6f14f896aac1bb0e8405ae0bc7a44 upstream.

The shmid_ds structure is copied to userland with shm_unused{,2,3}
fields unitialized.  It leads to leaking of contents of kernel stack
memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 ipc/shm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ipc/shm.c b/ipc/shm.c
index 52ed77eb9713..b42738067146 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -473,6 +473,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
 	    {
 		struct shmid_ds out;
 
+		memset(&out, 0, sizeof(out));
 		ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
 		out.shm_segsz	= in->shm_segsz;
 		out.shm_atime	= in->shm_atime;
-- 
2.39.5