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ipc: shm: fix information leak to userland

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commit 3af54c9bd9 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>
This commit is contained in:
Vasiliy Kulikov 2010-10-30 18:22:49 +04:00 committed by Greg Kroah-Hartman
parent 3cb129c0ea
commit cebb2f20e0
1 changed files with 1 additions and 0 deletions
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ipc/shm.c
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@ -476,6 +476,7 @@ 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;