Commit 3af54c9b authored Oct 30, 2010 by Vasiliy Kulikov Committed by Linus Torvalds Oct 30, 2010

ipc: shm: fix information leak to userland



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>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 504b701b

ipc/shm.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -479,6 +479,7 @@ 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;