Commit 3af54c9b authored by Vasiliy Kulikov's avatar Vasiliy Kulikov Committed by Linus Torvalds

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: default avatarVasiliy Kulikov <segooon@gmail.com>
Acked-by: default avatarAl Viro <viro@ZenIV.linux.org.uk>
Cc: stable@kernel.org
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 504b701b
......@@ -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;
......
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