From 3af54c9bd9e6f14f896aac1bb0e8405ae0bc7a44 Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Sat, 30 Oct 2010 18:22:49 +0400 Subject: 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 Acked-by: Al Viro Cc: stable@kernel.org Signed-off-by: Linus Torvalds --- ipc/shm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/ipc/shm.c b/ipc/shm.c index fd658a1c2b88..7d3bb22a9302 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -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; -- cgit v1.2.3