[PATCH] ipc: shm: fix information leak to userland

Vasiliy Kulikov
2010-10-30T09:04:54Z

Structure shmid_ds 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>
---
Compile tested.

ipc/shm.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/ipc/shm.c b/ipc/shm.c
index fd658a1..7d3bb22 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;
--
1.7.0.4