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authorDan Rosenberg <drosenberg@vsecurity.com>2010-10-27 15:34:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:13 -0700
commit03145beb455cf5c20a761e8451e30b8a74ba58d9 (patch)
treea27b2221818b89039fc948d19780d52bb5c70789 /ipc/compat_mq.c
parentipc/shm.c: add RSS and swap size information to /proc/sysvipc/shm (diff)
downloadlinux-dev-03145beb455cf5c20a761e8451e30b8a74ba58d9.tar.xz
linux-dev-03145beb455cf5c20a761e8451e30b8a74ba58d9.zip
ipc: initialize structure memory to zero for compat functions
This takes care of leaking uninitialized kernel stack memory to userspace from non-zeroed fields in structs in compat ipc functions. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--ipc/compat_mq.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/ipc/compat_mq.c b/ipc/compat_mq.c
index d8d1e9ff4e88..380ea4fe08e7 100644
--- a/ipc/compat_mq.c
+++ b/ipc/compat_mq.c
@@ -53,6 +53,9 @@ asmlinkage long compat_sys_mq_open(const char __user *u_name,
void __user *p = NULL;
if (u_attr && oflag & O_CREAT) {
struct mq_attr attr;
+
+ memset(&attr, 0, sizeof(attr));
+
p = compat_alloc_user_space(sizeof(attr));
if (get_compat_mq_attr(&attr, u_attr) ||
copy_to_user(p, &attr, sizeof(attr)))
@@ -127,6 +130,8 @@ asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));
long ret;
+ memset(&mqstat, 0, sizeof(mqstat));
+
if (u_mqstat) {
if (get_compat_mq_attr(&mqstat, u_mqstat) ||
copy_to_user(p, &mqstat, sizeof(mqstat)))