github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-09 07:03:37 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ipc: initialize structure memory to zero for compat functions

Browse Source 
commit 03145beb45 upstream.

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dan Rosenberg 2010-10-27 15:34:17 -07:00 committed by Greg Kroah-Hartman
parent 1c10b59771
commit 6606de00cc
2 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
ipc/compat.c
View File

@ -242,6 +242,8 @@ long compat_sys_semctl(int first, int second, int third, void __user *uptr)
struct semid64_ds __user *up64;
int version = compat_ipc_parse_version(&third);
memset(&s64, 0, sizeof(s64));
if (!uptr)
return -EINVAL;
if (get_user(pad, (u32 __user *) uptr))
@ -422,6 +424,8 @@ long compat_sys_msgctl(int first, int second, void __user *uptr)
int version = compat_ipc_parse_version(&second);
void __user *p;
memset(&m64, 0, sizeof(m64));
switch (second & (~IPC_64)) {
case IPC_INFO:
case IPC_RMID:
@ -595,6 +599,8 @@ long compat_sys_shmctl(int first, int second, void __user *uptr)
int err, err2;
int version = compat_ipc_parse_version(&second);
memset(&s64, 0, sizeof(s64));
switch (second & (~IPC_64)) {
case IPC_RMID:
case SHM_LOCK:

5
ipc/compat_mq.c
View File

@ -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)))