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ipc: initialize structure memory to zero for compat functions

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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 <[email protected]>
Cc: Manfred Spraul <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Rosenberg 2010-10-27 15:34:17 -07:00 • committed by Linus Torvalds
commit 03145beb45
2 changed files with 11 additions and 0 deletions
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6
ipc/compat.c
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@ -241,6 +241,8 @@ 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))
@ -421,6 +423,8 @@ 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:
@ -594,6 +598,8 @@ 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: