提交 03145beb 编写于 作者: D Dan Rosenberg 提交者: Linus Torvalds

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: NDan Rosenberg <drosenberg@vsecurity.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 b7952180
...@@ -241,6 +241,8 @@ long compat_sys_semctl(int first, int second, int third, void __user *uptr) ...@@ -241,6 +241,8 @@ long compat_sys_semctl(int first, int second, int third, void __user *uptr)
struct semid64_ds __user *up64; struct semid64_ds __user *up64;
int version = compat_ipc_parse_version(&third); int version = compat_ipc_parse_version(&third);
memset(&s64, 0, sizeof(s64));
if (!uptr) if (!uptr)
return -EINVAL; return -EINVAL;
if (get_user(pad, (u32 __user *) uptr)) if (get_user(pad, (u32 __user *) uptr))
...@@ -421,6 +423,8 @@ long compat_sys_msgctl(int first, int second, void __user *uptr) ...@@ -421,6 +423,8 @@ long compat_sys_msgctl(int first, int second, void __user *uptr)
int version = compat_ipc_parse_version(&second); int version = compat_ipc_parse_version(&second);
void __user *p; void __user *p;
memset(&m64, 0, sizeof(m64));
switch (second & (~IPC_64)) { switch (second & (~IPC_64)) {
case IPC_INFO: case IPC_INFO:
case IPC_RMID: case IPC_RMID:
...@@ -594,6 +598,8 @@ long compat_sys_shmctl(int first, int second, void __user *uptr) ...@@ -594,6 +598,8 @@ long compat_sys_shmctl(int first, int second, void __user *uptr)
int err, err2; int err, err2;
int version = compat_ipc_parse_version(&second); int version = compat_ipc_parse_version(&second);
memset(&s64, 0, sizeof(s64));
switch (second & (~IPC_64)) { switch (second & (~IPC_64)) {
case IPC_RMID: case IPC_RMID:
case SHM_LOCK: case SHM_LOCK:
......
...@@ -53,6 +53,9 @@ asmlinkage long compat_sys_mq_open(const char __user *u_name, ...@@ -53,6 +53,9 @@ asmlinkage long compat_sys_mq_open(const char __user *u_name,
void __user *p = NULL; void __user *p = NULL;
if (u_attr && oflag & O_CREAT) { if (u_attr && oflag & O_CREAT) {
struct mq_attr attr; struct mq_attr attr;
memset(&attr, 0, sizeof(attr));
p = compat_alloc_user_space(sizeof(attr)); p = compat_alloc_user_space(sizeof(attr));
if (get_compat_mq_attr(&attr, u_attr) || if (get_compat_mq_attr(&attr, u_attr) ||
copy_to_user(p, &attr, sizeof(attr))) copy_to_user(p, &attr, sizeof(attr)))
...@@ -127,6 +130,8 @@ asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes, ...@@ -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)); struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p));
long ret; long ret;
memset(&mqstat, 0, sizeof(mqstat));
if (u_mqstat) { if (u_mqstat) {
if (get_compat_mq_attr(&mqstat, u_mqstat) || if (get_compat_mq_attr(&mqstat, u_mqstat) ||
copy_to_user(p, &mqstat, sizeof(mqstat))) copy_to_user(p, &mqstat, sizeof(mqstat)))
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册