Messages in this thread Patch in this message | | | Subject | [PATCH v3] IPC: Initialize structure memory to zero for compat functions | From | Dan Rosenberg <> | Date | Wed, 06 Oct 2010 22:34:41 -0400 |
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Updated to include compat shmctl() structs. Now using memset().
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>
diff -urp linux-2.6.35.5.orig/ipc/compat.c linux-2.6.35.5/ipc/compat.c --- linux-2.6.35.5.orig/ipc/compat.c 2010-09-20 16:59:09.000000000 -0400 +++ linux-2.6.35.5/ipc/compat.c 2010-10-06 22:17:21.000000000 -0400 @@ -241,6 +241,8 @@ long compat_sys_semctl(int first, int se 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 se 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 se 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: diff -urp linux-2.6.35.5.orig/ipc/compat_mq.c linux-2.6.35.5/ipc/compat_mq.c --- linux-2.6.35.5.orig/ipc/compat_mq.c 2010-09-20 16:59:09.000000000 -0400 +++ linux-2.6.35.5/ipc/compat_mq.c 2010-10-06 22:15:32.000000000 -0400 @@ -53,6 +53,9 @@ asmlinkage long compat_sys_mq_open(const 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 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)))
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