linux-kernel - [09/44] ipc: initialize structure memory to zero for compat functions

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Message-Id: <20101208000640.422863576@clark.site>
Date:	Tue, 07 Dec 2010 16:04:08 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dan Rosenberg <drosenberg@...curity.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [09/44] ipc: initialize structure memory to zero for compat functions

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dan Rosenberg <drosenberg@...curity.com>

commit 03145beb455cf5c20a761e8451e30b8a74ba58d9 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@...curity.com>
Cc: Manfred Spraul <manfred@...orfullife.com>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 ipc/compat.c    |    6 ++++++
 ipc/compat_mq.c |    5 +++++
 2 files changed, 11 insertions(+)

--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -242,6 +242,8 @@ 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))
@@ -422,6 +424,8 @@ 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:
@@ -595,6 +599,8 @@ 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:
--- a/ipc/compat_mq.c
+++ b/ipc/compat_mq.c
@@ -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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