From patchwork Mon Nov 26 16:59:10 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [260/270] fs/compat_ioctl.c: VIDEO_SET_SPU_PALETTE missing error check Date: Mon, 26 Nov 2012 06:59:10 -0000 From: Herton Ronaldo Krzesinski X-Patchwork-Id: 202023 Message-Id: <1353949160-26803-261-git-send-email-herton.krzesinski@canonical.com> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Brad Spengler , Kees Cook , PaX Team , Andrew Morton , Linus Torvalds , David Miller 3.5.7u1 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Kees Cook commit 12176503366885edd542389eed3aaf94be163fdb upstream. The compat ioctl for VIDEO_SET_SPU_PALETTE was missing an error check while converting ioctl arguments. This could lead to leaking kernel stack contents into userspace. Patch extracted from existing fix in grsecurity. Signed-off-by: Kees Cook Cc: David Miller Cc: Brad Spengler Cc: PaX Team Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Herton Ronaldo Krzesinski --- fs/compat_ioctl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index debdfe0..5d2069f 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -210,6 +210,8 @@ static int do_video_set_spu_palette(unsigned int fd, unsigned int cmd, err = get_user(palp, &up->palette); err |= get_user(length, &up->length); + if (err) + return -EFAULT; up_native = compat_alloc_user_space(sizeof(struct video_spu_palette)); err = put_user(compat_ptr(palp), &up_native->palette);