[3.16.y-ckt stable] Patch "USB: usbfs: don't leak kernel data in siginfo" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    USB: usbfs: don't leak kernel data in siginfo

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt9.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 16f872056f2a92f80b7332d91dc21d219a05ded9 Mon Sep 17 00:00:00 2001
From: Alan Stern <stern at rowland.harvard.edu>
Date: Fri, 13 Feb 2015 10:54:53 -0500
Subject: USB: usbfs: don't leak kernel data in siginfo

commit f0c2b68198589249afd2b1f2c4e8de8c03e19c16 upstream.

When a signal is delivered, the information in the siginfo structure
is copied to userspace.  Good security practice dicatates that the
unused fields in this structure should be initialized to 0 so that
random kernel stack data isn't exposed to the user.  This patch adds
such an initialization to the two places where usbfs raises signals.

Signed-off-by: Alan Stern <stern at rowland.harvard.edu>
Reported-by: Dave Mielke <dave at mielke.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/core/devio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 0b59731c3021..e500243803d8 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -501,6 +501,7 @@ static void async_completed(struct urb *urb)
 	as->status = urb->status;
 	signr = as->signr;
 	if (signr) {
+		memset(&sinfo, 0, sizeof(sinfo));
 		sinfo.si_signo = as->signr;
 		sinfo.si_errno = as->status;
 		sinfo.si_code = SI_ASYNCIO;
@@ -2371,6 +2372,7 @@ static void usbdev_remove(struct usb_device *udev)
 		wake_up_all(&ps->wait);
 		list_del_init(&ps->list);
 		if (ps->discsignr) {
+			memset(&sinfo, 0, sizeof(sinfo));
 			sinfo.si_signo = ps->discsignr;
 			sinfo.si_errno = EPIPE;
 			sinfo.si_code = SI_ASYNCIO;