Patch "metag: copy_from_user() should zero the destination on access_ok() failure" has been added to the 4.7-stable tree

Patch "metag: copy_from_user() should zero the destination on access_ok() failure" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    metag: copy_from_user() should zero the destination on access_ok() failure

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     metag-copy_from_user-should-zero-the-destination-on-access_ok-failure.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 8ae95ed4ae5fc7c3391ed668b2014c9e2079533b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 18 Aug 2016 22:08:20 -0400
Subject: metag: copy_from_user() should zero the destination on access_ok() failure

From: Al Viro <viro@zeniv.linux.org.uk>

commit 8ae95ed4ae5fc7c3391ed668b2014c9e2079533b upstream.

Acked-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/metag/include/asm/uaccess.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/metag/include/asm/uaccess.h
+++ b/arch/metag/include/asm/uaccess.h
@@ -204,8 +204,9 @@ extern unsigned long __must_check __copy
 static inline unsigned long
 copy_from_user(void *to, const void __user *from, unsigned long n)
 {
-	if (access_ok(VERIFY_READ, from, n))
+	if (likely(access_ok(VERIFY_READ, from, n)))
 		return __copy_user_zeroing(to, from, n);
+	memset(to, 0, n);
 	return n;
 }
 


Patches currently in stable-queue which might be from viro@zeniv.linux.org.uk are

queue-4.7/nios2-copy_from_user-should-zero-the-tail-of-destination.patch
queue-4.7/m32r-fix-__get_user.patch
queue-4.7/microblaze-fix-copy_from_user.patch
queue-4.7/cris-buggered-copy_from_user-copy_to_user-clear_user.patch
queue-4.7/asm-generic-make-copy_from_user-zero-the-destination-properly.patch
queue-4.7/metag-copy_from_user-should-zero-the-destination-on-access_ok-failure.patch
queue-4.7/score-fix-__get_user-get_user.patch
queue-4.7/parisc-fix-copy_from_user.patch
queue-4.7/mips-copy_from_user-must-zero-the-destination-on-access_ok-failure.patch
queue-4.7/alpha-fix-copy_from_user.patch
queue-4.7/mn10300-failing-__get_user-and-get_user-should-zero.patch
queue-4.7/openrisc-fix-copy_from_user.patch
queue-4.7/avr32-fix-copy_from_user.patch
queue-4.7/score-fix-copy_from_user-and-friends.patch
queue-4.7/sh64-failing-__get_user-should-zero.patch
queue-4.7/arc-uaccess-get_user-to-zero-out-dest-in-cause-of-fault.patch
queue-4.7/hexagon-fix-strncpy_from_user-error-return.patch
queue-4.7/af_unix-split-u-readlock-into-two-iolock-and-bindlock.patch
queue-4.7/frv-fix-clear_user.patch
queue-4.7/fix-minor-infoleak-in-get_user_ex.patch
queue-4.7/asm-generic-make-get_user-clear-the-destination-on-errors.patch
queue-4.7/mn10300-copy_from_user-should-zero-on-access_ok-failure.patch
queue-4.7/s390-get_user-should-zero-on-failure.patch
queue-4.7/microblaze-fix-__get_user.patch
queue-4.7/blackfin-fix-copy_from_user.patch
queue-4.7/fix-iov_iter_fault_in_readable.patch
queue-4.7/nios2-fix-__get_user.patch
queue-4.7/sh-fix-copy_from_user.patch