This is a note to let you know that I've just added the patch titled
x86-64: Fix the failure case in copy_user_handle_tail()
to the 3.8-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:
x86-64-fix-the-failure-case-in-copy_user_handle_tail.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 66db3feb486c01349f767b98ebb10b0c3d2d021b Mon Sep 17 00:00:00 2001
From: CQ Tang <cq.tang@xxxxxxxxx>
Date: Mon, 18 Mar 2013 11:02:21 -0400
Subject: x86-64: Fix the failure case in copy_user_handle_tail()
From: CQ Tang <cq.tang@xxxxxxxxx>
commit 66db3feb486c01349f767b98ebb10b0c3d2d021b upstream.
The increment of "to" in copy_user_handle_tail() will have incremented
before a failure has been noted. This causes us to skip a byte in the
failure case.
Only do the increment when assured there is no failure.
Signed-off-by: CQ Tang <cq.tang@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20130318150221.8439.993.stgit@xxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/lib/usercopy_64.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/lib/usercopy_64.c
+++ b/arch/x86/lib/usercopy_64.c
@@ -74,10 +74,10 @@ copy_user_handle_tail(char *to, char *fr
char c;
unsigned zero_len;
- for (; len; --len) {
+ for (; len; --len, to++) {
if (__get_user_nocheck(c, from++, sizeof(char)))
break;
- if (__put_user_nocheck(c, to++, sizeof(char)))
+ if (__put_user_nocheck(c, to, sizeof(char)))
break;
}
Patches currently in stable-queue which might be from cq.tang@xxxxxxxxx are
queue-3.8/x86-64-fix-the-failure-case-in-copy_user_handle_tail.patch
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