Patchwork [3.5.yuz,extended,stable] Patch "use clamp_t in UNAME26 fix" has been added to staging queue

login
register
mail settings
Submitter Herton Ronaldo Krzesinski
Date Nov. 21, 2012, 5:09 a.m.
Message ID <1353474582-9396-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/200574/
State New
Headers show

Comments

Herton Ronaldo Krzesinski - Nov. 21, 2012, 5:09 a.m.
This is a note to let you know that I have just added a patch titled

    use clamp_t in UNAME26 fix

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

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

For more information about the 3.5.yuz tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From f6a6ce7fd46533cfdf3bcd781143479b71fb119c Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Fri, 19 Oct 2012 18:45:53 -0700
Subject: [PATCH] use clamp_t in UNAME26 fix

commit 31fd84b95eb211d5db460a1dda85e004800a7b52 upstream.

The min/max call needed to have explicit types on some architectures
(e.g. mn10300). Use clamp_t instead to avoid the warning:

  kernel/sys.c: In function 'override_release':
  kernel/sys.c:1287:10: warning: comparison of distinct pointer types lacks a cast [enabled by default]

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 kernel/sys.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
1.7.9.5

Patch

diff --git a/kernel/sys.c b/kernel/sys.c
index 1b66408..b6fe559 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1284,7 +1284,7 @@  static int override_release(char __user *release, size_t len)
 			rest++;
 		}
 		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
-		copy = min(sizeof(buf), max_t(size_t, 1, len));
+		copy = clamp_t(size_t, len, 1, sizeof(buf));
 		copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
 		ret = copy_to_user(release, buf, copy + 1);
 	}