From: Nicolas Pitre <nico@cam.org>
Date: Sat, 25 Mar 2006 22:44:05 +0000 (+0000)
Subject: [ARM] 3030/2: fix permission check in the obscur cmpxchg syscall
X-Git-Tag: v2.6.17-rc1~661^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ce9804fbd9d4da75fb5bb53331b46b614a7d5c3;p=pandora-kernel.git

[ARM] 3030/2: fix permission check in the obscur cmpxchg syscall

Patch from Nicolas Pitre

Quoting RMK:

|pte_write() just says that the page _may_ be writable. It doesn't say
|that the MMU is programmed to allow writes. If pte_dirty() doesn't
|return true, that means that the page is _not_ writable from userspace.
|If you write to it from kernel mode (without using put_user) you'll
|bypass the MMU read-only protection and may end up writing to a page
|owned by two separate processes.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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