From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Fri, 7 Sep 2012 17:22:28 +0000 (+0100)
Subject: ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS
X-Git-Tag: v3.2.54~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5c70f452589114e6a551803bf312eed1b57f964;p=pandora-kernel.git

ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS

commit 8404663f81d212918ff85f493649a7991209fa04 upstream.

The {get,put}_user macros don't perform range checking on the provided
__user address when !CPU_HAS_DOMAINS.

This patch reworks the out-of-line assembly accessors to check the user
address against a specified limit, returning -EFAULT if is is out of
range.

[will: changed get_user register allocation to match put_user]
[rmk: fixed building on older ARM architectures]

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[bwh: Backported to 3.2: TUSER() was called T()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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