linux-kernel - [tip:x86/mm-v2] x86-32: make sure virt_addr_valid() returns false for fixmap addresses

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Message-ID: <tip-0feca851c1b3cb4ebfa3149144b3d5de0879ebaa@git.kernel.org>
Date:	Sun, 8 Mar 2009 19:27:30 GMT
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	yinghai@...nel.org, jirislaby@...il.com,
	jeremy.fitzhardinge@...rix.com, jeremy@...p.org,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/mm-v2] x86-32: make sure virt_addr_valid() returns false for fixmap addresses

Commit-ID:  0feca851c1b3cb4ebfa3149144b3d5de0879ebaa
Gitweb:     http://git.kernel.org/tip/0feca851c1b3cb4ebfa3149144b3d5de0879ebaa
Author:     "Jeremy Fitzhardinge" <jeremy@...p.org>
AuthorDate: Fri, 6 Mar 2009 10:09:26 -0800
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 8 Mar 2009 20:03:52 +0100

x86-32: make sure virt_addr_valid() returns false for fixmap addresses

I found that virt_addr_valid() was returning true for fixmap addresses.

I'm not sure whether pfn_valid() is supposed to include this test,
but there's no harm in being explicit.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Jiri Slaby <jirislaby@...il.com>
Cc: Yinghai Lu <yinghai@...nel.org>
LKML-Reference: <49B166D6.2080505@...p.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/mm/ioremap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 62773ab..62def57 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -87,6 +87,8 @@ bool __virt_addr_valid(unsigned long x)
 		return false;
 	if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
 		return false;
+	if (x >= FIXADDR_START)
+		return false;
 	return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
 }
 EXPORT_SYMBOL(__virt_addr_valid);
--
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