linux-kernel - [PATCH 15/33] x86_64: Fix kernel direct mapping size check

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Message-Id: <11544302382314-git-send-email-ebiederm@xmission.com>
Date:	Tue,  1 Aug 2006 05:03:30 -0600
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	<fastboot@...l.org>
Cc:	<linux-kernel@...r.kernel.org>, Horms <horms@...ge.net.au>,
	Jan Kratochvil <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 15/33] x86_64: Fix kernel direct mapping size check

Instead of using physical addresse of _end which has nothing to
do with knowing if the kernel fits within it's reserved
virtual addresses, verify the virtual address of _end fits
within in the kernel virtual address mapping.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 arch/x86_64/kernel/head64.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c
index 36647ce..454498c 100644
--- a/arch/x86_64/kernel/head64.c
+++ b/arch/x86_64/kernel/head64.c
@@ -116,7 +116,7 @@ #ifdef CONFIG_X86_IO_APIC
 		disable_apic = 1;
 #endif
 	/* You need early console to see that */
-	if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
+	if (((unsigned long)&_end) >= (__START_KERNEL_map + KERNEL_TEXT_SIZE))
 		panic("Kernel too big for kernel mapping\n");
 
 	setup_boot_cpu_data();
-- 
1.4.2.rc2.g5209e

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