linux-kernel - [PATCH 2/6] a bug that relocation can not be handled when kernel is loaded above 2G

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Message-Id: <1421811437-2787-3-git-send-email-bhe@redhat.com>
Date:	Wed, 21 Jan 2015 11:37:13 +0800
From:	Baoquan He <bhe@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	x86@...nel.org, keescook@...omium.org, vgoyal@...hat.com,
	whissi@...ssi.de, Baoquan He <bhe@...hat.com>
Subject: [PATCH 2/6] a bug that relocation can not be handled when kernel is loaded above 2G

When process 32 bit relocation a local variable extended is defined
to calculate the physical address of relocs entry. However its data
type is int which is enough for i386, but not for x86_64. That's why
relocation can only be handled when kernel is loaded below 2G,
otherwise a overflow will happen and cause system hang.

Here change it to long as 32 bit inverse relocation processing does,
and this change is safe for i386 relocation handling.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/boot/compressed/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index dcc1c53..324ccb5 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -278,7 +278,7 @@ static void handle_relocations(void *output, unsigned long output_len)
 	 * So we work backwards from the end of the decompressed image.
 	 */
 	for (reloc = output + output_len - sizeof(*reloc); *reloc; reloc--) {
-		int extended = *reloc;
+		long extended = *reloc;
 		extended += map;
 
 		ptr = (unsigned long)extended;
-- 
1.9.3

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