linux-kernel - [PATCH 3.2 41/87] x86/boot: Double BOOT_HEAP

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Date:	Mon, 08 Feb 2016 23:53:51 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Peter Zijlstra" <peterz@...radead.org>,
	"Ingo Molnar" <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	"Borislav Petkov" <bp@...en8.de>,
	"Brian Gerst" <brgerst@...il.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H.J. Lu" <hjl.tools@...il.com>,
	"Denys Vlasenko" <dvlasenk@...hat.com>,
	"Andy Lutomirski" <luto@...capital.net>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH 3.2 41/87] x86/boot: Double BOOT_HEAP_SIZE to 64KB

3.2.77-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "H.J. Lu" <hjl.tools@...il.com>

commit 8c31902cffc4d716450be549c66a67a8a3dd479c upstream.

When decompressing kernel image during x86 bootup, malloc memory
for ELF program headers may run out of heap space, which leads
to system halt.  This patch doubles BOOT_HEAP_SIZE to 64KB.

Tested with 32-bit kernel which failed to boot without this patch.

Signed-off-by: H.J. Lu <hjl.tools@...il.com>
Acked-by: H. Peter Anvin <hpa@...or.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/include/asm/boot.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/include/asm/boot.h
+++ b/arch/x86/include/asm/boot.h
@@ -32,7 +32,7 @@
 #define BOOT_HEAP_SIZE             0x400000
 #else /* !CONFIG_KERNEL_BZIP2 */
 
-#define BOOT_HEAP_SIZE	0x8000
+#define BOOT_HEAP_SIZE	0x10000
 
 #endif /* !CONFIG_KERNEL_BZIP2 */