linux-kernel - [PATCH] x86, kaslr: export offset in VMCOREINFO ELF notes

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Message-ID: <20140122235615.GA21632@www.outflux.net>
Date:	Wed, 22 Jan 2014 15:56:15 -0800
From:	Kees Cook <keescook@...omium.org>
To:	crash-utility@...hat.com
Cc:	linux-kernel@...r.kernel.org, Dave Anderson <anderson@...hat.com>,
	Andrew Honig <ahonig@...gle.com>,
	Eugene Surovegin <surovegin@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] x86, kaslr: export offset in VMCOREINFO ELF notes

Include kASLR offset in VMCOREINFO ELF notes to assist in debugging.

Signed-off-by: Eugene Surovegin <surovegin@...gle.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/x86/kernel/machine_kexec_64.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 4eabc160696f..679cef0791cd 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -279,5 +279,7 @@ void arch_crash_save_vmcoreinfo(void)
 	VMCOREINFO_SYMBOL(node_data);
 	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
 #endif
+	vmcoreinfo_append_str("KERNELOFFSET=%lx\n",
+			      (unsigned long)&_text - __START_KERNEL);
 }
 
-- 
1.7.9.5

-- 
Kees Cook
Chrome OS Security
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