[Crash-utility] [PATCH v2] x86, kaslr: export offset in VMCOREINFO ELF notes

[Kees Cook]

From: Eugene Surovegin <surovegin at google.com>

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

Signed-off-by: Eugene Surovegin <surovegin at google.com>
Signed-off-by: Kees Cook <keescook at chromium.org>
---
v2:
 - make sure "From:" got sent correctly
---
 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