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Message-Id: <1366926860-26776-7-git-send-email-keescook@chromium.org>
Date: Thu, 25 Apr 2013 14:54:20 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
x86@...nel.org, Jarkko Sakkinen <jarkko.sakkinen@...el.com>,
Matthew Garrett <mjg@...hat.com>,
Matt Fleming <matt.fleming@...el.com>,
Eric Northup <digitaleric@...gle.com>,
Dan Rosenberg <drosenberg@...curity.com>,
Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>,
Kees Cook <keescook@...omium.org>
Subject: [PATCH 6/6] x86: kaslr: report kernel offset on panic
When the system panics, include the kernel offset in the report to assist
in debugging.
Signed-off-by: Kees Cook <keescook@...omium.org>
---
arch/x86/kernel/setup.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index fae9134..95a33b1 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -830,6 +830,18 @@ static void __init trim_low_memory_range(void)
}
/*
+ * Dump out kernel offset information on panic.
+ */
+static int
+dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
+{
+ pr_emerg("Kernel Offset: 0x%lx\n",
+ (unsigned long)&_text - __START_KERNEL);
+
+ return 0;
+}
+
+/*
* Determine if we were loaded by an EFI loader. If so, then we have also been
* passed the efi memmap, systab, etc., so we should use these data structures
* for initialization. Note, the efi init code path is determined by the
@@ -1249,3 +1261,15 @@ void __init i386_reserve_resources(void)
}
#endif /* CONFIG_X86_32 */
+
+static struct notifier_block kernel_offset_notifier = {
+ .notifier_call = dump_kernel_offset
+};
+
+static int __init register_kernel_offset_dumper(void)
+{
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &kernel_offset_notifier);
+ return 0;
+}
+__initcall(register_kernel_offset_dumper);
--
1.7.9.5
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