linux-kernel - Re: [PATCH v2] x86, kaslr: export offset in VMCOREINFO ELF notes

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Message-ID: <CAGXu5jK0UK5Aj4henG2uZevrjj576JQp13ZRKGkgNMDV8BeQsw@mail.gmail.com>
Date:	Fri, 21 Feb 2014 12:25:27 -0800
From:	Kees Cook <keescook@...omium.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	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>,
	"x86@...nel.org" <x86@...nel.org>, Yinghai Lu <yinghai@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] x86, kaslr: export offset in VMCOREINFO ELF notes

On Thu, Jan 23, 2014 at 9:31 AM, Kees Cook <keescook@...omium.org> wrote:
> From: Eugene Surovegin <surovegin@...gle.com>
>
> 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>
> ---
> 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

Ping on this patch. The crash-utils folks would like to be using this feature.

-Kees

-- 
Kees Cook
Chrome OS Security
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