linux-kernel - Re: [PATCH v2 1/2] x86: introduce kaslr

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Message-ID: <20150428155958.GG19025@pd.tnic>
Date:	Tue, 28 Apr 2015 17:59:58 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	x86@...nel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Seth Jennings <sjenning@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>, linux-kernel@...r.kernel.org,
	live-patching@...r.kernel.org
Subject: Re: [PATCH v2 1/2] x86: introduce kaslr_offset()

On Tue, Apr 28, 2015 at 05:57:14PM +0200, Jiri Kosina wrote:
> On Tue, 28 Apr 2015, Jiri Kosina wrote:
> 
> > Offset that has been chosen for kaslr during kernel decompression can be 
> > easily computed as a difference between _text and __START_KERNEL. We are 
> > already making use of this in dump_kernel_offset() notifier and in 
> > arch_crash_save_vmcoreinfo().
> > 
> > Introduce kaslr_offset() that makes this computation instead of 
> > hard-coding it, so that other kernel code (such as live patching) can make 
> > use of it. Also convert existing users to make use of it.
> > 
> > Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> > ---
> > 
> > It'd be great to potentially have Ack from x86 guys for this patch so that 
> > I could take it through livepatching.git with the depending 2/2 patch. 
> > Thanks.
> > 
> > v1 -> v2: convert arch_crash_save_vmcoreinfo(), as spotted by Josh 
> > 	  Poimboeuf.
> 
> FWIW this patch is equivalent transofrmation without any effects on the 
> resulting code:
> 
> 	$ diff -u vmlinux.old.asm vmlinux.new.asm
> 	--- vmlinux.old.asm     2015-04-28 17:55:19.520983368 +0200
> 	+++ vmlinux.new.asm     2015-04-28 17:55:24.141206072 +0200
> 	@@ -1,5 +1,5 @@
> 	 
> 	-vmlinux.old:     file format elf64-x86-64
> 	+vmlinux.new:     file format elf64-x86-64
> 	 
> 	 
> 	 Disassembly of section .text:
> 	$

Then those are easy. Please add that piece of infomation to the commit
message.

With that:

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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