linux-kernel - Re: [PATCH 4/7] x86, kaslr: select random base offset

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Message-ID: <CAGXu5jJQQzWbRRWzHw_ZVuz2u8yAyON+-iECeskAEE_Y8Dqi8g@mail.gmail.com>
Date:	Tue, 1 Oct 2013 14:18:22 -0700
From:	Kees Cook <keescook@...omium.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Eric Northup <digitaleric@...gle.com>,
	Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...gle.com>,
	Mathias Krause <minipli@...glemail.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH 4/7] x86, kaslr: select random base offset

On Tue, Oct 1, 2013 at 1:46 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 10/01/2013 12:37 PM, Kees Cook wrote:
>> +
>> +#include <asm/archrandom.h>
>> +static inline int rdrand(unsigned long *v)
>> +{
>> +     int ok;
>> +     asm volatile("1: " RDRAND_LONG "\n\t"
>> +                  "jc 2f\n\t"
>> +                  "decl %0\n\t"
>> +                  "jnz 1b\n\t"
>> +                  "2:"
>> +                  : "=r" (ok), "=a" (*v)
>> +                  : "0" (RDRAND_RETRY_LOOPS));
>> +     return ok;
>> +}
>> +
>
> This looks just like rdrand_long() in arch/x86/kernel/cpu/rdrand.c and
> could move into the header file, no?

Yes, good idea. I'll move it into archrandom.h instead of this copy/paste.

-Kees

-- 
Kees Cook
Chrome OS Security
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