linux-kernel - Re: [PATCH] i386 and x86

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Message-ID: <46D6E32F.30204@gmail.com>
Date:	Thu, 30 Aug 2007 17:33:03 +0200
From:	Franck Bui-Huu <vagabon.xyz@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	Mike Frysinger <vapier.adi@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386 and x86_64: randomize brk()

Jiri Kosina wrote:
> On Thu, 30 Aug 2007, Mike Frysinger wrote:
> 
>> Blackfin too please :) i think v850 also falls into this category, but 
>> i'm not terribly familiar with it ...
> 
> Andrew, do you still strongly oppose to having ARCH_HAS_RANDOMIZE_BRK 
> macro instead please?
> 

you might want to use a weak function instead ?

void __weak arch_randomize_brk(void)
{
	/* nada by default */
}

and overload it only for x86 architectures by now.

BTW, how about minimize the arch specific code by slighly changing its
prototype  ?

unsigned long arch_randomize_brk(struct mm_struct *mm)
{
	unsigned long range_end = mm->brk + 0x02000000;
	
	return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
}

		Franck
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