linux-kernel - Re: [PATCH] cpumask: alloc blank cpumask left over

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4A28AAA1.1060203@redhat.com>
Date:	Fri, 05 Jun 2009 08:18:25 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpumask: alloc blank cpumask left over

Rusty Russell wrote:
> On Fri, 5 Jun 2009 06:31:31 am Yinghai Lu wrote:
>   
>> avoid suprise when MAXSMP is enabled
>>
>> Signed-off-by: Yinghai Lu <yinghai.lu@...nel.org>
>>     
>
> I understand the temptation, but two questions arise:
> 1) Shouldn't we actually audit to see if any of these are currently problems, 
> and
> 2) Should the non-MAXSMP alloc_cpumask_var_node (currently a noop) zero the 
> mask if __GFP_ZERO is set?
>   

If we go that route we should conditionally clear the bitmaps in 
alloc_cpumask_var().  I don't think we do, though.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/