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From: Arvid Brodin <Arvid.Brodin@xdin.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	"Cyrill Gorcunov" <gorcunov@openvz.org>,
	David Rientjes <rientjes@google.com>
Subject: Re: fs/proc/base.c: text md5sums; tgid vs tid; and INF vs ONE?
Date: Thu, 1 Nov 2012 20:29:25 +0000	[thread overview]
Message-ID: <5092DBA4.3070707@xdin.com> (raw)
In-Reply-To: <87ip9refzk.fsf@xmission.com>

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On 2012-10-30 23:45, Eric W. Biederman wrote:
> Arvid Brodin <Arvid.Brodin@xdin.com> writes:
>> Hi,
>> []

Thanks for the info!

>> * Any other comments about the code?
> 
> There are known successful attacks against md5 so using md5 for
> something new and security related is a bad idea.
> 
> Userspace can just as easily compute a security hash itself you don't
> need kernel support.

How would I do this on running code? Does the kernel export the process memory somewhere
so that I can pipe it to md5sum?


> I recommend you checkout the code in security/ima/ looks like it can
> already do what you are trying to do.

Ah. I did actually check this out a year and a half ago or something like that. Seems like
it has gotten a bit more capable since then with the new patches (immutable executables
etc)! I'll take a look at it again to see if it might fit our needs. Thanks!

> 
> Eric


-- 
Arvid Brodin | Consultant (Linux)
XDIN AB | Knarrarnäsgatan 7 | SE-164 40 Kista | Sweden | xdin.comÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

  reply	other threads:[~2012-11-01 20:29 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-30 21:02 fs/proc/base.c: text md5sums; tgid vs tid; and INF vs ONE? Arvid Brodin
2012-10-30 21:22 ` Al Viro
2012-11-01 20:22   ` Arvid Brodin
2012-10-30 21:23 ` Cyrill Gorcunov
2012-10-30 22:45 ` Eric W. Biederman
2012-11-01 20:29   ` Arvid Brodin [this message]
2012-11-02 22:49     ` Arvid Brodin

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