linux-kernel - Re: fs/proc/base.c: text md5sums; tgid vs tid; and INF vs ONE?

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Message-ID: <5092DBA4.3070707@xdin.com>
Date:	Thu, 1 Nov 2012 20:29:25 +0000
From:	Arvid Brodin <Arvid.Brodin@...n.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Cyrill Gorcunov" <gorcunov@...nvz.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: fs/proc/base.c: text md5sums; tgid vs tid; and INF vs ONE?

On 2012-10-30 23:45, Eric W. Biederman wrote:
> Arvid Brodin <Arvid.Brodin@...n.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)
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