linux-kernel - Re: [PATCH] Check files' signatures before doing suid/sgid [2/4]

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Message-ID: <20070621172557.GE9741@cip.informatik.uni-erlangen.de>
Date:	Thu, 21 Jun 2007 19:25:57 +0200
From:	Alexander Wuerstlein <snalwuer@....informatik.uni-erlangen.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Alexander Wuerstlein <arw@....name>, linux-kernel@...r.kernel.org,
	Johannes Schlumberger <spjsschl@...d.informatik.uni-erlangen.de>
Subject: Re: [PATCH] Check files' signatures before doing suid/sgid [2/4]

On 070621 19:21, Arjan van de Ven <arjan@...radead.org> wrote:
> On Thu, 2007-06-21 at 18:02 +0200, Alexander Wuerstlein wrote:
> > Modified task_struct to hold a 'signed flag' which is set on exec(), inherited
> > on fork() and checked during exec before giving the new process suid/sgid
> > privileges.
> > 
> 
> 
> 
> do you also check the signature of glibc and every other shared library
> that the app uses (or dlopens)? if not.. the entire exercise is rather
> pointless...

We do check that, that is patch [3/4].

Of course we can only check mmap-ed files, if there is no file like with JIT
compilers we are out of luck.

Ciao,

Alexander Wuerstlein.
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