linux-kernel - Re: [PATCH 3/4] security: capabilities patch (version 0.4.4), part 3/4: introduce new capabilities

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Message-ID: <Pine.LNX.4.61.0609110807250.14570@yvahk01.tjqt.qr>
Date:	Mon, 11 Sep 2006 08:10:17 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	David Madore <david.madore@....fr>
cc:	Joshua Brindle <method@...too.org>,
	Linux Kernel mailing-list <linux-kernel@...r.kernel.org>,
	LSM mailing-list <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 3/4] security: capabilities patch (version 0.4.4), part
 3/4: introduce new capabilities


>> To expand on this a little, some of the capabilities you are looking to 
>> add are of very little if any use without being able to specify objects. 
>> For example, CAP_REG_OPEN is whether the process can open any file 
>> instead of specific ones. How many applications open no files whatsoever 
>> in practice? Even if there are some as soon as they change and need to 
>> open a file they'll need this capability and will be able to open any. 
>> CAP_REG_WRITE has the same problem. For a description of why 
>> CAP_REG_EXEC is meaningless see the digsig thread on the LSM list from 
>> earlier this year.
>
>CAP_REG_OPEN and CAP_REG_EXEC might be useful only for demonstration
>purposes, but I've *often* wished I could run a program without

You cannot reasonable run a program without CAP_REG_OPEN, because 
ld.so, libc.so and libdl.so all may load a ton of required files 
underneath you.

$ strace -e open ls 2>&1 >/dev/null | grep open | wc -l
36



Jan Engelhardt
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