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Message-ID: <20111107192915.GA4690@albatros> Date: Mon, 7 Nov 2011 23:29:15 +0400 From: Vasiliy Kulikov <segoon@...nwall.com> To: kernel-hardening@...ts.openwall.com Cc: Valdis.Kletnieks@...edu, linux-kernel@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-security-module@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: Re: [PATCH] proc: restrict access to /proc/interrupts On Mon, Nov 07, 2011 at 11:18 -0800, H. Peter Anvin wrote: > On 11/07/2011 11:01 AM, Vasiliy Kulikov wrote: > > > > What's wrong with old good DAC? You can create a group "sysinfo", do > > "chown sysinfo /proc/interrupts", and add the permitted users to the > > group. If you need to give different access levels to different interrupts, > > you need another /proc/interrupts design, it does nothing with DAC vs. LSM. > > > > I would like to propose that we add a mount option to procfs, and > possibly sysfs, called, say, admingrp. Similar proposals: (procfs for /proc/$PID/* permissions, sorry about different threads) https://lkml.org/lkml/2011/6/15/172 https://lkml.org/lkml/2011/6/15/174 https://lkml.org/lkml/2011/6/15/173 https://lkml.org/lkml/2011/6/15/177 https://lkml.org/lkml/2011/6/15/175 https://lkml.org/lkml/2011/6/15/176 (change uid/gid for newly created sysfs objects) https://lkml.org/lkml/2011/5/18/272 As to procfs, I see no real need of adding mode/group mount option for global procfs files (/proc/interrupts, /proc/stat, etc.) - it can be done by distro specific init scripts (chown+chmod). I don't mind against such an option for the convenience, though. > The current Linux trend seems to be do instead force those users to > become root constantly, which is *not* helping the situation. Agreed. Thanks, -- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments
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