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Message-ID: <20111107201120.GA5775@albatros> Date: Tue, 8 Nov 2011 00:11:20 +0400 From: Vasiliy Kulikov <segoon@...nwall.com> To: "H. Peter Anvin" <hpa@...or.com> Cc: Eric Paris <eparis@...isplace.org>, kernel-hardening@...ts.openwall.com, 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 11:50 -0800, H. Peter Anvin wrote: > On 11/07/2011 11:48 AM, Eric Paris wrote: > > On Mon, Nov 7, 2011 at 2:29 PM, Vasiliy Kulikov <segoon@...nwall.com> wrote: > >> On Mon, Nov 07, 2011 at 11:18 -0800, H. Peter Anvin wrote: > > > >> 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. > > > > While possible, the chmod+chown 'solutions' just aren't as simple as > > you pretend. Every time one creates a chroot environment and mounts > > /proc it has be manually fixed there as well. Same thing with a > > container. Sure if /proc were something that was only ever mounted > > one time on a box it wouldn't be so bad, but that's not the case..... > > Yes, for a filesystem that dynamically creates nodes, a static script > just doesn't work well. Control options do, like we have for devpts for > example. My statement was about static files - /proc/{interrupts,meminfo,stat,cpuinfo}. They don't change during the system life. /proc/$PID/* files are indeed dymanic and the first link in my quoted email was about addition of such mount options. Thanks, -- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments
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