linux-kernel - Re: [PATCH RFC v3 6/7] proc: support new 'pids=all|ptraceable' mount option

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Date:   Fri, 10 Nov 2017 13:56:18 +1100 (AEDT)
From:   James Morris <james.l.morris@...cle.com>
To:     Djalal Harouni <tixxdz@...il.com>
cc:     Kees Cook <keescook@...omium.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com,
        linux-security-module@...r.kernel.org, linux-api@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Akinobu Mita <akinobu.mita@...il.com>, me@...in.cc,
        Oleg Nesterov <oleg@...hat.com>,
        Jeff Layton <jlayton@...chiereds.net>,
        Ingo Molnar <mingo@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>, ebiederm@...ssion.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Daniel Micay <danielmicay@...il.com>,
        Jonathan Corbet <corbet@....net>, bfields@...ldses.org,
        Stephen Rothwell <sfr@...b.auug.org.au>, solar@...nwall.com
Subject: Re: [PATCH RFC v3 6/7] proc: support new 'pids=all|ptraceable' mount
 option

On Thu, 9 Nov 2017, Djalal Harouni wrote:

> This patch introduces the new 'pids' mount option, as it was discussed
> and suggested by Andy Lutomirski [1].
> 
> * If 'pids=' is passed without 'newinstance' then it has no effect.
> 
> * If 'newinstance,pids=all' then all processes will be shown in proc.
> 
> * If 'newinstance,pids=ptraceable' then only ptraceable processes will be
> shown.
> 
> * 'pids=' takes precendence over 'hidepid=' since 'hidepid=' can be
>   ignored if "gid=" was set and caller has the "gid=" set in its groups.
>   We want to guarantee that LSM have a security path there that can not
>   be disabled with "gid=".
> 
> This allows to support lightweight sandboxes in Embedded Linux.
> 
> Later Yama LSM can be updated to check that processes are able only
> able to see their children inside /proc/, allowing to support more tight
> cases.
> 
> [1] https://lkml.org/lkml/2017/4/26/646
> 
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Suggested-by: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Alexey Gladkov <gladkov.alexey@...il.com>
> Signed-off-by: Djalal Harouni <tixxdz@...il.com>


Reviewed-by: James Morris <james.l.morris@...cle.com>


-- 
James Morris
<james.l.morris@...cle.com>