From: James Morris <james.l.morris@oracle.com>
To: Djalal Harouni <tixxdz@gmail.com>
Cc: Kees Cook <keescook@chromium.org>,
Alexey Gladkov <gladkov.alexey@gmail.com>,
Andy Lutomirski <luto@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Akinobu Mita <akinobu.mita@gmail.com>,
me@tobin.cc, Oleg Nesterov <oleg@redhat.com>,
Jeff Layton <jlayton@poochiereds.net>,
Ingo Molnar <mingo@kernel.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
ebiederm@xmission.com,
Linus Torvalds <torvalds@linux-foundation.org>,
Daniel Micay <danielmicay@gmail.com>,
Jonathan Corbet <corbet@lwn.net>,
bfields@fieldses.org, Stephen Rothwell <sfr@canb.auug.org.au>,
solar@openwall.com
Subject: Re: [PATCH RFC v3 6/7] proc: support new 'pids=all|ptraceable' mount option
Date: Fri, 10 Nov 2017 13:56:18 +1100 (AEDT) [thread overview]
Message-ID: <alpine.LFD.2.20.1711101356010.8844@localhost> (raw)
In-Reply-To: <1510244046-3256-7-git-send-email-tixxdz@gmail.com>
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@chromium.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Suggested-by: Andy Lutomirski <luto@kernel.org>
> Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com>
> Signed-off-by: Djalal Harouni <tixxdz@gmail.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
--
James Morris
<james.l.morris@oracle.com>
next prev parent reply other threads:[~2017-11-10 2:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-09 16:13 [PATCH RFC v3 0/7] proc: modernize proc to support multiple private instances Djalal Harouni
2017-11-09 16:14 ` [PATCH RFC v3 1/7] proc: add proc_fs_info struct to store proc information Djalal Harouni
2017-11-10 10:26 ` Alexey Dobriyan
2017-11-10 10:32 ` Djalal Harouni
2017-11-09 16:14 ` [PATCH RFC v3 2/7] proc: move /proc/{self|thread-self} dentries to proc_fs_info Djalal Harouni
2017-11-10 10:31 ` Alexey Dobriyan
2017-11-10 10:45 ` Djalal Harouni
2017-11-09 16:14 ` [PATCH RFC v3 3/7] proc: add helpers to set and get proc hidepid and gid mount options Djalal Harouni
2017-11-10 10:36 ` Alexey Dobriyan
2017-11-10 10:41 ` Djalal Harouni
2017-11-09 16:14 ` [PATCH RFC v3 4/7] proc: support mounting private procfs instances inside same pid namespace Djalal Harouni
2017-11-10 2:53 ` James Morris
2017-11-10 10:33 ` Djalal Harouni
2017-11-09 16:14 ` [PATCH RFC v3 5/7] proc: move hidepid definitions to proc files Djalal Harouni
2017-11-09 16:14 ` [PATCH RFC v3 6/7] proc: support new 'pids=all|ptraceable' mount option Djalal Harouni
2017-11-10 2:38 ` Andy Lutomirski
2017-11-10 10:38 ` Djalal Harouni
2017-11-10 2:56 ` James Morris [this message]
2017-11-09 16:14 ` [PATCH RFC v3 7/7] proc: flush dcache entries from all procfs instances Djalal Harouni
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