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Date: Thu, 3 Nov 2016 12:05:22 -0600
From: Kees Cook <>
To: Jann Horn <>
Cc: Lafcadio Wluiki <>, LKML <>, 
	Andrew Morton <>, 
	"" <>, 
	linux-arch <>
Subject: Re: [PATCH 2/2] procfs/tasks: add a simple per-task procfs hidepid= field

On Thu, Nov 3, 2016 at 11:55 AM, Jann Horn <> wrote:
> On Thu, Nov 03, 2016 at 10:12:55AM -0600, Kees Cook wrote:
>> On Thu, Nov 3, 2016 at 9:30 AM, Lafcadio Wluiki <> wrote:
>> > (Third, rebased submission, since first two submissions yielded no replies.)
>> >
>> > This adds a new per-task hidepid= flag that is honored by procfs when
>> > presenting /proc to the user, in addition to the existing hidepid= mount
>> > option. So far, hidepid= was exclusively a per-pidns setting. Locking
>> > down a set of processes so that they cannot see other user's processes
>> > without affecting the rest of the system thus currently requires
>> > creation of a private PID namespace, with all the complexity it brings,
>> > including maintaining a stub init process as PID 1 and losing the
>> > ability to see processes of the same user on the rest of the system.
> [...]
>> Since this adds a new prctl interface, it's best to Cc linux-arch
>> (which I added now).
> Please also CC linux-api for the next iteration, since this is a new
> userspace-facing API.

Oops, thank you. I meant linux-api, not linux-arch. :P


Kees Cook
Nexus Security

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