linux-kernel - Re: proc hidepid=2 and SGID programs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.11.1309100124020.6509@trent.utfs.org>
Date:	Tue, 10 Sep 2013 01:30:28 -0700 (PDT)
From:	Christian Kujau <lists@...dbynature.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: proc hidepid=2 and SGID programs

On Sun, 8 Sep 2013 at 23:42, Eric W. Biederman wrote:
> I don't have a clue why anyone would want to hide processes, and make
> their own lives more difficult.

Oh, there are plenty of usescases, I'm sure. And I for one am thankful 
that this process hiding option made it into the kernel. Or, to answer in 
another way: why would anyone want to see other peoples processes?

> The check with hidepid is can you ptrace the process.  I expect there
> is something with those sgid processes that keeps you from ptracing
> them.

Indeed, I cannot strace the process. But still, I wonder if this is 
intended behaviour.
 
> Of course if you don't like the silly behavior you can always disable
> it.

:-)

C.
-- 
BOFH excuse #412:

Radial Telemetry Infiltration
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/