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]

Date:	Sun, 15 Sep 2013 01:58:42 -0700
From:	Christian Kujau <lists@...dbynature.de>
To:	Vasiliy Kulikov <segoon@...nwall.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: proc hidepid=2 and SGID programs

Vasiliy Kulikov <segoon@...nwall.com> wrote:
>> But still, I wonder if this is 
>> intended behaviour.
>
>Yes.
>
>If you think such side channel attacks are something you don't care,
>just turn hidepid off.  That's why it is an option.
>
>If you want to turn it off for some users, use gid=XXX.

Maybe my initial question got lost in the noise: I merely wondered why "pgrep sgid-program" returned nothing but "kill pics off stiff program" was possible. Sure, if that's intended behavior, so be it. I just don't understand the (technical) reasoning behind this.

Thanks,
Christian.


--
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/