linux-kernel - Re: [RFC 2/2] prctl: PR_SET_MM -- Introduce PR_SET_MM

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] [day] [month] [year] [list]

Date:	Thu, 24 Jul 2014 22:50:13 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Andrew Vagin <avagin@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Julien Tinnes <jln@...gle.com>
Subject: Re: [RFC 2/2] prctl: PR_SET_MM -- Introduce PR_SET_MM_MAP operation

On Thu, Jul 24, 2014 at 11:44:50AM -0700, Kees Cook wrote:
...
> >
> > The file can have a suid bit, so after executing it we may lose ability
> > to attach to it. To check that we can check that uid and gid is zero
> > in a current userns (local root).
> >
> > What else do we need to check?
> 
> Yeah, I think all the checks are sufficient, but I (and Julien) are
> still trying to think about side-effects.
> 
> It would be nice if these checks (like the rlimit checks) were merged
> into some common helper. That way if something changes in the exec
> path, it won't go missed in the c/r path.

For rlimit I've done a separate helper in new rfc series, please take a look.
--
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/