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Date: Thu, 12 Jan 2012 19:37:07 -0600 From: Will Drewry <wad@...omium.org> To: Andrew Lutomirski <luto@....edu> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, keescook@...omium.org, john.johansen@...onical.com, serge.hallyn@...onical.com, coreyb@...ux.vnet.ibm.com, pmoore@...hat.com, eparis@...hat.com, djm@...drot.org, segoon@...nwall.com, rostedt@...dmis.org, jmorris@...ei.org, scarybeasts@...il.com, avi@...hat.com, penberg@...helsinki.fi, viro@...iv.linux.org.uk, mingo@...e.hu, akpm@...ux-foundation.org, khilman@...com, borislav.petkov@....com, amwang@...hat.com, oleg@...hat.com, ak@...ux.intel.com, eric.dumazet@...il.com, gregkh@...e.de, dhowells@...hat.com, daniel.lezcano@...e.fr, linux-fsdevel@...r.kernel.org, linux-security-module@...r.kernel.org, olofj@...omium.org, mhalcrow@...gle.com, dlaor@...hat.com, corbet@....net, alan@...rguk.ukuu.org.uk Subject: Re: [PATCH PLACEHOLDER 1/3] fs/exec: "always_unprivileged" patch On Thu, Jan 12, 2012 at 7:11 PM, Andrew Lutomirski <luto@....edu> wrote: > (Also, preventing dropping of privileges will probably make a patch > more complicted -- I'll have to find and update all the places that > allow dropping privileges.) An alternative approach might be that the restricted bit drops all privileges that allows privilege changes in either direction. E.g., - set restricted bit -- adds a check anywhere MNT_NOSUID is -- sets securebit to SECURE_NOROOT|..LOCKED -- drops CAP_SETUID, CAP_DAC_OVERRIDE, ... -- set the caps bounding set to the minimum the restricted bit allows That may deviate from the intent (by re-using caps), but it could keep some of the privilege transition checking code the same. Just a thought, will -- 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/
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