linux-kernel - Re: [PATCH] mm: larger stack guard gap, between vmas

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Message-ID: <CA+55aFzNvwEmkS-i1MWRym=bqH8qTE=S=oDdaM-Y0ci3M_5rSA@mail.gmail.com>
Date:   Wed, 5 Jul 2017 16:55:16 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>,
        Hugh Dickins <hughd@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Rik van Riel <riel@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Tony Luck <tony.luck@...el.com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Diller <deller@....de>,
        James Hogan <james.hogan@...tec.com>,
        Laura Abbott <labbott@...hat.com>, Greg KH <greg@...ah.com>,
        "security@...nel.org" <security@...nel.org>,
        Qualys Security Advisory <qsa@...lys.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ximin Luo <infinity0@...ian.org>
Subject: Re: [PATCH] mm: larger stack guard gap, between vmas

On Wed, Jul 5, 2017 at 4:50 PM, Kees Cook <keescook@...omium.org> wrote:
>
> As part of that should we put restrictions on the environment of
> set*id exec too?

I'm not seeing what sane limits you could use.

I think the concept of "reset as much of the environment to sane
things when running suid binaries" is a good concepr.

But we simply don't have any sane values to reset things to.

                Linus