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Date: Fri, 15 Jul 2016 12:23:11 -0700
From: Kees Cook <keescook@...omium.org>
To: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Cc: Balbir Singh <bsingharora@...il.com>, LKML <linux-kernel@...r.kernel.org>,
Rik van Riel <riel@...hat.com>, Casey Schaufler <casey@...aufler-ca.com>,
PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>,
Russell King <linux@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>, Michael Ellerman <mpe@...erman.id.au>,
Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
"David S. Miller" <davem@...emloft.net>, "x86@...nel.org" <x86@...nel.org>, Christoph Lameter <cl@...ux.com>,
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Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>, Mathias Krause <minipli@...glemail.com>,
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Andrea Arcangeli <aarcange@...hat.com>, Dmitry Vyukov <dvyukov@...gle.com>,
Laura Abbott <labbott@...oraproject.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, linux-ia64@...r.kernel.org,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, sparclinux <sparclinux@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>
Subject: Re: Re: [PATCH v2 02/11] mm: Hardened usercopy
On Fri, Jul 15, 2016 at 12:19 PM, Daniel Micay <danielmicay@...il.com> wrote:
>> I'd like it to dump stack and be fatal to the process involved, but
>> yeah, I guess BUG() would work. Creating an infrastructure for
>> handling security-related Oopses can be done separately from this
>> (and
>> I'd like to see that added, since it's a nice bit of configurable
>> reactivity to possible attacks).
>
> In grsecurity, the oops handling also uses do_group_exit instead of
> do_exit but both that change (or at least the option to do it) and the
> exploit handling could be done separately from this without actually
> needing special treatment for USERCOPY. Could expose is as something
> like panic_on_oops=2 as a balance between the existing options.
I'm also uncomfortable about BUG() being removed by unsetting
CONFIG_BUG, but that seems unlikely. :)
-Kees
--
Kees Cook
Chrome OS & Brillo Security
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