linux-kernel - Re: [kernel-hardening] [PATCH v2 0/5] stackprotector: ascii armor the stack canary

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Message-ID: <1505906284.3490.5.camel@opteya.com>
Date:   Wed, 20 Sep 2017 13:18:04 +0200
From:   Yann Droneaud <ydroneaud@...eya.com>
To:     Solar Designer <solar@...nwall.com>, riel@...hat.com
Cc:     linux-kernel@...r.kernel.org, danielmicay@...il.com, tytso@....edu,
        keescook@...omium.org, hpa@...or.com, luto@...capital.net,
        mingo@...nel.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        linux-sh@...r.kernel.org, ysato@...rs.sourceforge.jp,
        kernel-hardening@...ts.openwall.com
Subject: Re: [kernel-hardening] [PATCH v2 0/5] stackprotector: ascii armor
 the stack canary

Hi,

Le mardi 19 septembre 2017 à 19:16 +0200, Solar Designer a écrit :
>
> We could put/require a NUL in the middle of the canary,
> but with the full canary being only 64-bit at most that would also
> make some attacks easier.
> 

Are you suggesting to randomly select which byte to set to 0 in each
canary ?

Regards.

-- 
Yann Droneaud
OPTEYA