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Date: Wed, 21 Jun 2017 12:46:28 +0200
From: Agostino Sarubbo <>
Subject: Re: Qualys Security Advisory - The Stack Clash

On Monday 19 June 2017 08:28:43 Qualys Security Advisory wrote:
> III. Solutions
> - Recompile all userland code (, libraries, binaries) with GCC's
>   "-fstack-check" option, which prevents the stack-pointer from moving
>   into another memory region without accessing the stack guard-page (it
>   writes one word to every 4KB page allocated on the stack).

For the record, Gentoo Hardened enables by default -fstack-check=specific

Agostino Sarubbo
Gentoo Linux Developer

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