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Date: Wed, 8 Nov 2017 11:43:14 -0800 From: Laura Abbott <labbott@...hat.com> To: Kees Cook <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>, Arnd Bergmann <arnd@...db.de>, Josh Triplett <josh@...htriplett.org>, Nicholas Piggin <npiggin@...il.com>, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 0/3] Makefile: Introduce CONFIG_CC_STACKPROTECTOR_AUTO On 11/07/2017 09:38 AM, Kees Cook wrote: > As described in the final patch: > > Nearly all modern compilers support a stack-protector option, and nearly > all modern distributions enable the kernel stack-protector, so enabling > this by default in kernel builds would make sense. However, Kconfig does > not have knowledge of available compiler features, so it isn't safe to > force on, as this would unconditionally break builds for the compilers > or architectures that don't have support. Instead, this introduces a new > option, CONFIG_CC_STACKPROTECTOR_AUTO, which attempts to discover the best > possible stack-protector available, and will allow builds to proceed even > if the compiler doesn't support any stack-protector. > > This option is made the default so that kernels built with modern > compilers will be protected-by-default against stack buffer overflows, > avoiding things like the recent BlueBorne attack. Selection of a specific > stack-protector option remains available, including disabling it. > > > This has lived over the last several days without any unfixed 0day failures. > > v2: > - under ..._AUTO, warn and continue on _all_ stack protector failure cases > - fix 32-bit boot regression due to lazy gz. > - set CONFIG_CC_STACKPROTECTOR_NONE for tiny.config. > > Thanks, > > -Kees > This passed a test build on all Fedora arches, including s390 and ppc. On x86 it picks up the strong option correctly. You're welcome to add Tested-by: Laura Abbott <labbott@...hat.com> Thanks, Laura
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