Date: Fri, 15 Nov 2019 10:34:25 -0800 From: Sami Tolvanen <samitolvanen@...gle.com> To: Mark Rutland <mark.rutland@....com> Cc: Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Dave Martin <Dave.Martin@....com>, Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>, Marc Zyngier <maz@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Jann Horn <jannh@...gle.com>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, clang-built-linux <clang-built-linux@...glegroups.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v5 05/14] add support for Clang's Shadow Call Stack (SCS) On Fri, Nov 15, 2019 at 7:37 AM Mark Rutland <mark.rutland@....com> wrote: > > +config SHADOW_CALL_STACK_VMAP > > + bool > > + depends on SHADOW_CALL_STACK > > + help > > + Use virtually mapped shadow call stacks. Selecting this option > > + provides better stack exhaustion protection, but increases per-thread > > + memory consumption as a full page is allocated for each shadow stack. > > The bool needs some display text to make it selectable. > > This should probably be below SHADOW_CALL_STACK so that when it shows up > in menuconfig it's where you'd expect it to be. > > I locally hacked that in, but when building defconfig + > SHADOW_CALL_STACK + SHADOW_CALL_STACK_VMAP, the build explodes as below: Ugh, thanks for pointing this out. I'll fix this in v6. Sami
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