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Message-ID: <20200504173356.GA7200@google.com>
Date: Mon, 4 May 2020 10:33:56 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Will Deacon <will@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
Catalin Marinas <catalin.marinas@....com>,
James Morse <james.morse@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Mark Rutland <mark.rutland@....com>,
Masahiro Yamada <masahiroy@...nel.org>,
Michal Marek <michal.lkml@...kovi.net>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dave Martin <Dave.Martin@....com>,
Laura Abbott <labbott@...hat.com>, Marc Zyngier <maz@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Jann Horn <jannh@...gle.com>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
clang-built-linux@...glegroups.com,
kernel-hardening@...ts.openwall.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 01/12] add support for Clang's Shadow Call Stack (SCS)
On Mon, May 04, 2020 at 05:52:28PM +0100, Will Deacon wrote:
> On Mon, Apr 27, 2020 at 01:45:46PM -0700, Sami Tolvanen wrote:
> > I agree that allocating from a kmem_cache isn't ideal for safety. It's a
> > compromise to reduce memory overhead.
>
> Do you think it would be a problem if we always allocated a page for the
> SCS?
Yes, the memory overhead was deemed too large for Android devices, which
have thousands of threads running.
Sami
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