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Date: Fri, 25 Oct 2019 13:51:22 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Nick Desaulniers <ndesaulniers@...gle.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>,
Mark Rutland <mark.rutland@....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 <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/17] add support for Clang's Shadow Call Stack (SCS)
On Fri, Oct 25, 2019 at 9:22 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
> > +static void scs_free(void *s)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < SCS_CACHE_SIZE; i++) {
> > + if (this_cpu_cmpxchg(scs_cache[i], 0, s) != 0)
> > + continue;
> > +
> > + return;
> > + }
>
> prefer:
>
> for ...:
> if foo() == 0:
> return
>
> to:
>
> for ...:
> if foo() != 0:
> continue
> return
This was essentially copied from free_thread_stack in kernel/fork.c,
but I agree, your way is cleaner. I'll change this in the next
version. Thanks!
Sami
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