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Message-ID: <20161110204046.GW3117@twins.programming.kicks-ass.net>
Date: Thu, 10 Nov 2016 21:40:46 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Elena Reshetova <elena.reshetova@...el.com>
Cc: kernel-hardening@...ts.openwall.com, keescook@...omium.org,
arnd@...db.de, tglx@...utronix.de, mingo@...hat.com,
h.peter.anvin@...el.com, will.deacon@....com,
Hans Liljestrand <ishkamiel@...il.com>,
David Windsor <dwindsor@...il.com>
Subject: Re: [RFC v4 PATCH 12/13] x86: implementation for HARDENED_ATOMIC
On Thu, Nov 10, 2016 at 10:24:47PM +0200, Elena Reshetova wrote:
> static __always_inline void atomic_add(int i, atomic_t *v)
> {
> + asm volatile(LOCK_PREFIX "addl %1,%0\n"
> +
> +#ifdef CONFIG_HARDENED_ATOMIC
> + "jno 0f\n"
> + LOCK_PREFIX "subl %1,%0\n"
> + "int $4\n0:\n"
> + _ASM_EXTABLE(0b, 0b)
This is unreadable gunk.
> +#endif
> +
> : "+m" (v->counter)
> : "ir" (i));
> }
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