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From: Linus Walleij <linus.walleij@linaro.org>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
	mhocko@suse.com, Catalin Marinas <catalin.marinas@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	David Howells <dhowells@redhat.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	kvmarm@lists.cs.columbia.edu, Jonathan Corbet <corbet@lwn.net>,
	Abbott Liu <liuwenliang@huawei.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Russell King <linux@armlinux.org.uk>,
	kasan-dev@googlegroups.com,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Andre Przywara <andre.przywara@arm.com>,
	philip@cog.systems, jinb.park7@gmail.com,
	Thomas Gleixner <tglx@linutronix.de>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Nicolas Pitre <nico@fluxnic.net>,
	Greg KH <gregkh@linuxfoundation.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Rob Landley <rob@landley.net>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	thgarnie@google.com, kirill.shutemov@linux.intel.com
Subject: Re: [PATCH v6 2/6] ARM: Disable instrumentation for some code
Date: Tue, 2 Jul 2019 23:56:38 +0200
Message-ID: <CACRpkdb3P6oQTK9FGUkMj4kax8us3rKH6c36pX=HD1_wMqcoJQ@mail.gmail.com> (raw)
In-Reply-To: <20190617221134.9930-3-f.fainelli@gmail.com>

On Tue, Jun 18, 2019 at 12:11 AM Florian Fainelli <f.fainelli@gmail.com> wrote:

> @@ -236,7 +236,8 @@ static int unwind_pop_register(struct unwind_ctrl_block *ctrl,
>                 if (*vsp >= (unsigned long *)ctrl->sp_high)
>                         return -URC_FAILURE;
>
> -       ctrl->vrs[reg] = *(*vsp)++;
> +       ctrl->vrs[reg] = READ_ONCE_NOCHECK(*(*vsp));
> +       (*vsp)++;

I would probably even put in a comment here so it is clear why we
do this. Passers-by may not know that READ_ONCE_NOCHECK() is
even related to KASan.

Other than that,
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
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Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 22:11 [PATCH v6 0/6] KASan for arm Florian Fainelli
2019-06-17 22:11 ` [PATCH v6 1/6] ARM: Add TTBR operator for kasan_init Florian Fainelli
2019-07-02 21:03   ` Linus Walleij
2019-07-11 16:54     ` Florian Fainelli
2019-06-17 22:11 ` [PATCH v6 2/6] ARM: Disable instrumentation for some code Florian Fainelli
2019-07-02 21:56   ` Linus Walleij [this message]
2019-07-11 16:53     ` Florian Fainelli
2019-06-17 22:11 ` [PATCH v6 3/6] ARM: Replace memory function for kasan Florian Fainelli
2019-06-17 22:11 ` [PATCH v6 4/6] ARM: Define the virtual space of KASan's shadow region Florian Fainelli
2019-06-17 22:11 ` [PATCH v6 5/6] ARM: Initialize the mapping of KASan shadow memory Florian Fainelli
2019-06-17 22:11 ` [PATCH v6 6/6] ARM: Enable KASan for arm Florian Fainelli
2019-07-02 21:06 ` [PATCH v6 0/6] " Linus Walleij
2019-07-11 17:00   ` Florian Fainelli
2019-07-18  7:51     ` Arnd Bergmann

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