From: Linus Walleij <linus.walleij@linaro.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
Keith Packard <keithpac@amazon.com>,
Russell King <linux@armlinux.org.uk>,
Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
Neil Armstrong <narmstrong@baylibre.com>
Subject: Re: [PATCH v4 1/5] gcc-plugins: arm-ssp: Prepare for THREAD_INFO_IN_TASK support
Date: Wed, 15 Sep 2021 00:04:34 +0200 [thread overview]
Message-ID: <CACRpkdbVTxhHotX1Ha5cPvGEc76yENk4KhQxncSWa9YL7_AgOw@mail.gmail.com> (raw)
In-Reply-To: <20210913104001.3043132-2-ardb@kernel.org>
Hi Ard,
thanks for this patch series!
On Mon, Sep 13, 2021 at 12:40 PM Ard Biesheuvel <ardb@kernel.org> wrote:
> config STACKPROTECTOR_PER_TASK
> bool "Use a unique stack canary value for each task"
> - depends on GCC_PLUGINS && STACKPROTECTOR && SMP && !XIP_DEFLATED_DATA
> + depends on GCC_PLUGINS && STACKPROTECTOR && THREAD_INFO_IN_TASK && !XIP_DEFLATED_DATA
> select GCC_PLUGIN_ARM_SSP_PER_TASK
Am I reading this right that STACKPROTECTOR_PER_TASK
was available for ARMv6 with SMP before this
change and after this change it will only be available for
ARMv7 since THREAD_INFO_IN_TASK which is now a dependency
will only be available for ARMv7 (or ARMv6k)?
I suppose this is a reasonable compromise, as I don't use it or need
it on my ARM PB11MPCore and neither do I think the Oxnas router,
but we should write this explicitly in the commit message.
Yours,
Linus Walleij
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next prev parent reply other threads:[~2021-09-14 22:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 10:39 [PATCH v4 0/5] ARM: support THREAD_INFO_IN_TASK Ard Biesheuvel
2021-09-13 10:39 ` [PATCH v4 1/5] gcc-plugins: arm-ssp: Prepare for THREAD_INFO_IN_TASK support Ard Biesheuvel
2021-09-13 15:40 ` Kees Cook
2021-09-14 22:04 ` Linus Walleij [this message]
2021-09-15 6:37 ` Ard Biesheuvel
2021-09-15 16:26 ` Kees Cook
2021-09-13 10:39 ` [PATCH v4 2/5] ARM: smp: Pass task to secondary_start_kernel Ard Biesheuvel
2021-09-13 23:25 ` Linus Walleij
2021-09-13 10:39 ` [PATCH v4 3/5] ARM: smp: Free up the TLS register while running in the kernel Ard Biesheuvel
2021-09-13 10:40 ` [PATCH v4 4/5] ARM: smp: Store current pointer in TPIDRURO register if available Ard Biesheuvel
2021-09-13 11:22 ` Russell King (Oracle)
2021-09-13 12:52 ` Ard Biesheuvel
2021-09-13 13:52 ` Russell King (Oracle)
2021-09-13 10:40 ` [PATCH v4 5/5] ARM: smp: Enable THREAD_INFO_IN_TASK Ard Biesheuvel
2021-09-13 11:23 ` [PATCH v4 0/5] ARM: support THREAD_INFO_IN_TASK Russell King (Oracle)
2021-09-13 15:40 ` Kees Cook
2021-09-14 9:44 ` Arnd Bergmann
2021-09-14 9:50 ` Ard Biesheuvel
2021-09-14 13:07 ` Arnd Bergmann
2021-09-14 17:10 ` Ard Biesheuvel
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