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Tue, 23 Jun 2020 03:16:42 -0700 (PDT) Received: from [10.9.0.18] ([185.248.161.177]) by smtp.gmail.com with ESMTPSA id h4sm159388qtd.43.2020.06.23.03.16.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Jun 2020 03:16:41 -0700 (PDT) Reply-To: alex.popov@linux.com Subject: Re: [PATCH 5/5] gcc-plugins/stackleak: Don't instrument vgettimeofday.c in arm64 VDSO To: Will Deacon , Kees Cook Cc: Emese Revfy , Miguel Ojeda , Masahiro Yamada , Michal Marek , Andrew Morton , Masahiro Yamada , Thiago Jung Bauermann , Luis Chamberlain , Jessica Yu , Sven Schnelle , Iurii Zaikin , Catalin Marinas , Vincenzo Frascino , Thomas Gleixner , Peter Collingbourne , Naohiro Aota , Alexander Monakov , Mathias Krause , PaX Team , Brad Spengler , Laura Abbott , Florian Weimer , kernel-hardening@lists.openwall.com, linux-kbuild@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, gcc@gcc.gnu.org, notify@kernel.org References: <20200604134957.505389-1-alex.popov@linux.com> <20200604134957.505389-6-alex.popov@linux.com> <20200604135806.GA3170@willie-the-truck> <202006091149.6C78419@keescook> <20200610073046.GA15939@willie-the-truck> From: Alexander Popov Autocrypt: addr=alex.popov@linux.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200610073046.GA15939@willie-the-truck> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10.06.2020 10:30, Will Deacon wrote: > On Tue, Jun 09, 2020 at 12:09:27PM -0700, Kees Cook wrote: >> arm_ssp_per_task_plugin.c >> 32-bit ARM only (but likely needs disabling for 32-bit ARM vDSO?) I tested: on 32-bit arm vDSO is built with plugin flags. I will filter them out in a separate patch in v2 of the series. > On arm64, the 32-bit toolchain is picked up via CC_COMPAT -- does that still > get the plugins? I tested it with this command: make ARCH=arm64 CROSS_COMPILE_COMPAT=arm-linux-gnueabi- CROSS_COMPILE=aarch64-linux-gnu- V=1 I see that COMPAT_VDSO is built without plugin flags. So it's ok. Best regards, Alexander