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[83.57.175.68]) by smtp.gmail.com with ESMTPSA id q140sm8013865wme.0.2021.02.25.02.42.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Feb 2021 02:42:01 -0800 (PST) Subject: Re: [PATCH] qemu_fw_cfg: Make fw_cfg_rev_attr a proper kobj_attribute To: Nathan Chancellor , Gabriel Somlo , "Michael S. Tsirkin" Cc: Kees Cook , Nick Desaulniers , linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, clang-built-linux@googlegroups.com, Sami Tolvanen References: <20210211194258.4137998-1-nathan@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <6ac57db8-3866-297a-dc37-87c565b51ee2@redhat.com> Date: Thu, 25 Feb 2021 11:41:58 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <20210211194258.4137998-1-nathan@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/11/21 8:42 PM, Nathan Chancellor wrote: > fw_cfg_showrev() is called by an indirect call in kobj_attr_show(), > which violates clang's CFI checking because fw_cfg_showrev()'s second > parameter is 'struct attribute', whereas the ->show() member of 'struct > kobj_structure' expects the second parameter to be of type 'struct > kobj_attribute'. > > $ cat /sys/firmware/qemu_fw_cfg/rev > 3 > > $ dmesg | grep "CFI failure" > [ 26.016832] CFI failure (target: fw_cfg_showrev+0x0/0x8): > > Fix this by converting fw_cfg_rev_attr to 'struct kobj_attribute' where > this would have been caught automatically by the incompatible pointer > types compiler warning. Update fw_cfg_showrev() accordingly. > > Fixes: 75f3e8e47f38 ("firmware: introduce sysfs driver for QEMU's fw_cfg device") > Link: https://github.com/ClangBuiltLinux/linux/issues/1299 > Signed-off-by: Nathan Chancellor > --- > drivers/firmware/qemu_fw_cfg.c | 8 +++----- > 1 file changed, 3 insertions(+), 5 deletions(-) Reviewed-by: Philippe Mathieu-Daudé