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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id j4sm5379890pgi.6.2021.08.17.23.05.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:05:51 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Andy Gross , Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier , linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, "Gustavo A . R . Silva" , Greg Kroah-Hartman , Andrew Morton , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 03/63] rpmsg: glink: Replace strncpy() with strscpy_pad() Date: Tue, 17 Aug 2021 23:04:33 -0700 Message-Id: <20210818060533.3569517-4-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2189; h=from:subject; bh=zEHqpi3jCPJJtimsK7NnbA6EWwLoFKP9r9dL5ArZyiQ=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMe8xrKEUyyynWY+9ZZnkpsPM1eYEwBqySCGW3z U2JTvZSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjHgAKCRCJcvTf3G3AJsNcD/ 9XTm0UNtLhF3pcJlIGQ3OBX+21oX4i3rCVVUF6tE46BnLDEeTE53Dgx2PT3pmkaqnzHQEBiWdAf3D+ 2ibPEIWXlwbj/FEpJcA5DcOhIfEfnzVBjHhlpnJrh3SUlVbIH9XtzFjtsdZ62/6vRCWqqArv25gvTH 5vxwJnbsrBQoJVmDrGhqBbXkHwDMfTU3uqjDwaqLe+Jkddl6WDrvL7HDi/a/O+TPG8Ryye+tkF8oUf ynPS+GUMYS16FY7ASzH/0ByS7HnPSf7jbXyCDl9CItMWBCukRuP92dgD5E5h+780QjYVR1TOYTsK7L 29q0KYIRAz/CU7s7NU3I6O+skA8+wO2q8V/qNN9IwIYlovEae8xYxtZGFKS7Asnkx5L41BTHNAewGa ywsnWka4jG//fkzAcJxqaWp/LNz7YIf4ftOs7TahiCUUPyNjn9hGBXe/6UCbulNetUvkUh3MpYNLgO 29/PcVY/jHQm6XmFOLai05ukoMYzOImxjihjBRnvhun0ISzdDvZiF7LuyX34tnTNoUqw0tPYmoyzzS qwS895l/S/Iu0aJ6C60OCVKPU+rRZE7aqmw0H4xtsS4EhelVEbtCx+EFSZg6NR+iqtNBvI80hwpi2k l928h0W2SY4eY/GnEj658aM4Rs5DKGjtsLy4poujBDA8Ehq211Zk9Xhct33g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The use of strncpy() is considered deprecated for NUL-terminated strings[1]. Replace strncpy() with strscpy_pad() (as it seems this case expects the NUL padding to fill the allocation following the flexible array). This additionally silences a warning seen when building under -Warray-bounds: ./include/linux/fortify-string.h:38:30: warning: '__builtin_strncpy' offset 24 from the object at '__mptr' is out of the bounds of referenced subobject 'data' with type 'u8[]' {aka 'unsigned char[]'} at offset 24 [-Warray-bounds] 38 | #define __underlying_strncpy __builtin_strncpy | ^ ./include/linux/fortify-string.h:50:9: note: in expansion of macro '__underlying_strncpy' 50 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ drivers/rpmsg/qcom_glink_native.c: In function 'qcom_glink_work': drivers/rpmsg/qcom_glink_native.c:36:5: note: subobject 'data' declared here 36 | u8 data[]; | ^~~~ [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings Cc: Andy Gross Cc: Bjorn Andersson Cc: Ohad Ben-Cohen Cc: Mathieu Poirier Cc: linux-arm-msm@vger.kernel.org Cc: linux-remoteproc@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Link: https://lore.kernel.org/lkml/20210728020745.GB35706@embeddedor --- drivers/rpmsg/qcom_glink_native.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 05533c71b10e..c7b9de655080 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1440,7 +1440,7 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid, } rpdev->ept = &channel->ept; - strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE); + strscpy_pad(rpdev->id.name, name, RPMSG_NAME_SIZE); rpdev->src = RPMSG_ADDR_ANY; rpdev->dst = RPMSG_ADDR_ANY; rpdev->ops = &glink_device_ops;