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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id b4sm10932548pji.52.2021.07.11.07.55.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jul 2021 07:55:20 -0700 (PDT) From: Kees Cook To: Bjorn Andersson Cc: Kees Cook , Mathieu Poirier , Andy Gross , Ohad Ben-Cohen , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] rpmsg: glink: Replace strncpy() with strscpy_pad() Date: Sun, 11 Jul 2021 07:55:17 -0700 Message-Id: <20210711145517.1434486-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1814; h=from:subject; bh=CGejJDIBWoCTMrdLfdYOlKTt2khst8/bmsGsqzGrjiA=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBg6wZVj+vEe7YcbCfgSji3keoTaHrI/ZHofnZ1HVRt kwNnps2JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYOsGVQAKCRCJcvTf3G3AJjp7D/ 4xOOjTrRSPqTRBymI1eoBS8GYyPpRa2EVxvB8ZW9jVsORyPMd+qrSptl1PBlgEtLrz91zlFDHigp3M Cl4XecxDPkow1jRbAEfCks39EzVxzHMY9gV7fpYG5qIPKFeKciIn4Ou6vwXPFl6E9iPBqm4F8t6yo+ IkCfBrhLyVYo4u4B1Ri8wj6ztXeIIzQNVxEmzxWzh5UcNp4l7IAkoru3ZgFHoE3yfbABsX4Qitw+cz LELsLx3KrcqETDczzGGSdZKT83iChx4H4B/y1xGvK7azhx/1PnCisiui7W8V0D/LswCl8qeTrj3XFB TZfCKs/qRQe60vO6/Se8gJkLnzovkODC9RxeVAkqGpq78fD6QoDryD8F8QoS2xn3AoJz2SiMBV0pPs CoQfmYM4IKYxecE1UxDmzwdup5vtSvb0xVobHYXQt+i9sbpferpFh2pjYPn6I43Gpju1PfUSyXQ2ZD 1NcASe91/pxA/1TD0+ccRSdz3olzulteWAdzMPKVEyU9X5/PEjJ2VZ+diHDzcN0EEPc64XCwBDyrfe ZKGvs1VDZT9hwo4Gy3N8hdikkUEOyjpvJWA+97P1iu0BOdnlCFIS5TwnOnY1zKvkfAMt5rRnKsWVdP MXSFMMpvhblVW8gDISa8TsXX5a7UVzuihmcw5yXT/PxOqiJn51exkx9Tl2SQ== 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 Signed-off-by: Kees Cook --- 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;