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b=H4sIAOF9A2UC/x2Nyw6CMBAAf4Xs2U1oSwL4K8ZDLQtuTB/Z2ioh/ LuNt5nLzAGZhCnDtTtAqHLmGJqoSwfuacNGyEtz0L02/awGzG8JLu24CFeSjFsqjT2GWCrZgqG +PLoohCuL/9gGDsdZaW0mMz1GDS2dhFb+/re3+3n+AGeHtrSGAAAA X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1694727649; l=1779; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=veRS+F8fLCXOEB+IwiJ2Jr1EVTbkT3rdWvzzy6w4YBI=; b=mxTJZ6DGijn6/IfaObu6+S9iqoBOFL/VXV+IETu4YWEw2MiDJWtx0Af8fFwoaDQuBhONmsZIu cVfnCIxjq5WDEKO2xTXXXVEW93KmK0oIwx+SXuNXj091829J4/96aii X-Mailer: b4 0.12.3 Message-ID: <20230914-strncpy-drivers-gpu-drm-nouveau-nvkm-core-firmware-c-v1-1-3aeae46c032f@google.com> Subject: [PATCH] drm/nouveau/core: refactor deprecated strncpy From: Justin Stitt To: Ben Skeggs , Karol Herbst , Lyude Paul , David Airlie , Daniel Vetter Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (fry.vger.email [0.0.0.0]); Thu, 14 Sep 2023 14:41:16 -0700 (PDT) X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on fry.vger.email X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777076962541491195 X-GMAIL-MSGID: 1777076962541491195 `strncpy` is deprecated for use on NUL-terminated destination strings [1]. We should prefer more robust and less ambiguous string interfaces. A suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. There is likely no bug in the current implementation due to the safeguard: | cname[sizeof(cname) - 1] = '\0'; ... however we can provide simpler and easier to understand code using the newer (and recommended) `strscpy` api. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook Reviewed-by: Lyude Paul --- drivers/gpu/drm/nouveau/nvkm/core/firmware.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec change-id: 20230914-strncpy-drivers-gpu-drm-nouveau-nvkm-core-firmware-c-791223838b72 Best regards, -- Justin Stitt diff --git a/drivers/gpu/drm/nouveau/nvkm/core/firmware.c b/drivers/gpu/drm/nouveau/nvkm/core/firmware.c index 91fb494d4009..374212da9e95 100644 --- a/drivers/gpu/drm/nouveau/nvkm/core/firmware.c +++ b/drivers/gpu/drm/nouveau/nvkm/core/firmware.c @@ -79,8 +79,7 @@ nvkm_firmware_get(const struct nvkm_subdev *subdev, const char *fwname, int ver, int i; /* Convert device name to lowercase */ - strncpy(cname, device->chip->name, sizeof(cname)); - cname[sizeof(cname) - 1] = '\0'; + strscpy(cname, device->chip->name, sizeof(cname)); i = strlen(cname); while (i) { --i;