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[93.34.90.105]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-37cd57427c6sm8889363f8f.96.2024.09.30.04.31.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Sep 2024 04:31:30 -0700 (PDT) From: Christian Marangi To: Jens Axboe , Jonathan Corbet , Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kees Cook , Andy Shevchenko , Christian Marangi , Daniel Golle , INAGAKI Hiroshi , Christian Brauner , Al Viro , Li Lingfeng , Ming Lei , Christian Heusel , linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-hardening@vger.kernel.org, Miquel Raynal , Lorenzo Bianconi , upstream@airoha.com Cc: Rasmus Villemoes Subject: [PATCH v4 3/5] string: add strends() helper to check if a string ends with a suffix Date: Mon, 30 Sep 2024 13:30:10 +0200 Message-ID: <20240930113045.28616-4-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240930113045.28616-1-ansuelsmth@gmail.com> References: <20240930113045.28616-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add strends() helper to check if a string ends with a suffix. The unreadable strends is chosen to keep consistency with the parallel strstarts helper used to check if a string starts with a prefix. To prevent out-of-bounds read, len of string is checked against the prefix length before comparing the 2 string at the offset. Suggested-by: Rasmus Villemoes Signed-off-by: Christian Marangi --- include/linux/string.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index 0dd27afcfaf7..2c3df6ffb326 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -353,6 +353,19 @@ static inline bool strstarts(const char *str, const ch= ar *prefix) return strncmp(str, prefix, strlen(prefix)) =3D=3D 0; } =20 +/** + * strends - does @str end with @suffix? + * @str: string to examine + * @suffix: suffix to look for. + */ +static inline bool strends(const char *str, const char *suffix) +{ + size_t n =3D strlen(str); + size_t m =3D strlen(suffix); + + return n >=3D m && !memcmp(str + n - m, suffix, m); +} + size_t memweight(const void *ptr, size_t bytes); =20 /** --=20 2.45.2