Message ID | 20240220200445.4000158-1-adhemerval.zanella@linaro.org |
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([2804:1b3:a7c0:8177:59a3:f5e3:1b0a:262]) by smtp.gmail.com with ESMTPSA id qn3-20020a17090b3d4300b00298f88c3e48sm42324pjb.11.2024.02.20.12.04.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Feb 2024 12:04:49 -0800 (PST) From: Adhemerval Zanella <adhemerval.zanella@linaro.org> To: libc-alpha@sourceware.org Cc: Noah Goldstein <goldstein.w.n@gmail.com>, Alexander Monakov <amonakov@ispras.ru> Subject: [PATCH v2 0/3] Improve wcsstr Date: Tue, 20 Feb 2024 17:04:42 -0300 Message-Id: <20240220200445.4000158-1-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list <libc-alpha.sourceware.org> List-Unsubscribe: <https://sourceware.org/mailman/options/libc-alpha>, <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe> List-Archive: <https://sourceware.org/pipermail/libc-alpha/> List-Post: <mailto:libc-alpha@sourceware.org> List-Help: <mailto:libc-alpha-request@sourceware.org?subject=help> List-Subscribe: <https://sourceware.org/mailman/listinfo/libc-alpha>, <mailto:libc-alpha-request@sourceware.org?subject=subscribe> Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org |
Series | Improve wcsstr | |
Message
Adhemerval Zanella Netto
Feb. 20, 2024, 8:04 p.m. UTC
Different than strstr, wcsstr still uses an O(m*n) algorithm that might be considered a security issue (although BZ 23865 was marked security- since there is no actual application impact). The gnulib recently added a wrapper to fix it [1] and it is used as the base de str-two-way.h implementation. This patch adds a similar implementation, and different than strstr, neither the "shift table" optimization nor the self-adapting filtering check is used because it would result in a too-large shift table (and it also simplifies the implementation bit). The patchset also added a proper tests for wcsstr, based on strstr one. [1] https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=9411c5e467cf60f6295b9fed306029f341a0f24f Changes from v1: * Add more tests from gnulib. * Removed unused macros from wcsstr. Adhemerval Zanella (3): string: Remove c_strstr from test-strstr wcsmbs: Add test-wcsstr wcsmbs: Ensure wcstr worst-case linear execution time (BZ 23865) string/test-strstr.c | 305 ++++++++++++++++++++++++++++++++++-------- wcsmbs/Makefile | 1 + wcsmbs/test-wcsstr.c | 20 +++ wcsmbs/wcs-two-way.h | 312 +++++++++++++++++++++++++++++++++++++++++++ wcsmbs/wcsstr.c | 95 ++++--------- 5 files changed, 609 insertions(+), 124 deletions(-) create mode 100644 wcsmbs/test-wcsstr.c create mode 100644 wcsmbs/wcs-two-way.h