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([2804:1b3:a7c3:7f2e:11d:92b4:4d78:4197]) by smtp.gmail.com with ESMTPSA id l28-20020a635b5c000000b0056b6d1ac949sm1309788pgm.13.2023.10.17.06.06.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Oct 2023 06:06:24 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v2 05/19] elf: Do not process invalid tunable format Date: Tue, 17 Oct 2023 10:05:12 -0300 Message-Id: <20231017130526.2216827-6-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231017130526.2216827-1-adhemerval.zanella@linaro.org> References: <20231017130526.2216827-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patch=linaro.org@sourceware.org Tunable definitions with more than one '=' on are parsed and enabled, and any subsequent '=' are ignored. It means that tunables in the form 'tunable=tunable=value' or 'tunable=value=value' are handled as 'tunable=value'. These inputs are likely user input errors, which should not be accepted. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-tunables.c | 6 ++++-- elf/tst-tunables.c | 22 +++++++++++++++++----- 2 files changed, 21 insertions(+), 7 deletions(-) diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index a83bd2b8bc..59bee61124 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -192,10 +192,12 @@ parse_tunables (char *valstring) const char *value = p; - while (*p != ':' && *p != '\0') + while (*p != '=' && *p != ':' && *p != '\0') p++; - if (*p == '\0') + if (*p == '=') + break; + else if (*p == '\0') done = true; else *p++ = '\0'; diff --git a/elf/tst-tunables.c b/elf/tst-tunables.c index 57cf532fc4..03039b5260 100644 --- a/elf/tst-tunables.c +++ b/elf/tst-tunables.c @@ -161,24 +161,36 @@ static const struct test_t 0, 0, }, - /* The ill-formatted tunable is also skipped. */ + /* If there is a ill-formatted key=value, everything after is also ignored. */ { "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2", - 2, + 0, 0, 0, }, - /* For an integer tunable, parse will stop on non number character. */ { "glibc.malloc.check=2=2", - 2, + 0, 0, 0, }, { "glibc.malloc.check=2=2:glibc.malloc.mmap_threshold=4096", + 0, + 0, + 0, + }, + { + "glibc.malloc.check=2=2:glibc.malloc.check=2", + 0, + 0, + 0, + }, + /* Valid tunables set before ill-formatted ones are set. */ + { + "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096", 2, - 4096, + 0, 0, } };