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Thu, 08 Oct 2026 09:41:26 -0700 (PDT) From: Leizhen Zhang To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] tracepoint-update: check the section end before reading a string Date: Thu, 8 Oct 2026 11:41:17 -0500 Message-Id: <20261008164117.3670267-2-lzsx618@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261008164117.3670267-1-lzsx618@gmail.com> References: <20261008164117.3670267-1-lzsx618@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: 8bit for_each_shdr_str() evaluates strlen(str) before checking str < end, so after the last string of the section it calls strlen() on the bytes just past the section. Check the bound first. Fixes: e30f8e61e251 ("tracing: Add a tracepoint verification check at build time") Assisted-by: Claude:claude-opus-5-5 ASan Signed-off-by: Leizhen Zhang --- v2: - Use my real name in the From and Signed-off-by lines. No code changes. v1: https://lore.kernel.org/r/20261005104200.1787946-2-lzsx618@gmail.com scripts/tracepoint-update.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/tracepoint-update.c b/scripts/tracepoint-update.c index 4c4b669011..ad5f691c15 100644 --- a/scripts/tracepoint-update.c +++ b/scripts/tracepoint-update.c @@ -74,7 +74,7 @@ static int add_string(const char *str, const char ***vals, int *count) #define for_each_shdr_str(len, ehdr, sec) \ for (const char *str = (void *)(ehdr) + shdr_offset(sec), \ *end = str + shdr_size(sec); \ - len = strlen(str), str < end; \ + str < end && (len = strlen(str), true); \ str += (len) + 1) -- 2.34.1