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Fri, 27 Sep 2024 11:18:13 -0400 (EDT) From: Tycho Andersen To: Alexander Viro , Christian Brauner , Jan Kara , Eric Biederman , Kees Cook Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Tycho Andersen , Tycho Andersen Subject: [PATCH v2 2/2] selftests/exec: add a test to enforce execveat()'s comm Date: Fri, 27 Sep 2024 09:17:46 -0600 Message-Id: <20240927151746.391931-2-tycho@tycho.pizza> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240927151746.391931-1-tycho@tycho.pizza> References: <20240927151746.391931-1-tycho@tycho.pizza> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 6C6C6140017 X-Rspamd-Server: rspam01 X-Stat-Signature: 4ff8jai86i7xies8su34w5dzaei47j3t X-HE-Tag: 1727450296-363974 X-HE-Meta: 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 MT1gqAUt 8xqz7f7ab8xXN0qbPXPyVw6QCkbLmwQPhM3WFSxZxojPT5ydd8earWD4sXr2U6AGaWSjgDcZFEO2DJUul5L77keiSALnP+kdgHqU6q7wAGa6lTLpgQDhVg6jO9/9/SnbDLgu25MGX3E4y9pzAepMxT3TFqRlgc5DHDX8681rSTZs3Tk5KgIqGg/k7FcPfkogkKPFt+4qpDa4P21lCOHZ2L8nKV/eVJTxNrEPc0hkICYGnkEUGX4rs93I7lhrOAsUOTOeJnUbND7DPL/6BINB5E5tatQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Tycho Andersen We want to ensure that /proc/self/comm stays useful for execveat() callers. Signed-off-by: Tycho Andersen --- tools/testing/selftests/exec/execveat.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/testing/selftests/exec/execveat.c b/tools/testing/selftests/exec/execveat.c index 071e03532cba..091029f4ca9b 100644 --- a/tools/testing/selftests/exec/execveat.c +++ b/tools/testing/selftests/exec/execveat.c @@ -419,6 +419,9 @@ int main(int argc, char **argv) if (argc >= 2) { /* If we are invoked with an argument, don't run tests. */ const char *in_test = getenv("IN_TEST"); + /* TASK_COMM_LEN == 16 */ + char buf[32]; + int fd; if (verbose) { ksft_print_msg("invoked with:\n"); @@ -432,6 +435,28 @@ int main(int argc, char **argv) return 1; } + fd = open("/proc/self/comm", O_RDONLY); + if (fd < 0) { + perror("open comm"); + return 1; + } + + if (read(fd, buf, sizeof(buf)) < 0) { + close(fd); + perror("read comm"); + return 1; + } + close(fd); + + /* + * /proc/self/comm should fail to convert to an integer, i.e. + * atoi() should return 0. + */ + if (atoi(buf) != 0) { + ksft_print_msg("bad /proc/self/comm: %s", buf); + return 1; + } + /* Use the final argument as an exit code. */ rc = atoi(argv[argc - 1]); exit(rc);