9132c3947b
Test for the NULL argv argument producing a single empty string on exec. Cc: Eric Biederman <ebiederm@xmission.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Yang Yingliang <yangyingliang@huawei.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-kselftest@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/lkml/20220201011637.2457646-1-keescook@chromium.org
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Test that empty argvs are swapped out for a single empty string. */
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include "../kselftest.h"
|
|
|
|
#define FORK(exec) \
|
|
do { \
|
|
pid = fork(); \
|
|
if (pid == 0) { \
|
|
/* Child */ \
|
|
exec; /* Some kind of exec */ \
|
|
perror("# " #exec); \
|
|
return 1; \
|
|
} \
|
|
check_result(pid, #exec); \
|
|
} while (0)
|
|
|
|
void check_result(pid_t pid, const char *msg)
|
|
{
|
|
int wstatus;
|
|
|
|
if (pid == (pid_t)-1) {
|
|
perror("# fork");
|
|
ksft_test_result_fail("fork failed: %s\n", msg);
|
|
return;
|
|
}
|
|
if (waitpid(pid, &wstatus, 0) < 0) {
|
|
perror("# waitpid");
|
|
ksft_test_result_fail("waitpid failed: %s\n", msg);
|
|
return;
|
|
}
|
|
if (!WIFEXITED(wstatus)) {
|
|
ksft_test_result_fail("child did not exit: %s\n", msg);
|
|
return;
|
|
}
|
|
if (WEXITSTATUS(wstatus) != 0) {
|
|
ksft_test_result_fail("non-zero exit: %s\n", msg);
|
|
return;
|
|
}
|
|
ksft_test_result_pass("%s\n", msg);
|
|
}
|
|
|
|
int main(int argc, char *argv[], char *envp[])
|
|
{
|
|
pid_t pid;
|
|
static char * const args[] = { NULL };
|
|
static char * const str[] = { "", NULL };
|
|
|
|
/* argc counting checks */
|
|
if (argc < 1) {
|
|
fprintf(stderr, "# FAIL: saw argc == 0 (old kernel?)\n");
|
|
return 1;
|
|
}
|
|
if (argc != 1) {
|
|
fprintf(stderr, "# FAIL: unknown argc (%d)\n", argc);
|
|
return 1;
|
|
}
|
|
if (argv[0][0] == '\0') {
|
|
/* Good, we found a NULL terminated string at argv[0]! */
|
|
return 0;
|
|
}
|
|
|
|
/* Test runner. */
|
|
ksft_print_header();
|
|
ksft_set_plan(5);
|
|
|
|
FORK(execve(argv[0], str, NULL));
|
|
FORK(execve(argv[0], NULL, NULL));
|
|
FORK(execve(argv[0], NULL, envp));
|
|
FORK(execve(argv[0], args, NULL));
|
|
FORK(execve(argv[0], args, envp));
|
|
|
|
ksft_exit(ksft_cnt.ksft_pass == ksft_plan);
|
|
}
|