/* SPDX-License-Identifier: GPL-2.0 */ #define _GNU_SOURCE #include <errno.h> #include <sched.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <linux/sched.h> #include <linux/types.h> #include <sys/syscall.h> #include <sys/wait.h> #include "../kselftest.h" #include "clone3_selftests.h" #ifndef CLONE_CLEAR_SIGHAND #define CLONE_CLEAR_SIGHAND 0x100000000ULL #endif static void nop_handler(int signo) { } static int wait_for_pid(pid_t pid) { int status, ret; again: ret = waitpid(pid, &status, 0); if (ret == -1) { if (errno == EINTR) goto again; return -1; } if (!WIFEXITED(status)) return -1; return WEXITSTATUS(status); } static void test_clone3_clear_sighand(void) { int ret; pid_t pid; struct __clone_args args = {}; struct sigaction act; /* * Check that CLONE_CLEAR_SIGHAND and CLONE_SIGHAND are mutually * exclusive. */ args.flags |= CLONE_CLEAR_SIGHAND | CLONE_SIGHAND; args.exit_signal = SIGCHLD; pid = sys_clone3(&args, sizeof(args)); if (pid > 0) ksft_exit_fail_msg( "clone3(CLONE_CLEAR_SIGHAND | CLONE_SIGHAND) succeeded\n"); act.sa_handler = nop_handler; ret = sigemptyset(&act.sa_mask); if (ret < 0) ksft_exit_fail_msg("%s - sigemptyset() failed\n", strerror(errno)); act.sa_flags = 0; /* Register signal handler for SIGUSR1 */ ret = sigaction(SIGUSR1, &act, NULL); if (ret < 0) ksft_exit_fail_msg( "%s - sigaction(SIGUSR1, &act, NULL) failed\n", strerror(errno)); /* Register signal handler for SIGUSR2 */ ret = sigaction(SIGUSR2, &act, NULL); if (ret < 0) ksft_exit_fail_msg( "%s - sigaction(SIGUSR2, &act, NULL) failed\n", strerror(errno)); /* Check that CLONE_CLEAR_SIGHAND works. */ args.flags = CLONE_CLEAR_SIGHAND; pid = sys_clone3(&args, sizeof(args)); if (pid < 0) ksft_exit_fail_msg("%s - clone3(CLONE_CLEAR_SIGHAND) failed\n", strerror(errno)); if (pid == 0) { ret = sigaction(SIGUSR1, NULL, &act); if (ret < 0) exit(EXIT_FAILURE); if (act.sa_handler != SIG_DFL) exit(EXIT_FAILURE); ret = sigaction(SIGUSR2, NULL, &act); if (ret < 0) exit(EXIT_FAILURE); if (act.sa_handler != SIG_DFL) exit(EXIT_FAILURE); exit(EXIT_SUCCESS); } ret = wait_for_pid(pid); if (ret) ksft_exit_fail_msg( "Failed to clear signal handler for child process\n"); ksft_test_result_pass("Cleared signal handlers for child process\n"); } int main(int argc, char **argv) { ksft_print_header(); ksft_set_plan(1); test_clone3_supported(); test_clone3_clear_sighand(); return ksft_exit_pass(); }