// SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE#include <errno.h>#include <fcntl.h>#include <limits.h>#include <linux/types.h>#include <poll.h>#include <pthread.h>#include <sched.h>#include <signal.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <syscall.h>#include <sys/prctl.h>#include <sys/wait.h>#include <unistd.h>#include <sys/socket.h>#include <linux/kcmp.h>#include <sys/stat.h>#include <sys/xattr.h> #include "pidfd.h"#include "kselftest_harness.h" FIXTURE(pidfs_setattr){	pid_t child_pid;	int child_pidfd;}; FIXTURE_SETUP(pidfs_setattr){	self->child_pid = create_child(&self->child_pidfd, CLONE_NEWUSER | CLONE_NEWPID);	EXPECT_GE(self->child_pid, 0); 	if (self->child_pid == 0)		_exit(EXIT_SUCCESS);} FIXTURE_TEARDOWN(pidfs_setattr){	sys_waitid(P_PID, self->child_pid, NULL, WEXITED);	EXPECT_EQ(close(self->child_pidfd), 0);} TEST_F(pidfs_setattr, no_chown){	ASSERT_LT(fchown(self->child_pidfd, 1234, 5678), 0);	ASSERT_EQ(errno, EOPNOTSUPP);} TEST_F(pidfs_setattr, no_chmod){	ASSERT_LT(fchmod(self->child_pidfd, 0777), 0);	ASSERT_EQ(errno, EOPNOTSUPP);} TEST_F(pidfs_setattr, no_exec){	char *const argv[] = { NULL };	char *const envp[] = { NULL }; 	ASSERT_LT(execveat(self->child_pidfd, "", argv, envp, AT_EMPTY_PATH), 0);	ASSERT_EQ(errno, EACCES);} TEST_HARNESS_MAIN