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// 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 "pidfd.h"
#include "../kselftest_harness.h"
FIXTURE(pidfd_info)
{
pid_t child_pid1;
int child_pidfd1;
pid_t child_pid2;
int child_pidfd2;
pid_t child_pid3;
int child_pidfd3;
pid_t child_pid4;
int child_pidfd4;
};
FIXTURE_SETUP(pidfd_info)
{
int ret;
int ipc_sockets[2];
char c;
ret = socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets);
EXPECT_EQ(ret, 0);
self->child_pid1 = create_child(&self->child_pidfd1, 0);
EXPECT_GE(self->child_pid1, 0);
if (self->child_pid1 == 0) {
close(ipc_sockets[0]);
if (write_nointr(ipc_sockets[1], "1", 1) < 0)
_exit(EXIT_FAILURE);
close(ipc_sockets[1]);
pause();
_exit(EXIT_SUCCESS);
}
EXPECT_EQ(close(ipc_sockets[1]), 0);
ASSERT_EQ(read_nointr(ipc_sockets[0], &c, 1), 1);
EXPECT_EQ(close(ipc_sockets[0]), 0);
/* SIGKILL but don't reap. */
EXPECT_EQ(sys_pidfd_send_signal(self->child_pidfd1, SIGKILL, NULL, 0), 0);
ret = socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets);
EXPECT_EQ(ret, 0);
self->child_pid2 = create_child(&self->child_pidfd2, 0);
EXPECT_GE(self->child_pid2, 0);
if (self->child_pid2 == 0) {
close(ipc_sockets[0]);
if (write_nointr(ipc_sockets[1], "1", 1) < 0)
_exit(EXIT_FAILURE);
close(ipc_sockets[1]);
pause();
_exit(EXIT_SUCCESS);
}
EXPECT_EQ(close(ipc_sockets[1]), 0);
ASSERT_EQ(read_nointr(ipc_sockets[0], &c, 1), 1);
EXPECT_EQ(close(ipc_sockets[0]), 0);
/* SIGKILL and reap. */
EXPECT_EQ(sys_pidfd_send_signal(self->child_pidfd2, SIGKILL, NULL, 0), 0);
EXPECT_EQ(sys_waitid(P_PID, self->child_pid2, NULL, WEXITED), 0);
self->child_pid3 = create_child(&self->child_pidfd3, CLONE_NEWUSER | CLONE_NEWPID);
EXPECT_GE(self->child_pid3, 0);
if (self->child_pid3 == 0)
_exit(EXIT_SUCCESS);
self->child_pid4 = create_child(&self->child_pidfd4, CLONE_NEWUSER | CLONE_NEWPID);
EXPECT_GE(self->child_pid4, 0);
if (self->child_pid4 == 0)
_exit(EXIT_SUCCESS);
EXPECT_EQ(sys_waitid(P_PID, self->child_pid4, NULL, WEXITED), 0);
}
FIXTURE_TEARDOWN(pidfd_info)
{
sys_pidfd_send_signal(self->child_pidfd1, SIGKILL, NULL, 0);
if (self->child_pidfd1 >= 0)
EXPECT_EQ(0, close(self->child_pidfd1));
sys_waitid(P_PID, self->child_pid1, NULL, WEXITED);
sys_pidfd_send_signal(self->child_pidfd2, SIGKILL, NULL, 0);
if (self->child_pidfd2 >= 0)
EXPECT_EQ(0, close(self->child_pidfd2));
sys_waitid(P_PID, self->child_pid2, NULL, WEXITED);
sys_waitid(P_PID, self->child_pid3, NULL, WEXITED);
sys_waitid(P_PID, self->child_pid4, NULL, WEXITED);
}
TEST_F(pidfd_info, sigkill_exit)
{
struct pidfd_info info = {
.mask = PIDFD_INFO_CGROUPID,
};
/* Process has exited but not been reaped so this must work. */
ASSERT_EQ(ioctl(self->child_pidfd1, PIDFD_GET_INFO, &info), 0);
info.mask = PIDFD_INFO_CGROUPID | PIDFD_INFO_EXIT;
ASSERT_EQ(ioctl(self->child_pidfd1, PIDFD_GET_INFO, &info), 0);
ASSERT_TRUE(!!(info.mask & PIDFD_INFO_CREDS));
/* Process has exited but not been reaped, so no PIDFD_INFO_EXIT information yet. */
ASSERT_FALSE(!!(info.mask & PIDFD_INFO_EXIT));
}
TEST_HARNESS_MAIN
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