398 lines
9.7 KiB
C
398 lines
9.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Based on Christian Brauner's clone3() example.
|
||
|
|
* These tests are assuming to be running in the host's
|
||
|
|
* PID namespace.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define _GNU_SOURCE
|
||
|
|
#include <errno.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <sys/syscall.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/un.h>
|
||
|
|
#include <sys/wait.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <sched.h>
|
||
|
|
|
||
|
|
#include "../kselftest.h"
|
||
|
|
#include "clone3_selftests.h"
|
||
|
|
|
||
|
|
#ifndef MAX_PID_NS_LEVEL
|
||
|
|
#define MAX_PID_NS_LEVEL 32
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int pipe_1[2];
|
||
|
|
static int pipe_2[2];
|
||
|
|
|
||
|
|
static void child_exit(int ret)
|
||
|
|
{
|
||
|
|
fflush(stdout);
|
||
|
|
fflush(stderr);
|
||
|
|
_exit(ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int call_clone3_set_tid(pid_t *set_tid,
|
||
|
|
size_t set_tid_size,
|
||
|
|
int flags,
|
||
|
|
int expected_pid,
|
||
|
|
bool wait_for_it)
|
||
|
|
{
|
||
|
|
int status;
|
||
|
|
pid_t pid = -1;
|
||
|
|
|
||
|
|
struct __clone_args args = {
|
||
|
|
.flags = flags,
|
||
|
|
.exit_signal = SIGCHLD,
|
||
|
|
.set_tid = ptr_to_u64(set_tid),
|
||
|
|
.set_tid_size = set_tid_size,
|
||
|
|
};
|
||
|
|
|
||
|
|
pid = sys_clone3(&args, sizeof(args));
|
||
|
|
if (pid < 0) {
|
||
|
|
ksft_print_msg("%s - Failed to create new process\n",
|
||
|
|
strerror(errno));
|
||
|
|
return -errno;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pid == 0) {
|
||
|
|
int ret;
|
||
|
|
char tmp = 0;
|
||
|
|
int exit_code = EXIT_SUCCESS;
|
||
|
|
|
||
|
|
ksft_print_msg("I am the child, my PID is %d (expected %d)\n",
|
||
|
|
getpid(), set_tid[0]);
|
||
|
|
if (wait_for_it) {
|
||
|
|
ksft_print_msg("[%d] Child is ready and waiting\n",
|
||
|
|
getpid());
|
||
|
|
|
||
|
|
/* Signal the parent that the child is ready */
|
||
|
|
close(pipe_1[0]);
|
||
|
|
ret = write(pipe_1[1], &tmp, 1);
|
||
|
|
if (ret != 1) {
|
||
|
|
ksft_print_msg(
|
||
|
|
"Writing to pipe returned %d", ret);
|
||
|
|
exit_code = EXIT_FAILURE;
|
||
|
|
}
|
||
|
|
close(pipe_1[1]);
|
||
|
|
close(pipe_2[1]);
|
||
|
|
ret = read(pipe_2[0], &tmp, 1);
|
||
|
|
if (ret != 1) {
|
||
|
|
ksft_print_msg(
|
||
|
|
"Reading from pipe returned %d", ret);
|
||
|
|
exit_code = EXIT_FAILURE;
|
||
|
|
}
|
||
|
|
close(pipe_2[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (set_tid[0] != getpid())
|
||
|
|
child_exit(EXIT_FAILURE);
|
||
|
|
child_exit(exit_code);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (expected_pid == 0 || expected_pid == pid) {
|
||
|
|
ksft_print_msg("I am the parent (%d). My child's pid is %d\n",
|
||
|
|
getpid(), pid);
|
||
|
|
} else {
|
||
|
|
ksft_print_msg(
|
||
|
|
"Expected child pid %d does not match actual pid %d\n",
|
||
|
|
expected_pid, pid);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (waitpid(pid, &status, 0) < 0) {
|
||
|
|
ksft_print_msg("Child returned %s\n", strerror(errno));
|
||
|
|
return -errno;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!WIFEXITED(status))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return WEXITSTATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void test_clone3_set_tid(pid_t *set_tid,
|
||
|
|
size_t set_tid_size,
|
||
|
|
int flags,
|
||
|
|
int expected,
|
||
|
|
int expected_pid,
|
||
|
|
bool wait_for_it)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ksft_print_msg(
|
||
|
|
"[%d] Trying clone3() with CLONE_SET_TID to %d and 0x%x\n",
|
||
|
|
getpid(), set_tid[0], flags);
|
||
|
|
ret = call_clone3_set_tid(set_tid, set_tid_size, flags, expected_pid,
|
||
|
|
wait_for_it);
|
||
|
|
ksft_print_msg(
|
||
|
|
"[%d] clone3() with CLONE_SET_TID %d says :%d - expected %d\n",
|
||
|
|
getpid(), set_tid[0], ret, expected);
|
||
|
|
if (ret != expected)
|
||
|
|
ksft_test_result_fail(
|
||
|
|
"[%d] Result (%d) is different than expected (%d)\n",
|
||
|
|
getpid(), ret, expected);
|
||
|
|
else
|
||
|
|
ksft_test_result_pass(
|
||
|
|
"[%d] Result (%d) matches expectation (%d)\n",
|
||
|
|
getpid(), ret, expected);
|
||
|
|
}
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
FILE *f;
|
||
|
|
char buf;
|
||
|
|
char *line;
|
||
|
|
int status;
|
||
|
|
int ret = -1;
|
||
|
|
size_t len = 0;
|
||
|
|
int pid_max = 0;
|
||
|
|
uid_t uid = getuid();
|
||
|
|
char proc_path[100] = {0};
|
||
|
|
pid_t pid, ns1, ns2, ns3, ns_pid;
|
||
|
|
pid_t set_tid[MAX_PID_NS_LEVEL * 2];
|
||
|
|
|
||
|
|
ksft_print_header();
|
||
|
|
ksft_set_plan(29);
|
||
|
|
test_clone3_supported();
|
||
|
|
|
||
|
|
if (pipe(pipe_1) < 0 || pipe(pipe_2) < 0)
|
||
|
|
ksft_exit_fail_msg("pipe() failed\n");
|
||
|
|
|
||
|
|
f = fopen("/proc/sys/kernel/pid_max", "r");
|
||
|
|
if (f == NULL)
|
||
|
|
ksft_exit_fail_msg(
|
||
|
|
"%s - Could not open /proc/sys/kernel/pid_max\n",
|
||
|
|
strerror(errno));
|
||
|
|
fscanf(f, "%d", &pid_max);
|
||
|
|
fclose(f);
|
||
|
|
ksft_print_msg("/proc/sys/kernel/pid_max %d\n", pid_max);
|
||
|
|
|
||
|
|
/* Try invalid settings */
|
||
|
|
memset(&set_tid, 0, sizeof(set_tid));
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL + 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL * 2, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL * 2 + 1, 0,
|
||
|
|
-EINVAL, 0, 0);
|
||
|
|
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL * 42, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This can actually work if this test running in a MAX_PID_NS_LEVEL - 1
|
||
|
|
* nested PID namespace.
|
||
|
|
*/
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL - 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
memset(&set_tid, 0xff, sizeof(set_tid));
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL + 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL * 2, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL * 2 + 1, 0,
|
||
|
|
-EINVAL, 0, 0);
|
||
|
|
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL * 42, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This can actually work if this test running in a MAX_PID_NS_LEVEL - 1
|
||
|
|
* nested PID namespace.
|
||
|
|
*/
|
||
|
|
test_clone3_set_tid(set_tid, MAX_PID_NS_LEVEL - 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
memset(&set_tid, 0, sizeof(set_tid));
|
||
|
|
/* Try with an invalid PID */
|
||
|
|
set_tid[0] = 0;
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
set_tid[0] = -1;
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/* Claim that the set_tid array actually contains 2 elements. */
|
||
|
|
test_clone3_set_tid(set_tid, 2, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/* Try it in a new PID namespace */
|
||
|
|
if (uid == 0)
|
||
|
|
test_clone3_set_tid(set_tid, 1, CLONE_NEWPID, -EINVAL, 0, 0);
|
||
|
|
else
|
||
|
|
ksft_test_result_skip("Clone3() with set_tid requires root\n");
|
||
|
|
|
||
|
|
/* Try with a valid PID (1) this should return -EEXIST. */
|
||
|
|
set_tid[0] = 1;
|
||
|
|
if (uid == 0)
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, -EEXIST, 0, 0);
|
||
|
|
else
|
||
|
|
ksft_test_result_skip("Clone3() with set_tid requires root\n");
|
||
|
|
|
||
|
|
/* Try it in a new PID namespace */
|
||
|
|
if (uid == 0)
|
||
|
|
test_clone3_set_tid(set_tid, 1, CLONE_NEWPID, 0, 0, 0);
|
||
|
|
else
|
||
|
|
ksft_test_result_skip("Clone3() with set_tid requires root\n");
|
||
|
|
|
||
|
|
/* pid_max should fail everywhere */
|
||
|
|
set_tid[0] = pid_max;
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
if (uid == 0)
|
||
|
|
test_clone3_set_tid(set_tid, 1, CLONE_NEWPID, -EINVAL, 0, 0);
|
||
|
|
else
|
||
|
|
ksft_test_result_skip("Clone3() with set_tid requires root\n");
|
||
|
|
|
||
|
|
if (uid != 0) {
|
||
|
|
/*
|
||
|
|
* All remaining tests require root. Tell the framework
|
||
|
|
* that all those tests are skipped as non-root.
|
||
|
|
*/
|
||
|
|
ksft_cnt.ksft_xskip += ksft_plan - ksft_test_num();
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Find the current active PID */
|
||
|
|
pid = fork();
|
||
|
|
if (pid == 0) {
|
||
|
|
ksft_print_msg("Child has PID %d\n", getpid());
|
||
|
|
child_exit(EXIT_SUCCESS);
|
||
|
|
}
|
||
|
|
if (waitpid(pid, &status, 0) < 0)
|
||
|
|
ksft_exit_fail_msg("Waiting for child %d failed", pid);
|
||
|
|
|
||
|
|
/* After the child has finished, its PID should be free. */
|
||
|
|
set_tid[0] = pid;
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, 0, 0, 0);
|
||
|
|
|
||
|
|
/* This should fail as there is no PID 1 in that namespace */
|
||
|
|
test_clone3_set_tid(set_tid, 1, CLONE_NEWPID, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Creating a process with PID 1 in the newly created most nested
|
||
|
|
* PID namespace and PID 'pid' in the parent PID namespace. This
|
||
|
|
* needs to work.
|
||
|
|
*/
|
||
|
|
set_tid[0] = 1;
|
||
|
|
set_tid[1] = pid;
|
||
|
|
test_clone3_set_tid(set_tid, 2, CLONE_NEWPID, 0, pid, 0);
|
||
|
|
|
||
|
|
ksft_print_msg("unshare PID namespace\n");
|
||
|
|
if (unshare(CLONE_NEWPID) == -1)
|
||
|
|
ksft_exit_fail_msg("unshare(CLONE_NEWPID) failed: %s\n",
|
||
|
|
strerror(errno));
|
||
|
|
|
||
|
|
set_tid[0] = pid;
|
||
|
|
|
||
|
|
/* This should fail as there is no PID 1 in that namespace */
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/* Let's create a PID 1 */
|
||
|
|
ns_pid = fork();
|
||
|
|
if (ns_pid == 0) {
|
||
|
|
/*
|
||
|
|
* This and the next test cases check that all pid-s are
|
||
|
|
* released on error paths.
|
||
|
|
*/
|
||
|
|
set_tid[0] = 43;
|
||
|
|
set_tid[1] = -1;
|
||
|
|
test_clone3_set_tid(set_tid, 2, 0, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
set_tid[0] = 43;
|
||
|
|
set_tid[1] = pid;
|
||
|
|
test_clone3_set_tid(set_tid, 2, 0, 0, 43, 0);
|
||
|
|
|
||
|
|
ksft_print_msg("Child in PID namespace has PID %d\n", getpid());
|
||
|
|
set_tid[0] = 2;
|
||
|
|
test_clone3_set_tid(set_tid, 1, 0, 0, 2, 0);
|
||
|
|
|
||
|
|
set_tid[0] = 1;
|
||
|
|
set_tid[1] = -1;
|
||
|
|
set_tid[2] = pid;
|
||
|
|
/* This should fail as there is invalid PID at level '1'. */
|
||
|
|
test_clone3_set_tid(set_tid, 3, CLONE_NEWPID, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
set_tid[0] = 1;
|
||
|
|
set_tid[1] = 42;
|
||
|
|
set_tid[2] = pid;
|
||
|
|
/*
|
||
|
|
* This should fail as there are not enough active PID
|
||
|
|
* namespaces. Again assuming this is running in the host's
|
||
|
|
* PID namespace. Not yet nested.
|
||
|
|
*/
|
||
|
|
test_clone3_set_tid(set_tid, 4, CLONE_NEWPID, -EINVAL, 0, 0);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This should work and from the parent we should see
|
||
|
|
* something like 'NSpid: pid 42 1'.
|
||
|
|
*/
|
||
|
|
test_clone3_set_tid(set_tid, 3, CLONE_NEWPID, 0, 42, true);
|
||
|
|
|
||
|
|
child_exit(ksft_cnt.ksft_fail);
|
||
|
|
}
|
||
|
|
|
||
|
|
close(pipe_1[1]);
|
||
|
|
close(pipe_2[0]);
|
||
|
|
while (read(pipe_1[0], &buf, 1) > 0) {
|
||
|
|
ksft_print_msg("[%d] Child is ready and waiting\n", getpid());
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
snprintf(proc_path, sizeof(proc_path), "/proc/%d/status", pid);
|
||
|
|
f = fopen(proc_path, "r");
|
||
|
|
if (f == NULL)
|
||
|
|
ksft_exit_fail_msg(
|
||
|
|
"%s - Could not open %s\n",
|
||
|
|
strerror(errno), proc_path);
|
||
|
|
|
||
|
|
while (getline(&line, &len, f) != -1) {
|
||
|
|
if (strstr(line, "NSpid")) {
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Verify that all generated PIDs are as expected. */
|
||
|
|
i = sscanf(line, "NSpid:\t%d\t%d\t%d",
|
||
|
|
&ns3, &ns2, &ns1);
|
||
|
|
if (i != 3) {
|
||
|
|
ksft_print_msg(
|
||
|
|
"Unexpected 'NSPid:' entry: %s",
|
||
|
|
line);
|
||
|
|
ns1 = ns2 = ns3 = 0;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fclose(f);
|
||
|
|
free(line);
|
||
|
|
close(pipe_2[0]);
|
||
|
|
|
||
|
|
/* Tell the clone3()'d child to finish. */
|
||
|
|
write(pipe_2[1], &buf, 1);
|
||
|
|
close(pipe_2[1]);
|
||
|
|
|
||
|
|
if (waitpid(ns_pid, &status, 0) < 0) {
|
||
|
|
ksft_print_msg("Child returned %s\n", strerror(errno));
|
||
|
|
ret = -errno;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!WIFEXITED(status))
|
||
|
|
ksft_test_result_fail("Child error\n");
|
||
|
|
|
||
|
|
ksft_cnt.ksft_pass += 6 - (ksft_cnt.ksft_fail - WEXITSTATUS(status));
|
||
|
|
ksft_cnt.ksft_fail = WEXITSTATUS(status);
|
||
|
|
|
||
|
|
if (ns3 == pid && ns2 == 42 && ns1 == 1)
|
||
|
|
ksft_test_result_pass(
|
||
|
|
"PIDs in all namespaces as expected (%d,%d,%d)\n",
|
||
|
|
ns3, ns2, ns1);
|
||
|
|
else
|
||
|
|
ksft_test_result_fail(
|
||
|
|
"PIDs in all namespaces not as expected (%d,%d,%d)\n",
|
||
|
|
ns3, ns2, ns1);
|
||
|
|
out:
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
return !ret ? ksft_exit_pass() : ksft_exit_fail();
|
||
|
|
}
|