338 lines
7.1 KiB
C
338 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Based on Christian Brauner's clone3() example */
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#define _GNU_SOURCE
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#include <errno.h>
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#include <inttypes.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <sched.h>
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#include "../kselftest.h"
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#include "clone3_selftests.h"
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enum test_mode {
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CLONE3_ARGS_NO_TEST,
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CLONE3_ARGS_ALL_0,
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CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
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CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
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CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
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CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
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};
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static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode)
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{
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struct __clone_args args = {
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.flags = flags,
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.exit_signal = SIGCHLD,
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};
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struct clone_args_extended {
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struct __clone_args args;
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__aligned_u64 excess_space[2];
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} args_ext;
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pid_t pid = -1;
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int status;
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memset(&args_ext, 0, sizeof(args_ext));
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if (size > sizeof(struct __clone_args))
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args_ext.excess_space[1] = 1;
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if (size == 0)
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size = sizeof(struct __clone_args);
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switch (test_mode) {
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case CLONE3_ARGS_NO_TEST:
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/*
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* Uses default 'flags' and 'SIGCHLD'
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* assignment.
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*/
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break;
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case CLONE3_ARGS_ALL_0:
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args.flags = 0;
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args.exit_signal = 0;
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break;
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case CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG:
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args.exit_signal = 0xbadc0ded00000000ULL;
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break;
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case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG:
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args.exit_signal = 0x0000000080000000ULL;
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break;
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case CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG:
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args.exit_signal = 0x0000000000000100ULL;
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break;
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case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG:
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args.exit_signal = 0x00000000000000f0ULL;
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break;
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}
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memcpy(&args_ext.args, &args, sizeof(struct __clone_args));
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pid = sys_clone3((struct __clone_args *)&args_ext, size);
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if (pid < 0) {
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ksft_print_msg("%s - Failed to create new process\n",
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strerror(errno));
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return -errno;
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}
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if (pid == 0) {
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ksft_print_msg("I am the child, my PID is %d\n", getpid());
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_exit(EXIT_SUCCESS);
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}
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ksft_print_msg("I am the parent (%d). My child's pid is %d\n",
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getpid(), pid);
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if (waitpid(-1, &status, __WALL) < 0) {
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ksft_print_msg("Child returned %s\n", strerror(errno));
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return -errno;
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}
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if (WEXITSTATUS(status))
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return WEXITSTATUS(status);
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return 0;
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}
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static bool test_clone3(uint64_t flags, size_t size, int expected,
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enum test_mode test_mode)
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{
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int ret;
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ksft_print_msg(
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"[%d] Trying clone3() with flags %#" PRIx64 " (size %zu)\n",
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getpid(), flags, size);
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ret = call_clone3(flags, size, test_mode);
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ksft_print_msg("[%d] clone3() with flags says: %d expected %d\n",
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getpid(), ret, expected);
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if (ret != expected) {
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ksft_print_msg(
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"[%d] Result (%d) is different than expected (%d)\n",
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getpid(), ret, expected);
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return false;
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}
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return true;
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}
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typedef bool (*filter_function)(void);
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typedef size_t (*size_function)(void);
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static bool not_root(void)
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{
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if (getuid() != 0) {
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ksft_print_msg("Not running as root\n");
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return true;
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}
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return false;
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}
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static bool no_timenamespace(void)
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{
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if (not_root())
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return true;
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if (!access("/proc/self/ns/time", F_OK))
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return false;
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ksft_print_msg("Time namespaces are not supported\n");
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return true;
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}
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static size_t page_size_plus_8(void)
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{
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return getpagesize() + 8;
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}
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struct test {
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const char *name;
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uint64_t flags;
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size_t size;
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size_function size_function;
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int expected;
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enum test_mode test_mode;
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filter_function filter;
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};
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static const struct test tests[] = {
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{
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.name = "simple clone3()",
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.flags = 0,
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.size = 0,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "clone3() in a new PID_NS",
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.flags = CLONE_NEWPID,
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.size = 0,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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.filter = not_root,
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},
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{
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.name = "CLONE_ARGS_SIZE_VER0",
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.flags = 0,
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.size = CLONE_ARGS_SIZE_VER0,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "CLONE_ARGS_SIZE_VER0 - 8",
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.flags = 0,
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.size = CLONE_ARGS_SIZE_VER0 - 8,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "sizeof(struct clone_args) + 8",
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.flags = 0,
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.size = sizeof(struct __clone_args) + 8,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "exit_signal with highest 32 bits non-zero",
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.flags = 0,
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.size = 0,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
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},
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{
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.name = "negative 32-bit exit_signal",
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.flags = 0,
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.size = 0,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
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},
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{
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.name = "exit_signal not fitting into CSIGNAL mask",
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.flags = 0,
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.size = 0,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
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},
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{
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.name = "NSIG < exit_signal < CSIG",
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.flags = 0,
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.size = 0,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
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},
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{
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.name = "Arguments sizeof(struct clone_args) + 8",
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.flags = 0,
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.size = sizeof(struct __clone_args) + 8,
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.expected = 0,
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.test_mode = CLONE3_ARGS_ALL_0,
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},
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{
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.name = "Arguments sizeof(struct clone_args) + 16",
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.flags = 0,
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.size = sizeof(struct __clone_args) + 16,
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.expected = -E2BIG,
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.test_mode = CLONE3_ARGS_ALL_0,
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},
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{
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.name = "Arguments sizeof(struct clone_arg) * 2",
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.flags = 0,
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.size = sizeof(struct __clone_args) + 16,
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.expected = -E2BIG,
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.test_mode = CLONE3_ARGS_ALL_0,
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},
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{
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.name = "Arguments > page size",
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.flags = 0,
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.size_function = page_size_plus_8,
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.expected = -E2BIG,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "CLONE_ARGS_SIZE_VER0 in a new PID NS",
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.flags = CLONE_NEWPID,
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.size = CLONE_ARGS_SIZE_VER0,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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.filter = not_root,
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},
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{
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.name = "CLONE_ARGS_SIZE_VER0 - 8 in a new PID NS",
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.flags = CLONE_NEWPID,
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.size = CLONE_ARGS_SIZE_VER0 - 8,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "sizeof(struct clone_args) + 8 in a new PID NS",
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.flags = CLONE_NEWPID,
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.size = sizeof(struct __clone_args) + 8,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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.filter = not_root,
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},
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{
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.name = "Arguments > page size in a new PID NS",
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.flags = CLONE_NEWPID,
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.size_function = page_size_plus_8,
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.expected = -E2BIG,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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{
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.name = "New time NS",
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.flags = CLONE_NEWTIME,
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.size = 0,
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.expected = 0,
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.test_mode = CLONE3_ARGS_NO_TEST,
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.filter = no_timenamespace,
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},
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{
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.name = "exit signal (SIGCHLD) in flags",
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.flags = SIGCHLD,
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.size = 0,
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.expected = -EINVAL,
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.test_mode = CLONE3_ARGS_NO_TEST,
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},
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};
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int main(int argc, char *argv[])
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{
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size_t size;
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int i;
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ksft_print_header();
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ksft_set_plan(ARRAY_SIZE(tests));
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test_clone3_supported();
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for (i = 0; i < ARRAY_SIZE(tests); i++) {
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if (tests[i].filter && tests[i].filter()) {
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ksft_test_result_skip("%s\n", tests[i].name);
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continue;
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}
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if (tests[i].size_function)
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size = tests[i].size_function();
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else
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size = tests[i].size;
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ksft_print_msg("Running test '%s'\n", tests[i].name);
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ksft_test_result(test_clone3(tests[i].flags, size,
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tests[i].expected,
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tests[i].test_mode),
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"%s\n", tests[i].name);
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}
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ksft_finished();
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}
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