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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e953aeaa91
As the UAPI headers start to appear in distros, we need to avoid outdated versions of struct clone_args to be able to test modern features, named "struct __clone_args". Additionally update the struct size macro names to match UAPI names. Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/lkml/20200921075432.u4gis3s2o5qrsb5g@wittgenstein/ Signed-off-by: Kees Cook <keescook@chromium.org>
195 lines
5.2 KiB
C
195 lines
5.2 KiB
C
// 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 <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_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 void 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_test_result_fail(
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"[%d] Result (%d) is different than expected (%d)\n",
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getpid(), ret, expected);
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else
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ksft_test_result_pass(
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"[%d] Result (%d) matches expectation (%d)\n",
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getpid(), ret, expected);
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}
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int main(int argc, char *argv[])
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{
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pid_t pid;
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uid_t uid = getuid();
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ksft_print_header();
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ksft_set_plan(17);
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test_clone3_supported();
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/* Just a simple clone3() should return 0.*/
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test_clone3(0, 0, 0, CLONE3_ARGS_NO_TEST);
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/* Do a clone3() in a new PID NS.*/
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if (uid == 0)
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test_clone3(CLONE_NEWPID, 0, 0, CLONE3_ARGS_NO_TEST);
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else
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ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
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/* Do a clone3() with CLONE_ARGS_SIZE_VER0. */
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test_clone3(0, CLONE_ARGS_SIZE_VER0, 0, CLONE3_ARGS_NO_TEST);
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/* Do a clone3() with CLONE_ARGS_SIZE_VER0 - 8 */
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test_clone3(0, CLONE_ARGS_SIZE_VER0 - 8, -EINVAL, CLONE3_ARGS_NO_TEST);
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/* Do a clone3() with sizeof(struct clone_args) + 8 */
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test_clone3(0, sizeof(struct __clone_args) + 8, 0, CLONE3_ARGS_NO_TEST);
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/* Do a clone3() with exit_signal having highest 32 bits non-zero */
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test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG);
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/* Do a clone3() with negative 32-bit exit_signal */
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test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG);
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/* Do a clone3() with exit_signal not fitting into CSIGNAL mask */
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test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG);
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/* Do a clone3() with NSIG < exit_signal < CSIG */
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test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG);
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test_clone3(0, sizeof(struct __clone_args) + 8, 0, CLONE3_ARGS_ALL_0);
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test_clone3(0, sizeof(struct __clone_args) + 16, -E2BIG,
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CLONE3_ARGS_ALL_0);
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test_clone3(0, sizeof(struct __clone_args) * 2, -E2BIG,
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CLONE3_ARGS_ALL_0);
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/* Do a clone3() with > page size */
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test_clone3(0, getpagesize() + 8, -E2BIG, CLONE3_ARGS_NO_TEST);
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/* Do a clone3() with CLONE_ARGS_SIZE_VER0 in a new PID NS. */
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if (uid == 0)
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test_clone3(CLONE_NEWPID, CLONE_ARGS_SIZE_VER0, 0,
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CLONE3_ARGS_NO_TEST);
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else
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ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
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/* Do a clone3() with CLONE_ARGS_SIZE_VER0 - 8 in a new PID NS */
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test_clone3(CLONE_NEWPID, CLONE_ARGS_SIZE_VER0 - 8, -EINVAL,
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CLONE3_ARGS_NO_TEST);
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/* Do a clone3() with sizeof(struct clone_args) + 8 in a new PID NS */
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if (uid == 0)
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test_clone3(CLONE_NEWPID, sizeof(struct __clone_args) + 8, 0,
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CLONE3_ARGS_NO_TEST);
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else
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ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
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/* Do a clone3() with > page size in a new PID NS */
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test_clone3(CLONE_NEWPID, getpagesize() + 8, -E2BIG,
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CLONE3_ARGS_NO_TEST);
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return !ksft_get_fail_cnt() ? ksft_exit_pass() : ksft_exit_fail();
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}
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