107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <sched.h>
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#include <sys/mount.h>
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#include <unistd.h>
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#include "fd-util.h"
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#include "fs-util.h"
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#include "fuzz.h"
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#include "log.h"
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#include "mkdir.h"
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#include "rm-rf.h"
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#include "string-util.h"
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#include "tests.h"
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#include "udev-rules.h"
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static struct fakefs {
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const char *target;
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bool ignore_mount_error;
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bool is_mounted;
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} fakefss[] = {
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{ "/sys", false, false },
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{ "/dev", false, false },
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{ "/run", false, false },
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{ "/etc", false, false },
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{ UDEVLIBEXECDIR "/rules.d", true, false },
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};
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static int setup_mount_namespace(void) {
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static thread_local bool is_namespaced = false;
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if (is_namespaced)
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return 1;
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if (unshare(CLONE_NEWNS) < 0)
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return log_error_errno(errno, "Failed to call unshare(): %m");
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if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
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return log_error_errno(errno, "Failed to mount / as private: %m");
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is_namespaced = true;
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return 1;
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}
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static int setup_fake_filesystems(const char *runtime_dir) {
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for (unsigned i = 0; i < ELEMENTSOF(fakefss); i++) {
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if (mount(runtime_dir, fakefss[i].target, NULL, MS_BIND, NULL) < 0) {
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log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "Failed to mount %s: %m", fakefss[i].target);
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if (!fakefss[i].ignore_mount_error)
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return -errno;
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} else
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fakefss[i].is_mounted = true;
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}
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return 0;
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}
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static int cleanup_fake_filesystems(const char *runtime_dir) {
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for (unsigned i = 0; i < ELEMENTSOF(fakefss); i++) {
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if (!fakefss[i].is_mounted)
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continue;
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if (umount(fakefss[i].target) < 0) {
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log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "Failed to umount %s: %m", fakefss[i].target);
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if (!fakefss[i].ignore_mount_error)
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return -errno;
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} else
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fakefss[i].is_mounted = false;
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}
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return 0;
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}
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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_cleanup_(udev_rules_freep) UdevRules *rules = NULL;
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_cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
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FILE *f = NULL;
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(void) setup_mount_namespace();
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assert_se(runtime_dir = setup_fake_runtime_dir());
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if (setup_fake_filesystems(runtime_dir) < 0) {
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#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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return EXIT_TEST_SKIP;
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#endif
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}
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if (!getenv("SYSTEMD_LOG_LEVEL")) {
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log_set_max_level_realm(LOG_REALM_UDEV, LOG_CRIT);
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log_set_max_level_realm(LOG_REALM_SYSTEMD, LOG_CRIT);
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}
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assert_se(mkdir_p("/etc/udev/rules.d", 0755) >= 0);
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f = fopen("/etc/udev/rules.d/fuzz.rules", "we");
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assert_se(f);
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if (size != 0)
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assert_se(fwrite(data, size, 1, f) == 1);
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assert_se(fclose(f) == 0);
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assert_se(udev_rules_new(&rules, RESOLVE_NAME_EARLY) == 0);
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assert_se(cleanup_fake_filesystems(runtime_dir) >= 0);
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return 0;
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}
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