// https://syzkaller.appspot.com/bug?id=0896bca762e93f26a3922dc0822313a7be65a3c1 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif static unsigned long long procid; static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } struct fs_image_segment { void* data; uintptr_t size; uintptr_t offset; }; #define IMAGE_MAX_SEGMENTS 4096 #define IMAGE_MAX_SIZE (129 << 20) static unsigned long fs_image_segment_check(unsigned long size, unsigned long nsegs, struct fs_image_segment* segs) { if (nsegs > IMAGE_MAX_SEGMENTS) nsegs = IMAGE_MAX_SEGMENTS; for (size_t i = 0; i < nsegs; i++) { if (segs[i].size > IMAGE_MAX_SIZE) segs[i].size = IMAGE_MAX_SIZE; segs[i].offset %= IMAGE_MAX_SIZE; if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size) segs[i].offset = IMAGE_MAX_SIZE - segs[i].size; if (size < segs[i].offset + segs[i].offset) size = segs[i].offset + segs[i].offset; } if (size > IMAGE_MAX_SIZE) size = IMAGE_MAX_SIZE; return size; } static int setup_loop_device(long unsigned size, long unsigned nsegs, struct fs_image_segment* segs, const char* loopname, int* memfd_p, int* loopfd_p) { int err = 0, loopfd = -1; size = fs_image_segment_check(size, nsegs, segs); int memfd = syscall(__NR_memfd_create, "syzkaller", 0); if (memfd == -1) { err = errno; goto error; } if (ftruncate(memfd, size)) { err = errno; goto error_close_memfd; } for (size_t i = 0; i < nsegs; i++) { if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) { } } loopfd = open(loopname, O_RDWR); if (loopfd == -1) { err = errno; goto error_close_memfd; } if (ioctl(loopfd, LOOP_SET_FD, memfd)) { if (errno != EBUSY) { err = errno; goto error_close_loop; } ioctl(loopfd, LOOP_CLR_FD, 0); usleep(1000); if (ioctl(loopfd, LOOP_SET_FD, memfd)) { err = errno; goto error_close_loop; } } *memfd_p = memfd; *loopfd_p = loopfd; return 0; error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return -1; } static long syz_mount_image(volatile long fsarg, volatile long dir, volatile unsigned long size, volatile unsigned long nsegs, volatile long segments, volatile long flags, volatile long optsarg) { struct fs_image_segment* segs = (struct fs_image_segment*)segments; int res = -1, err = 0, loopfd = -1, memfd = -1, need_loop_device = !!segs; char* mount_opts = (char*)optsarg; char* target = (char*)dir; char* fs = (char*)fsarg; char* source = NULL; char loopname[64]; if (need_loop_device) { memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(size, nsegs, segs, loopname, &memfd, &loopfd) == -1) return -1; source = loopname; } mkdir(target, 0777); char opts[256]; memset(opts, 0, sizeof(opts)); if (strlen(mount_opts) > (sizeof(opts) - 32)) { } strncpy(opts, mount_opts, sizeof(opts) - 32); if (strcmp(fs, "iso9660") == 0) { flags |= MS_RDONLY; } else if (strncmp(fs, "ext", 3) == 0) { if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } res = mount(source, target, fs, flags, opts); if (res == -1) { err = errno; goto error_clear_loop; } res = open(target, O_RDONLY | O_DIRECTORY); if (res == -1) { err = errno; } error_clear_loop: if (need_loop_device) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); close(memfd); } errno = err; return res; } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { int iter = 0; DIR* dp = 0; retry: while (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } struct dirent* ep = 0; while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW)) exit(1); } } closedir(dp); for (int i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } exit(1); } } static int inject_fault(int nth) { int fd; fd = open("/proc/thread-self/fail-nth", O_RDWR); if (fd == -1) exit(1); char buf[16]; sprintf(buf, "%d", nth); if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) exit(1); return fd; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void reset_loop() { char buf[64]; snprintf(buf, sizeof(buf), "/dev/loop%llu", procid); int loopfd = open(buf, O_RDWR); if (loopfd != -1) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); if (symlink("/dev/binderfs", "./binderfs")) { } } static void setup_fault() { static struct { const char* file; const char* val; bool fatal; } files[] = { {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true}, {"/sys/kernel/debug/fail_futex/ignore-private", "N", false}, {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false}, {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false}, {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false}, }; unsigned i; for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) { if (!write_file(files[i].file, files[i].val)) { if (files[i].fatal) exit(1); } } } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); reset_loop(); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } remove_dir(cwdbuf); } } void execute_one(void) { memcpy((void*)0x20000000, "exfat\000", 6); memcpy((void*)0x20000100, "./file0\000", 8); *(uint64_t*)0x20000200 = 0x20010000; memcpy((void*)0x20010000, "\xeb\x76\x90\x45\x58\x46\x41\x54\x20\x20\x20\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x08" "\x00\x00\x00\x88\x00\x00\x00\x0f\x00\x00\x00\x05\x00\x00\x00\x34\x12" "\x34\x12\x00\x01\x00\x00\x09\x03\x01\x80", 112); *(uint64_t*)0x20000208 = 0x70; *(uint64_t*)0x20000210 = 0; *(uint64_t*)0x20000218 = 0x20010100; memcpy((void*)0x20010100, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x20000220 = 0x20; *(uint64_t*)0x20000228 = 0x1e0; *(uint64_t*)0x20000230 = 0x20010200; memcpy((void*)0x20010200, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x20000238 = 0x20; *(uint64_t*)0x20000240 = 0x3e0; *(uint64_t*)0x20000248 = 0x20010300; memcpy((void*)0x20010300, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x20000250 = 0x20; *(uint64_t*)0x20000258 = 0x5e0; *(uint64_t*)0x20000260 = 0x20010400; memcpy((void*)0x20010400, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x20000268 = 0x20; *(uint64_t*)0x20000270 = 0x7e0; *(uint64_t*)0x20000278 = 0x20010500; memcpy((void*)0x20010500, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x20000280 = 0x20; *(uint64_t*)0x20000288 = 0x9e0; *(uint64_t*)0x20000290 = 0x20010600; memcpy((void*)0x20010600, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x20000298 = 0x20; *(uint64_t*)0x200002a0 = 0xbe0; *(uint64_t*)0x200002a8 = 0x20010700; memcpy((void*)0x20010700, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x200002b0 = 0x20; *(uint64_t*)0x200002b8 = 0xde0; *(uint64_t*)0x200002c0 = 0x20010900; memcpy((void*)0x20010900, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x200002c8 = 0x20; *(uint64_t*)0x200002d0 = 0x11e0; *(uint64_t*)0x200002d8 = 0x20010a00; memcpy( (void*)0x20010a00, "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab" "\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11\xd0\xab\x19\x11" "\xd0\xab\x19\x11\xd0\xab\x19\x11", 512); *(uint64_t*)0x200002e0 = 0x200; *(uint64_t*)0x200002e8 = 0x1600; *(uint64_t*)0x200002f0 = 0x20011300; memcpy((void*)0x20011300, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x55\xaa", 32); *(uint64_t*)0x200002f8 = 0x20; *(uint64_t*)0x20000300 = 0x80; *(uint64_t*)0x20000308 = 0x20011800; memcpy((void*)0x20011800, "\xf8\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x04\x00\x00\x00\xff" "\xff\xff\xff\xff\xff\xff\xff", 24); *(uint64_t*)0x20000310 = 0x18; *(uint64_t*)0x20000318 = 0x10000; *(uint64_t*)0x20000320 = 0x20013100; memcpy((void*)0x20013100, "\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x81\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x02\x00\x00\x00\x02", 57); *(uint64_t*)0x20000328 = 0x39; *(uint64_t*)0x20000330 = 0x14000; *(uint8_t*)0x20013b00 = 0; inject_fault(98); syz_mount_image(0x20000000, 0x20000100, 0xa400, 0xd, 0x20000200, 0, 0x20013b00); } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); setup_fault(); use_temporary_dir(); loop(); return 0; }