// https://syzkaller.appspot.com/bug?id=e98697201e604df4f4214fa9f7691b1249801550 // 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 #include #include static unsigned long long procid; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ { \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ } 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 thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); int i; for (i = 0; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } typedef struct { int state; } event_t; static void event_init(event_t* ev) { ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { if (ev->state) exit(1); __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); } static int event_isset(event_t* ev) { return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; for (;;) { uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } 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) #define sys_memfd_create 319 static unsigned long fs_image_segment_check(unsigned long size, unsigned long nsegs, long segments) { unsigned long i; struct fs_image_segment* segs = (struct fs_image_segment*)segments; if (nsegs > IMAGE_MAX_SEGMENTS) nsegs = IMAGE_MAX_SEGMENTS; for (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 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) { char loopname[64], fs[32], opts[256]; int loopfd, err = 0, res = -1; unsigned long i; NONFAILING(size = fs_image_segment_check(size, nsegs, segments)); int memfd = syscall(sys_memfd_create, "syz_mount_image", 0); if (memfd == -1) { err = errno; goto error; } if (ftruncate(memfd, size)) { err = errno; goto error_close_memfd; } for (i = 0; i < nsegs; i++) { struct fs_image_segment* segs = (struct fs_image_segment*)segments; int res1 = 0; NONFAILING(res1 = pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset)); if (res1 < 0) { } } snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); 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; } } mkdir((char*)dir, 0777); memset(fs, 0, sizeof(fs)); NONFAILING(strncpy(fs, (char*)fsarg, sizeof(fs) - 1)); memset(opts, 0, sizeof(opts)); NONFAILING(strncpy(opts, (char*)optsarg, 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"); } if (mount(loopname, (char*)dir, fs, flags, opts)) { err = errno; goto error_clear_loop; } res = 0; error_clear_loop: ioctl(loopfd, LOOP_CLR_FD, 0); error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return res; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (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"); } struct thread_t { int created, call; event_t ready, done; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void execute_one(void) { int i, call, thread; int collide = 0; again: for (call = 0; call < 3; call++) { for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); if (collide && (call % 2) == 0) break; event_timedwait(&th->done, 45 + (call == 1 ? 50 : 0)); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); if (!collide) { collide = 1; goto again; } } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter; for (iter = 0;; iter++) { reset_loop(); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { 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 < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } void execute_call(int call) { switch (call) { case 0: NONFAILING(memcpy((void*)0x20000200, "./file0\000", 8)); syscall(__NR_open, 0x20000200ul, 0x1070c0ul, 0ul); break; case 1: NONFAILING(memcpy((void*)0x20000140, "minix\000", 6)); NONFAILING(memcpy((void*)0x20000080, "./file0\000", 8)); NONFAILING(*(uint64_t*)0x20000000 = 0x20000040); NONFAILING(memcpy((void*)0x20000040, "\x60\x00\x84\xe0\x02\x00\x0a\x00\x00" "\x00\x00\x01\x00\x00\x00\xc9\x8f\x13", 18)); NONFAILING(*(uint64_t*)0x20000008 = 0x12); NONFAILING(*(uint64_t*)0x20000010 = 0x400); NONFAILING(*(uint64_t*)0x20000018 = 0x20000880); NONFAILING(memcpy( (void*)0x20000880, "\xee\x9f\x84\xa4\x3e\xcc\xaf\x13\x15\xbb\x39\x7d\x00\xc1\xb6\xdd\x82" "\x0d\xd1\x39\x16\x18\x1d\xba\x62\x09\x38\xcb\x30\xf1\xc2\x1a\xfe\x3d" "\x92\x62\x98\xb2\x58\x34\xe8\x90\x09\x2d\x64\x2c\xaf\xe5\xdb\x21\xba" "\x94\x94\xfc\xbc\xf6\x60\x79\xb7\x22\xe7\x3b\xe3\xa8\x70\x8a\x36\x24" "\x25\x0f\x9f\x59\xfb\xbe\x94\x29\x97\xc6\xc1\xe8\x3a\x34\xe5\x77\x9e" "\x8a\x4f\x40\xfd\xb6\xff\xe5\x9f\xfe\x49\x03\x50\x0d\x3c\xd8\xc8\xf3" "\xed\x19\xad\x17\x6d\xaf\x94\xcf\x7f\xca\xf2\x92\x2f\x8a\xab\x3b\xec" "\xc6\x0c\x8d\x39\xdd\xf4\x3c\xd6\xd2\xe9\x30\x1d\xa3\xca\xa3\x57\x19" "\xf2\x5a\x83\x47\x85\x59\xe0\xe8\x91\xdc\xb7\x56\xee\x22\x96\x4d\x03" "\xf3\x75\x61\xf5\x79\x74\x90\xa0\xb9\x35\x06\x48\x28\x22\x07\x5b\xa9" "\x6d\xb3\x5a\x44\x0d\x04\x6e\x44\xeb\x4a\x79\x98\x6b\x51\x82\x81\x60" "\x90\x03\xb6\xfa\xe0\x4a\x18\xbe\x9a\x83\xce\x7e\xfa\x2a\xb8\x0f\x75" "\xc9\x0d\x78\xf0\xb4\x17\x9d\x67\x43\x76\xdb\x1f\x7a\xe8\x74\x56\x41" "\xad\xcd\xe0\xd2\x45\x72\x27\x44\xbc\xea\x2f\xac\x94\x45\x01\x4e\xe2" "\x29\x39\x85\x11\x95\x73\xff\xcc\x0c\x22\xeb\x07\x69\xde\x1e\x9e\x5d" "\xb5\x3a\xa3\x37\x8a\x44\x26\x50\x30\x10\xa7\xc6\x24\x72\x65\x83\x82" "\x11\x52\x7a\x01\x32\xcc\xf8\x83\xee\x08\xa6\xea\x1a\x78\x5e\x47\xce" "\x16\x66\x3f\x1c\x74\x4a\xf4\x92\x00\xd5\xf3\xbc\x32\x6e\x7d\x90\x89" "\xa5\xf1\x7d\x0a\xd0\x5f\x06\xe4\x8c\x20\x5f\x9b\x6d\x08\x7b\xa7\xd3" "\xb6\x74\x5e\x65\x70\x0c\x00\x95\x72\xa6\x5b\x4b\xfb\xf6\x68\x78\x21" "\xbc\x72\x3b\x61\xb5\xab\xe7\x35\x7e\x68\xa9\xb0\x64\x0b\xfb\x9c\x01" "\x00\x00\x80\x00\x00\x00\x00\x0e\x84\x0e\xcf\x37\x9c\x57\x6c\x05\x75" "\x7d\x44\xb1\x9d\xe0\xe2\xaa\x36\x4c\x42\x15\x62\x19\xa7\x2c\xc9\x43" "\xa6\x0f\x04\x10\x89\x1e\xd1\x34\xf3\x5f\x5f\xe6\xb4\xcf\x3a\xbb\xcb" "\x98\x44\x36\x32\x23\x58\xa7\xc9\x39\x37\x24\x86\x0d\x87\x25\x39\x81" "\xf9\xe7\x9d\xbe\xb7\x89\x57\x7e\xad\x0e\xde\x31\xe1\x9a\x2b\x11\x4a" "\x0e\x4d\x82\xb3\xe1\x02\x3d\xd2\x8b\x63\x82\xe6\x7e\x32\x46\xd2\x91" "\x2e\x55\xcf\x99\x28\xda\x32\xc1\x02\x7c\xef\x7c\x6c\x61\x0e\xa8\xfc" "\xe1\x49\xa7\xaf\x20\x22\x4b\x4e\x02\x86\x01\x93\x6e\xf9\xa7\x8d\x80" "\xff\x55\x67\x08\x4e\xc1\x28\x76\x6e\x82\x2d\x61\x24\x18\x6d\x82\xe7" "\x60\x12\x8d\xd7\xde\x26\x53\x93\x9d\x35\x3c\x12\xf9\x6d\xef\xf3\xa2" "\x8b\x02\x2c\x78\x4b\xd3\x7d\xf7\xf7\x66\x40\xbc\xbc\xb0\x1a\x46\x76" "\xd5\x8b\x3e\x9c\x2b\xaa\xe6\x62\x30\xe5\xf5\x4a\x37\x52\x7e\x81\x29" "\xd1\x61\xb0\xc0\x6f\x25\x64\x8c\x55\xa7\xe5\xb2\xdb\x52\x80\x53\xc3" "\xe3\x86\x4f\x41\x72\x8b\x79\x35\xe5\x75\x56\x8a\xd1\x14\xeb\x8c\x81" "\x1b\xd8\x9e\x07\xa3\x98\xba\xbb\xc6\x4f\xbe\xab\x84\x26\x88\x55\x47" "\x83\xed\x15\x51\x94\x9a\x79\x1e\x33\x79\x9e\x59\xa3\x4b\x6b\xda\xbc" "\x34\x58\xc3\x79\xc7\x35\x19\x82\x92\xe5\xa2\x72\x18\x74\x49\x24\x9d" "\x2c\x8a\x9a\xa5\x8f\x38\x35\xa3\xe1\x71\x60\x83\xbb\x04\xe4\xcb\xe1" "\x40\xd1\x58\x7a\x21\xe4\xec\x2a\xe1\xf3\xad\x81\x13\x4d\xf5\x59\x03" "\xff\xb8\xe1\x73\x64\x63\x52\x91\x5a\x2c\x70\x67\x09\xcf\x46\x53\x89" "\x78\x22\x4c\x0d\x6d\xc4\x37\xcb\xfc\x37\xab\xfb\xd1\xb7\x6f\xeb\x5c" "\xa3\xae\xb1\xac\x8c\xbd\x40\xd5\xba\x89\x6f\x79\xee\x8f\x76\xb0\x80" "\x9f\x59\xb8\x68\x62\x64\x87\x74\xd2\xac\xe9\x8b\x82\x5e\x7a\x46\x5b" "\x5d\xd8\x0e\x49\x19\x65\x97\x1e\x77\x97\xab\xa3\x96\x84\x41\xc7\x77" "\x17\xa2\x4c\xa4\x1e\xfb\x16\x0c\x03\x0c\xfc\x8e\x73\x87\x25\x40\xef" "\x4e\x5a\xec\xb0\xde\x86\xdd\x2a\x75\xbe\xe6\x1a\x93\x03\xa3\x32\x23" "\x3f\xf5\xa2\x59\xb0\x78\xa6", 806)); NONFAILING(*(uint64_t*)0x20000020 = 0x326); NONFAILING(*(uint64_t*)0x20000028 = 0x34f9); syz_mount_image(0x20000140, 0x20000080, 0, 2, 0x20000000, 0, 0); break; case 2: NONFAILING(memcpy((void*)0x20000480, "./file0\000", 8)); syscall(__NR_acct, 0x20000480ul); break; } } 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); install_segv_handler(); loop(); return 0; }