// https://syzkaller.appspot.com/bug?id=238aa07eee3372acfc4c82f99c4960abd0d52d6a // 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 #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; int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0; int valid = addr < prog_start || addr > prog_end; if (skip && valid) { _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(...) \ ({ \ int ok = 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } else \ ok = 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) 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 = 0; for (; 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; } static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static long syz_open_procfs(volatile long a0, volatile long a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == -1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } 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, 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(sys_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; } 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"); } 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; for (call = 0; call < 11; 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); event_timedwait(&th->done, 50 + (call == 10 ? 50 : 0)); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; 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 < 5000) { continue; } kill_and_wait(pid, &status); break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: syscall(__NR_signalfd, -1, 0ul, 0ul); break; case 1: res = -1; NONFAILING(res = syz_open_procfs(0, 0)); if (res != -1) r[0] = res; break; case 2: syscall(__NR_preadv, r[0], 0ul, 0ul, 0, 0); break; case 3: res = -1; NONFAILING(res = syz_open_procfs(0, 0)); if (res != -1) r[1] = res; break; case 4: syscall(__NR_preadv, r[1], 0ul, 0ul, 0, 0); break; case 5: syscall(__NR_fcntl, r[1], 0x40eul, 0ul); break; case 6: syscall(__NR_creat, 0ul, 0xful); break; case 7: syscall(__NR_sendmsg, r[0], 0ul, 0x40ul); break; case 8: res = -1; NONFAILING(res = syz_open_dev(0, 2 + procid * 4, 2)); if (res != -1) r[2] = res; break; case 9: syscall(__NR_sendfile, r[2], r[0], 0ul, 9ul); break; case 10: NONFAILING(memcpy((void*)0x20000000, "f2fs\000", 5)); NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8)); NONFAILING(*(uint64_t*)0x20000200 = 0x20010000); NONFAILING( memcpy((void*)0x20010000, "\x10\x20\xf5\xf2\x01\x00\x0b\x00\x09\x00\x00\x00\x03\x00\x00" "\x00\x0c\x00\x00\x00\x09\x00\x00\x00\x01\x00\x00\x00\x01\x00" "\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x18" "\x00\x00\x00\x1f\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00" "\x02\x00\x00\x00\x01\x00\x00\x00\x18\x00\x00\x00\x00\x02\x00" "\x00\x00\x02\x00\x00\x00\x06\x00\x00\x00\x0a\x00\x00\x00\x0e" "\x00\x00\x00\x10\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x02", 105)); NONFAILING(*(uint64_t*)0x20000208 = 0x69); NONFAILING(*(uint64_t*)0x20000210 = 0x400); NONFAILING(*(uint64_t*)0x20000218 = 0x20010a00); NONFAILING(memcpy( (void*)0x20010a00, "\x19\x70\x17\x1e\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02" "\x00\x00\x00\x00\x00\x00\x00\x0d\x00\x00\x00\x10\x00\x00\x00\x12\x00" "\x00\x00\x17\x00\x00\x00\x16\x00\x00\x00\x15\x00\x00\x00\xff\xff\xff" "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" "\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14" "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff" "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x01\x00\x00" "\x06\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x04" "\x00\x00\x00\x40\x00\x00\x00\x40\x00\x00\x00\xfc\x0f", 166)); NONFAILING(*(uint64_t*)0x20000220 = 0xa6); NONFAILING(*(uint64_t*)0x20000228 = 0x200000); NONFAILING(*(uint64_t*)0x20000230 = 0x20010b00); NONFAILING( memcpy((void*)0x20010b00, "\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\x03\x01" "\x5d\x57\x01\x00\x03\x00\x00\x00\x00\x03\x00\x00\x00\x00\x3e", 45)); NONFAILING(*(uint64_t*)0x20000238 = 0x2d); NONFAILING(*(uint64_t*)0x20000240 = 0x200fe0); NONFAILING(*(uint64_t*)0x20000248 = 0x20010c00); NONFAILING(memcpy((void*)0x20010c00, "\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\x06" "\x00\x17\x00\x00\x00\x01\x0c\x80", 36)); NONFAILING(*(uint64_t*)0x20000250 = 0x24); NONFAILING(*(uint64_t*)0x20000258 = 0x2011e0); NONFAILING(*(uint64_t*)0x20000260 = 0x20011600); NONFAILING(memcpy( (void*)0x20011600, "\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\x19\x70" "\x17\x1e\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02\x00\x00" "\x00\x00\x00\x00\x00\x0d\x00\x00\x00\x10\x00\x00\x00\x12\x00\x00\x00" "\x17\x00\x00\x00\x16\x00\x00\x00\x15\x00\x00\x00\xff\xff\xff\xff\xff" "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14\x00\x00" "\x00\x01\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff" "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x01\x00\x00\x06\x00" "\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00" "\x00\x40\x00\x00\x00\x40\x00\x00\x00\xfc\x0f", 198)); NONFAILING(*(uint64_t*)0x20000268 = 0xc6); NONFAILING(*(uint64_t*)0x20000270 = 0x204fe0); NONFAILING(*(uint64_t*)0x20000278 = 0x20011700); NONFAILING(memcpy( (void*)0x20011700, "\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\x03\x01\x5d\x57", 32)); NONFAILING(*(uint64_t*)0x20000280 = 0x20); NONFAILING(*(uint64_t*)0x20000288 = 0x205fe0); NONFAILING(*(uint64_t*)0x20000290 = 0x20012100); NONFAILING(memcpy((void*)0x20012100, "\xed\x41\x00\x00\x5c\xf9\x01\x00\x53\x5f\x01\x00\x02\x00" "\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02", 25)); NONFAILING(*(uint64_t*)0x20000298 = 0x19); NONFAILING(*(uint64_t*)0x200002a0 = 0x3e00000); NONFAILING(*(uint64_t*)0x200002a8 = 0x20012300); NONFAILING(memcpy((void*)0x20012300, "\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x03", 13)); NONFAILING(*(uint64_t*)0x200002b0 = 0xd); NONFAILING(*(uint64_t*)0x200002b8 = 0x3e00fe0); NONFAILING(memcpy((void*)0x20000300, "jqfmt=vfsv1", 11)); NONFAILING(*(uint8_t*)0x2000030b = 0x2c); NONFAILING(memcpy((void*)0x2000030c, "grpjquota", 9)); NONFAILING(*(uint8_t*)0x20000315 = 0x3d); NONFAILING(memcpy( (void*)0x20000316, "\315\023\376W\363\313JN\n\230\200(\020\334Ah\a\'\376V|" "\034\203B84\253\025\216\020\240\360\023\225y\356\226\301\271\257\335Q" "\206\234@\202\000\000\362N\367\016\261\006=" "\313\376E\201\334\321\026\200\244?" "\363J\033\031\016\256g\206f\217\2221\177c\260\35627x\243\323Y\261\001<" "*\214\251\364\340\306W\260\3604`G\301\305Y\225\350\316\334ve{" "\335M\375\230\231\237\314\353\337u\315,>\225e\226&" "\376\035\275CGgNu\264\350\030\367\353\331\261\227}" "m\327\307m\212o\024ji\331\315\350\211\277\340\210\006m\227\336\260\235" "\363\337\347g\251s\261$", 176)); NONFAILING(*(uint8_t*)0x200003c6 = 0x2c); NONFAILING(*(uint8_t*)0x200003c7 = 0); NONFAILING(syz_mount_image(0x20000000, 0x20000100, 0, 8, 0x20000200, 0, 0x20000300)); 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(); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }