// https://syzkaller.appspot.com/bug?id=a55dba81b9b7174e5f6bec1fac43b9887609ff01 // 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 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; } #define MAX_FDS 30 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 void setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); setsid(); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = (200 << 20); setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 32 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 0; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } typedef struct { const char* name; const char* value; } sysctl_t; static const sysctl_t sysctls[] = { {"/proc/sys/kernel/shmmax", "16777216"}, {"/proc/sys/kernel/shmall", "536870912"}, {"/proc/sys/kernel/shmmni", "1024"}, {"/proc/sys/kernel/msgmax", "8192"}, {"/proc/sys/kernel/msgmni", "1024"}, {"/proc/sys/kernel/msgmnb", "1024"}, {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, }; unsigned i; for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) write_file(sysctls[i].name, sysctls[i].value); } static int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static void drop_caps(void) { struct __user_cap_header_struct cap_hdr = {}; struct __user_cap_data_struct cap_data[2] = {}; cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; cap_hdr.pid = getpid(); if (syscall(SYS_capget, &cap_hdr, &cap_data)) exit(1); const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); cap_data[0].effective &= ~drop; cap_data[0].permitted &= ~drop; cap_data[0].inheritable &= ~drop; if (syscall(SYS_capset, &cap_hdr, &cap_data)) exit(1); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); setup_common(); sandbox_common(); drop_caps(); if (unshare(CLONE_NEWNET)) { } loop(); exit(1); } 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 setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void close_fds() { int fd; for (fd = 3; fd < MAX_FDS; fd++) close(fd); } 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 < 7; 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); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); close_fds(); 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++) { 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; } } } uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res; switch (call) { case 0: res = syz_open_dev(0xc, 4, 1); if (res != -1) r[0] = res; break; case 1: *(uint16_t*)0x20000000 = 0; *(uint16_t*)0x20000002 = 0; *(uint16_t*)0x20000004 = 0; *(uint16_t*)0x20000006 = 0; *(uint16_t*)0x20000008 = 4; *(uint16_t*)0x2000000a = 4; syscall(__NR_ioctl, r[0], 0x560a, 0x20000000ul); break; case 2: memcpy((void*)0x20000180, "/dev/fb0\000", 9); res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20000180ul, 0ul, 0ul); if (res != -1) r[1] = res; break; case 3: *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000008 = 0x18b; *(uint32_t*)0x2000000c = 0x360; *(uint32_t*)0x20000010 = 0; *(uint32_t*)0x20000014 = 0; *(uint32_t*)0x20000018 = 4; *(uint32_t*)0x2000001c = 0; *(uint32_t*)0x20000020 = 0; *(uint32_t*)0x20000024 = 0; *(uint32_t*)0x20000028 = 0; *(uint32_t*)0x2000002c = 0; *(uint32_t*)0x20000030 = 0; *(uint32_t*)0x20000034 = 0; *(uint32_t*)0x20000038 = 0; *(uint32_t*)0x2000003c = 0; *(uint32_t*)0x20000040 = 0; *(uint32_t*)0x20000044 = 0; *(uint32_t*)0x20000048 = 0; *(uint32_t*)0x2000004c = 0; *(uint32_t*)0x20000050 = 5; *(uint32_t*)0x20000054 = 0; *(uint32_t*)0x20000058 = 0; *(uint32_t*)0x2000005c = 0; *(uint32_t*)0x20000060 = 0; *(uint32_t*)0x20000064 = 0; *(uint32_t*)0x20000068 = 0; *(uint32_t*)0x2000006c = 0; *(uint32_t*)0x20000070 = 0; *(uint32_t*)0x20000074 = 0; *(uint32_t*)0x20000078 = 0; *(uint32_t*)0x2000007c = 0; *(uint32_t*)0x20000080 = 0; *(uint32_t*)0x20000084 = 0; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; *(uint32_t*)0x20000090 = 0; *(uint32_t*)0x20000094 = 0; *(uint32_t*)0x20000098 = 0; *(uint32_t*)0x2000009c = 0; syscall(__NR_ioctl, r[1], 0x4601, 0x20000000ul); break; case 4: res = syz_open_dev(0xc, 4, 1); if (res != -1) r[2] = res; break; case 5: res = syscall(__NR_dup, r[2]); if (res != -1) r[3] = res; break; case 6: *(uint32_t*)0x20000000 = 8; 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"\xd9\xda\x36\xf3\x43\x39\x6d\x48\x79\x3e\xd1\x89\xff\x09\x6b\x48\xd7" "\x66\xd4\x84\xe5\xca\x5a\xd8\xa7\x67\xc4\x8c\xe1\xeb\x64\x28\x63\x38" "\x21\x3c\x30\xde\xe1\x27\x31\xf4\x47\x07\x42\x7f\x1b\xe3\xbb\x1b\x92" "\xaf\x3a\x48\xca\xdb\x03\x57\xda\x62\x52\x97\x0c\xa5\x50\x41\x84\xed" "\x53\xbf\x11\x43\x31\xc2\x53\x4d\xf9\xf8\xb6\xd0\xb5\xd7\x0d\xde\x1a" "\x52\xff\x77\xa9\x76\x03\x72\x25\x1e\xd2\x0e\x57\xe7\xaa\xc3\x67\x1d" "\xaa\xa7\x2b\x42\xfc\x2c\x6a\x5d\x9c\x3a\x2b\xa3\x12\x4d\x45\xea\xf6" "\x11\xd9\x8b\x6c\x2a\x06\xc6\xb2\x4e\x91\xa5\x1c\x4d\x2d\xf3\xc9\x94" "\xba\x8f\xd8\xf6\xae\xe1\x6d\x73\x7d\x17\xc0\x4d\xc6\x96\x09\x2d\xf2" "\xa7\x47\x19\x85\x42\x22\xc7\xe6\xeb\xe4\x9b\x9a\xc2\x69\x94\x73\x12" "\x11\x0c\xed\x11\x2b\xbf\x87\x3d\x33\x5b\xf2\x5e\x6f\x66\x10\x5e\xf4" "\xf0\xf4\x0c\x35\xc1\x21\xec\x74\x5b\xa9\x3b\x9d\xad\xc4\x89\xa7\xfd" "\xa0\xeb\x59\xd6\x2c\xdc\x71\x8c\xbb\xb1\xf4\x2f\x6e\xde\x50\xbd\x24" "\x55\xa2\x83\x78\x8d\xbd\x64\xda\x39\x10\x75\xd2\x41\xb1\x03\x99\xb2" 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"\xb8\xc0\x79\x6a\x77\x48\x1e\x83\x06\x7c\x26\xe0\x45\xc5\xc8\xbc\x03" "\xb9\x55\xe7\xb6\x71\x8a\x7e\xed\x8f\xa7\x65\xc0\xf0\xad\xd8\x5c\xfd" "\xb1\x6e\x13\x6f\xd5\xc0\x46\x14\x94\x6e\x53\x4e\x4d\x3a\x0f\xdc\xe8" "\xd6\x53\x1e\x14\xee\xab\xb7\x05\xca\x76\x8c\xa8\x9c\x01\xc5\x70\x21" "\x61\x4d\x06\x1f\xda\x48\xb8\xbd\x05\xcd\xd4\x3c\x3d\xc8\xa8\x4d\x1d" "\x1a\xd4\xdb\x18\x0b\x07\x02\x74\x70\xbd\x6d\x22\x76\x77\x4d\xad\xed" "\xf9\xa7\xc7\x43\x06\x64\x6a\xab\xa3\xeb\xfc\x26\x91\x1a\x75\x6c\x56" "\xb5\x9f\x7f\x01\x87\x41\x83\x0f\xad\xe7\x72\xeb\x2d\x3f\x71\x5d\x95" "\x91\x1d\x24\xb0\x7d\xbf\xf0\x06\xe8\x68\x9b\x27\xeb\xd0\xf6\xbb\x02" "\x96\xcb\xee\xc4\x95\xd5\x97\xa0\xc0\x09\x26\x18\xbb\xd1\x23\x6a\xe1" "\xdc\xbc\x69\x31\x63\x25\xe2\xc1\x4b\x03\x31\x8a\x88\x6a\xc5\xdf\xfe" "\x4a\x70\x16\x64\x8f\x82\x32\xd4\xf6\xb3\x64\x5d\x28\xdc\xe4\x0e\x7c" "\x9e\xcf\xa0\xc0\xea\x54\x70\xdf\xeb\x2e\xaf\xa2\x2c\x50\xaa\x2b\xb2" "\x9e\x6b\x1d\x3e\x4a\x9d\xc0\xe5\x6e\xca\x48\xaa\x85\x9f\xcb\xce\x56" "\x44\xd8\x0c\x67\x99\x33\xe1\x9d\x70\xe2\x3b\xc0\x5e\xbd\x0f\x59\x3a" "\x62\x7f\xa8\x72\x8b\x4c\x8e\x05\x16\x52\x96\xff\x33\xe9\xa1\x2e\x02" "\x7f\xc0\x06\x4e\x86\x33\x8f\xe0\x69\x7e\xe2\xb9\x99\x0e\xe7\xab\x0d" "\x4e\xbc\x8f\x8b\xd0\x27\xda\x65\x2b\xaa\xf1\xcb\x59\xce\x5a\xf7\x9e" "\x6f\xbc\x1b\xf1\xb3\x09\x1e\x3d\x7c\xe3\xea\x94\x31\x28\x36\x52\x65" "\xac\xba\xd0\xee\x55\x2e\x70\x44\x74\xaf\x67\xc6\x1c\xa3\x56\xec\x19" "\x97\xac\x61\x9f\xb9\x4b\x74\x64\xa3\x3f\xe0\x5c\x4b\x0c\xf9\x3d\xdd" "\xef\x34\x0c\xf7\x0c\xc2\x3e\x68\xeb\x3e\x17\x94\x32\x70\x3a\x8c\x88" "\x3e\x19\xfe\xc3\x10\x03\xf5\xf0\xc5\x36\xa7\x17\xbd\xb8\x14\x92\x06" "\x70\x53\xdd\xaf\x00\xb0\x69\x47\x83\x6d\x30\xe4\x07\xbf\x4f\x56\x5b" "\x0a\xaa\xbd\x21\x4a\xe8\x3f\xcc\xe3\x37\x48\x9d\x6d\x4d\xdf\xee\x48" "\xd2\xc4\x42\xbe\x7d\xcf\x9b\xde\x4b\x70\xc9\x4d\x31\xd1\x99\xfc\x10" "\x1b\x44\x6f\x82\x54\xe7\xf5\x3c\x57\xdc\xbe\x5a\xb3\x9a\x5c\xbc\xc9" "\x6c\x08\xa2\xfb\x59\x47\x6d\x61\x56\xed\xf1\x30\xa1\x5a\x19\xb5\x0a" "\xbd\xc0\xfb\xbf\xbd\x5e\x44\x8d\x7c\x89\xd0\x49\x00\x2f\xbc\x86\x3d" "\xf6\x58\xd2\x5d\x6e\x58\x99\x04\xd7\x44\x59\x57\x34\xa0\xe2\x11\xb5" "\x55\xae\x03\xf2\x54\x8f\x57\x92\xce\x78\x69\xe3\xd1\x23\x96\xb0\x17" "\xad\x2c\x33\xb2\xec\xa7\x44\x2a\x8f\x3b\x9f\x6c\x98\xa1\xe0\x4c\x97" "\x7e\xb1\xa5\x52\xe5\x72\x58\x2e\x7b\xd2\x87\x6b\xc7\x73\x55\xb9\x18" "\x76\x3a\x80\x08\x99\xf4\x26\x41\x8e\x24\x04\x5f\x4c\xdb\xf1\x39\xc3" "\x9b\xf1\xb1\x61\x08\x34\x7a\x74\xbe\x0c\x5d\xe7\x8c\xba\x91\x83\x89" "\x19\xb2\x34\x50\x34\xbd\xb3\x04\xb9\x4a\x2a\xd1\x7e\xdd\x1d\xc0\x64" "\x62\xb5\x30\x67\x1c\xdf\x2c\xba\x29\x6b\xfb\xe4\x15\xa1\xf3\xaf\xae" "\x68\x6d\x22\x9b\x9f\x71\x83\x2e\x16\xc4\x9a\x14\x45\xa0\x84\xaa\x61" "\x49\x84\x2e\x92\x31\x64\x52\x43\x2b\xd5\x13\x8f\xed\x11\xd6\x28\x80" "\xb2\x28\x58\xa8\x25\x8d\x58\x05\x48\x48\xdd\x51\x46\x55\xc6\x6f\x31" "\xa4\xc3\x67\xc3\xef\x1e\x25\x7c\x94\x8c\x85\x66\xb7\x42\x29\xf8\xf9" "\x50\xd5\x38\xb2\x7b\xeb\xf2\x11\x55\x98\x1e\xb6\x47\xd8\x98\xdd\x02" "\x75\x85\xf0\x12\x6e\x51\x0d\x86\x57\xcd\x49\x15\x10\x53\x1a\x5d\x44" "\x0b\xf0\x18\x4f\xe2\xcb\x33\x9b\xa0\xc7\x4b\x86\xc1\xbe\x7e\xc9\x32" "\xc9\xad\xc7\xe3\x28\x58\x85\x2f\x5d\x73\x44\xd2\xdf\xcc\x1d\x81\x1c" "\x13\x8d\xf9\x92\x67\x94\x71\x54\xd5\xfa\xae\x3a\x33\xf1\x09\x14\x74" "\xda\x38\x6f\x4e\xf5\x85\x19\xe0\xfd\x94\x58\x68\x2d\x42\x39\xfa\x40" "\x9a\xe0\x00\x29\x65\x51\x04\x6d\x06\x73\x4a\x1b\x0b\x68\x42\xa1\x36" "\xeb\xee\x90\x90\x81\x94\x15\x85\x7f\x26\xfe\x39\x09\x33\x91\x93\x04" "\xb5\x36\x1f\xee\xd2\xe2\x9f\xac\xe0\x59\xf3\x5b\xa3\x25\xe8\x59\xd2" "\xf6\x7c\x8f\x22\x43\x43\xf4\xd9\x32\xcd\x66\x98\x4a\x0b\x62\x04\x0e" "\xd5\xa7\xb8\x4b\xa2\xcb\xbd\xe6\xed\x5a\x78\x2d\x50\x3f\xe3\x6c\x47" "\x97\xf2\x96\x99\xe6\xfe\x99\xc6\xc9\x11\x17\x09\x32\xd2\x30\x7f\x80" "\xd5\x43\xd2\x4d\x46\x90\x3d\xdd\xfd\x70\xbc\x39\x84\x01\xbc\x75\x5d" "\x6b\x68\xc1\xab\x75\x1b\xf8\x84\x6c\x61\x27\x79\x3c\xa7\xe1\xc5\x7d" "\xaf\x22\x6d\xcd\x57\x8d\x53\x74\xa8\x9e\x35\xf7\xe9\xf3\xb6\x65\x28" "\x7d\x18\x27\x0b\x02\xcf\x7a\x70\x89\x8d\xc9\x63\x55\xeb\x4e\x20\x04" "\xbc\x8e\x3e\x24\xf0\x92\x7f\x24\x82\x90\x24\xa7\xf4\x61\xd6\x5c\xed" "\x06\x6b\x75\xb6\x49\x15\x68\xcb\x3f\x6b\x5f\x50\x86\x63\x31\xc9\x5e" "\xf4\x74\x37\x9b\xbd\x13\xb0\x3b\x5a\xf0\x1e\xa7\x90\x6c\x7c\xa0", 4096); *(uint16_t*)0x20001004 = 0x1000; syscall(__NR_write, r[3], 0x20000000ul, 0x1006ul); 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); do_sandbox_none(); return 0; }