// https://syzkaller.appspot.com/bug?id=5aa94f1e557739f58b236ca7c62e6e11af314694 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1) #define BITMASK_LEN_OFF(type, bf_off, bf_len) \ (type)(BITMASK_LEN(type, (bf_len)) << (bf_off)) #define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \ if ((bf_off) == 0 && (bf_len) == 0) { \ *(type*)(addr) = (type)(val); \ } else { \ type new_val = *(type*)(addr); \ new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \ new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \ *(type*)(addr) = new_val; \ } static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t 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 execute_one(); extern unsigned long long procid; void loop() { while (1) { execute_one(); } } struct thread_t { int created, running, call; pthread_t th; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static int collide; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } static void execute(int num_calls) { int call, thread; running = 0; for (call = 0; call < num_calls; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); pthread_create(&th->th, &attr, thr, th); } if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); if (collide && call % 2) break; struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); if (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0}; void execute_call(int call) { long res; switch (call) { case 0: *(uint32_t*)0x20271000 = 2; *(uint32_t*)0x20271004 = 0x70; *(uint8_t*)0x20271008 = 0x49; *(uint8_t*)0x20271009 = 2; *(uint8_t*)0x2027100a = 0; *(uint8_t*)0x2027100b = 0; *(uint32_t*)0x2027100c = 0; *(uint64_t*)0x20271010 = 0; *(uint64_t*)0x20271018 = 0; *(uint64_t*)0x20271020 = 0; STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 0, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 1, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 2, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 3, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 4, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 5, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 6, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 7, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 8, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 9, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 10, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 11, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 12, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 13, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 14, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 15, 2); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 17, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 18, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 19, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 20, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 21, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 22, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 23, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 24, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 25, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 26, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 27, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 28, 1); STORE_BY_BITMASK(uint64_t, 0x20271028, 0, 29, 35); *(uint32_t*)0x20271030 = 0; *(uint32_t*)0x20271034 = 0; *(uint64_t*)0x20271038 = 0; *(uint64_t*)0x20271040 = 0; *(uint64_t*)0x20271048 = 0; *(uint64_t*)0x20271050 = 0; *(uint32_t*)0x20271058 = 0; *(uint32_t*)0x2027105c = 0; *(uint64_t*)0x20271060 = 0; *(uint32_t*)0x20271068 = 0; *(uint16_t*)0x2027106c = 0; *(uint16_t*)0x2027106e = 0; syscall(__NR_perf_event_open, 0x20271000, 0, 0, -1, 0); break; case 1: memcpy((void*)0x20000000, "/dev/loop#", 11); res = syz_open_dev(0x20000000, 0, 0); if (res != -1) r[0] = res; break; case 2: memcpy((void*)0x200000c0, "\x74\x08\x6e\x75\x00\x00\x00\x00\x00\x00\x00\x00\x00\x8c\x00", 15); res = syscall(__NR_memfd_create, 0x200000c0, 0); if (res != -1) r[1] = res; break; case 3: syscall(__NR_fstatfs, r[1], 0x20001380); break; case 4: memcpy((void*)0x20000000, "./file0", 8); syscall(__NR_mkdir, 0x20000000, 0xfffffffffffffffe); break; case 5: *(uint32_t*)0x20000140 = 4; syscall(__NR_getsockopt, r[1], 0x84, 7, 0x20000100, 0x20000140); break; case 6: *(uint32_t*)0x20000080 = 0x80; res = syscall(__NR_getsockopt, r[1], 0x29, 0, 0x20000040, 0x20000080); if (res != -1) r[2] = *(uint32_t*)0x20000050; break; case 7: *(uint16_t*)0x20001300 = 0x11; *(uint16_t*)0x20001302 = htobe16(0x19); *(uint32_t*)0x20001304 = r[2]; *(uint16_t*)0x20001308 = 1; *(uint8_t*)0x2000130a = 2; *(uint8_t*)0x2000130b = 6; *(uint8_t*)0x2000130c = 0; *(uint8_t*)0x2000130d = 0; *(uint8_t*)0x2000130e = 0; *(uint8_t*)0x2000130f = 0; *(uint8_t*)0x20001310 = 0; *(uint8_t*)0x20001311 = 0; *(uint8_t*)0x20001312 = 0; *(uint8_t*)0x20001313 = 0; syscall(__NR_connect, r[1], 0x20001300, 0xffffff52); break; case 8: *(uint32_t*)0x201b4ff8 = 0x19980330; *(uint32_t*)0x201b4ffc = 0; *(uint32_t*)0x2077ffe8 = 0; *(uint32_t*)0x2077ffec = 0; *(uint32_t*)0x2077fff0 = 0; *(uint32_t*)0x2077fff4 = 0; *(uint32_t*)0x2077fff8 = 0; *(uint32_t*)0x2077fffc = 0; syscall(__NR_capset, 0x201b4ff8, 0x2077ffe8); break; case 9: *(uint32_t*)0x20001340 = 7; syscall(__NR_setsockopt, r[1], 0x84, 0x12, 0x20001340, 4); break; case 10: memcpy((void*)0x2009a000, "./file0", 8); syscall(__NR_chroot, 0x2009a000); break; case 11: syscall(__NR_ioctl, r[0], 0x4c01); break; case 12: syscall(__NR_getdents64, r[1], 0x20000180, 0x1000); break; case 13: syscall(__NR_ioctl, r[0], 0x4c00, r[1]); break; case 14: syscall(__NR_fchmod, r[0], 0); break; case 15: syscall(__NR_ftruncate, r[1], 0x401); break; case 16: syscall(__NR_ioctl, r[0], 0x4c06, r[0]); break; } } void execute_one() { execute(17); collide = 1; execute(17); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (;;) { loop(); } }