// https://syzkaller.appspot.com/bug?id=6c1b04a3fa68d252d38ef6aa79993865d4124a88 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #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; \ } struct csum_inet { uint32_t acc; }; static void csum_inet_init(struct csum_inet* csum) { csum->acc = 0; } static void csum_inet_update(struct csum_inet* csum, const uint8_t* data, size_t length) { if (length == 0) return; size_t i; for (i = 0; i < length - 1; i += 2) csum->acc += *(uint16_t*)&data[i]; if (length & 1) csum->acc += (uint16_t)data[length - 1]; while (csum->acc > 0xffff) csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16); } static uint16_t csum_inet_digest(struct csum_inet* csum) { return ~csum->acc; } 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)); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } long r[70]; void loop() { memset(r, -1, sizeof(r)); r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul); r[1] = syscall(__NR_socket, 0x2ul, 0x1ul, 0x0ul); memcpy((void*)0x2051fff3, "\x2f\x64\x65\x76\x2f\x6e\x65\x74\x2f\x74\x75\x6e\x00", 13); r[3] = syz_open_dev(0x2051fff3ul, 0x0ul, 0xaul); r[4] = syscall(__NR_fcntl, r[3], 0x0ul, r[3]); memcpy((void*)0x20a5afd8, "\x67\x72\x65\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00", 16); memcpy((void*)0x20a5afe8, "\x4f\x54\x00\x0c\xc0\xa1\xed\x4f\x3a\x0a\x1f\xdc\x22\x20\x73" "\xb5", 16); r[7] = syscall(__NR_ioctl, r[3], 0x400454caul, 0x20a5afd8ul); memcpy((void*)0x2062ffe0, "\x67\x72\x65\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00", 16); *(uint16_t*)0x2062fff0 = (uint16_t)0x301; r[10] = syscall(__NR_ioctl, r[1], 0x8914ul, 0x2062ffe0ul); *(uint32_t*)0x20e9bffc = (uint32_t)0xfffffffffffffffc; r[12] = syscall(__NR_ioctl, r[3], 0x400454d4ul, 0x20e9bffcul); *(uint8_t*)0x20101000 = (uint8_t)0x0; *(uint8_t*)0x20101001 = (uint8_t)0x0; *(uint16_t*)0x20101002 = (uint16_t)0x0; *(uint16_t*)0x20101004 = (uint16_t)0x0; *(uint16_t*)0x20101006 = (uint16_t)0x0; *(uint16_t*)0x20101008 = (uint16_t)0x0; STORE_BY_BITMASK(uint8_t, 0x2010100a, 0x0, 0, 4); STORE_BY_BITMASK(uint8_t, 0x2010100a, 0x6, 4, 4); memcpy((void*)0x2010100b, "\x85\xb7\xe3", 3); *(uint16_t*)0x2010100e = (uint16_t)0x1400; *(uint8_t*)0x20101010 = (uint8_t)0x6; *(uint8_t*)0x20101011 = (uint8_t)0x0; *(uint8_t*)0x20101012 = (uint8_t)0xfe; *(uint8_t*)0x20101013 = (uint8_t)0x80; *(uint8_t*)0x20101014 = (uint8_t)0x0; *(uint8_t*)0x20101015 = (uint8_t)0x0; *(uint8_t*)0x20101016 = (uint8_t)0x0; *(uint8_t*)0x20101017 = (uint8_t)0x0; *(uint8_t*)0x20101018 = (uint8_t)0x0; *(uint8_t*)0x20101019 = (uint8_t)0x0; *(uint8_t*)0x2010101a = (uint8_t)0x0; *(uint8_t*)0x2010101b = (uint8_t)0x0; *(uint8_t*)0x2010101c = (uint8_t)0x0; *(uint8_t*)0x2010101d = (uint8_t)0x0; *(uint8_t*)0x2010101e = (uint8_t)0x0; *(uint8_t*)0x2010101f = (uint8_t)0x0; *(uint8_t*)0x20101020 = (uint8_t)0x0; *(uint8_t*)0x20101021 = (uint8_t)0xbb; *(uint8_t*)0x20101022 = (uint8_t)0xfe; *(uint8_t*)0x20101023 = (uint8_t)0x80; *(uint8_t*)0x20101024 = (uint8_t)0x0; *(uint8_t*)0x20101025 = (uint8_t)0x0; *(uint8_t*)0x20101026 = (uint8_t)0x0; *(uint8_t*)0x20101027 = (uint8_t)0x0; *(uint8_t*)0x20101028 = (uint8_t)0x0; *(uint8_t*)0x20101029 = (uint8_t)0x0; *(uint8_t*)0x2010102a = (uint8_t)0x0; *(uint8_t*)0x2010102b = (uint8_t)0x0; *(uint8_t*)0x2010102c = (uint8_t)0x0; *(uint8_t*)0x2010102d = (uint8_t)0x0; *(uint8_t*)0x2010102e = (uint8_t)0x0; *(uint8_t*)0x2010102f = (uint8_t)0x0; *(uint8_t*)0x20101030 = (uint8_t)0x0; *(uint8_t*)0x20101031 = (uint8_t)0xbb; *(uint16_t*)0x20101032 = (uint16_t)0x204e; *(uint16_t*)0x20101034 = (uint16_t)0x204e; *(uint32_t*)0x20101036 = (uint32_t)0x42424242; *(uint32_t*)0x2010103a = (uint32_t)0x42424242; STORE_BY_BITMASK(uint8_t, 0x2010103e, 0x0, 0, 1); STORE_BY_BITMASK(uint8_t, 0x2010103e, 0x0, 1, 3); STORE_BY_BITMASK(uint8_t, 0x2010103e, 0x5, 4, 4); *(uint8_t*)0x2010103f = (uint8_t)0x0; *(uint16_t*)0x20101040 = (uint16_t)0x0; *(uint16_t*)0x20101042 = (uint16_t)0x0; *(uint16_t*)0x20101044 = (uint16_t)0x0; struct csum_inet csum_68; csum_inet_init(&csum_68); csum_inet_update(&csum_68, (const uint8_t*)0x20101012, 16); csum_inet_update(&csum_68, (const uint8_t*)0x20101022, 16); uint32_t csum_68_chunk_2 = 0x14000000; csum_inet_update(&csum_68, (const uint8_t*)&csum_68_chunk_2, 4); uint32_t csum_68_chunk_3 = 0x6000000; csum_inet_update(&csum_68, (const uint8_t*)&csum_68_chunk_3, 4); csum_inet_update(&csum_68, (const uint8_t*)0x20101032, 20); *(uint16_t*)0x20101042 = csum_inet_digest(&csum_68); r[69] = syscall(__NR_write, r[4], 0x20101000ul, 0x46ul); } int main() { loop(); return 0; }