| // KMSAN: uninit-value in __skb_try_recv_from_queue |
| // https://syzkaller.appspot.com/bug?id=9843a5813422c77d088288d7b88cb724bf8d3170 |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <endian.h> |
| #include <linux/futex.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| #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; |
| } |
| |
| 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 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); |
| 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; |
| } |
| } |
| } |
| } |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| memcpy((void*)0x20001280, "\xff\x39\x97\xff\xcd\x00", 6); |
| *(uint8_t*)0x20001286 = 0xaa; |
| *(uint8_t*)0x20001287 = 0xaa; |
| *(uint8_t*)0x20001288 = 0xaa; |
| *(uint8_t*)0x20001289 = 0xaa; |
| *(uint8_t*)0x2000128a = 0xaa; |
| *(uint8_t*)0x2000128b = 0; |
| *(uint16_t*)0x2000128c = htobe16(0x800); |
| STORE_BY_BITMASK(uint8_t, 0x2000128e, 5, 0, 4); |
| STORE_BY_BITMASK(uint8_t, 0x2000128e, 4, 4, 4); |
| STORE_BY_BITMASK(uint8_t, 0x2000128f, 0, 0, 2); |
| STORE_BY_BITMASK(uint8_t, 0x2000128f, 0, 2, 6); |
| *(uint16_t*)0x20001290 = htobe16(0x24); |
| *(uint16_t*)0x20001292 = htobe16(0); |
| *(uint16_t*)0x20001294 = htobe16(0); |
| *(uint8_t*)0x20001296 = 0; |
| *(uint8_t*)0x20001297 = 0x88; |
| *(uint16_t*)0x20001298 = 0; |
| *(uint32_t*)0x2000129a = htobe32(0); |
| *(uint32_t*)0x2000129e = htobe32(-1); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 0, 0, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 0, 1, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 1, 2, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 0, 3, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 0, 4, 4); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 0, 8, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 0, 9, 4); |
| STORE_BY_BITMASK(uint16_t, 0x200012a2, 1, 13, 3); |
| *(uint16_t*)0x200012a4 = htobe16(0x880b); |
| *(uint16_t*)0x200012a6 = htobe16(0); |
| *(uint16_t*)0x200012a8 = htobe16(0); |
| STORE_BY_BITMASK(uint16_t, 0x200012aa, 0, 0, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012aa, 0, 1, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012aa, 0, 2, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012aa, 0, 3, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012aa, 0, 4, 9); |
| STORE_BY_BITMASK(uint16_t, 0x200012aa, 0, 13, 3); |
| *(uint16_t*)0x200012ac = htobe16(0x800); |
| STORE_BY_BITMASK(uint16_t, 0x200012ae, 0, 0, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012ae, 0, 1, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012ae, 0, 2, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012ae, 0, 3, 1); |
| STORE_BY_BITMASK(uint16_t, 0x200012ae, 0, 4, 9); |
| STORE_BY_BITMASK(uint16_t, 0x200012ae, 0, 13, 3); |
| *(uint16_t*)0x200012b0 = htobe16(0x86dd); |
| *(uint16_t*)0x200012b2 = 0; |
| *(uint16_t*)0x200012b4 = htobe16(0); |
| *(uint32_t*)0x200012b6 = htobe32(0); |
| STORE_BY_BITMASK(uint8_t, 0x200012ba, 0, 0, 4); |
| STORE_BY_BITMASK(uint8_t, 0x200012ba, 0, 4, 4); |
| *(uint8_t*)0x200012bb = 0; |
| STORE_BY_BITMASK(uint8_t, 0x200012bc, 0, 0, 2); |
| STORE_BY_BITMASK(uint8_t, 0x200012bc, 0, 2, 1); |
| STORE_BY_BITMASK(uint8_t, 0x200012bc, 0, 3, 2); |
| STORE_BY_BITMASK(uint8_t, 0x200012bc, 0, 5, 3); |
| *(uint8_t*)0x200012bd = 0; |
| *(uint32_t*)0x200012be = 0; |
| *(uint32_t*)0x200012c2 = htobe32(0); |
| *(uint16_t*)0x200012c6 = 0; |
| *(uint16_t*)0x200012c8 = htobe16(0); |
| *(uint32_t*)0x200012ca = htobe32(0); |
| STORE_BY_BITMASK(uint8_t, 0x200012ce, 0, 0, 4); |
| STORE_BY_BITMASK(uint8_t, 0x200012ce, 0, 4, 4); |
| *(uint8_t*)0x200012cf = 0; |
| STORE_BY_BITMASK(uint8_t, 0x200012d0, 0, 0, 2); |
| STORE_BY_BITMASK(uint8_t, 0x200012d0, 0, 2, 1); |
| STORE_BY_BITMASK(uint8_t, 0x200012d0, 0, 3, 2); |
| STORE_BY_BITMASK(uint8_t, 0x200012d0, 0, 5, 3); |
| *(uint8_t*)0x200012d1 = 0; |
| *(uint32_t*)0x200012d2 = 0; |
| *(uint32_t*)0x200012d6 = htobe32(0); |
| *(uint16_t*)0x200012da = htobe16(0); |
| STORE_BY_BITMASK(uint8_t, 0x200012dc, 0, 0, 2); |
| STORE_BY_BITMASK(uint8_t, 0x200012dc, 0, 2, 5); |
| STORE_BY_BITMASK(uint8_t, 0x200012dc, 0, 7, 1); |
| STORE_BY_BITMASK(uint8_t, 0x200012dd, 0, 0, 1); |
| STORE_BY_BITMASK(uint8_t, 0x200012dd, 0, 1, 2); |
| STORE_BY_BITMASK(uint8_t, 0x200012dd, 0, 3, 1); |
| STORE_BY_BITMASK(uint8_t, 0x200012dd, 0, 4, 1); |
| *(uint16_t*)0x200012de = 0; |
| *(uint16_t*)0x200012e0 = htobe16(0); |
| *(uint32_t*)0x200012e2 = htobe32(0); |
| struct csum_inet csum_1; |
| csum_inet_init(&csum_1); |
| csum_inet_update(&csum_1, (const uint8_t*)0x2000128e, 20); |
| *(uint16_t*)0x20001298 = csum_inet_digest(&csum_1); |
| break; |
| case 1: |
| res = syscall(__NR_socket, 0xa, 3, 0x2b); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 2: |
| *(uint16_t*)0x20017000 = 0xa; |
| *(uint16_t*)0x20017002 = htobe16(0x4e20); |
| *(uint32_t*)0x20017004 = 0; |
| *(uint8_t*)0x20017008 = 0; |
| *(uint8_t*)0x20017009 = 0; |
| *(uint8_t*)0x2001700a = 0; |
| *(uint8_t*)0x2001700b = 0; |
| *(uint8_t*)0x2001700c = 0; |
| *(uint8_t*)0x2001700d = 0; |
| *(uint8_t*)0x2001700e = 0; |
| *(uint8_t*)0x2001700f = 0; |
| *(uint8_t*)0x20017010 = 0; |
| *(uint8_t*)0x20017011 = 0; |
| *(uint8_t*)0x20017012 = 0; |
| *(uint8_t*)0x20017013 = 0; |
| *(uint8_t*)0x20017014 = 0; |
| *(uint8_t*)0x20017015 = 0; |
| *(uint8_t*)0x20017016 = 0; |
| *(uint8_t*)0x20017017 = 0; |
| *(uint32_t*)0x20017018 = 0; |
| syscall(__NR_connect, r[0], 0x20017000, 0x1c); |
| break; |
| case 3: |
| *(uint64_t*)0x20001000 = 0x20000840; |
| *(uint32_t*)0x20001008 = 0x10; |
| *(uint64_t*)0x20001010 = 0x20000a00; |
| *(uint64_t*)0x20001018 = 0; |
| *(uint64_t*)0x20001020 = 0x20000f40; |
| *(uint64_t*)0x20001028 = 0xac; |
| *(uint32_t*)0x20001030 = 0; |
| *(uint32_t*)0x20001038 = 0; |
| *(uint64_t*)0x20000a40 = 0; |
| *(uint64_t*)0x20000a48 = 0x989680; |
| syscall(__NR_recvmmsg, r[0], 0x20001000, 1, 0x10022, 0x20000a40); |
| break; |
| case 4: |
| *(uint64_t*)0x20000580 = 0; |
| *(uint32_t*)0x20000588 = 0; |
| *(uint64_t*)0x20000590 = 0x20000200; |
| *(uint64_t*)0x20000598 = 0; |
| *(uint64_t*)0x200005a0 = 0x20000780; |
| *(uint64_t*)0x200005a8 = 0; |
| *(uint32_t*)0x200005b0 = 0; |
| syscall(__NR_sendmsg, r[0], 0x20000580, 0); |
| break; |
| } |
| } |
| |
| void loop() |
| { |
| execute(5); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| loop(); |
| return 0; |
| } |
