| // INFO: trying to register non-static key in tun_do_read |
| // https://syzkaller.appspot.com/bug?id=e3e31b131a4f24fec5241c879e510405a4604b54 |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <endian.h> |
| #include <fcntl.h> |
| #include <linux/futex.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| 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); |
| } |
| } |
| |
| 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 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[2] = {0xffffffffffffffff, 0xffffffffffffffff}; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| memcpy((void*)0x20000040, "/dev/net/tun", 13); |
| res = syz_open_dev(0x20000040, 0, 0); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 1: |
| memcpy((void*)0x20000000, |
| "\x69\x66\x62\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", |
| 16); |
| *(uint16_t*)0x20000010 = 0x33cb; |
| syscall(__NR_ioctl, r[0], 0x400454ca, 0x20000000); |
| break; |
| case 2: |
| syscall(__NR_pread64, r[0], 0x20000080, 0x6e, 0); |
| break; |
| case 3: |
| res = syscall(__NR_socket, 0x10, 3, 0); |
| if (res != -1) |
| r[1] = res; |
| break; |
| case 4: |
| *(uint64_t*)0x200001c0 = 0x20000100; |
| *(uint16_t*)0x20000100 = 0x10; |
| *(uint16_t*)0x20000102 = 0; |
| *(uint32_t*)0x20000104 = 0; |
| *(uint32_t*)0x20000108 = 0; |
| *(uint32_t*)0x200001c8 = 0xc; |
| *(uint64_t*)0x200001d0 = 0x20000180; |
| *(uint64_t*)0x20000180 = 0x200003c0; |
| *(uint32_t*)0x200003c0 = 0x58; |
| *(uint16_t*)0x200003c4 = 0x11; |
| *(uint16_t*)0x200003c6 = 0x405; |
| *(uint32_t*)0x200003c8 = 0x70bd25; |
| *(uint32_t*)0x200003cc = 0x25dfdbfe; |
| *(uint8_t*)0x200003d0 = 0; |
| *(uint8_t*)0x200003d1 = 0; |
| *(uint16_t*)0x200003d2 = 0; |
| *(uint32_t*)0x200003d4 = 0; |
| *(uint32_t*)0x200003d8 = 0; |
| *(uint32_t*)0x200003dc = 0; |
| *(uint16_t*)0x200003e0 = 0x14; |
| *(uint16_t*)0x200003e2 = 3; |
| memcpy((void*)0x200003e4, |
| "\x69\x66\x62\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", |
| 16); |
| *(uint16_t*)0x200003f4 = 8; |
| *(uint16_t*)0x200003f6 = 0x1e; |
| *(uint32_t*)0x200003f8 = 1; |
| *(uint16_t*)0x200003fc = 8; |
| *(uint16_t*)0x200003fe = 0x16; |
| *(uint16_t*)0x20000400 = 4; |
| *(uint16_t*)0x20000402 = 1; |
| *(uint16_t*)0x20000404 = 0x14; |
| *(uint16_t*)0x20000406 = 0x14; |
| memcpy((void*)0x20000408, |
| "\x79\x61\x6d\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", |
| 16); |
| *(uint64_t*)0x20000188 = 0x58; |
| *(uint64_t*)0x200001d8 = 1; |
| *(uint64_t*)0x200001e0 = 0; |
| *(uint64_t*)0x200001e8 = 0; |
| *(uint32_t*)0x200001f0 = 0; |
| syscall(__NR_sendmsg, r[1], 0x200001c0, 0x40010); |
| break; |
| } |
| } |
| |
| void execute_one() |
| { |
| execute(5); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| for (;;) { |
| loop(); |
| } |
| } |