| // general protection fault in n_tty_set_termios |
| // https://syzkaller.appspot.com/bug?id=2147712a6ea86494e8c7ff9ded1847f5109a54d5 |
| // status:dup |
| // 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 <sys/ioctl.h> |
| #include <sys/stat.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; \ |
| } |
| |
| static uintptr_t syz_open_pts(uintptr_t a0, uintptr_t a1) |
| { |
| int ptyno = 0; |
| if (ioctl(a0, TIOCGPTN, &ptyno)) |
| return -1; |
| char buf[128]; |
| sprintf(buf, "/dev/pts/%d", ptyno); |
| return open(buf, a1, 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; |
| } |
| } |
| } |
| } |
| |
| uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; |
| unsigned long long procid; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| memcpy((void*)0x20000140, "/dev/ptmx", 10); |
| res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000140, 0x20000, 0); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 1: |
| *(uint32_t*)0x203b9fdc = 0; |
| *(uint32_t*)0x203b9fe0 = 0; |
| *(uint32_t*)0x203b9fe4 = 0; |
| *(uint32_t*)0x203b9fe8 = 0; |
| *(uint8_t*)0x203b9fec = 0; |
| *(uint8_t*)0x203b9fed = 0; |
| *(uint8_t*)0x203b9fee = 0; |
| *(uint8_t*)0x203b9fef = 0; |
| *(uint32_t*)0x203b9ff0 = 0; |
| *(uint32_t*)0x203b9ff4 = 0; |
| *(uint32_t*)0x203b9ff8 = 0; |
| *(uint32_t*)0x203b9ffc = 0; |
| syscall(__NR_ioctl, r[0], 0x40045431, 0x203b9fdc); |
| break; |
| case 2: |
| res = syz_open_pts(r[0], 0); |
| if (res != -1) |
| r[1] = res; |
| break; |
| case 3: |
| *(uint32_t*)0x2025c000 = 2; |
| *(uint32_t*)0x2025c004 = 0x70; |
| *(uint8_t*)0x2025c008 = 0xe5; |
| *(uint8_t*)0x2025c009 = 0; |
| *(uint8_t*)0x2025c00a = 0; |
| *(uint8_t*)0x2025c00b = 0; |
| *(uint32_t*)0x2025c00c = 0; |
| *(uint64_t*)0x2025c010 = 0; |
| *(uint64_t*)0x2025c018 = 0; |
| *(uint64_t*)0x2025c020 = 0; |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 0, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 1, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 2, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 3, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 4, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 5, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 6, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 7, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 8, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 9, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 10, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 11, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 12, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 13, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 14, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 15, 2); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 17, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 18, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 19, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 20, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 21, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 22, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 23, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 24, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 25, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 26, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 27, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 28, 1); |
| STORE_BY_BITMASK(uint64_t, 0x2025c028, 0, 29, 35); |
| *(uint32_t*)0x2025c030 = 0; |
| *(uint32_t*)0x2025c034 = 0; |
| *(uint64_t*)0x2025c038 = 0x20000000; |
| *(uint64_t*)0x2025c040 = 0; |
| *(uint64_t*)0x2025c048 = 0; |
| *(uint64_t*)0x2025c050 = 0; |
| *(uint32_t*)0x2025c058 = 0; |
| *(uint32_t*)0x2025c05c = 0; |
| *(uint64_t*)0x2025c060 = 0; |
| *(uint32_t*)0x2025c068 = 0; |
| *(uint16_t*)0x2025c06c = 0; |
| *(uint16_t*)0x2025c06e = 0; |
| syscall(__NR_perf_event_open, 0x2025c000, 0, 0, -1, 0); |
| break; |
| case 4: |
| *(uint32_t*)0x20000000 = 0; |
| *(uint32_t*)0x20000004 = 0; |
| *(uint32_t*)0x20000008 = 0; |
| *(uint32_t*)0x2000000c = 0; |
| *(uint8_t*)0x20000010 = 0; |
| *(uint8_t*)0x20000011 = 0; |
| *(uint8_t*)0x20000012 = 0; |
| *(uint8_t*)0x20000013 = 0; |
| *(uint32_t*)0x20000014 = 0; |
| *(uint32_t*)0x20000018 = 0; |
| *(uint32_t*)0x2000001c = 0; |
| *(uint32_t*)0x20000020 = 0; |
| syscall(__NR_ioctl, r[1], 0x5437, 0x20000000); |
| break; |
| case 5: |
| *(uint32_t*)0x20000040 = 0; |
| *(uint32_t*)0x20000044 = 0; |
| *(uint32_t*)0x20000048 = 0; |
| *(uint32_t*)0x2000004c = 0x9a; |
| *(uint8_t*)0x20000050 = -1; |
| *(uint8_t*)0x20000051 = 0; |
| *(uint8_t*)0x20000052 = 0; |
| *(uint8_t*)0x20000053 = 0; |
| *(uint32_t*)0x20000054 = 0x1000; |
| *(uint32_t*)0x20000058 = 5; |
| *(uint32_t*)0x2000005c = 0; |
| *(uint32_t*)0x20000060 = 0; |
| syscall(__NR_ioctl, r[0], 0x5402, 0x20000040); |
| break; |
| case 6: |
| syz_open_pts(r[0], 0); |
| break; |
| } |
| } |
| |
| void execute_one() |
| { |
| execute(7); |
| collide = 1; |
| execute(7); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| for (procid = 0; procid < 8; procid++) { |
| if (fork() == 0) { |
| for (;;) { |
| loop(); |
| } |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |