| // INFO: rcu detected stall in tty_ioctl |
| // https://syzkaller.appspot.com/bug?id=6c86f8057d87186f6b9dd52ed247f5e5781d142f |
| // 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 <stdio.h> |
| #include <stdlib.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| #include <stdint.h> |
| #include <string.h> |
| |
| 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 test(); |
| |
| void loop() |
| { |
| while (1) { |
| test(); |
| } |
| } |
| |
| 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; |
| } |
| } |
| } |
| } |
| |
| long r[2]; |
| uint64_t procid; |
| void execute_call(int call) |
| { |
| switch (call) { |
| case 0: |
| syscall(__NR_mmap, 0x20000000, 0xfff000, 0x3, 0x32, 0xffffffff, |
| 0x0); |
| break; |
| case 1: |
| memcpy((void*)0x20fe4000, "/dev/ptmx", 10); |
| r[0] = syscall(__NR_openat, 0xffffffffffffff9c, 0x20fe4000, 0x400, |
| 0x0); |
| break; |
| case 2: |
| *(uint16_t*)0x20fd6000 = 0x0; |
| *(uint16_t*)0x20fd6002 = 0x0; |
| *(uint16_t*)0x20fd6004 = 0x0; |
| *(uint16_t*)0x20fd6006 = 0x0; |
| *(uint8_t*)0x20fd6008 = 0x0; |
| *(uint8_t*)0x20fd6009 = 0x0; |
| *(uint8_t*)0x20fd600a = 0x0; |
| *(uint8_t*)0x20fd600b = 0x0; |
| *(uint32_t*)0x20fd600c = 0xfffffff7; |
| *(uint8_t*)0x20fd6010 = 0x0; |
| syscall(__NR_ioctl, r[0], 0x5402, 0x20fd6000); |
| break; |
| case 3: |
| *(uint32_t*)0x203fffdc = 0x0; |
| *(uint32_t*)0x203fffe0 = 0x1; |
| *(uint32_t*)0x203fffe4 = 0x2b; |
| *(uint32_t*)0x203fffe8 = 0xfffffff8; |
| *(uint8_t*)0x203fffec = 0x6; |
| *(uint8_t*)0x203fffed = 0x7; |
| *(uint8_t*)0x203fffee = 0x0; |
| *(uint8_t*)0x203fffef = 0xfe; |
| *(uint32_t*)0x203ffff0 = 0x0; |
| *(uint32_t*)0x203ffff4 = 0x0; |
| *(uint32_t*)0x203ffff8 = 0x0; |
| *(uint32_t*)0x203ffffc = 0x69953b77; |
| syscall(__NR_ioctl, r[0], 0x40045431, 0x203fffdc); |
| break; |
| case 4: |
| r[1] = syz_open_pts(r[0], 0x0); |
| break; |
| case 5: |
| syscall(__NR_ioctl, r[1], 0x541b, 0x20a6bffc); |
| break; |
| case 6: |
| *(uint64_t*)0x20fd6000 = 0x20313f29; |
| *(uint64_t*)0x20fd6008 = 0x1; |
| syscall(__NR_readv, r[1], 0x20fd6000, 0x1); |
| break; |
| case 7: |
| syscall(__NR_ioctl, r[0], 0x540a, 0x2); |
| break; |
| } |
| } |
| |
| void test() |
| { |
| memset(r, -1, sizeof(r)); |
| execute(8); |
| collide = 1; |
| execute(8); |
| } |
| |
| int main() |
| { |
| int i; |
| for (i = 0; i < 8; i++) { |
| if (fork() == 0) { |
| procid = i; |
| loop(); |
| return 0; |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |