| // general protection fault in __free_pages |
| // https://syzkaller.appspot.com/bug?id=3c1f47967b7cbd399d3ba3e65f297a29aa1c5f92 |
| // status:open |
| // 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[1] = {0xffffffffffffffff}; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| memcpy((void*)0x200000c0, "/dev/sg#", 9); |
| res = syz_open_dev(0x200000c0, 0, 2); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 1: |
| memcpy((void*)0x20000000, "\xb6\x3d\xb8\x5e\x1e\x8d\x02\x00\x00\x00\x00\x00" |
| "\x3e\xf0\x01\x1d\xcc\x60\x6a\xed\x69\xd2\xbc\x70" |
| "\x37\xce\xbc\x9b\xc2\xfe\xff\xff\xff\xff\xff\xff" |
| "\xff\xe2\x2c\x9b\x16\x00\x96\xaa\x1f\xae", |
| 46); |
| syscall(__NR_write, r[0], 0x20000000, 0x2e); |
| break; |
| case 2: |
| *(uint64_t*)0x2085dff0 = 0x20e94000; |
| *(uint64_t*)0x2085dff8 = 0x10024; |
| syscall(__NR_readv, r[0], 0x2085dff0, 0x146); |
| break; |
| } |
| } |
| |
| void execute_one() |
| { |
| execute(3); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| for (;;) { |
| loop(); |
| } |
| } |