| // INFO: task hung in iterate_supers |
| // https://syzkaller.appspot.com/bug?id=3c0c173ff55822aacb81ce7ae27a6676fba29a5c |
| // 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) - 1); |
| 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 (__atomic_load_n(&running, __ATOMIC_RELAXED)) |
| usleep((call == num_calls - 1) ? 10000 : 1000); |
| break; |
| } |
| } |
| } |
| } |
| |
| #ifndef __NR_memfd_create |
| #define __NR_memfd_create 319 |
| #endif |
| |
| uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, |
| 0xffffffffffffffff}; |
| unsigned long long procid; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| syscall(__NR_socket, 0xa, 0x1000000000002, 0); |
| break; |
| case 1: |
| memcpy((void*)0x20000200, "/dev/loop#", 11); |
| res = syz_open_dev(0x20000200, 0, 0x1000082); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 2: |
| memcpy((void*)0x20000140, |
| "\x74\x08\x6e\x75\x00\x00\x00\x00\x00\x00\x00\x00\x00\x8c\x00", 15); |
| res = syscall(__NR_memfd_create, 0x20000140, 2); |
| if (res != -1) |
| r[1] = res; |
| break; |
| case 3: |
| syscall(__NR_ioctl, r[0], 0x4c00, r[1]); |
| break; |
| case 4: |
| syscall(__NR_sync); |
| break; |
| case 5: |
| *(uint64_t*)0x20000180 = 0x20000040; |
| *(uint64_t*)0x20000188 = 0; |
| syscall(__NR_pwritev, r[0], 0x20000180, 1, 0); |
| break; |
| case 6: |
| res = syscall(__NR_pipe2, 0x20000500, 0); |
| if (res != -1) { |
| r[2] = *(uint32_t*)0x20000500; |
| r[3] = *(uint32_t*)0x20000504; |
| } |
| break; |
| case 7: |
| memcpy((void*)0x20000140, "./file0", 8); |
| syscall(__NR_mkdir, 0x20000140, 0); |
| break; |
| case 8: |
| memcpy((void*)0x200000c0, "./file0", 8); |
| memcpy((void*)0x20000340, "9p", 3); |
| memcpy((void*)0x200003c0, "trans=fd,", 9); |
| memcpy((void*)0x200003c9, "rfdno", 5); |
| *(uint8_t*)0x200003ce = 0x3d; |
| sprintf((char*)0x200003cf, "0x%016llx", (long long)r[2]); |
| *(uint8_t*)0x200003e1 = 0x2c; |
| memcpy((void*)0x200003e2, "wfdno", 5); |
| *(uint8_t*)0x200003e7 = 0x3d; |
| sprintf((char*)0x200003e8, "0x%016llx", (long long)r[3]); |
| *(uint8_t*)0x200003fa = 0x2c; |
| memcpy((void*)0x200003fb, "version=9p2000.u", 16); |
| *(uint8_t*)0x2000040b = 0x2c; |
| *(uint8_t*)0x2000040c = 0; |
| syscall(__NR_mount, 0, 0x200000c0, 0x20000340, 0, 0x200003c0); |
| break; |
| case 9: |
| memcpy((void*)0x20000180, |
| "\x79\x04\x00\x00\x7d\x01\x00\x05\x00\x58\x00\x00\x00\x00\x00\x00" |
| "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" |
| "\x00\x00\x00\x00\x00\x00\x00\x00\x23\x00\x00\x00\x00\x39\x00\x00" |
| "\x00\x00\x00\x10\x00\x76\x65\x72\x73\x69\x6f\x6e\x3d\x39\x70\x32" |
| "\x30\x30\x30\x2e\x75\x0d\x00\x77\x6c\x61\x6e\x31\x76\x62\x6f\x78" |
| "\x6e\x65\x74\x30\x03\x00\x39\x70\x00\x05\x00\x72\x66\x64\x6e\x6f" |
| "\x0c\x00\x76\x9a\xae\x6d\x5f\xff\xf0\x68\xa6\xbe\x6b\x2c\xc3\xfd" |
| "\x62\x6f\x78\x6e\x65\x74\x31\x28\x7d\x25\x24", |
| 123); |
| *(uint32_t*)0x200001fb = 0; |
| *(uint32_t*)0x200001ff = 0; |
| *(uint32_t*)0x20000203 = 0; |
| syscall(__NR_write, r[3], 0x20000180, 0x87); |
| break; |
| } |
| } |
| |
| void execute_one() |
| { |
| execute(10); |
| } |
| |
| 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; |
| } |