| // INFO: task hung in flush_workqueue |
| // https://syzkaller.appspot.com/bug?id=a8afc55e6cd0cac79fd97a5c0d2272751dc558fc |
| // status:fixed |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/prctl.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| static void sleep_ms(uint64_t ms) |
| { |
| usleep(ms * 1000); |
| } |
| |
| static uint64_t current_time_ms(void) |
| { |
| struct timespec ts; |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| exit(1); |
| return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; |
| } |
| |
| static long syz_open_dev(long a0, long a1, long 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 kill_and_wait(int pid, int* status) |
| { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| int i; |
| for (i = 0; i < 100; i++) { |
| if (waitpid(-1, status, WNOHANG | __WALL) == pid) |
| return; |
| usleep(1000); |
| } |
| DIR* dir = opendir("/sys/fs/fuse/connections"); |
| if (dir) { |
| for (;;) { |
| struct dirent* ent = readdir(dir); |
| if (!ent) |
| break; |
| if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) |
| continue; |
| char abort[300]; |
| snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", |
| ent->d_name); |
| int fd = open(abort, O_WRONLY); |
| if (fd == -1) { |
| continue; |
| } |
| if (write(fd, abort, 1) < 0) { |
| } |
| close(fd); |
| } |
| closedir(dir); |
| } else { |
| } |
| while (waitpid(-1, status, __WALL) != pid) { |
| } |
| } |
| |
| #define SYZ_HAVE_SETUP_TEST 1 |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| } |
| |
| #define SYZ_HAVE_RESET_TEST 1 |
| static void reset_test() |
| { |
| int fd; |
| for (fd = 3; fd < 30; fd++) |
| close(fd); |
| } |
| |
| static void execute_one(void); |
| |
| #define WAIT_FLAGS __WALL |
| |
| static void loop(void) |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| exit(1); |
| if (pid == 0) { |
| setup_test(); |
| execute_one(); |
| reset_test(); |
| exit(0); |
| } |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) |
| break; |
| sleep_ms(1); |
| if (current_time_ms() - start < 5 * 1000) |
| continue; |
| kill_and_wait(pid, &status); |
| break; |
| } |
| } |
| } |
| |
| uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; |
| |
| void execute_one(void) |
| { |
| long res = 0; |
| memcpy((void*)0x200002c0, "/dev/video#", 12); |
| res = syz_open_dev(0x200002c0, 0x7ffffffd, 0); |
| if (res != -1) |
| r[0] = res; |
| *(uint32_t*)0x200000c0 = 0; |
| *(uint32_t*)0x200000c4 = 0x8000; |
| *(uint32_t*)0x200000c8 = 2; |
| *(uint32_t*)0x200000d0 = 1; |
| *(uint32_t*)0x200000d8 = 0; |
| *(uint32_t*)0x200000dc = 0; |
| *(uint32_t*)0x200000e0 = 0; |
| *(uint32_t*)0x200000e4 = 0; |
| *(uint32_t*)0x200000e8 = 0; |
| *(uint32_t*)0x200000ec = 0x15182c; |
| *(uint32_t*)0x200000f0 = 0; |
| *(uint32_t*)0x200000f4 = 0; |
| *(uint32_t*)0x200000f8 = 0; |
| *(uint32_t*)0x200000fc = 0; |
| *(uint32_t*)0x20000100 = 0; |
| *(uint32_t*)0x20000104 = 0; |
| *(uint32_t*)0x200001a0 = 0; |
| *(uint32_t*)0x200001a4 = 0; |
| *(uint32_t*)0x200001a8 = 0; |
| *(uint32_t*)0x200001ac = 0; |
| *(uint32_t*)0x200001b0 = 0; |
| *(uint32_t*)0x200001b4 = 0; |
| *(uint32_t*)0x200001b8 = 0; |
| *(uint32_t*)0x200001bc = 0; |
| syscall(__NR_ioctl, r[0], 0xc100565c, 0x200000c0); |
| *(uint32_t*)0x20000240 = 1; |
| syscall(__NR_ioctl, r[0], 0x40045612, 0x20000240); |
| res = syscall(__NR_socket, 0x2b, 1, 0); |
| if (res != -1) |
| r[1] = res; |
| syscall(__NR_listen, r[1], 0); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| loop(); |
| return 0; |
| } |