| // kernel BUG at fs/ext4/fsync.c:LINE! |
| // https://syzkaller.appspot.com/bug?id=2aee9c7ed306d518b1cb499fb47587aa1396da50 |
| // status:open |
| // 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 <stdarg.h> |
| #include <stdbool.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 bool write_file(const char* file, const char* what, ...) |
| { |
| char buf[1024]; |
| va_list args; |
| va_start(args, what); |
| vsnprintf(buf, sizeof(buf), what, args); |
| va_end(args); |
| buf[sizeof(buf) - 1] = 0; |
| int len = strlen(buf); |
| int fd = open(file, O_WRONLY | O_CLOEXEC); |
| if (fd == -1) |
| return false; |
| if (write(fd, buf, len) != len) { |
| int err = errno; |
| close(fd); |
| errno = err; |
| return false; |
| } |
| close(fd); |
| return true; |
| } |
| |
| 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) { |
| } |
| } |
| |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| write_file("/proc/self/oom_score_adj", "1000"); |
| } |
| |
| 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(); |
| 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; |
| } |
| } |
| } |
| |
| #ifndef __NR_creat |
| #define __NR_creat 8 |
| #endif |
| #ifndef __NR_fchdir |
| #define __NR_fchdir 133 |
| #endif |
| #ifndef __NR_fcntl |
| #define __NR_fcntl 55 |
| #endif |
| #ifndef __NR_io_setup |
| #define __NR_io_setup 245 |
| #endif |
| #ifndef __NR_io_submit |
| #define __NR_io_submit 248 |
| #endif |
| #ifndef __NR_ioctl |
| #define __NR_ioctl 54 |
| #endif |
| #ifndef __NR_mmap |
| #define __NR_mmap 192 |
| #endif |
| #ifndef __NR_openat |
| #define __NR_openat 295 |
| #endif |
| #ifndef __NR_write |
| #define __NR_write 4 |
| #endif |
| #undef __NR_mmap |
| #define __NR_mmap __NR_mmap2 |
| |
| uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0, |
| 0xffffffffffffffff}; |
| |
| void execute_one(void) |
| { |
| intptr_t res = 0; |
| memcpy((void*)0x20000100, "./cgroup.cpu\000", 13); |
| res = syscall(__NR_openat, 0xffffff9c, 0x20000100, 0x200002, 0); |
| if (res != -1) |
| r[0] = res; |
| syscall(__NR_fchdir, (intptr_t)r[0]); |
| memcpy((void*)0x20000180, "./bus\000", 6); |
| res = syscall(__NR_creat, 0x20000180, 0); |
| if (res != -1) |
| r[1] = res; |
| res = syscall(__NR_io_setup, 0x85, 0x20000040); |
| if (res != -1) |
| r[2] = *(uint32_t*)0x20000040; |
| memcpy((void*)0x20000700, "./bus\000", 6); |
| res = syscall(__NR_creat, 0x20000700, 0); |
| if (res != -1) |
| r[3] = res; |
| syscall(__NR_fcntl, (intptr_t)r[1], 4, 0x44800); |
| memcpy((void*)0x20000200, "threaded\000", 9); |
| syscall(__NR_write, (intptr_t)r[3], 0x20000200, 0xf642e7e); |
| *(uint32_t*)0x20000540 = 0x200000c0; |
| *(uint64_t*)0x200000c0 = 0; |
| *(uint32_t*)0x200000c8 = 0; |
| *(uint32_t*)0x200000cc = 0; |
| *(uint16_t*)0x200000d0 = 1; |
| *(uint16_t*)0x200000d2 = 0; |
| *(uint32_t*)0x200000d4 = r[1]; |
| *(uint64_t*)0x200000d8 = 0x20000000; |
| *(uint64_t*)0x200000e0 = 0x10000; |
| *(uint64_t*)0x200000e8 = 0; |
| *(uint64_t*)0x200000f0 = 0; |
| *(uint32_t*)0x200000f8 = 0; |
| *(uint32_t*)0x200000fc = -1; |
| syscall(__NR_io_submit, (intptr_t)r[2], 1, 0x20000540); |
| *(uint32_t*)0x200001c0 = 0xa; |
| syscall(__NR_ioctl, (intptr_t)r[1], 0x40046602, 0x200001c0); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| loop(); |
| return 0; |
| } |