// https://syzkaller.appspot.com/bug?id=b0e7f31f15d9883515b016e371be1aaeea31df15 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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); for (int 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 = 0; for (;; 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 < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; syscall(__NR_socketpair, 1ul, 5ul, 0, 0x200000c0ul); { int i; for (i = 0; i < 32; i++) { syscall(__NR_socketpair, 1ul, 5ul, 0, 0x200000c0ul); } } memcpy((void*)0x200015c0, "/dev/vhost-vsock\000", 17); res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x200015c0ul, 2ul, 0ul); if (res != -1) r[0] = res; syscall(__NR_ioctl, r[0], 0xaf01, 0ul); syscall(__NR_ioctl, r[0], 0x4008af03, 0x20000080ul); *(uint32_t*)0x20000300 = 0; *(uint32_t*)0x20000304 = 0; *(uint64_t*)0x20000308 = 0; *(uint64_t*)0x20000310 = 0x20000140; *(uint64_t*)0x20000318 = 0; *(uint64_t*)0x20000320 = 0; syscall(__NR_ioctl, r[0], 0x4028af11, 0x20000300ul); res = syscall(__NR_eventfd, 0); if (res != -1) r[1] = res; *(uint32_t*)0x20000080 = 1; *(uint32_t*)0x20000084 = 0x7f; syscall(__NR_ioctl, r[0], 0x4008af12, 0x20000080ul); *(uint32_t*)0x20000240 = r[1]; syscall(__NR_ioctl, r[0], 0x4004af07, 0x20000240ul); *(uint32_t*)0x20000040 = 1; *(uint32_t*)0x20000044 = r[1]; syscall(__NR_ioctl, r[0], 0x4008af20, 0x20000040ul); *(uint32_t*)0x20000280 = 1; *(uint32_t*)0x20000284 = 1; *(uint64_t*)0x20000288 = 0x20000380; *(uint64_t*)0x20000290 = 0x200000c0; *(uint64_t*)0x20000298 = 0x20000480; *(uint64_t*)0x200002a0 = 0; syscall(__NR_ioctl, r[0], 0x4028af11, 0x20000280ul); *(uint32_t*)0x20000000 = 1; syscall(__NR_ioctl, r[0], 0x4004af61, 0x20000000ul); } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); loop(); return 0; }