// https://syzkaller.appspot.com/bug?id=d71f28b21dad3419f79cf010f30167620cb0cfff // 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 long syz_open_dev(volatile long a0, volatile long a1, volatile 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); 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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000080, "/dev/loop#\000", 11); res = -1; res = syz_open_dev(0x20000080, 0, 0); if (res != -1) r[0] = res; syscall(__NR_ioctl, r[0], 0x4c05, 0x20000200ul); memcpy((void*)0x20000080, "/dev/loop#\000", 11); res = -1; res = syz_open_dev(0x20000080, 0, 0); if (res != -1) r[1] = res; memcpy((void*)0x20002140, "/proc/self/net/pfkey\000", 21); res = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20002140ul, 0ul, 0ul); if (res != -1) r[2] = res; *(uint32_t*)0x200000c0 = r[2]; *(uint32_t*)0x200000c4 = 0x1000; *(uint64_t*)0x200000c8 = 0; *(uint64_t*)0x200000d0 = 0; *(uint64_t*)0x200000d8 = 0; *(uint64_t*)0x200000e0 = 0; *(uint64_t*)0x200000e8 = 0xfffffffffffffffd; *(uint32_t*)0x200000f0 = 0; *(uint32_t*)0x200000f4 = 0; *(uint32_t*)0x200000f8 = 0; *(uint32_t*)0x200000fc = 8; memcpy((void*)0x20000100, "\xf2\xd9\x32\x8a\x0c\x3d\x9e\x8c\xb2\xa9\x07\xcb\x75\x1b\x59\xfa\x2d" "\x89\x74\x53\x36\xe7\x21\x1d\xe1\x43\x78\x0a\xb9\xe3\x2d\x54\xe9\x54" "\x03\x8a\xdb\x31\x93\x72\x4b\x21\x54\x14\x13\xb2\xf1\xf2\xa7\x50\xfb" "\xe4\x95\x9d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); memcpy((void*)0x20000140, "\x35\x83\x0b\xfb\xea\xe7\x7b\x4c\x39\xcd\x03\x89\xbd\x8a\x13\xef\x86" "\xb5\xdb\x94\xe8\x40\xe0\xab\x69\x52\xeb\xb4\x50\xb8\xdf\xb3\xaa\xb3" "\x1e\xe0\xa9\xad\x07\xbb\x1d\x29\x5b\xa8\x75\x1c\x09\x6b\x99\xc9\x01" "\x60\xcd\xb7\x0f\x57\x62\x11\x61\x56\x9f\xc0\x31\x3a", 64); memcpy((void*)0x20000180, "\x95\x12\x3a\x9d\xf3\x79\xdf\x28\xf8\x94\x34\xe3\xc1\xd6\x7c\x38\xef" "\x57\xd6\xe1\xe0\xaa\x11\x35\x12\x79\x34\x37\x25\x9b\x48\x8f", 32); *(uint64_t*)0x200001a0 = 4; *(uint64_t*)0x200001a8 = 0xfffffffffffffff9; memset((void*)0x200001b0, 0, 64); syscall(__NR_ioctl, r[1], 0x4c0a, 0x200000c0ul); } 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; }