// https://syzkaller.appspot.com/bug?id=914b8f7fda6f80e47f0b3f52dc4045b0f9e1ab46 // 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 #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif 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*)0x20000180, "/dev/loop#\000", 11); res = -1; res = syz_open_dev(0x20000180, 0, 0x107382); if (res != -1) r[0] = res; memcpy((void*)0x20000240, ".^\305", 3); res = syscall(__NR_memfd_create, 0x20000240ul, 0ul); if (res != -1) r[1] = res; syscall(__NR_ioctl, r[0], 0x4c00, r[1]); *(uint32_t*)0x20000280 = 0; *(uint16_t*)0x20000288 = 0; *(uint64_t*)0x20000290 = 0; *(uint16_t*)0x20000298 = 0; *(uint32_t*)0x200002a0 = 0x80000008; *(uint32_t*)0x200002a4 = 0; *(uint32_t*)0x200002a8 = 0; *(uint32_t*)0x200002ac = 0x18; memcpy((void*)0x200002b0, "\x8d\x00\x67\x21\x40\xcf\x3f\x69\x79\xaf\x83\xf1\x21\x7d\x9b\x1b\x75" "\xed\x47\x20\x7f\xe1\x33\x9d\x07\xd6\xda\x4d\x0f\xa3\xd4\x02\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xeb\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); memcpy((void*)0x200002f0, "\xa5\x80\x24\x1d\x97\x43\x37\xfa\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x08\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x20000310 = 0x1001; *(uint64_t*)0x20000318 = 0xaf; *(uint32_t*)0x20000320 = 0; syscall(__NR_ioctl, r[0], 0x4c05, 0x20000280ul); memcpy((void*)0x20000180, "/dev/loop#\000", 11); res = -1; res = syz_open_dev(0x20000180, 0, 0); if (res != -1) r[2] = res; *(uint32_t*)0x20000280 = 0; *(uint16_t*)0x20000288 = 0; *(uint64_t*)0x20000290 = 0; *(uint16_t*)0x20000298 = 0; *(uint32_t*)0x200002a0 = 0x80000008; *(uint32_t*)0x200002a4 = 0; *(uint32_t*)0x200002a8 = 0x18; *(uint32_t*)0x200002ac = 0x18; memcpy((void*)0x200002b0, "\x8d\x00\x67\x21\x40\xcf\x3f\x69\x79\xaf\x83\xf1\x21\x7d\x9b\x1b\x75" "\xed\x47\x20\x7f\xe1\x33\x9d\x07\xd6\xda\x4d\x0f\xa3\xd4\x02\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xeb\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); memcpy((void*)0x200002f0, "\xa5\x80\x24\x1d\x97\x43\x37\xfa\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x08\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); *(uint64_t*)0x20000310 = 0x1001; *(uint64_t*)0x20000318 = 0xaf; *(uint32_t*)0x20000320 = 0; syscall(__NR_ioctl, r[2], 0x4c02, 0x20000280ul); } 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; }