// https://syzkaller.appspot.com/bug?id=7d3ae3514bf9a76edadf2da36fb388a70e37a3d0 // 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 #include unsigned long long procid; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ { \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ } 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 void use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { DIR* dp; struct dirent* ep; int iter = 0; retry: while (umount2(dir, MNT_DETACH) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, MNT_DETACH) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, MNT_DETACH)) exit(1); } } closedir(dp); int i; for (i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, MNT_DETACH)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } exit(1); } } 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++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); 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; } remove_dir(cwdbuf); } } uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { long res = 0; res = syscall(__NR_socket, 2, 3, 0xa); if (res != -1) r[0] = res; NONFAILING(memcpy((void*)0x200004c0, "nat\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00", 32)); NONFAILING(*(uint32_t*)0x200004e0 = 0x19); NONFAILING(*(uint32_t*)0x200004e4 = 1); NONFAILING(*(uint32_t*)0x200004e8 = 0x1c0); NONFAILING(*(uint64_t*)0x200004f0 = 0x200002c0); NONFAILING(*(uint64_t*)0x200004f8 = 0); NONFAILING(*(uint64_t*)0x20000500 = 0); NONFAILING(*(uint64_t*)0x20000508 = 0x200002f0); NONFAILING(*(uint64_t*)0x20000510 = 0x20000320); NONFAILING(*(uint64_t*)0x20000518 = 0); NONFAILING(*(uint32_t*)0x20000520 = 0x6000000); NONFAILING(*(uint64_t*)0x20000528 = 0); NONFAILING(*(uint64_t*)0x20000530 = 0x200002c0); NONFAILING(*(uint32_t*)0x200002c0 = 0); NONFAILING(memcpy((void*)0x200002c4, "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00", 32)); NONFAILING(*(uint32_t*)0x200002e4 = 0); NONFAILING(*(uint32_t*)0x200002e8 = -1); NONFAILING(*(uint32_t*)0x200002ec = 0); NONFAILING(*(uint32_t*)0x200002f0 = 0); NONFAILING(memcpy((void*)0x200002f4, "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00", 32)); NONFAILING(*(uint32_t*)0x20000314 = 0); NONFAILING(*(uint32_t*)0x20000318 = -1); NONFAILING(*(uint32_t*)0x2000031c = 0); NONFAILING(*(uint32_t*)0x20000320 = 0); NONFAILING(memcpy((void*)0x20000324, "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00", 32)); NONFAILING(*(uint32_t*)0x20000344 = 0); NONFAILING(*(uint32_t*)0x20000348 = -1); NONFAILING(*(uint32_t*)0x2000034c = 0); NONFAILING(*(uint32_t*)0x20000350 = 0); NONFAILING(memcpy((void*)0x20000354, "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00", 32)); NONFAILING(*(uint32_t*)0x20000374 = 0); NONFAILING(*(uint32_t*)0x20000378 = -1); NONFAILING(*(uint32_t*)0x2000037c = 1); NONFAILING(*(uint32_t*)0x20000380 = 0x11); NONFAILING(*(uint32_t*)0x20000384 = 0); NONFAILING(*(uint16_t*)0x20000388 = htobe16(0x806)); NONFAILING(memcpy((void*)0x2000038a, "\x03\x00sf0\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00", 16)); NONFAILING(memcpy((void*)0x2000039a, "dummy0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)); NONFAILING(memcpy((void*)0x200003aa, "ifb0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)); NONFAILING( memcpy((void*)0x200003ba, "lo\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)); NONFAILING(*(uint8_t*)0x200003ca = -1); NONFAILING(*(uint8_t*)0x200003cb = -1); NONFAILING(*(uint8_t*)0x200003cc = -1); NONFAILING(*(uint8_t*)0x200003cd = -1); NONFAILING(*(uint8_t*)0x200003ce = -1); NONFAILING(*(uint8_t*)0x200003cf = -1); NONFAILING(*(uint8_t*)0x200003d0 = 0); NONFAILING(*(uint8_t*)0x200003d1 = 0); NONFAILING(*(uint8_t*)0x200003d2 = 0); NONFAILING(*(uint8_t*)0x200003d3 = 0); NONFAILING(*(uint8_t*)0x200003d4 = 0); NONFAILING(*(uint8_t*)0x200003d5 = 0); NONFAILING(*(uint8_t*)0x200003d6 = -1); NONFAILING(*(uint8_t*)0x200003d7 = -1); NONFAILING(*(uint8_t*)0x200003d8 = -1); NONFAILING(*(uint8_t*)0x200003d9 = -1); NONFAILING(*(uint8_t*)0x200003da = -1); NONFAILING(*(uint8_t*)0x200003db = -1); NONFAILING(*(uint8_t*)0x200003dc = 0); NONFAILING(*(uint8_t*)0x200003dd = 0); NONFAILING(*(uint8_t*)0x200003de = 0); NONFAILING(*(uint8_t*)0x200003df = 0); NONFAILING(*(uint8_t*)0x200003e0 = 0); NONFAILING(*(uint8_t*)0x200003e1 = 0); NONFAILING(*(uint32_t*)0x200003e4 = 0xd0); NONFAILING(*(uint32_t*)0x200003e8 = 0xd0); NONFAILING(*(uint32_t*)0x200003ec = 0x100); NONFAILING(memcpy((void*)0x200003f0, "arp\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00", 32)); NONFAILING(*(uint32_t*)0x20000410 = 0x38); NONFAILING(*(uint16_t*)0x20000418 = htobe16(0)); NONFAILING(*(uint16_t*)0x2000041a = htobe16(0)); NONFAILING(*(uint16_t*)0x2000041c = htobe16(0)); NONFAILING(*(uint32_t*)0x20000420 = htobe32(0xe0000001)); NONFAILING(*(uint32_t*)0x20000424 = htobe32(0)); NONFAILING(*(uint32_t*)0x20000428 = htobe32(0x7f000001)); NONFAILING(*(uint32_t*)0x2000042c = htobe32(0)); NONFAILING(*(uint8_t*)0x20000430 = 0); NONFAILING(*(uint8_t*)0x20000431 = 0); NONFAILING(*(uint8_t*)0x20000432 = 0); NONFAILING(*(uint8_t*)0x20000433 = 0); NONFAILING(*(uint8_t*)0x20000434 = 0); NONFAILING(*(uint8_t*)0x20000435 = 0); NONFAILING(*(uint8_t*)0x20000436 = 0); NONFAILING(*(uint8_t*)0x20000437 = 0); NONFAILING(*(uint8_t*)0x20000438 = 0); NONFAILING(*(uint8_t*)0x20000439 = 0); NONFAILING(*(uint8_t*)0x2000043a = 0); NONFAILING(*(uint8_t*)0x2000043b = 0); NONFAILING(*(uint8_t*)0x2000043c = 0xaa); NONFAILING(*(uint8_t*)0x2000043d = 0xaa); NONFAILING(*(uint8_t*)0x2000043e = 0xaa); NONFAILING(*(uint8_t*)0x2000043f = 0xaa); NONFAILING(*(uint8_t*)0x20000440 = 0xaa); NONFAILING(*(uint8_t*)0x20000441 = 0); NONFAILING(*(uint8_t*)0x20000442 = 0); NONFAILING(*(uint8_t*)0x20000443 = 0); NONFAILING(*(uint8_t*)0x20000444 = 0); NONFAILING(*(uint8_t*)0x20000445 = 0); NONFAILING(*(uint8_t*)0x20000446 = 0); NONFAILING(*(uint8_t*)0x20000447 = 0); NONFAILING(*(uint8_t*)0x20000448 = 0); NONFAILING(*(uint8_t*)0x20000449 = 0); NONFAILING(memcpy((void*)0x20000450, "redirect\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00", 32)); NONFAILING(*(uint32_t*)0x20000470 = 8); NONFAILING(*(uint32_t*)0x20000478 = -1); syscall(__NR_setsockopt, r[0], 0, 0x80, 0x200004c0, 0x238); NONFAILING(*(uint32_t*)0x200000c0 = 0); NONFAILING(*(uint32_t*)0x200000c4 = 0); syscall(__NR_getsockopt, 0xffffff9c, 0x84, 0x7b, 0x200000c0, 0); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); install_segv_handler(); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { use_temporary_dir(); loop(); } } sleep(1000000); return 0; }