// https://syzkaller.appspot.com/bug?id=4aeceeb1204dfc6707f976a7a702e18b773b26f6 // 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); 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(); 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; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { long res = 0; res = syscall(__NR_socket, 0x1e, 1, 0); if (res != -1) r[0] = res; *(uint64_t*)0x203bbfc8 = 0x20fdbf80; *(uint16_t*)0x20fdbf80 = 0x1e; memcpy((void*)0x20fdbf82, "\x02\xff\x01\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x0a\xe7\x7f" "\x5b\xf8\x6c\x48\x02\x00\x02\x00\x00\x00\xf1\xff\xff\xff\x00\x9a\x48" "\x00\x75\xe6\xa5\x00\x00\xde\x01\x03\x00\x00\x00\x00\xe4\xff\x06\x4b" "\x3f\x01\x3a\x00\x00\x00\x08\x00\x00\x00\x8f\x00\x00\x00\x00\xac\x50" "\xd5\xfe\x32\xc4\x00\x00\x00\x00\x7f\xff\xff\xff\x6a\x00\x83\x56\xed" "\xb9\xa6\x34\x1c\x1f\xd4\x56\x24\x28\x1e\x00\x07\x0e\xcd\xdd\x02\x06" "\xc3\x97\x50\xc4\x00\x00\xfd\x00\x00\x09\x00\x00\x00\x00\x00\x0b\x00" "\x00\xdb\x00\x00\x04\xda\x36", 126); *(uint32_t*)0x203bbfd0 = 0x80; *(uint64_t*)0x203bbfd8 = 0; *(uint64_t*)0x203bbfe0 = 0; *(uint64_t*)0x203bbfe8 = 0; *(uint64_t*)0x203bbff0 = 0; *(uint32_t*)0x203bbff8 = 0; syscall(__NR_sendmsg, r[0], 0x203bbfc8, 0); *(uint32_t*)0x200000c0 = 5; *(uint16_t*)0x200000c4 = 0x10; *(uint16_t*)0x200000c6 = 0xfa00; *(uint64_t*)0x200000c8 = 0x20000280; *(uint32_t*)0x200000d0 = -1; *(uint32_t*)0x200000d4 = 0; syscall(__NR_write, r[0], 0x200000c0, 0x152610); syscall(__NR_bind, -1, 0, 0); syscall(__NR_ioctl, -1, 0xc0045516, 0); syscall(__NR_setsockopt, -1, 0, 0x48c, 0, 0); syscall(__NR_signalfd4, -1, 0, 0, 0x80800); syscall(__NR_ioctl, -1, 0xae41, 0); syscall(__NR_setsockopt, -1, 0x28, 2, 0, 0); syscall(__NR_ioctl, -1, 0x800000000008982, 0); res = syscall(__NR_openat, 0xffffffffffffff9c, 0, 0, 0); if (res != -1) r[1] = res; syscall(__NR_socket, 0x10, 1, 0); syscall(__NR_ioctl, r[1], 0xae01, 0); syscall(__NR_getsockopt, -1, 0x84, 0x20, 0, 0); syscall(__NR_mremap, 0x20ffd000, 0x3000, 0x4000, 0, 0x20ffc000); syscall(__NR_openat, 0xffffff9c, 0, 0, 0); syscall(__NR_setsockopt, -1, 1, 0x1a, 0, 0); syscall(__NR_semctl, 0, 3, 3, 0); syscall(__NR_setsockopt, -1, 0x84, 0x12, 0, 0); syz_open_dev(0, 0, 0); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }