// https://syzkaller.appspot.com/bug?id=bbfa653205516be2a33b51c381ef827c534ba596 // 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 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 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); 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) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } #define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak" static void setup_leak() { if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); sleep(5); if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); if (!write_file(KMEMLEAK_FILE, "clear")) exit(1); } static void check_leaks(void) { int fd = open(KMEMLEAK_FILE, O_RDWR); if (fd == -1) exit(1); uint64_t start = current_time_ms(); if (write(fd, "scan", 4) != 4) exit(1); sleep(1); while (current_time_ms() - start < 4 * 1000) sleep(1); if (write(fd, "scan", 4) != 4) exit(1); static char buf[128 << 10]; ssize_t n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); int nleaks = 0; if (n != 0) { sleep(1); if (write(fd, "scan", 4) != 4) exit(1); if (lseek(fd, 0, SEEK_SET) < 0) exit(1); n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); buf[n] = 0; char* pos = buf; char* end = buf + n; while (pos < end) { char* next = strstr(pos + 1, "unreferenced object"); if (!next) next = end; char prev = *next; *next = 0; fprintf(stderr, "BUG: memory leak\n%s\n", pos); *next = prev; pos = next; nleaks++; } } if (write(fd, "clear", 5) != 5) exit(1); close(fd); if (nleaks) exit(1); } 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; } check_leaks(); } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 0xa, 0x80000000000001, 0x84); if (res != -1) r[0] = res; NONFAILING(*(uint16_t*)0x20cf6fe4 = 0xa); NONFAILING(*(uint16_t*)0x20cf6fe6 = htobe16(0x4e23)); NONFAILING(*(uint32_t*)0x20cf6fe8 = htobe32(0)); NONFAILING(*(uint64_t*)0x20cf6fec = htobe64(0)); NONFAILING(*(uint64_t*)0x20cf6ff4 = htobe64(1)); NONFAILING(*(uint32_t*)0x20cf6ffc = 0); syscall(__NR_setsockopt, r[0], 0x84, 0x64, 0x20cf6fe4, 0x1c); NONFAILING(*(uint16_t*)0x208c0000 = 0xa); NONFAILING(*(uint16_t*)0x208c0002 = htobe16(0x4e23)); NONFAILING(*(uint32_t*)0x208c0004 = htobe32(0)); NONFAILING(*(uint64_t*)0x208c0008 = htobe64(0)); NONFAILING(*(uint64_t*)0x208c0010 = htobe64(1)); NONFAILING(*(uint32_t*)0x208c0018 = 0); syscall(__NR_connect, r[0], 0x208c0000, 0x1c); NONFAILING(*(uint64_t*)0x2060d000 = 0); NONFAILING(*(uint32_t*)0x2060d008 = 0); NONFAILING(*(uint64_t*)0x2060d010 = 0x20c38ff0); NONFAILING(*(uint64_t*)0x20c38ff0 = 0x20000080); NONFAILING(memcpy((void*)0x20000080, "\000", 1)); NONFAILING(*(uint64_t*)0x20c38ff8 = 1); NONFAILING(*(uint64_t*)0x2060d018 = 1); NONFAILING(*(uint64_t*)0x2060d020 = 0); NONFAILING(*(uint64_t*)0x2060d028 = 0); NONFAILING(*(uint32_t*)0x2060d030 = 0); NONFAILING(*(uint32_t*)0x2060d038 = 0); syscall(__NR_sendmmsg, r[0], 0x2060d000, 1, 0x8000); res = syscall(__NR_socket, 2, 1, 0); if (res != -1) r[1] = res; NONFAILING( memcpy((void*)0x20000440, "lo\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16)); NONFAILING(*(uint16_t*)0x20000450 = 0); syscall(__NR_ioctl, r[1], 0x8914, 0x20000440); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); setup_leak(); install_segv_handler(); loop(); return 0; }