// 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 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 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); } 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; } #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); } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); setup_leak(); install_segv_handler(); use_temporary_dir(); intptr_t res = 0; res = syscall(__NR_socket, 0xa, 1, 0x84); if (res != -1) r[0] = res; NONFAILING(*(uint16_t*)0x20ef8cfd = 0xa); NONFAILING(*(uint16_t*)0x20ef8cff = htobe16(0x4e23)); NONFAILING(*(uint32_t*)0x20ef8d01 = htobe32(0)); NONFAILING(*(uint64_t*)0x20ef8d05 = htobe64(0)); NONFAILING(*(uint64_t*)0x20ef8d0d = htobe64(1)); NONFAILING(*(uint32_t*)0x20ef8d15 = 0); syscall(__NR_bind, r[0], 0x20ef8cfd, 0x1c); syscall(__NR_listen, r[0], 0x7ffd); res = syscall(__NR_socket, 0xa, 1, 0x84); if (res != -1) r[1] = res; NONFAILING(*(uint16_t*)0x20000000 = 0xa); NONFAILING(*(uint16_t*)0x20000002 = htobe16(0x4e23)); NONFAILING(*(uint32_t*)0x20000004 = htobe32(0)); NONFAILING(*(uint64_t*)0x20000008 = htobe64(0)); NONFAILING(*(uint64_t*)0x20000010 = htobe64(1)); NONFAILING(*(uint32_t*)0x20000018 = 0); syscall(__NR_setsockopt, r[1], 0x84, 0x6b, 0x20000000, 0x1c); syscall(__NR_write, r[1], 0x20000100, 0x1ede5); NONFAILING(memcpy((void*)0x20000180, "caif0\000\000\000\000\000\000\000\000\000\000\000", 16)); syscall(__NR_setsockopt, r[1], 1, 0x19, 0x20000180, 0x10); check_leaks(); return 0; }