| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <poll.h> // For struct pollfd. |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <sys/select.h> // For struct fd_set. |
| |
| #include <async_safe/log.h> |
| |
| static inline __noreturn void __fortify_fatal(const char* fmt, ...) { |
| va_list args; |
| va_start(args, fmt); |
| async_safe_fatal_va_list("FORTIFY", fmt, args); |
| va_end(args); |
| abort(); |
| } |
| |
| // |
| // Common helpers. |
| // |
| |
| static inline void __check_fd_set(const char* fn, int fd, size_t set_size) { |
| if (__predict_false(fd < 0)) { |
| __fortify_fatal("%s: file descriptor %d < 0", fn, fd); |
| } |
| if (__predict_false(fd >= FD_SETSIZE)) { |
| __fortify_fatal("%s: file descriptor %d >= FD_SETSIZE %zu", fn, fd, FD_SETSIZE); |
| } |
| if (__predict_false(set_size < sizeof(fd_set))) { |
| __fortify_fatal("%s: set size %zu is too small to be an fd_set", fn, set_size); |
| } |
| } |
| |
| static inline void __check_pollfd_array(const char* fn, size_t fds_size, nfds_t fd_count) { |
| size_t pollfd_array_length = fds_size / sizeof(pollfd); |
| if (__predict_false(pollfd_array_length < fd_count)) { |
| __fortify_fatal("%s: %zu-element pollfd array too small for %u fds", |
| fn, pollfd_array_length, fd_count); |
| } |
| } |
| |
| static inline void __check_count(const char* fn, const char* identifier, size_t value) { |
| if (__predict_false(value > SSIZE_MAX)) { |
| __fortify_fatal("%s: %s %zu > SSIZE_MAX", fn, identifier, value); |
| } |
| } |
| |
| static inline void __check_buffer_access(const char* fn, const char* action, |
| size_t claim, size_t actual) { |
| if (__predict_false(claim > actual)) { |
| __fortify_fatal("%s: prevented %zu-byte %s %zu-byte buffer", fn, claim, action, actual); |
| } |
| } |