86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <poll.h> // For struct pollfd.
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#include <stdarg.h>
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#include <stdlib.h>
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#include <sys/select.h> // For struct fd_set.
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#include <async_safe/log.h>
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//
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// LLVM can't inline variadic functions, and we don't want one definition of
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// this per #include in libc.so, so no `static`.
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//
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inline __noreturn __printflike(1, 2) void __fortify_fatal(const char* fmt, ...) {
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va_list args;
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va_start(args, fmt);
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async_safe_fatal_va_list("FORTIFY", fmt, args);
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va_end(args);
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abort();
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}
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//
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// Common helpers.
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//
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static inline void __check_fd_set(const char* fn, int fd, size_t set_size) {
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if (__predict_false(fd < 0)) {
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__fortify_fatal("%s: file descriptor %d < 0", fn, fd);
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}
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if (__predict_false(fd >= FD_SETSIZE)) {
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__fortify_fatal("%s: file descriptor %d >= FD_SETSIZE %d", fn, fd, FD_SETSIZE);
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}
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if (__predict_false(set_size < sizeof(fd_set))) {
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__fortify_fatal("%s: set size %zu is too small to be an fd_set", fn, set_size);
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}
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}
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static inline void __check_pollfd_array(const char* fn, size_t fds_size, nfds_t fd_count) {
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size_t pollfd_array_length = fds_size / sizeof(pollfd);
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if (__predict_false(pollfd_array_length < fd_count)) {
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__fortify_fatal("%s: %zu-element pollfd array too small for %u fds",
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fn, pollfd_array_length, fd_count);
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}
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}
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static inline void __check_count(const char* fn, const char* identifier, size_t value) {
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if (__predict_false(value > SSIZE_MAX)) {
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__fortify_fatal("%s: %s %zu > SSIZE_MAX", fn, identifier, value);
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}
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}
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static inline void __check_buffer_access(const char* fn, const char* action,
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size_t claim, size_t actual) {
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if (__predict_false(claim > actual)) {
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__fortify_fatal("%s: prevented %zu-byte %s %zu-byte buffer", fn, claim, action, actual);
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}
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}
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