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/*
* 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>
//
// LLVM can't inline variadic functions, and we don't want one definition of
// this per #include in libc.so, so no `static`.
//
inline __noreturn __printflike(1, 2) 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 %d", 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);
}
}
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