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lib/libc/secure/__fread_chk.c
- This file was added.
| /*- | |||||
| * Copyright (C) 2015 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. | |||||
| * | |||||
| * bionic rev: fed2659869ec41a93f655be8058568ddab419e01 | |||||
| * | |||||
| * $FreeBSD$ | |||||
| */ | |||||
| #undef _FORTIFY_SOURCE | |||||
| #include <sys/cdefs.h> | |||||
| #include <secure/security.h> | |||||
| #include <stdio.h> | |||||
| #include "secure/_stdio.h" | |||||
| size_t | |||||
| __fread_chk(void *__restrict ptr, size_t size, size_t nmemb, FILE * __restrict stream, size_t bos) | |||||
| { | |||||
| size_t total; | |||||
| if (__predict_false(bos == __FORTIFY_UNKNOWN_SIZE)) | |||||
| return (fread(ptr, size, nmemb, stream)); | |||||
| if (__predict_false(__size_mul_overflow(size, nmemb, &total))) { | |||||
| //overflow: trigger the error path in fread | |||||
| return (fread(ptr, size, nmemb, stream)); | |||||
| } | |||||
| if (__predict_false(total > bos)) | |||||
| __fortify_chk_fail("fread: prevented write past end of buffer"); | |||||
| return (fread(ptr, size, nmemb, stream)); | |||||
| } | |||||