/* alloc - Convenience routines for safely allocating memory * Copyright (C) 2007-2009 Josh Coalson * Copyright (C) 2011-2022 Xiph.Org Foundation * * 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. * * - Neither the name of the Xiph.org Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * 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 FOUNDATION 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. */ #ifndef FLAC__SHARE__ALLOC_H #define FLAC__SHARE__ALLOC_H #ifdef HAVE_CONFIG_H #include <config.h> #endif /* WATCHOUT: for c++ you may have to #define __STDC_LIMIT_MACROS 1 real early * before #including this file, otherwise SIZE_MAX might not be defined */ #include <limits.h> /* for SIZE_MAX */ #ifdef HAVE_STDINT_H #include <stdint.h> /* for SIZE_MAX in case limits.h didn't get it */ #endif #include <stdlib.h> /* for size_t, malloc(), etc */ #include "share/compat.h" #ifndef SIZE_MAX #ifndef SIZE_T_MAX #ifdef _MSC_VER #ifdef _WIN64 #define SIZE_T_MAX … #else #define SIZE_T_MAX … #endif #else #error #endif #endif #define SIZE_MAX … #endif #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION extern int alloc_check_threshold, alloc_check_counter; static inline int alloc_check() { if (alloc_check_threshold == INT32_MAX) { return 0; } else if (alloc_check_counter++ == alloc_check_threshold) { return 1; } else { return 0; } } #endif /* avoid malloc()ing 0 bytes, see: * https://www.securecoding.cert.org/confluence/display/seccode/MEM04-A.+Do+not+make+assumptions+about+the+result+of+allocating+0+bytes?focusedCommentId=5407003 */ static inline void* safe_malloc_(size_t size) { … } #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION static inline void* malloc_(size_t size) { /* Fail if requested */ if (alloc_check()) { return NULL; } return malloc(size); } #else #define malloc_ … #endif static inline void* safe_calloc_(size_t nmemb, size_t size) { … } /*@@@@ there's probably a better way to prevent overflows when allocating * untrusted sums but this works for now */ static inline void* safe_malloc_add_2op_(size_t size1, size_t size2) { … } static inline void* safe_malloc_add_3op_(size_t size1, size_t size2, size_t size3) { … } static inline void* safe_malloc_add_4op_(size_t size1, size_t size2, size_t size3, size_t size4) { … } void* safe_malloc_mul_2op_(size_t size1, size_t size2); static inline void* safe_malloc_mul_3op_(size_t size1, size_t size2, size_t size3) { … } /* size1*size2 + size3 */ static inline void* safe_malloc_mul2add_(size_t size1, size_t size2, size_t size3) { … } /* size1 * (size2 + size3) */ static inline void* safe_malloc_muladd2_(size_t size1, size_t size2, size_t size3) { … } static inline void* safe_realloc_(void* ptr, size_t size) { … } #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION static inline void* realloc_(void* ptr, size_t size) { /* Fail if requested */ if (alloc_check()) { return NULL; } return realloc(ptr, size); } #else #define realloc_ … #endif static inline void* safe_realloc_nofree_add_2op_(void* ptr, size_t size1, size_t size2) { … } static inline void* safe_realloc_add_3op_(void* ptr, size_t size1, size_t size2, size_t size3) { … } static inline void* safe_realloc_nofree_add_3op_(void* ptr, size_t size1, size_t size2, size_t size3) { … } static inline void* safe_realloc_nofree_add_4op_(void* ptr, size_t size1, size_t size2, size_t size3, size_t size4) { … } static inline void* safe_realloc_mul_2op_(void* ptr, size_t size1, size_t size2) { … } static inline void* safe_realloc_nofree_mul_2op_(void* ptr, size_t size1, size_t size2) { … } /* size1 * (size2 + size3) */ static inline void* safe_realloc_muladd2_(void* ptr, size_t size1, size_t size2, size_t size3) { … } /* size1 * (size2 + size3) */ static inline void* safe_realloc_nofree_muladd2_(void* ptr, size_t size1, size_t size2, size_t size3) { … } #endif
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