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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | /* * Copyright (c) 2022 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include "internal.h" #if MALLOC_TARGET_64BIT // Type Descriptor Layout // 0-31 | hash // 32-63 | summary // 32-33 | version // 34-37 | (unused) // 38-41 | callsite_flags // 38-40 | (enum values) // 41 | (unused enum bits) // 42-43 | type_kind // 42-43 | (enum values) // 44-47 | type_flags // 44-45 | (enum values) // 46-47 | (unused enum bits) // 48-63 | layout_semantics // 48 | data_pointer // 49 | struct_pointer // 50 | immutable_pointer // 51 | anonymous_pointer // 52 | reference_count // 53 | resource_handle // 54 | spatial_bounds // 55 | tainted_data // 56 | generic_data // 57-63 | (unused) // Enums sizes (required numbers of bits to encode enum) MALLOC_STATIC_ASSERT(MALLOC_TYPE_CALLSITE_FLAGS_HEADER_PREFIXED_ARRAY < (1 << 3), "malloc_type_callsite_flags_t size"); MALLOC_STATIC_ASSERT(MALLOC_TYPE_KIND_CXX < (1 << 2), "malloc_type_kind_t size"); MALLOC_STATIC_ASSERT(MALLOC_TYPE_FLAGS_HAS_MIXED_UNIONS < (1 << 2), "malloc_type_flags_t size"); // Struct sizes MALLOC_STATIC_ASSERT(sizeof(malloc_type_layout_semantics_t) == 2, "malloc_type_layout_semantics_t size"); MALLOC_STATIC_ASSERT(sizeof(malloc_type_summary_t) == 4, "malloc_type_summary_t size"); MALLOC_STATIC_ASSERT(sizeof(malloc_type_descriptor_t) == 8, "malloc_type_descriptor_t size"); // Type descriptor union MALLOC_STATIC_ASSERT(sizeof(malloc_type_descriptor_t) == sizeof(malloc_type_id_t), "same size as malloc_type_id_t"); MALLOC_STATIC_ASSERT(sizeof(malloc_type_descriptor_t) == sizeof(void *), "same size as malloc_type_id_t"); extern void *_malloc_text_start __asm("segment$start$__TEXT"); extern void *_malloc_text_end __asm("segment$end$__TEXT"); static bool _malloc_symbol_interposed(void *symbol) { #if __has_feature(ptrauth_calls) symbol = ptrauth_strip(symbol, ptrauth_key_function_pointer); #endif uintptr_t symbol_addr = (uintptr_t)symbol; uintptr_t malloc_start_addr = (uintptr_t)&_malloc_text_start; uintptr_t malloc_end_addr = (uintptr_t)&_malloc_text_end; return symbol_addr < malloc_start_addr || symbol_addr >= malloc_end_addr; } void _malloc_detect_interposition(void) { bool non_typed_symbols_interposed = _malloc_symbol_interposed(malloc) || _malloc_symbol_interposed(calloc) || _malloc_symbol_interposed(free) || _malloc_symbol_interposed(realloc) || _malloc_symbol_interposed(valloc) || _malloc_symbol_interposed(aligned_alloc) || _malloc_symbol_interposed(posix_memalign) || _malloc_symbol_interposed(malloc_zone_malloc) || _malloc_symbol_interposed(malloc_zone_calloc) || _malloc_symbol_interposed(malloc_zone_free) || _malloc_symbol_interposed(malloc_zone_realloc) || _malloc_symbol_interposed(malloc_zone_valloc) || _malloc_symbol_interposed(malloc_zone_memalign); bool typed_symbols_interposed = _malloc_symbol_interposed(malloc_type_malloc) || _malloc_symbol_interposed(malloc_type_calloc) || _malloc_symbol_interposed(malloc_type_free) || _malloc_symbol_interposed(malloc_type_realloc) || _malloc_symbol_interposed(malloc_type_valloc) || _malloc_symbol_interposed(malloc_type_aligned_alloc) || _malloc_symbol_interposed(malloc_type_posix_memalign) || _malloc_symbol_interposed(malloc_type_zone_malloc) || _malloc_symbol_interposed(malloc_type_zone_calloc) || _malloc_symbol_interposed(malloc_type_zone_free) || _malloc_symbol_interposed(malloc_type_zone_realloc) || _malloc_symbol_interposed(malloc_type_zone_valloc) || _malloc_symbol_interposed(malloc_type_zone_memalign); bool interposition_compat = non_typed_symbols_interposed && !typed_symbols_interposed; if (malloc_interposition_compat != interposition_compat) { malloc_interposition_compat = interposition_compat; } } #else // MALLOC_TARGET_64BIT void _malloc_detect_interposition(void) { // No compatibility support required } #endif // MALLOC_TARGET_64BIT |