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a9268d5f4b
Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1914 ``` : warning: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Wsign-conversion] 50 | return getpagesize(); | ~~~~~~ ^~~~~~~~~~~~~ ../_deps/absl-src/absl/base/internal/poison.cc:79:29: error: use of undeclared identifier 'data' 79 | return static_cast<char*>(data) + block_size / 2; | ^ 1 warning and 1 error generated. gmake[2]: *** [_deps/absl-build/absl/base/CMakeFiles/poison.dir/build.make:76: _deps/absl-build/absl/base/CMakeFiles/poison.dir/internal/poison.cc.obj] Error 1 gmake[1]: *** [CMakeFiles/Makefile2:1843: _deps/absl-build/absl/base/CMakeFiles/poison.dir/all] Error 2 gmake: *** [Makefile:136: all] Error 2 ``` Merge6b172a21d1into785b11b33fMerging this change closes #1914 COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1914 from Ricardicus:master6b172a21d1PiperOrigin-RevId: 788985640 Change-Id: Ife849052c340985d08a4dda131dad086e670d901
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Copyright 2024 The Abseil Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/base/internal/poison.h"
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#include <cstdlib>
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#include "absl/base/config.h"
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#include "absl/base/internal/direct_mmap.h"
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#ifndef _WIN32
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#include <unistd.h>
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#endif
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#if defined(ABSL_HAVE_ADDRESS_SANITIZER)
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#include <sanitizer/asan_interface.h>
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#elif defined(ABSL_HAVE_MEMORY_SANITIZER)
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#include <sanitizer/msan_interface.h>
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#elif defined(ABSL_HAVE_MMAP)
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#include <sys/mman.h>
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#endif
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#if defined(_WIN32)
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#include <windows.h>
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#endif
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace base_internal {
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namespace {
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size_t GetPageSize() {
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#ifdef _WIN32
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SYSTEM_INFO system_info;
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GetSystemInfo(&system_info);
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return system_info.dwPageSize;
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#elif defined(__wasm__) || defined(__asmjs__) || defined(__hexagon__)
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return getpagesize();
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#else
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return static_cast<size_t>(sysconf(_SC_PAGESIZE));
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#endif
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}
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} // namespace
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void* InitializePoisonedPointerInternal() {
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const size_t block_size = GetPageSize();
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void* data = nullptr;
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#if defined(ABSL_HAVE_ADDRESS_SANITIZER)
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data = malloc(block_size);
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ASAN_POISON_MEMORY_REGION(data, block_size);
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#elif defined(ABSL_HAVE_MEMORY_SANITIZER)
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data = malloc(block_size);
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__msan_poison(data, block_size);
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#elif defined(ABSL_HAVE_MMAP)
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data = DirectMmap(nullptr, block_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS,
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-1, 0);
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if (data == MAP_FAILED) return GetBadPointerInternal();
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#elif defined(_WIN32)
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data = VirtualAlloc(nullptr, block_size, MEM_RESERVE | MEM_COMMIT,
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PAGE_NOACCESS);
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if (data == nullptr) return GetBadPointerInternal();
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#else
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return GetBadPointerInternal();
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#endif
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// Return the middle of the block so that dereferences before and after the
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// pointer will both crash.
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return static_cast<char*>(data) + block_size / 2;
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}
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} // namespace base_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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