64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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* http://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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*/
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#include "AshmemMapper.h"
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#include <inttypes.h>
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#include <log/log.h>
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#include <sys/mman.h>
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#include "AshmemMemory.h"
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namespace android {
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namespace hidl {
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namespace memory {
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namespace V1_0 {
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namespace implementation {
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// Methods from ::android::hidl::memory::V1_0::IMapper follow.
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Return<sp<IMemory>> AshmemMapper::mapMemory(const hidl_memory& mem) {
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if (mem.handle()->numFds == 0) {
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return nullptr;
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}
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// If ashmem service runs in 32-bit (size_t is uint32_t) and a 64-bit
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// client process requests a memory > 2^32 bytes, the size would be
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// converted to a 32-bit number in mmap. mmap could succeed but the
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// mapped memory's actual size would be smaller than the reported size.
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if (mem.size() > SIZE_MAX) {
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ALOGE("Cannot map %" PRIu64 " bytes of memory because it is too large.", mem.size());
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android_errorWriteLog(0x534e4554, "79376389");
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return nullptr;
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}
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int fd = mem.handle()->data[0];
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void* data = mmap(0, mem.size(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (data == MAP_FAILED) {
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// mmap never maps at address zero without MAP_FIXED, so we can avoid
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// exposing clients to MAP_FAILED.
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return nullptr;
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}
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return new AshmemMemory(mem, data);
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}
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} // namespace implementation
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} // namespace V1_0
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} // namespace memory
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} // namespace hidl
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} // namespace android
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