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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/gwp_asan/client/guarded_page_allocator.h"
#include <sys/mman.h>
#include <ostream>
#include "base/check.h"
#include "base/posix/eintr_wrapper.h"
namespace gwp_asan {
namespace internal {
void* GuardedPageAllocator::MapRegion() {
return mmap(MapRegionHint(), RegionSize(), PROT_NONE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
}
void GuardedPageAllocator::UnmapRegion() {
CHECK(state_.pages_base_addr);
[[maybe_unused]] int err =
munmap(reinterpret_cast<void*>(state_.pages_base_addr), RegionSize());
DPCHECK(err == 0) << "munmap";
}
void GuardedPageAllocator::MarkPageReadWrite(void* ptr) {
int err =
HANDLE_EINTR(mprotect(ptr, state_.page_size, PROT_READ | PROT_WRITE));
PCHECK(err == 0) << "mprotect";
}
void GuardedPageAllocator::MarkPageInaccessible(void* ptr) {
// mmap() a PROT_NONE page over the address to release it to the system, if
// we used mprotect() here the system would count pages in the quarantine
// against the RSS.
void* err = mmap(ptr, state_.page_size, PROT_NONE,
MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
PCHECK(err == ptr) << "mmap";
}
} // namespace internal
} // namespace gwp_asan
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