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Replace ReadOnlySharedMemoryRegion with WritableSharedMemoryRegion (see #3502)

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Write access to the shared memory region is required because JavaScript lacks
the capability to create read-only ArrayBuffers. When a user attempts to modify
an ArrayBuffer that utilizes a ReadOnlySharedMemoryRegion as its BackingStore
it triggers an access violation.

Note that this pull request may be reverted in the future if JavaScript adds
read-only ArrayBuffer support.
This commit is contained in:
Nik Pavlov
2023-10-16 22:43:29 +00:00
committed by Marshall Greenblatt
parent f3e92b45fc
commit 8d7001adc3
16 changed files with 81 additions and 42 deletions
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11
libcef/common/process_message_smr_impl.h
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@ -9,12 +9,12 @@
#include "include/cef_process_message.h"
#include "include/cef_shared_process_message_builder.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/writable_shared_memory_region.h"
class CefProcessMessageSMRImpl final : public CefProcessMessage {
public:
CefProcessMessageSMRImpl(const CefString& name,
base::ReadOnlySharedMemoryRegion&& region);
base::WritableSharedMemoryRegion&& region);
CefProcessMessageSMRImpl(const CefProcessMessageSMRImpl&) = delete;
CefProcessMessageSMRImpl& operator=(const CefProcessMessageSMRImpl&) = delete;
~CefProcessMessageSMRImpl() override;
@ -26,11 +26,11 @@ class CefProcessMessageSMRImpl final : public CefProcessMessage {
CefString GetName() override;
CefRefPtr<CefListValue> GetArgumentList() override { return nullptr; }
CefRefPtr<CefSharedMemoryRegion> GetSharedMemoryRegion() override;
[[nodiscard]] base::ReadOnlySharedMemoryRegion TakeRegion();
[[nodiscard]] base::WritableSharedMemoryRegion TakeRegion();
private:
const CefString name_;
base::ReadOnlySharedMemoryRegion region_;
base::WritableSharedMemoryRegion region_;
IMPLEMENT_REFCOUNTING(CefProcessMessageSMRImpl);
};
@ -50,7 +50,8 @@ class CefSharedProcessMessageBuilderImpl final
private:
const CefString name_;
base::MappedReadOnlyRegion region_;
base::WritableSharedMemoryRegion region_;
base::WritableSharedMemoryMapping mapping_;
IMPLEMENT_REFCOUNTING(CefSharedProcessMessageBuilderImpl);
};