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Merge "[RESTRICT AUTOMERGE] Fix CryptoPlugin use after free vulnerability." into oc-mr1-dev

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This commit is contained in:
Edwin Wong
2021-04-06 22:27:14 +00:00
committed by Android (Google) Code Review
parent d468101f14 7e4c587ae3
commit c73a52277f
3 changed files with 21 additions and 10 deletions
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3
drm/1.0/default/Android.bp
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@@ -9,6 +9,7 @@ cc_library_static {
"-Werror", "-Werror",
"-Wextra", "-Wextra",
"-Wall", "-Wall",
"-Wthread-safety",
], ],
shared_libs: [ shared_libs: [
"liblog", "liblog",
@@ -19,5 +20,5 @@ cc_library_static {
export_header_lib_headers: [ export_header_lib_headers: [
"libutils_headers", "libutils_headers",
], ],
export_include_dirs : ["include"] export_include_dirs: ["include"],
} }

7
drm/1.0/default/CryptoPlugin.cpp
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@@ -54,6 +54,8 @@ namespace implementation {
sp<IMemory> hidlMemory = mapMemory(base); sp<IMemory> hidlMemory = mapMemory(base);
ALOGE_IF(hidlMemory == nullptr, "mapMemory returns nullptr"); ALOGE_IF(hidlMemory == nullptr, "mapMemory returns nullptr");
std::unique_lock<std::mutex> lock(mSharedBufferLock);
// allow mapMemory to return nullptr // allow mapMemory to return nullptr
mSharedBufferMap[bufferId] = hidlMemory; mSharedBufferMap[bufferId] = hidlMemory;
return Void(); return Void();
@@ -66,7 +68,7 @@ namespace implementation {
const SharedBuffer& source, uint64_t offset, const SharedBuffer& source, uint64_t offset,
const DestinationBuffer& destination, const DestinationBuffer& destination,
decrypt_cb _hidl_cb) { decrypt_cb _hidl_cb) {
std::unique_lock<std::mutex> lock(mSharedBufferLock);
if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) { if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set"); _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set");
return Void(); return Void();
@@ -179,6 +181,9 @@ namespace implementation {
_hidl_cb(Status::BAD_VALUE, 0, "invalid destination type"); _hidl_cb(Status::BAD_VALUE, 0, "invalid destination type");
return Void(); return Void();
} }
// release mSharedBufferLock
lock.unlock();
ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(), ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(),
legacyMode, legacyPattern, srcPtr, legacySubSamples, legacyMode, legacyPattern, srcPtr, legacySubSamples,
subSamples.size(), destPtr, &detailMessage); subSamples.size(), destPtr, &detailMessage);

21
drm/1.0/default/CryptoPlugin.h
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@@ -17,11 +17,14 @@
#ifndef ANDROID_HARDWARE_DRM_V1_0__CRYPTOPLUGIN_H #ifndef ANDROID_HARDWARE_DRM_V1_0__CRYPTOPLUGIN_H
#define ANDROID_HARDWARE_DRM_V1_0__CRYPTOPLUGIN_H #define ANDROID_HARDWARE_DRM_V1_0__CRYPTOPLUGIN_H
#include <android/hidl/memory/1.0/IMemory.h> #include <android-base/thread_annotations.h>
#include <android/hardware/drm/1.0/ICryptoPlugin.h> #include <android/hardware/drm/1.0/ICryptoPlugin.h>
#include <android/hidl/memory/1.0/IMemory.h>
#include <hidl/Status.h> #include <hidl/Status.h>
#include <media/hardware/CryptoAPI.h> #include <media/hardware/CryptoAPI.h>
#include <mutex>
namespace android { namespace android {
namespace hardware { namespace hardware {
namespace drm { namespace drm {
@@ -60,19 +63,21 @@ struct CryptoPlugin : public ICryptoPlugin {
Return<void> setSharedBufferBase(const ::android::hardware::hidl_memory& base, Return<void> setSharedBufferBase(const ::android::hardware::hidl_memory& base,
uint32_t bufferId) override; uint32_t bufferId) override;
Return<void> decrypt(bool secure, const hidl_array<uint8_t, 16>& keyId, Return<void> decrypt(
const hidl_array<uint8_t, 16>& iv, Mode mode, const Pattern& pattern, bool secure, const hidl_array<uint8_t, 16>& keyId, const hidl_array<uint8_t, 16>& iv,
const hidl_vec<SubSample>& subSamples, const SharedBuffer& source, Mode mode, const Pattern& pattern, const hidl_vec<SubSample>& subSamples,
uint64_t offset, const DestinationBuffer& destination, const SharedBuffer& source, uint64_t offset, const DestinationBuffer& destination,
decrypt_cb _hidl_cb) override; decrypt_cb _hidl_cb) override NO_THREAD_SAFETY_ANALYSIS; // use unique_lock
private: private:
android::CryptoPlugin *mLegacyPlugin; android::CryptoPlugin *mLegacyPlugin;
std::map<uint32_t, sp<IMemory> > mSharedBufferMap; std::map<uint32_t, sp<IMemory>> mSharedBufferMap GUARDED_BY(mSharedBufferLock);
CryptoPlugin() = delete; CryptoPlugin() = delete;
CryptoPlugin(const CryptoPlugin &) = delete; CryptoPlugin(const CryptoPlugin &) = delete;
void operator=(const CryptoPlugin &) = delete; void operator=(const CryptoPlugin &) = delete;
std::mutex mSharedBufferLock;
}; };
} // namespace implementation } // namespace implementation