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139 lines
6.2 KiB
Diff
139 lines
6.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Sally Qi <sallyqi@google.com>
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Date: Wed, 5 Oct 2022 11:42:30 -0700
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Subject: [PATCH] Mitigate the security vulnerability by sanitizing the
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transaction flags.
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- This is part of fix of commit
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Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df for backporting.
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- Part of commit Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df which
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sanitizes the transaction flags from DisplayState instead.
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- In rvc, we only have ACCESS_SURFACE_FLINGER permission check passed as
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`privileged` argument in SF::applyTransactionState. We can directly
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utilize it for sanitization in DiaplyState.
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- In rvc code base, SF::setTransactionState pass a const array of
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displayState objects and then call SF::applyTransactionState. To
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successfully sanitize the flags for each displayState object, we
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convert this const array into non-const one before calling
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SF::applyTransactionState.
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Bug: 248031255
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Test: test using displaytoken app manually on the phone, test shell
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screenrecord during using displaytoken; atest
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android.hardware.camera2.cts.FastBasicsTest
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Change-Id: Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df
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Merged-In: Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df
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(cherry picked from commit 03d4458ea0cb00c28f695d99aae5e4c6b15fc237)
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Merged-In: Id9d9012d4ede9c8330f0ce1096bcb78e51b7c5df
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---
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libs/gui/LayerState.cpp | 21 +++++++++++++++++++++
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libs/gui/include/gui/LayerState.h | 1 +
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services/surfaceflinger/SurfaceFlinger.cpp | 14 ++++++++++----
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services/surfaceflinger/SurfaceFlinger.h | 5 ++---
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4 files changed, 34 insertions(+), 7 deletions(-)
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diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
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index 6066421faf..293f042de2 100644
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--- a/libs/gui/LayerState.cpp
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+++ b/libs/gui/LayerState.cpp
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@@ -237,6 +237,27 @@ void DisplayState::merge(const DisplayState& other) {
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}
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}
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+void DisplayState::sanitize(bool privileged) {
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+ if (what & DisplayState::eLayerStackChanged) {
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+ if (!privileged) {
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+ what &= ~DisplayState::eLayerStackChanged;
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+ ALOGE("Stripped attempt to set eLayerStackChanged in sanitize");
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+ }
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+ }
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+ if (what & DisplayState::eDisplayProjectionChanged) {
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+ if (!privileged) {
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+ what &= ~DisplayState::eDisplayProjectionChanged;
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+ ALOGE("Stripped attempt to set eDisplayProjectionChanged in sanitize");
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+ }
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+ }
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+ if (what & DisplayState::eSurfaceChanged) {
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+ if (!privileged) {
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+ what &= ~DisplayState::eSurfaceChanged;
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+ ALOGE("Stripped attempt to set eSurfaceChanged in sanitize");
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+ }
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+ }
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+}
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+
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void layer_state_t::merge(const layer_state_t& other) {
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if (other.what & ePositionChanged) {
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what |= ePositionChanged;
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diff --git a/libs/gui/include/gui/LayerState.h b/libs/gui/include/gui/LayerState.h
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index f438eb3d01..8a07602e41 100644
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--- a/libs/gui/include/gui/LayerState.h
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+++ b/libs/gui/include/gui/LayerState.h
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@@ -231,6 +231,7 @@ struct DisplayState {
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DisplayState();
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void merge(const DisplayState& other);
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+ void sanitize(bool privileged);
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uint32_t what;
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sp<IBinder> token;
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diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
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index db26808cc2..21e9e8eb96 100644
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--- a/services/surfaceflinger/SurfaceFlinger.cpp
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+++ b/services/surfaceflinger/SurfaceFlinger.cpp
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@@ -3675,7 +3675,7 @@ bool SurfaceFlinger::flushTransactionQueues() {
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auto& [applyToken, transactionQueue] = *it;
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while (!transactionQueue.empty()) {
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- const auto& transaction = transactionQueue.front();
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+ auto& transaction = transactionQueue.front();
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if (!transactionIsReadyToBeApplied(transaction.desiredPresentTime,
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transaction.states)) {
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setTransactionFlags(eTransactionFlushNeeded);
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@@ -3794,12 +3794,17 @@ void SurfaceFlinger::setTransactionState(const Vector<ComposerState>& states,
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return;
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}
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- applyTransactionState(states, displays, flags, inputWindowCommands, desiredPresentTime,
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+ Vector<DisplayState> displaysList;
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+ for (auto& d : displays) {
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+ displaysList.add(d);
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+ }
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+
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+ applyTransactionState(states, displaysList, flags, inputWindowCommands, desiredPresentTime,
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uncacheBuffer, listenerCallbacks, postTime, privileged);
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}
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void SurfaceFlinger::applyTransactionState(const Vector<ComposerState>& states,
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- const Vector<DisplayState>& displays, uint32_t flags,
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+ Vector<DisplayState>& displays, uint32_t flags,
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const InputWindowCommands& inputWindowCommands,
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const int64_t desiredPresentTime,
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const client_cache_t& uncacheBuffer,
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@@ -3824,7 +3829,8 @@ void SurfaceFlinger::applyTransactionState(const Vector<ComposerState>& states,
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}
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}
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- for (const DisplayState& display : displays) {
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+ for (DisplayState& display : displays) {
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+ display.sanitize(privileged);
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transactionFlags |= setDisplayStateLocked(display);
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}
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diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
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index e58caa63b3..c4578d0dbb 100644
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--- a/services/surfaceflinger/SurfaceFlinger.h
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+++ b/services/surfaceflinger/SurfaceFlinger.h
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@@ -568,9 +568,8 @@ private:
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/* ------------------------------------------------------------------------
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* Transactions
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*/
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- void applyTransactionState(const Vector<ComposerState>& state,
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- const Vector<DisplayState>& displays, uint32_t flags,
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- const InputWindowCommands& inputWindowCommands,
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+ void applyTransactionState(const Vector<ComposerState>& state, Vector<DisplayState>& displays,
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+ uint32_t flags, const InputWindowCommands& inputWindowCommands,
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const int64_t desiredPresentTime,
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const client_cache_t& uncacheBuffer,
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const std::vector<ListenerCallbacks>& listenerCallbacks,
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