libui: harden GraphicBufferMapper::importBuffer

Add support for validateBufferSize and getTransportSize from IMapper
2.1.  Update GraphicBufferMapper::importBuffer to validate buffer
size, and update GraphicBuffer::flatten to use the handle transport
size.

This fixes two issues with GraphicBuffer.  Pointers returned by
lock/lockYCbCr can now be accessed without potential OOB.  flatten
no longer includes process-local runtime data.

Bug: 62535446
Bug: 62084097
Bug: 32587089
Test: manual
Change-Id: Ice13af26b84f25e43089637e9d67e3ad820e22ed

1 files changed, 29 insertions, 4 deletions

diff --git a/libs/ui/GraphicBufferMapper.cpp b/libs/ui/GraphicBufferMapper.cpp
index 163432821f..672dc361a1 100644
--- a/libs/ui/GraphicBufferMapper.cpp
+++ b/libs/ui/GraphicBufferMapper.cpp
@@ -52,17 +52,42 @@ GraphicBufferMapper::GraphicBufferMapper()
 }
 
 status_t GraphicBufferMapper::importBuffer(buffer_handle_t rawHandle,
+        uint32_t width, uint32_t height, uint32_t layerCount,
+        PixelFormat format, uint64_t usage, uint32_t stride,
         buffer_handle_t* outHandle)
 {
     ATRACE_CALL();
 
+    buffer_handle_t bufferHandle;
     Gralloc2::Error error = mMapper->importBuffer(
-            hardware::hidl_handle(rawHandle), outHandle);
+            hardware::hidl_handle(rawHandle), &bufferHandle);
+    if (error != Gralloc2::Error::NONE) {
+        ALOGW("importBuffer(%p) failed: %d", rawHandle, error);
+        return static_cast<status_t>(error);
+    }
+
+    Gralloc2::IMapper::BufferDescriptorInfo info = {};
+    info.width = width;
+    info.height = height;
+    info.layerCount = layerCount;
+    info.format = static_cast<Gralloc2::PixelFormat>(format);
+    info.usage = usage;
+    error = mMapper->validateBufferSize(bufferHandle, info, stride);
+    if (error != Gralloc2::Error::NONE) {
+        ALOGE("validateBufferSize(%p) failed: %d", rawHandle, error);
+        freeBuffer(bufferHandle);
+        return static_cast<status_t>(error);
+    }
 
-    ALOGW_IF(error != Gralloc2::Error::NONE, "importBuffer(%p) failed: %d",
-            rawHandle, error);
+    *outHandle = bufferHandle;
 
-    return static_cast<status_t>(error);
+    return NO_ERROR;
+}
+
+void GraphicBufferMapper::getTransportSize(buffer_handle_t handle,
+            uint32_t* outTransportNumFds, uint32_t* outTransportNumInts)
+{
+    mMapper->getTransportSize(handle, outTransportNumFds, outTransportNumInts);
 }
 
 status_t GraphicBufferMapper::freeBuffer(buffer_handle_t handle)