From 7bea563b87604140f4501d8e57d2b0daf254539e Mon Sep 17 00:00:00 2001
From: Makoto Onuki <omakoto@google.com>
Date: Fri, 7 Jan 2022 10:18:00 -0800
Subject: [PATCH] Do not trigger a disk write violation during dumpsys gfxinfo

Writing to a pipe FD here is okay because it doesn't write to
the physical disk.

Bug: 203682422
Test: dumpsys gfxinfo
Change-Id: Ibb484f0d466d13e55d2c8059a5af964641281110
---
 core/java/android/app/ActivityThread.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index 1778ea4a32e23..b2c9439d57600 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -4645,12 +4645,14 @@ public final class ActivityThread extends ClientTransactionHandler
     }
 
     private void handleDumpGfxInfo(DumpComponentInfo info) {
+        final StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskWrites();
         try {
             ThreadedRenderer.handleDumpGfxInfo(info.fd.getFileDescriptor(), info.args);
         } catch (Exception e) {
             Log.w(TAG, "Caught exception from dumpGfxInfo()", e);
         } finally {
             IoUtils.closeQuietly(info.fd);
+            StrictMode.setThreadPolicy(oldPolicy);
         }
     }