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Commit 75ab8ce3 authored by Mitch Phillips's avatar Mitch Phillips Committed by Automerger Merge Worker
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Merge "[MTE] Add SYNC compat feature & disable for system apps." am:... 

Merge "[MTE] Add SYNC compat feature & disable for system apps." am: 284195e7 am: 6d521a4b am: 493aea74

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1548867

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I26428109fd75ab0ea2bf6091970949e3daa11d84
parents 8a65eef5 493aea74

services/core/java/com/android/server/am/ProcessList.java

+26 −14
Original line number Diff line number Diff line
@@ -340,12 +340,23 @@ public final class ProcessList { 
    private static final long NATIVE_HEAP_POINTER_TAGGING = 135754954; // This is a bug id.



    /**

     * Enable memory tag checks in non-system apps. This flag will only have an effect on

     * hardware supporting the ARM Memory Tagging Extension (MTE).

     * Enable asynchronous (ASYNC) memory tag checking in this process. This

     * flag will only have an effect on hardware supporting the ARM Memory

     * Tagging Extension (MTE).

     */

    @ChangeId

    @Disabled

    private static final long NATIVE_MEMORY_TAGGING = 135772972; // This is a bug id.

    private static final long NATIVE_MEMTAG_ASYNC = 135772972; // This is a bug id.



    /**

     * Enable synchronous (SYNC) memory tag checking in this process. This flag

     * will only have an effect on hardware supporting the ARM Memory Tagging

     * Extension (MTE). If both NATIVE_MEMTAG_ASYNC and this option is selected,

     * this option takes preference and MTE is enabled in SYNC mode.

     */

    @ChangeId

    @Disabled

    private static final long NATIVE_MEMTAG_SYNC = 177438394; // This is a bug id.



    /**

     * Enable sampled memory bug detection in the app.
@@ -1655,23 +1666,23 @@ public final class ProcessList { 
        return gidArray;

    }



    private boolean shouldEnableMemoryTagging(ProcessRecord app) {

    // Returns the memory tagging level to be enabled. If memory tagging isn't

    // requested, returns zero.

    private int getMemtagLevel(ProcessRecord app) {

        // Ensure the hardware + kernel actually supports MTE.

        if (!Zygote.nativeSupportsMemoryTagging()) {

            return false;

            return 0;

        }



        // Enable MTE for system apps if supported.

        if ((app.info.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {

            return true;

        if (mPlatformCompat.isChangeEnabled(NATIVE_MEMTAG_SYNC, app.info)) {

            return Zygote.MEMORY_TAG_LEVEL_SYNC;

        }



        // Enable MTE if the compat feature is enabled.

        if (mPlatformCompat.isChangeEnabled(NATIVE_MEMORY_TAGGING, app.info)) {

            return true;

        if (mPlatformCompat.isChangeEnabled(NATIVE_MEMTAG_ASYNC, app.info)) {

            return Zygote.MEMORY_TAG_LEVEL_ASYNC;

        }



        return false;

        return 0;

    }



    private boolean shouldEnableTaggedPointers(ProcessRecord app) {
@@ -1695,8 +1706,9 @@ public final class ProcessList { 


    private int decideTaggingLevel(ProcessRecord app) {

        // Check MTE support first, as it should take precedence over TBI.

        if (shouldEnableMemoryTagging(app)) {

            return Zygote.MEMORY_TAG_LEVEL_ASYNC;

        int memtagLevel = getMemtagLevel(app);

        if (memtagLevel != 0) {

            return memtagLevel;

        }



        if (shouldEnableTaggedPointers(app)) {