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[MTE] do not show notification for persistent MTE

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Depends on https://r.android.com/2224809, but does not harm
(but doesn't work) if submitted earlier.

Test: mte on in bootloader, boot, no notification
Change-Id: Id1e6903d658e5fc83caea2710b4ae7559e455cce
This commit is contained in:
Florian Mayer
2022-09-30 16:30:21 -07:00
parent 14ae6ce1e6
commit b32d842687
1 changed files with 8 additions and 1 deletions
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9
services/core/java/com/android/server/am/ActivityManagerService.java
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@@ -5329,7 +5329,14 @@ public class ActivityManagerService extends IActivityManager.Stub
}
private void showMteOverrideNotificationIfActive() {
if (!SystemProperties.getBoolean("ro.arm64.memtag.bootctl_supported", false)
String bootctl = SystemProperties.get("arm64.memtag.bootctl");
// If MTE is on, there is one in three cases:
// * a fullmte build: ro.arm64.memtag.bootctl_supported is not set
// * memtag: arm64.memtag.bootctl contains "memtag"
// * memtag-once
// In the condition below we detect memtag-once by exclusion.
if (Arrays.asList(bootctl.split(",")).contains("memtag")
|| !SystemProperties.getBoolean("ro.arm64.memtag.bootctl_supported", false)
|| !com.android.internal.os.Zygote.nativeSupportsMemoryTagging()) {
return;
}