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39 lines
1.5 KiB
Diff
39 lines
1.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Brian Delwiche <delwiche@google.com>
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Date: Thu, 5 Oct 2023 00:01:03 +0000
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Subject: [PATCH] Fix UAF in ~CallbackEnv
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com_android_bluetooth_btservice_AdapterService does not null its local
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JNI environment variable after detaching the thread (which frees the
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environment context), allowing UAF under certain conditions.
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Null the variable in this case.
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Testing here was done through a custom unit test; see patchsets 4-6 for
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contents. However, unit testing of the JNI layer is problematic in
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production, so that part of the patch is omitted for final merge.
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Bug: 291500341
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Test: atest bluetooth_test_gd_unit, atest net_test_stack_btm
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Tag: #security
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Ignore-AOSP-First: Security
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5f543d919c4067f2f4925580fd8a690ba3440e80)
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Merged-In: I3e5e3c51412640aa19f0981caaa809313d6ad030
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Change-Id: I3e5e3c51412640aa19f0981caaa809313d6ad030
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---
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jni/com_android_bluetooth_btservice_AdapterService.cpp | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/jni/com_android_bluetooth_btservice_AdapterService.cpp b/jni/com_android_bluetooth_btservice_AdapterService.cpp
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index 55b391c56..aa0a13d46 100644
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--- a/jni/com_android_bluetooth_btservice_AdapterService.cpp
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+++ b/jni/com_android_bluetooth_btservice_AdapterService.cpp
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@@ -404,6 +404,7 @@ static void callback_thread_event(bt_cb_thread_evt event) {
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return;
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}
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vm->DetachCurrentThread();
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+ callbackEnv = NULL;
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}
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}
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