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perf(binder): skip interception for system transaction codes

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AIDL methods use codes 1..0x00ffffff. System transactions like
PING_TRANSACTION (0x5f4e4750) fall above that range. Intercepting
pings forces a full JNI round-trip to Java and back, adding enough
latency for timing detectors to flag the ratio (3.85x vs 3.0x
threshold). Early-return for codes above LAST_CALL_TRANSACTION
eliminates this overhead while preserving all AIDL interception.
This commit is contained in:
Enginex0
2026-03-10 16:37:50 +01:00
parent 4a96491e63
commit 1f076468db
1 changed files with 6 additions and 0 deletions
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app/src/main/cpp/binder_interceptor.cpp
+6
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@@ -358,6 +358,12 @@ void inspectAndRewriteTransaction(binder_transaction_data *txn_data) {
if (txn_data->data_size > kMaxInterceptableDataSize)
return;
// AIDL methods use codes in [FIRST_CALL_TRANSACTION, LAST_CALL_TRANSACTION] (1..0x00ffffff).
// System transactions (PING, INTERFACE, DUMP, SHELL_COMMAND) use codes above that range.
// Skip those — intercepting a ping adds measurable latency that timing detectors flag.
if (txn_data->code > 0x00ffffffu && txn_data->code != intercept::kBackdoorCode)
return;
bool hijack = false;
ThreadTransactionInfo info;