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android: add opt-in JVMTI disable and handle unknown copied-methods offset #407

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android: add opt-in JVMTI disable and handle unknown copied-methods offset #407

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9d2216a
android: add opt-in JVMTI disable and handle unknown copied-methods o…
staleroot Sep 21, 2026
9eca30d
update dependencies
staleroot Sep 21, 2026
1ea5762
add build.bat
staleroot Sep 21, 2026
55e0dc8
update .gitignore
staleroot Sep 21, 2026
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -3,3 +3,4 @@
/test/.project
/test/build/
/test/node_modules/
/out/
3 changes: 3 additions & 0 deletions build.bat
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@@ -0,0 +1,3 @@
@echo off

npx frida-compile index.js -o out/frida-java-bridge.js -c -S -B esm -T none
9 changes: 8 additions & 1 deletion lib/android.js
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Expand Up @@ -547,6 +547,10 @@ function _getApi () {
function tryGetEnvJvmti (vm, runtime) {
let env = null;

if (globalThis.FRIDA_JAVA_BRIDGE_DISABLE_JVMTI === true) {
return env;
}

vm.perform(() => {
const ensurePluginLoadedAddr = getApi().find('_ZN3art7Runtime18EnsurePluginLoadedEPKcPNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEE');
if (ensurePluginLoadedAddr === null) {
Expand Down Expand Up @@ -1149,7 +1153,10 @@ export function getArtClassSpec (vm) {
}
}
if (offsetCopiedMethods === -1) {
throw new Error('Unable to find copied methods in java/lang/Thread; please file a bug');
// Layout changed (seen on Android 16): there is no u16 matching the methods array length.
// 0 is an impossible offset (it's the klass_ header), so it is used as a sentinel telling
// the native side to iterate over the whole methods array instead of only the declared ones.
offsetCopiedMethods = 0;
}

spec = {
Expand Down
10 changes: 6 additions & 4 deletions lib/class-model.js
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Expand Up @@ -313,8 +313,9 @@ model_new (jclass class_handle,
guint field_array_cursor;
gboolean merged_fields = art_api.class_offset_sfields == 0;

elements = read_art_array (class_object, art_api.class_offset_methods, sizeof (gsize), NULL);
n = *(guint16 *) (class_object + art_api.class_offset_copied_methods_offset);
elements = read_art_array (class_object, art_api.class_offset_methods, sizeof (gsize), &n);
if (art_api.class_offset_copied_methods_offset != 0)
n = *(guint16 *) (class_object + art_api.class_offset_copied_methods_offset);
for (i = 0; i != n; i++)
{
jmethodID id;
Expand Down Expand Up @@ -613,8 +614,9 @@ collect_matching_class_methods (ArtClassVisitor * self,
class_name_length = strlen (class_name);
seen_method_names = ctx->include_signature ? NULL : g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);

elements = read_art_array (klass, art_api.class_offset_methods, sizeof (gsize), NULL);
n = *(guint16 *) ((gpointer) klass + art_api.class_offset_copied_methods_offset);
elements = read_art_array (klass, art_api.class_offset_methods, sizeof (gsize), &n);
if (art_api.class_offset_copied_methods_offset != 0)
n = *(guint16 *) ((gpointer) klass + art_api.class_offset_copied_methods_offset);
for (i = 0; i != n; i++)
{
ArtMethod * method;
Expand Down
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