mirror of
https://github.com/openjdk/jdk.git
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114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdio.h>
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#include <limits.h>
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#include "jvmti.h"
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#include "jvmti_common.hpp"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// The runner() frame at depth 1; INT_MAX makes (slot + extra_slot) overflow
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// for the long/double accessors.
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static const jint Depth = 1;
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static const jint OverflowSlot = INT_MAX; // 0x7fffffff
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static jvmtiEnv *jvmti = nullptr;
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// Each access below MUST come back as JVMTI_ERROR_INVALID_SLOT. On an unfixed
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// VM the overflowing bounds check is bypassed and the subsequent
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// locals->at(INT_MAX) access crashes the VM before we ever see a return code.
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static bool expect_invalid_slot(const char* what, jvmtiError err) {
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if (err == JVMTI_ERROR_INVALID_SLOT) {
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LOG(" PASS: %s returned JVMTI_ERROR_INVALID_SLOT (%d) for slot=INT_MAX\n", what, err);
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return true;
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}
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LOG(" FAIL: %s returned %d for slot=INT_MAX, expected JVMTI_ERROR_INVALID_SLOT (%d)\n",
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what, err, JVMTI_ERROR_INVALID_SLOT);
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return false;
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}
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JNIEXPORT jboolean JNICALL
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Java_GetSetLocalSlotOverflow_testOverflow(JNIEnv *env, jclass cls, jobject thread) {
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if (jvmti == nullptr) {
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LOG("JVMTI client was not properly loaded!\n");
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return JNI_FALSE;
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}
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jlong lval = 0;
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jdouble dval = 0;
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// T_LONG / T_DOUBLE => extra_slot == 1 => INT_MAX + 1 overflows to INT_MIN.
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bool ok = true;
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ok &= expect_invalid_slot("GetLocalLong", jvmti->GetLocalLong(thread, Depth, OverflowSlot, &lval));
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ok &= expect_invalid_slot("GetLocalDouble", jvmti->GetLocalDouble(thread, Depth, OverflowSlot, &dval));
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ok &= expect_invalid_slot("SetLocalLong", jvmti->SetLocalLong(thread, Depth, OverflowSlot, (jlong)0));
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ok &= expect_invalid_slot("SetLocalDouble", jvmti->SetLocalDouble(thread, Depth, OverflowSlot, (jdouble)0));
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return ok ? JNI_TRUE : JNI_FALSE;
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}
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static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jint res;
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jvmtiError err;
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static jvmtiCapabilities caps;
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res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_9);
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if (res != JNI_OK || jvmti == nullptr) {
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LOG("Wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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caps.can_access_local_variables = 1;
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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LOG("AddCapabilities: unexpected error: %d\n", err);
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return JNI_ERR;
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}
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err = jvmti->GetCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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LOG("GetCapabilities: unexpected error: %d\n", err);
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return JNI_ERR;
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}
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if (!caps.can_access_local_variables) {
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LOG("Warning: Access to local variables is not implemented\n");
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return JNI_ERR;
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}
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return JNI_OK;
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}
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JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL
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Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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#ifdef __cplusplus
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}
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#endif
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