7016797: Hotspot: securely/restrictive load dlls and new API for loading system dlls
Summary: Created Windows Dll wrapped to handle jdk6 and jdk7 platform requirements, also provided more restictive Dll search orders for Windows system Dlls.
Reviewed-by: acorn, dcubed, ohair, alanb
/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "prims/jvm.h"
#include "runtime/os.hpp"
#include "utilities/decoder.hpp"
HMODULE Decoder::_dbghelp_handle = NULL;
bool Decoder::_can_decode_in_vm = false;
pfn_SymGetSymFromAddr64 Decoder::_pfnSymGetSymFromAddr64 = NULL;
pfn_UndecorateSymbolName Decoder::_pfnUndecorateSymbolName = NULL;
void Decoder::initialize() {
if (!_initialized) {
_initialized = true;
HINSTANCE handle = os::win32::load_Windows_dll("dbghelp.dll", NULL, 0);
if (!handle) {
_decoder_status = helper_not_found;
return;
}
_dbghelp_handle = handle;
pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions");
pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize");
_pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64");
_pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)GetProcAddress(handle, "UnDecorateSymbolName");
if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) {
_pfnSymGetSymFromAddr64 = NULL;
_pfnUndecorateSymbolName = NULL;
::FreeLibrary(handle);
_dbghelp_handle = NULL;
_decoder_status = helper_func_error;
return;
}
_pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS);
if (!_pfnSymInitialize(GetCurrentProcess(), NULL, TRUE)) {
_pfnSymGetSymFromAddr64 = NULL;
_pfnUndecorateSymbolName = NULL;
::FreeLibrary(handle);
_dbghelp_handle = NULL;
_decoder_status = helper_init_error;
return;
}
// find out if jvm.dll contains private symbols, by decoding
// current function and comparing the result
address addr = (address)Decoder::initialize;
char buf[MAX_PATH];
if (decode(addr, buf, sizeof(buf), NULL) == no_error) {
_can_decode_in_vm = !strcmp(buf, "Decoder::initialize");
}
}
}
void Decoder::uninitialize() {
assert(_initialized, "Decoder not yet initialized");
_pfnSymGetSymFromAddr64 = NULL;
_pfnUndecorateSymbolName = NULL;
if (_dbghelp_handle != NULL) {
::FreeLibrary(_dbghelp_handle);
}
_initialized = false;
}
bool Decoder::can_decode_C_frame_in_vm() {
initialize();
return _can_decode_in_vm;
}
Decoder::decoder_status Decoder::decode(address addr, char *buf, int buflen, int *offset) {
assert(_initialized, "Decoder not yet initialized");
if (_pfnSymGetSymFromAddr64 != NULL) {
PIMAGEHLP_SYMBOL64 pSymbol;
char symbolInfo[MAX_PATH + sizeof(IMAGEHLP_SYMBOL64)];
pSymbol = (PIMAGEHLP_SYMBOL64)symbolInfo;
pSymbol->MaxNameLength = MAX_PATH;
pSymbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
DWORD64 displacement;
if (_pfnSymGetSymFromAddr64(::GetCurrentProcess(), (DWORD64)addr, &displacement, pSymbol)) {
if (buf != NULL) {
if (!demangle(pSymbol->Name, buf, buflen)) {
jio_snprintf(buf, buflen, "%s", pSymbol->Name);
}
}
if (offset != NULL) *offset = (int)displacement;
return no_error;
}
}
return helper_not_found;
}
bool Decoder::demangle(const char* symbol, char *buf, int buflen) {
assert(_initialized, "Decoder not yet initialized");
return _pfnUndecorateSymbolName != NULL &&
_pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE);
}