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/*
* Copyright (c) 2016, 2024, 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 "memory/allocation.inline.hpp"
#include "memory/guardedMemory.hpp"
#include "runtime/os.hpp"
#include "unittest.hpp"
#define GEN_PURPOSE_TAG ((void *) ((uintptr_t)0xf000f000))
static void guarded_memory_test_check(void* p, size_t sz, void* tag) {
ASSERT_TRUE(p != nullptr) << "nullptr pointer given to check";
u_char* c = (u_char*) p;
GuardedMemory guarded(c);
EXPECT_EQ(guarded.get_tag(), tag) << "Tag is not the same as supplied";
EXPECT_EQ(guarded.get_user_ptr(), c) << "User pointer is not the same as supplied";
EXPECT_EQ(guarded.get_user_size(), sz) << "User size is not the same as supplied";
EXPECT_TRUE(guarded.verify_guards()) << "Guard broken";
}
class GuardedMemoryTest {
public:
static size_t get_guard_header_size() {
return sizeof (GuardedMemory::GuardHeader);
}
static size_t get_guard_size() {
return sizeof (GuardedMemory::Guard);
}
};
// Test GuardedMemory size
TEST(GuardedMemory, size) {
size_t total_sz = GuardedMemory::get_total_size(1);
ASSERT_GT(total_sz, (size_t) 1) << "Unexpected size";
ASSERT_GE(total_sz, GuardedMemoryTest::get_guard_header_size() + 1
+ GuardedMemoryTest::get_guard_size()) << "Unexpected size";
}
// Test the basic characteristics
TEST(GuardedMemory, basic) {
u_char* basep =
(u_char*) os::malloc(GuardedMemory::get_total_size(1), mtInternal);
GuardedMemory guarded(basep, 1, GEN_PURPOSE_TAG);
EXPECT_EQ(badResourceValue, *basep)
<< "Expected guard in the form of badResourceValue";
u_char* userp = guarded.get_user_ptr();
EXPECT_EQ(uninitBlockPad, *userp)
<< "Expected uninitialized data in the form of uninitBlockPad";
guarded_memory_test_check(userp, 1, GEN_PURPOSE_TAG);
void* freep = guarded.release_for_freeing();
EXPECT_EQ((u_char*) freep, basep) << "Expected the same pointer guard was ";
EXPECT_EQ(freeBlockPad, *userp) << "Expected user data to be free block padded";
EXPECT_FALSE(guarded.verify_guards());
os::free(freep);
}
// Test a number of odd sizes
TEST(GuardedMemory, odd_sizes) {
u_char* basep =
(u_char*) os::malloc(GuardedMemory::get_total_size(1), mtInternal);
GuardedMemory guarded(basep, 1, GEN_PURPOSE_TAG);
size_t sz = 0;
do {
void* p = os::malloc(GuardedMemory::get_total_size(sz), mtInternal);
void* up = guarded.wrap_with_guards(p, sz, (void*) 1);
memset(up, 0, sz);
guarded_memory_test_check(up, sz, (void*) 1);
if (HasFatalFailure()) {
return;
}
os::free(guarded.release_for_freeing());
sz = (sz << 4) + 1;
} while (sz < (256 * 1024));
}
// Test buffer overrun into head...
TEST(GuardedMemory, buffer_overrun_head) {
u_char* basep =
(u_char*) os::malloc(GuardedMemory::get_total_size(1), mtInternal);
GuardedMemory guarded(basep, 1, GEN_PURPOSE_TAG);
guarded.wrap_with_guards(basep, 1);
*basep = 0;
EXPECT_FALSE(guarded.verify_guards());
os::free(basep);
}
// Test buffer overrun into tail with a number of odd sizes
TEST(GuardedMemory, buffer_overrun_tail) {
u_char* basep =
(u_char*) os::malloc(GuardedMemory::get_total_size(1), mtInternal);
GuardedMemory guarded(basep, 1, GEN_PURPOSE_TAG);
size_t sz = 1;
do {
void* p = os::malloc(GuardedMemory::get_total_size(sz), mtInternal);
void* up = guarded.wrap_with_guards(p, sz, (void*) 1);
memset(up, 0, sz + 1); // Buffer-overwrite (within guard)
EXPECT_FALSE(guarded.verify_guards()) << "Guard was not broken as expected";
os::free(guarded.release_for_freeing());
sz = (sz << 4) + 1;
} while (sz < (256 * 1024));
}
// Test wrap_copy/wrap_free
TEST(GuardedMemory, wrap) {
EXPECT_TRUE(GuardedMemory::free_copy(nullptr)) << "Expected free nullptr to be OK";
const char* str = "Check my bounds out";
size_t str_sz = strlen(str) + 1;
char* str_copy = (char*) GuardedMemory::wrap_copy(str, str_sz);
guarded_memory_test_check(str_copy, str_sz, nullptr);
if (HasFatalFailure()) {
return;
}
EXPECT_STREQ(str, str_copy) << "Not identical copy";
EXPECT_TRUE(GuardedMemory::free_copy(str_copy)) << "Free copy failed to verify";
void* no_data = nullptr;
void* no_data_copy = GuardedMemory::wrap_copy(no_data, 0);
EXPECT_TRUE(GuardedMemory::free_copy(no_data_copy))
<< "Expected valid guards even for no data copy";
}
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