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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/testapp.h>
using namespace vespalib;
void check_ptr_real(void *ptr)
{
(void) ptr;
}
void (*check_ptr)(void *ptr) = check_ptr_real;
void overwrite_memory_real(char *ptr, int offset)
{
*(ptr + offset) = 0;
}
void (*overwrite_memory)(char *ptr, int offset) = overwrite_memory_real;
char *new_vec_real(size_t size)
{
return new char[size];
}
char *(*new_vec)(size_t size) = new_vec_real;
void delete_vec_real(char *ptr)
{
delete [] ptr;
}
void (*delete_vec)(char *ptr) = delete_vec_real;
class Test : public TestApp
{
public:
int Main() override;
~Test();
private:
void testFillValue(char *a);
void verifyPreWriteDetection(); // Should abort
void verifyPostWriteDetection(); // Should abort
void verifyWriteAfterFreeDetection(); // Should abort
};
Test::~Test() = default;
void Test::testFillValue(char *a)
{
// Verify fillvalue
EXPECT_EQUAL((int)a[0], 0x66);
EXPECT_EQUAL((int)a[1], 0x66);
EXPECT_EQUAL((int)a[255], 0x66);
// Make sure that enough blocks of memory is allocated and freed.
for (size_t i(0); i < 100; i++) {
char *d = new_vec(256);
memset(d, 0x77, 256);
check_ptr(d);
delete_vec(d);
EXPECT_EQUAL((int)d[0], 0x66);
EXPECT_EQUAL((int)d[1], 0x66);
EXPECT_EQUAL((int)d[255], 0x66);
}
// Make sure we trigger vespamallocd detection of memory written after delete.
char *aa[1024];
for (size_t i(0); i < sizeof(aa)/sizeof(aa[0]); i++) {
aa[i] = new_vec(256);
}
// Verify overwrite detection in place after cleaning up.
for (size_t i(0); i < sizeof(aa)/sizeof(aa[0]); i++) {
check_ptr(aa[i]);
delete_vec(aa[i]);
EXPECT_EQUAL((int)a[0], 0x66);
EXPECT_EQUAL((int)a[1], 0x66);
EXPECT_EQUAL((int)a[255], 0x66);
}
}
void Test::verifyPreWriteDetection()
{
char * a = new_vec(8);
overwrite_memory(a, -1);
delete_vec(a);
}
void Test::verifyPostWriteDetection()
{
char * a = new_vec(8);
overwrite_memory(a, 8);
delete_vec(a);
}
void Test::verifyWriteAfterFreeDetection()
{
// Make sure that enough blocks of memory is allocated and freed.
char * a = new_vec(256);
check_ptr(a);
delete_vec(a);
for (size_t i(0); i < 100; i++) {
char *d = new_vec(256);
check_ptr(d);
delete_vec(d);
}
// Write freed memory.
a[0] = 0;
// Make sure we trigger vespamallocd detection of memory written after delete.
char *aa[1024];
for (size_t i(0); i < sizeof(aa)/sizeof(aa[0]); i++) {
aa[i] = new_vec(256);
}
// Clean up.
for (size_t i(0); i < sizeof(aa)/sizeof(aa[0]); i++) {
check_ptr(aa[i]);
delete_vec(aa[i]);
}
}
int Test::Main()
{
TEST_INIT("overwrite_test");
char * a = new_vec(256);
memset(a, 0x77, 256);
a[0] = 0;
EXPECT_EQUAL((int)a[0], 0);
EXPECT_EQUAL((int)a[1], 0x77);
EXPECT_EQUAL((int)a[255], 0x77);
char * b = a;
EXPECT_EQUAL(a, b);
check_ptr(a);
delete_vec(a);
EXPECT_EQUAL(a, b);
if (_argc > 1) {
testFillValue(a);
if (strcmp(_argv[1], "prewrite") == 0) {
verifyPreWriteDetection();
return 0;
} else if (strcmp(_argv[1], "postwrite") == 0) {
verifyPostWriteDetection();
return 0;
} else if (strcmp(_argv[1], "writeafterfree") == 0) {
verifyWriteAfterFreeDetection();
return 0;
}
} else {
// Verify that nothing is done when not expected too.
EXPECT_EQUAL((int)a[0], 0);
EXPECT_EQUAL((int)a[1], 0x77);
EXPECT_EQUAL((int)a[255], 0x77);
}
TEST_DONE();
return 42;
}
TEST_APPHOOK(Test)
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