forked from OSchip/llvm-project
93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
// RUN: %clangxx_scudo %s -lstdc++ -o %t
|
|
// RUN: %run %t pointers 2>&1
|
|
// RUN: %run %t contents 2>&1
|
|
// RUN: %run %t usablesize 2>&1
|
|
|
|
// Tests that our reallocation function returns the same pointer when the
|
|
// requested size can fit into the previously allocated chunk. Also tests that
|
|
// a new chunk is returned if the size is greater, and that the contents of the
|
|
// chunk are left unchanged. Finally, checks that realloc copies the usable
|
|
// size of the old chunk to the new one (as opposed to the requested size).
|
|
|
|
#include <assert.h>
|
|
#include <malloc.h>
|
|
#include <string.h>
|
|
|
|
#include <vector>
|
|
|
|
#include <sanitizer/allocator_interface.h>
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
void *p, *old_p;
|
|
// Those sizes will exercise both allocators (Primary & Secondary).
|
|
std::vector<size_t> sizes{1, 16, 1024, 32768, 1 << 16, 1 << 17, 1 << 20};
|
|
|
|
assert(argc == 2);
|
|
|
|
if (!strcmp(argv[1], "usablesize")) {
|
|
// This tests a sketchy behavior inherited from poorly written libraries
|
|
// that have become somewhat standard. When realloc'ing a chunk, the
|
|
// copied contents should span the usable size of the chunk, not the
|
|
// requested size.
|
|
size_t size = 496, usable_size;
|
|
p = nullptr;
|
|
// Make sure we get a chunk with a usable size actually larger than size.
|
|
do {
|
|
if (p) free(p);
|
|
size += 16;
|
|
p = malloc(size);
|
|
usable_size = __sanitizer_get_allocated_size(p);
|
|
assert(usable_size >= size);
|
|
} while (usable_size == size);
|
|
for (int i = 0; i < usable_size; i++)
|
|
reinterpret_cast<char *>(p)[i] = 'A';
|
|
old_p = p;
|
|
// Make sure we get a different chunk so that the data is actually copied.
|
|
do {
|
|
size *= 2;
|
|
p = realloc(p, size);
|
|
assert(p);
|
|
} while (p == old_p);
|
|
// The contents of the new chunk must match the old one up to usable_size.
|
|
for (int i = 0; i < usable_size; i++)
|
|
assert(reinterpret_cast<char *>(p)[i] == 'A');
|
|
free(p);
|
|
} else {
|
|
for (size_t size : sizes) {
|
|
if (!strcmp(argv[1], "pointers")) {
|
|
old_p = p = realloc(nullptr, size);
|
|
assert(p);
|
|
size = __sanitizer_get_allocated_size(p);
|
|
// Our realloc implementation will return the same pointer if the size
|
|
// requested is lower than or equal to the usable size of the associated
|
|
// chunk.
|
|
p = realloc(p, size - 1);
|
|
assert(p == old_p);
|
|
p = realloc(p, size);
|
|
assert(p == old_p);
|
|
// And a new one if the size is greater.
|
|
p = realloc(p, size + 1);
|
|
assert(p != old_p);
|
|
// A size of 0 will free the chunk and return nullptr.
|
|
p = realloc(p, 0);
|
|
assert(!p);
|
|
old_p = nullptr;
|
|
}
|
|
if (!strcmp(argv[1], "contents")) {
|
|
p = realloc(nullptr, size);
|
|
assert(p);
|
|
for (int i = 0; i < size; i++)
|
|
reinterpret_cast<char *>(p)[i] = 'A';
|
|
p = realloc(p, size + 1);
|
|
// The contents of the reallocated chunk must match the original one.
|
|
for (int i = 0; i < size; i++)
|
|
assert(reinterpret_cast<char *>(p)[i] == 'A');
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// CHECK: ERROR: invalid chunk type when reallocating address
|