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// RUN: %clang_scudo %s -o %t
// RUN: %run %t valid 2>&1
// RUN: not %run %t invalid 2>&1
// RUN: %env_scudo_opts=allocator_may_return_null=1 %run %t invalid 2>&1
// Tests that the various aligned allocation functions work as intended. Also
// tests for the condition where the alignment is not a power of 2.
#include <assert.h>
#include <errno.h>
#include <malloc.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
// Sometimes the headers may not have this...
extern "C" void *aligned_alloc(size_t alignment, size_t size);
int main(int argc, char **argv)
{
void *p = nullptr;
size_t alignment = 1U << 12;
size_t size = 1U << 12;
int err;
assert(argc == 2);
if (!strcmp(argv[1], "valid")) {
posix_memalign(&p, alignment, size);
assert(p);
assert(((uintptr_t)p & (alignment - 1)) == 0);
free(p);
p = aligned_alloc(alignment, size);
assert(p);
assert(((uintptr_t)p & (alignment - 1)) == 0);
free(p);
// Tests various combinations of alignment and sizes
for (int i = (sizeof(void *) == 4) ? 3 : 4; i < 19; i++) {
alignment = 1U << i;
for (int j = 1; j < 33; j++) {
size = 0x800 * j;
for (int k = 0; k < 3; k++) {
p = memalign(alignment, size - (2 * sizeof(void *) * k));
assert(p);
assert(((uintptr_t)p & (alignment - 1)) == 0);
free(p);
}
}
}
// For larger alignment, reduce the number of allocations to avoid running
// out of potential addresses (on 32-bit).
for (int i = 19; i <= 24; i++) {
for (int k = 0; k < 3; k++) {
p = memalign(alignment, 0x1000 - (2 * sizeof(void *) * k));
assert(p);
assert(((uintptr_t)p & (alignment - 1)) == 0);
free(p);
}
}
}
if (!strcmp(argv[1], "invalid")) {
// Alignment is not a power of 2.
p = memalign(alignment - 1, size);
assert(!p);
// Size is not a multiple of alignment.
p = aligned_alloc(alignment, size >> 1);
assert(!p);
void *p_unchanged = (void *)0x42UL;
p = p_unchanged;
// Alignment is not a power of 2.
err = posix_memalign(&p, 3, size);
assert(p == p_unchanged);
assert(err == EINVAL);
// Alignment is a power of 2, but not a multiple of size(void *).
err = posix_memalign(&p, 2, size);
assert(p == p_unchanged);
assert(err == EINVAL);
}
return 0;
}
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