Make aligned_alloc match the standard.

Jemalloc does not verify that the size parameter is a multiple of
alignment. Fix this since it only went into P.

Fix the unit tests, and fix malloc debug/malloc hooks to handle this
new restrictive behavior.

Bug: 126944692

Test: Ran bionic unit tests.
Test: Ran bionic unit tests with malloc hooks enabled (no new tests fail).
Test: Ran bionic unit tests with malloc debug enabled (no new tests fail).
Test: Ran malloc debug unit tests.
Change-Id: I4d50785928815679c781ca729f998454d76b9192

1 files changed, 1 insertions, 1 deletions

diff --git a/libc/malloc_debug/malloc_debug.cpp b/libc/malloc_debug/malloc_debug.cpp
index 2e6afff55..f66295706 100644
--- a/libc/malloc_debug/malloc_debug.cpp
+++ b/libc/malloc_debug/malloc_debug.cpp
@@ -729,7 +729,7 @@ void* debug_aligned_alloc(size_t alignment, size_t size) {
   if (DebugCallsDisabled()) {
     return g_dispatch->aligned_alloc(alignment, size);
   }
-  if (!powerof2(alignment)) {
+  if (!powerof2(alignment) || (size % alignment) != 0) {
     errno = EINVAL;
     return nullptr;
   }