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ntdll: Add 8 more bytes to the block tail when tail checking is enabled.

This commit is contained in:
Alexandre Julliard 2010-01-27 13:33:53 +01:00
parent d387a34d96
commit 31aa3900e4
2 changed files with 18 additions and 4 deletions
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14
dlls/kernel32/tests/heap.c
View File

@ -488,7 +488,7 @@ static void test_heap_checks( DWORD flags )
{
BYTE old, *p, *p2;
BOOL ret;
SIZE_T size, large_size = 800 * 1024 + 37;
SIZE_T i, size, large_size = 800 * 1024 + 37;
if (flags & HEAP_PAGE_ALLOCS) return; /* no tests for that case yet */
trace( "testing heap flags %08x\n", flags );
@ -640,6 +640,18 @@ static void test_heap_checks( DWORD flags )
ret = HeapFree( GetProcessHeap(), 0, p );
ok( ret, "HeapFree failed\n" );
/* test block sizes when tail checking */
if (flags & HEAP_TAIL_CHECKING_ENABLED)
{
for (size = 0; size < 64; size++)
{
p = HeapAlloc( GetProcessHeap(), 0, size );
for (i = 0; i < 32; i++) if (p[size + i] != 0xab) break;
ok( i >= 8, "only %lu tail bytes for size %lu\n", i, size );
HeapFree( GetProcessHeap(), 0, p );
}
}
}
static void test_debug_heap( const char *argv0, DWORD flags )

8
dlls/ntdll/heap.c
View File

@ -106,6 +106,8 @@ C_ASSERT( sizeof(ARENA_LARGE) % LARGE_ALIGNMENT == 0 );
#define HEAP_MIN_SHRINK_SIZE (HEAP_MIN_DATA_SIZE+sizeof(ARENA_FREE))
/* minimum size to start allocating large blocks */
#define HEAP_MIN_LARGE_BLOCK_SIZE 0x7f000
/* extra size to add at the end of block for tail checking */
#define HEAP_TAIL_EXTRA_SIZE(flags) (flags & HEAP_TAIL_CHECKING_ENABLED ? 8 : 0)
/* Max size of the blocks on the free lists */
static const SIZE_T HEAP_freeListSizes[] =
@ -677,7 +679,7 @@ static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, SIZE_T size)
static void *allocate_large_block( HEAP *heap, DWORD flags, SIZE_T size )
{
ARENA_LARGE *arena;
SIZE_T block_size = sizeof(*arena) + ROUND_SIZE(size);
SIZE_T block_size = sizeof(*arena) + ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE(flags);
LPVOID address = NULL;
if (block_size < size) return NULL; /* overflow */
@ -1581,7 +1583,7 @@ PVOID WINAPI RtlAllocateHeap( HANDLE heap, ULONG flags, SIZE_T size )
if (!heapPtr) return NULL;
flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
flags |= heapPtr->flags;
rounded_size = ROUND_SIZE(size);
rounded_size = ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE( flags );
if (rounded_size < size) /* overflow */
{
if (flags & HEAP_GENERATE_EXCEPTIONS) RtlRaiseStatus( STATUS_NO_MEMORY );
@ -1735,7 +1737,7 @@ PVOID WINAPI RtlReAllocateHeap( HANDLE heap, ULONG flags, PVOID ptr, SIZE_T size
flags |= heapPtr->flags;
if (!(flags & HEAP_NO_SERIALIZE)) RtlEnterCriticalSection( &heapPtr->critSection );
rounded_size = ROUND_SIZE(size);
rounded_size = ROUND_SIZE(size) + HEAP_TAIL_EXTRA_SIZE(flags);
if (rounded_size < size) goto oom; /* overflow */
if (rounded_size < HEAP_MIN_DATA_SIZE) rounded_size = HEAP_MIN_DATA_SIZE;