[haiku-commits] Re: r35478 - in haiku/trunk: headers/posix src/system/libroot/posix/malloc_debug
- From: Ingo Weinhold <ingo_weinhold@xxxxxx>
- To: haiku-commits@xxxxxxxxxxxxx
- Date: Tue, 16 Feb 2010 00:03:40 +0100
On 2010-02-15 at 21:28:15 [+0100], mmlr@xxxxxxxx wrote:
> Author: mmlr
> Date: 2010-02-15 21:28:15 +0100 (Mon, 15 Feb 2010)
> New Revision: 35478
> Changeset: http://dev.haiku-os.org/changeset/35478/haiku
>
> Modified:
> haiku/trunk/headers/posix/malloc_debug.h
> haiku/trunk/src/system/libroot/posix/malloc_debug/heap.cpp
> Log:
> * Add heap_debug_set_memory_reuse() which allows to disable memory reuse,
> keeping all returned heap memory in the 0xdeadbeef state (including the
> first sizeof(void *) bytes otherwise for the free list). While wasting a
> lot
> of memory it allows you to rely on 0xdeadbeef being always present as no
> future allocation will reuse the freed memory block.
> * Also added heap_debug_malloc_with_guard_page() which is intended to
> allocate
> a memory block so it is aligned that the start of invalid memory past the
> allocation is in an unmapped guard page. However the kernel backend that
> would
> guarantee this is not yet implemented, so right now this works only by
> chance
> if no other area happens to be allocated exactly past the created one.
You can use the POSIXy mprotect() (<sys/mman.h>) to change the page's
protection to unaccessable.
CU, Ingo
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