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move allocations between half a page and a page as close to the end of

the page as possible (i.e. make malloc option P a default).
ok art@ millert@ krw@
OPENBSD_4_5
otto 16 years ago
parent
commit
5b2827b23a
2 changed files with 5 additions and 4 deletions
  1. +3
    -2
      src/lib/libc/stdlib/malloc.3
  2. +2
    -2
      src/lib/libc/stdlib/malloc.c

+ 3
- 2
src/lib/libc/stdlib/malloc.3 View File

@ -30,9 +30,9 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $OpenBSD: malloc.3,v 1.56 2008/11/02 14:42:01 otto Exp $
.\" $OpenBSD: malloc.3,v 1.57 2008/11/20 09:05:15 otto Exp $
.\"
.Dd $Mdocdate: November 2 2008 $
.Dd $Mdocdate: November 20 2008 $
.Dt MALLOC 3
.Os
.Sh NAME
@ -254,6 +254,7 @@ Freed chunks are filled with 0xdf.
Allocations larger than half a page but smaller that a page
are aligned to the end of a page to catch buffer overruns in more
cases.
This is the default.
.It Cm R
.Dq realloc .
Always reallocate when


+ 2
- 2
src/lib/libc/stdlib/malloc.c View File

@ -1,4 +1,4 @@
/* $OpenBSD: malloc.c,v 1.109 2008/11/20 09:01:24 otto Exp $ */
/* $OpenBSD: malloc.c,v 1.110 2008/11/20 09:05:15 otto Exp $ */
/*
* Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
*
@ -154,7 +154,7 @@ static int malloc_active; /* status of malloc */
static int malloc_freeprot; /* mprotect free pages PROT_NONE? */
static int malloc_hint; /* call madvice on free pages? */
static int malloc_junk; /* junk fill? */
static int malloc_move; /* move allocations to end of page? */
static int malloc_move = 1; /* move allocations to end of page? */
static int malloc_realloc; /* always realloc? */
static int malloc_xmalloc; /* xmalloc behaviour? */
static int malloc_zero; /* zero fill? */


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