lkml.org 
[lkml]   [2007]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 2/3] MAP_NOZERO - implement sys_brk2()
On 6/26/07, Rik van Riel <riel@redhat.com> wrote:
> Since programs can get back free()d memory after a malloc(),
> with the old contents of the memory intact, surely your
> MAP_NONZERO behavior could be the default for programs that
> can get away with it?
>
> Maybe we could use some magic ELF header, similar to the
> way non-executable stack is handled?

No. This is an implementation detail of the libc version. The malloc
as compiled today is expecting brk-ed memory to be zeroed. This
default can of course be changed (it's a simple define) but you cannot
make this the default behavior for brk.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-06-27 05:49    [W:0.073 / U:0.616 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site