Re: Dumper issue, revisited; invalid realloc/free

[Rich Felker <dalias@libc.org>]

On Wed, Feb 04, 2015 at 09:44:17PM +0200, Eli Zaretskii wrote:
> > Date: Wed, 4 Feb 2015 14:37:32 -0500
> > From: Rich Felker <dalias@libc.org>
> > Cc: emacs-devel@gnu.org
> > 
> > > > http://www.openwall.com/lists/musl/2015/02/03/1
> > > 
> > > I suggest that you take a look at src/w32heap.c on Emacs's master
> > > branch.  There' you will see a simple solution of a very similar (if
> > > not identical) problem we have on MS-Windows.  It even includes a
> > > simple handling of large allocations.
> > 
> > As I suspected, this code is used only if you use gmalloc.c. It's not
> > used with system_malloc=yes, which is the case I'm concerned about.
> 
> No, you are mistaken.  The 'master' version of Emacs uses the system
> malloc on MS-Windows.  Perhaps you are looking at the 'emacs-24'
> branch, where indeed we use gmalloc.c and ralloc.c, with sbrk
> emulation in w32heap.c.  But that's not what I had in mind.

Upon checking master, w32heap.c is not using the system malloc. It's
its own implementation of the malloc API written on top of the Win32
HeapAlloc API.

Rich