svn commit: r352421 - head/stand/libsa

[Konstantin Belousov]

On Tue, Sep 17, 2019 at 12:05:26PM +0300, Toomas Soome wrote:
> 
> 
> > On 17 Sep 2019, at 11:56, Konstantin Belousov <kostikbel at gmail.com> wrote:
> > 
> > On Mon, Sep 16, 2019 at 08:28:09PM +0000, Toomas Soome wrote:
> >> Author: tsoome
> >> Date: Mon Sep 16 20:28:08 2019
> >> New Revision: 352421
> >> URL: https://svnweb.freebsd.org/changeset/base/352421
> >> 
> >> Log:
> >>  loader: Malloc(0) should return NULL.
> >> 
> >>  We really should not allocate anything with size 0.
> > Why ?  This is quite unexpected from other environments, where
> > malloc(0) returns unique object.
> > 
> 
> Hiding bugs. And, we are not getting unique object, we are getting chunk of memory with payload length of 0 and the memory content depends on if head and tail guards are used - the chunk is with size at least MALLOCALIGN (16 or 64 bytes) and the chunk is from random location of heap.
> 

Yes, exactly, this is how all other mallocs behave.