svn commit: r352421 - head/stand/libsa

[Toomas Soome]

> 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.

rgds,
toomas