On Tue, Sep 6, 2011 at 12:00 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> [ Sorry for letting this slip through the cracks ... I think I got
> distracted by collation bugs :-( ]
>
> Noah Misch <noah@leadboat.com> writes:
>> On Sat, Mar 12, 2011 at 12:44:29PM -0500, Tom Lane wrote:
>>> Noah Misch <noah@leadboat.com> writes:
>>>> A suitably-instrumented run of "make installcheck-world" under valgrind turned
>>>> up a handful of memory-related bugs:
>
>>> Hmm, interesting work, but I don't think I believe in the necessity for
>>> this kluge:
>>>
>> + else if (attributeName != &(att->attname))
>> + namestrcpy(&(att->attname), attributeName);
>
> I'm still of the opinion that there's no real need to avoid memcpy with
> identical source and destination, so I didn't apply this first patch.
I am leery of memcpy with overlapping regions. I know that it can
cause an infinite loop on ssse3 architectures, having to do with some
backwards-iteration it does:
https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/609290
I have spotted this in the wild in PostgreSQL (which is how I happened
to produce this bug report link so readily), yet very rarely; I mailed
a more detailed report to the security list.
--
fdr
