Re: glibc qsort() vulnerability - Mailing list pgsql-hackers

From Mats Kindahl
Subject Re: glibc qsort() vulnerability
Date
Msg-id CA+14425aKjd=i8B3g5FGK9UFdEPAgUYsHLjjiBM35_jHoU0wWQ@mail.gmail.com
Whole thread Raw
In response to Re: glibc qsort() vulnerability  (Nathan Bossart <nathandbossart@gmail.com>)
List pgsql-hackers
On Thu, Feb 8, 2024 at 9:07 PM Nathan Bossart <nathandbossart@gmail.com> wrote:
On Thu, Feb 08, 2024 at 11:59:54AM -0800, Andres Freund wrote:
> On 2024-02-08 13:44:02 -0500, Tom Lane wrote:
>> Are we okay with using macros that (a) have double evaluation hazards
>> and (b) don't enforce the data types being compared are the same?
>> I think static inlines might be a safer technology.
>
> +1

Agreed on static inlines.

Seems to be a general consensus on static inlines. I'll get a new patch.
 
> I'd put these static inlines into common/int.h. I don't think this is common
> enough to warrant being in c.h. Probably also doesn't hurt to have a not quite
> as generic name as INT_CMP, I'd not be too surprised if that's defined in some
> library.
>
>
> I think it's worth following int.h's pattern of including [s]igned/[u]nsigned
> in the name, an efficient implementation for signed might not be the same as
> for unsigned. And if we use static inlines, we need to do so for correct
> semantics anyway.

Seems reasonable to me.

Agree.

Best wishes,
Mats Kindahl
 

--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

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