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Date: Tue, 21 Jul 2020 16:40:53 -0400
From: Rich Felker <>
To: Florian Weimer <>
Cc: Ariadne Conill <>,
Subject: Re: perhaps we should add re[c]allocarray?

On Tue, Jul 21, 2020 at 08:58:04PM +0200, Florian Weimer wrote:
> * Rich Felker:
> > recallocarray presumably needs to zero the new part which means it
> > needs to know the old exact size, which means it depends on having
> > either knowledge of implementation internals or a working, exact
> > malloc_usable_size (AFAIK all legacy/existing ones except musl
> > mallocng are broken and return a value greater than the originally
> > allocated size).
> The caller has to pass the old member count to recallocarray, in an
> additional argument.  I think this avoids this particular issue, and
> also makes it easy to achive interposition-safety.

Ah, great, that makes it a non-issue then, and in that case I have no
significant objections to it.


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