From: Florian Weimer <fw@deneb.enyo.de>
To: Rich Felker <dalias@libc.org>
Cc: Ariadne Conill <ariadne@dereferenced.org>, musl@lists.openwall.com
Subject: Re: [musl] perhaps we should add re[c]allocarray?
Date: Tue, 21 Jul 2020 20:58:04 +0200 [thread overview]
Message-ID: <87pn8or8zn.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <20200721183945.GQ14669@brightrain.aerifal.cx> (Rich Felker's message of "Tue, 21 Jul 2020 14:39:46 -0400")
* 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.
next prev parent reply other threads:[~2020-07-21 18:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-21 10:18 Ariadne Conill
2020-07-21 16:56 ` Markus Wichmann
2020-07-21 17:27 ` Hadrien Lacour
2020-07-21 23:19 ` Ariadne Conill
2020-07-21 18:39 ` Rich Felker
2020-07-21 18:58 ` Florian Weimer [this message]
2020-07-21 20:40 ` Rich Felker
2020-07-21 23:21 ` Ariadne Conill
2020-07-22 0:21 ` Rich Felker
2020-07-22 0:24 ` Ariadne Conill
2020-07-21 19:40 ` Leah Neukirchen
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