Should glibc be fully reentrant? -- No. (Roland was right).

[Florian Weimer]

On 12/11/2014 02:56 AM, Carlos O'Donell wrote:
> After serious review it seems like we will need to start by
> saying that an interposed malloc must operate as-if it were
> in async-signal context and use only those functions which
> are marked as async-signal-safe.

Practically speaking, this seems rather restrictive.  Most mallocs need 
locking, and implementations may want to use pthread mutexes.  Those are 
not async-signal-safe, and I doubt they can be made reentrant, either.

To clarify, I think the idea is fine, it's just the wording that needs 
fine-tuning.

-- 
Florian Weimer / Red Hat Product Security