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From: Zack Weinberg <zackw@panix.com>
Date: Mon, 11 Sep 2017 17:25:00 -0000
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Subject: Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: Joseph Myers <joseph@codesourcery.com>, 
	Adhemerval Zanella <adhemerval.zanella@linaro.org>, Andreas Schwab <schwab@linux-m68k.org>, 
	GNU C Library <libc-alpha@sourceware.org>
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On Mon, Sep 11, 2017 at 12:53 PM, Paul Eggert <eggert@cs.ucla.edu> wrote:
> On 09/11/2017 07:38 AM, Zack Weinberg wrote:
>>
>> If this is done, the new symbol version should attempt to validate the
>> altdirfuncs structure on entry
>
>
> I don't see how glob could do that reliably and cheaply. How does one
> validate that a pointer to a stat-like function is actually a pointer to a
> stat-like function? All one can do is call the function and pray.

It should be enough to make a dummy call, e.g.

 pglob->gl_lstat(".", &statbuf);

zw