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Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]

From: Paul Eggert <eggert at cs dot ucla dot edu>
To: Zack Weinberg <zackw at panix dot com>, Joseph Myers <joseph at codesourcery dot com>
Cc: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>, Andreas Schwab <schwab at linux-m68k dot org>, GNU C Library <libc-alpha at sourceware dot org>
Date: Mon, 11 Sep 2017 09:53:01 -0700
Subject: Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
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References: <1504643122-14874-1-git-send-email-adhemerval.zanella@linaro.org> <1504643122-14874-4-git-send-email-adhemerval.zanella@linaro.org> <878thop5fa.fsf@linux-m68k.org> <9455e298-8c48-c42a-0ec3-ffb8d166c69b@linaro.org> <450d2eab-f21a-f90c-6210-ea638787e339@cs.ucla.edu> <403decc7-e039-9be1-fb44-25d611540156@linaro.org> <alpine.DEB.2.20.1709111432360.18599@digraph.polyomino.org.uk> <CAKCAbMjxHb7e5Qf=C3ybPcmE3e78xpfLMQREvNm02CFk=843BQ@mail.gmail.com>

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 onevalidate that a pointer to a stat-like function is actually a pointer toa stat-like function? All one can do is call the function and pray.

Follow-Ups:
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Zack Weinberg

References:
- [PATCH 0/9] posix: glob fixes and refactor
  - From: Adhemerval Zanella
- [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Adhemerval Zanella
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Andreas Schwab
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Adhemerval Zanella
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Paul Eggert
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Adhemerval Zanella
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Joseph Myers
- Re: [PATCH 3/9] posix: Allow glob to match dangling symlinks [BZ #866]
  - From: Zack Weinberg

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