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Re: [RFC] Prevent tailcall optimizations of libdl functions

From: Carlos O'Donell <carlos at redhat dot com>
To: Florian Weimer <fweimer at redhat dot com>, Yuri Gribov <tetra2005 at gmail dot com>, GNU C Library <libc-alpha at sourceware dot org>
Cc: bugdal at aerifal dot cx, Jakub Jelinek <jakub at redhat dot com>
Date: Wed, 25 Jan 2017 22:04:06 -0500
Subject: Re: [RFC] Prevent tailcall optimizations of libdl functions
Authentication-results: sourceware.org; auth=none
References: <CAJOtW+6jEwdUV1AC3+Us6U39S5+47MqbROcH8Fqi_iTMJdWaEA@mail.gmail.com> <0fcf0333-a3f8-f6aa-4968-cfbc89765857@redhat.com>

On 01/25/2017 06:28 AM, Florian Weimer wrote:
> I'd also caution against adding yet another mechanism to preserve the
> caller context.

Would you mind expanding a bit on your caution here?

It seems to me that it might be reasonable to do both the wrapper and
the compiler attribute to prevent dlsym from breaking in unexpected
ways.

-- 
Cheers,
Carlos.

Follow-Ups:
- Re: [RFC] Prevent tailcall optimizations of libdl functions
  - From: Florian Weimer

References:
- [RFC] Prevent tailcall optimizations of libdl functions
  - From: Yuri Gribov
- Re: [RFC] Prevent tailcall optimizations of libdl functions
  - From: Florian Weimer

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