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Re: [PATCH] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables

From: Kees Cook <kees at outflux dot net>
To: Ulrich Drepper <drepper at gmail dot com>
Cc: libc-alpha at sourceware dot org
Date: Fri, 23 Dec 2011 10:51:33 -0800
Subject: Re: [PATCH] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables
References: <20111222235102.GQ12321@outflux.net><CAOPLpQcNA-5WiuxpxLUF1P1r3aoMhpmMdabL8am3E9ZTaUCndw@mail.gmail.com>

On Fri, Dec 23, 2011 at 01:37:06PM -0500, Ulrich Drepper wrote:
> This causes binary compatibility issues.  Otherwise it would have long
> since been done.

Ah, dang. What's the situation it causes? The test suite entirely passed
after making this change, so I was hopeful. Could some kind of compat mode
be introduced to handle the other cases? I'd be happy to try to work it
out, but I'm not sure how to recreate the failure condition you mean.

Thanks,

-Kees

-- 
Kees Cook                                            @outflux.net

Follow-Ups:
- Re: [PATCH] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables
  - From: Kees Cook

References:
- [PATCH] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables
  - From: Kees Cook
- Re: [PATCH] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables
  - From: Ulrich Drepper

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