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Re: TLS redux
- From: Andreas Schwab <schwab at linux-m68k dot org>
- To: Paul Pluzhnikov <ppluzhnikov at google dot com>
- Cc: "Joseph S. Myers" <joseph at codesourcery dot com>, Roland McGrath <roland at hack dot frob dot com>, "GNU C. Library" <libc-alpha at sourceware dot org>
- Date: Mon, 27 Jan 2014 19:43:44 +0100
- Subject: Re: TLS redux
- Authentication-results: sourceware.org; auth=none
- References: <20140115022335 dot EB13174430 at topped-with-meat dot com> <Pine dot LNX dot 4 dot 64 dot 1401150520530 dot 14350 at digraph dot polyomino dot org dot uk> <CALoOobOyQxDaszErqoOkSdHsc7NestF7Pt9rS01aPzWZcnFZCQ at mail dot gmail dot com> <87r47tz5xd dot fsf at igel dot home> <CALoOobNZVFQ7z0uOgp6zAKMk7fmx03ua6S5E24UNgtVM3o=etQ at mail dot gmail dot com>
Paul Pluzhnikov <ppluzhnikov@google.com> writes:
> On Mon, Jan 27, 2014 at 9:32 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
>
>>> One example that's burned into my memory is that memory allocated by
>>> ld.so's private malloc may later be free'd by public libc.so.6 free.
>>
>> That should not happen, and would be a major bug.
>
> I could be mistaken, but I am 99% sure this *did* happen in glibc-2.2
> - 2.5 time frame under specific (and rare) execution path with
> pthread_exit from main thread or some such.
Did you file a bug report?
>>> They are the same implementation, so no harm done, right?
>>
>> The ld.so malloc is a stub implementation that has nothing in common
>> with libc malloc.
>
> Currently that's the case. Was that the case in glibc-2.2?
elf/dl-minimal.c appeared on 1995-11-22.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
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