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Re: fix audit testcase with IE TLS disabled
- From: Roland McGrath <roland at redhat dot com>
- To: Alexandre Oliva <aoliva at redhat dot com>
- Cc: libc-alpha at sources dot redhat dot com
- Date: Thu, 22 Sep 2005 14:28:42 -0700 (PDT)
- Subject: Re: fix audit testcase with IE TLS disabled
> On Sep 22, 2005, Roland McGrath <roland@redhat.com> wrote:
>
> >> As explained in the comment below, if we relocate ldso before setting
> >> up TLS, the calloc call at the end of the self relocation will either
> >> use uninitialized TLS (if libc uses IE) or crash because __tls_get_addr
> >> returns NULL.
>
> > Can you add a test case that demonstrates the failure?
>
> elf/tst-audit1 will demonstrate the failure, but only if you build
> libc without IE. I don't know how to demonstrate it otherwise.
If I understand your description, it could be produced by a malloc hook
that cares about the initialized value of a __thread variable. If you
cannot compose a case like that, then I don't understand the problem
properly based on what you have said.
Thanks,
Roland