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Date: Tue, 6 Jun 2023 16:01:08 +0100 (BST)
From: Peter Stephenson
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Subject: Re: [Bug] modules zsh/tcp, zsh/zftp unloadable, probably affecting
most modern Linuxes
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> On 06/06/2023 15:38 Jun. T wrote:
>
>
> > 2023/06/06 18:05, Peter Stephenson wrote:
> >
> >> On 06/06/2023 07:42 Jun T wrote:
> >>
> >> Why '-z now' is used when building binary packages? For security?
> >
> > I think this is just so that failure to find symbols at all will
> > show up quickly in the build rather than at run time, which would
> > be a real pain.
>
> I think '-z now' is to mark (add the flag) zftp.so so that the
> dynamic linker resolves all the symbols when _loading_ it;
> the symbols are not resolved when _building_ zftp.so.
Yes, it does say it gets applied at the point of dlopen(), so it's
explicitly counteracting RTLD_LAZY.
Is this specific to the Fedora configuration in their own source
package? I don't see an obvious sign the standard zsh build itself
is making this choice. configure has some system-specific tweaks
for dynamic loading, but not this.
pws