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Re: On time64 and Large File Support

From: Demi Marie Obenour
Subject: Re: On time64 and Large File Support
Date: Wed, 1 Mar 2023 19:29:01 -0500
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On 3/1/23 17:38, Eric Blake wrote:
> [replying to the original post, because I'm not sure where else in the
> more recent activity on this thread would be more appropriate]
> On Fri, Nov 11, 2022 at 08:38:18AM +0000, Sam James wrote:
>> Hi all,
>> In Gentoo, we've been planning out what we should do for time64 on glibc [0]
>> and concluded that we need some support in glibc for a newer option. I'll 
>> outline
>> why below.
> ...
>> Indeed, the gnulib version of change #2 is exactly how we ended up with
>> wget/gnutls breaking [1]. I feel this shows that the only approach
>> "supported" by glibc right now is untenable.
>> [1]
> Now Fedora is also being hit by the gnutls ABI change due to time_t in
> public interfaces being silently changed.  From an IRC conversation I
> had with Dan Berrange and Rich Jones (I think Rich mean i686 below):
> <danpb> rjones (IRC): oh wow, the certificates created on i696 are not quite 
> right .....
> <danpb>         Validity:
> <danpb>                 Not Before: Sat Sep 05 00:23:57 UTC 2703
> <danpb>                 Not After: Sun Sep 06 00:23:57 UTC 2703
> <danpb> just a few years too early
> <danpb> i think this is looking like a gnutls regression,   downgrading 
> gnutls makes it work
> ...
> <danpb> rjones (IRC): hmm, i'm beginning to think gnutls has been miscompiled 
> by gcc
> <danpb> gnutls_x509_crt_get_activation_time inside the gnutls verification 
> api returns garbage
> <danpb> but the very same call done from a demo program returns the right 
> answer
> ...
> <danpb> OMG, gnulib-- has silently changed gnutls to use 64-bit time_t
> <danpb> ...which is an ABI incompatibility because gnutls has public APIs 
> which have time_t parameters
> <danpb> so apps talking to gnutls will expect 32-bit time_t, but gnutls is 
> processing 64-bit time_t
> <danpb> this is utterly insane

Time to do a mass rebuild and mass SONAME bump of everything shipped as 32-bits?
Demi Marie Obenour (she/her/hers)

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