Re: On time64 and Large File Support

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From: Demi Marie Obenour <[email protected]>
To: Eric Blake <[email protected]>, Sam James <[email protected]>
Cc: Carlos O'Donell via Libc-alpha <[email protected]>,
 [email protected], [email protected],
 Zack Weinberg <[email protected]>, David Seifert <[email protected]>,
 Gentoo Toolchain <[email protected]>, =?UTF-8?Q?Arsen_Arsenovi=c4=87?=
 <[email protected]>, Paul Eggert <[email protected]>, [email protected],
 [email protected]
Message-ID: <[email protected]>
Subject: Re: On time64 and Large File Support
References: <[email protected]>
 <[email protected]>
In-Reply-To: <[email protected]>

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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]
>=20
> 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 gli=
bc [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 wit=
h
>> wget/gnutls breaking [1]. I feel this shows that the only approach
>> "supported" by glibc right now is untenable.
>=20
>> [1] https://bugs.gentoo.org/828001
>=20
> 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):
>=20
> <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 misco=
mpiled by gcc
> <danpb> gnutls_x509_crt_get_activation_time inside the gnutls verificat=
ion api returns garbage
> <danpb> but the very same call done from a demo program returns the rig=
ht answer
> ...
> <danpb> OMG, gnulib-- has silently changed gnutls to use 64-bit time_t
> <danpb> ...which is an ABI incompatibility because gnutls has public AP=
Is 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 3=
2-bits?
--=20
Sincerely,
Demi Marie Obenour (she/her/hers)

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