Bug#1118385: texlive-binaries: corner-case PDF image nondeterminism

Preuße, Hilmar <[email protected]> Tue, 12 May 2026 23:38:30 +0200

Newsgroups	gmane.linux.debian.devel.tetex
Message-ID	<74c8f243-18df-4810-946e-a975c3d4ff29__48038.5691671231$1778622087$gmane$org@web.de>

Am 12.05.2026 um 04:37 schrieb Aaron M. Ucko:

Hello,

> As I recall, my pre-filing investigation found that libpng leaves any
> trailing portion of the row's final byte unspecified.  It would of
> course be possible to tighten that policy up, but there's normally no
> need to, even from a reproducibility perspective, because such bits are
> typically of no interest to consumers anyway.
> 

As far as I understood there are some (random) bytes inserted, which 
remain invisible to the consumer but are nevertheless there and make the 
file building not fully reproducible, correct? For the consumers of 
course there is no need, but there is some kind of need to make file 
creation deterministic.
This could be communicated to the piece of code generating the 
randomness. If I understand correctly it has to be found out, where that 
code is located. If you are sure, it is libpng, we should at least clone 
that bug to evaluation.

H.
-- 
sigfault

OpenPGP_signature.asc (application/pgp-signature, 840 B)