GNU bug report logs - #45676
Store references inside compressed data

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From: Leo Famulari <leo <at> famulari.name>
To: Miguel Ángel Arruga Vivas <rosen644835 <at> gmail.com>
Cc: 45676 <at> debbugs.gnu.org
Subject: bug#45676: Store references inside compressed data
Date: Tue, 5 Jan 2021 15:22:10 -0500

On Tue, Jan 05, 2021 at 03:36:07PM +0100, Miguel Ángel Arruga Vivas wrote:
> There are several binary formats that allow compression of the
> executable image, or some of its data, which is decompress at runtime:
> 
>   - Kernel images.
>   - Compressed libraries: e.g. Smalltalk modules.
>   - Compressed executable or data files: e.g. library.el.gz.
> 
> These aren't taken into account by the grafting process, which may lead
> to issues when store paths are located inside that kind of files.

It's a serious problem, and not just because of grafting. These obscured
references can cause things to be garbage collected inappropriately.

Here is an older case of the same problem:

https://bugs.gnu.org/24703

It was resolved by patching GCC.

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