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.
