[PATCH 3/3] malloc: Remove currently broken memory tagging

[Yury Khrustalev]

On Fri, May 08, 2026 at 06:29:43PM +0200, Florian Weimer wrote:
> * Yury Khrustalev:
> 
> ...
>
> I think this was with glibc-2.39-derived code, so a bit different from
> the malloc in the current tree.
> 

The code in malloc.c and arena.c and adjacent files is being changed
regularly, and memory tagging hasn't been broken all at once. I suppose
some use cases still work, but overall it's broken because it'd been
interleaved with core (i.e. target independent) malloc implementation,
and changes made to it were not carefully validated wrt to restrictions
imposed by this "embedded" memory tagging code (see for instance comment
about memory tagging across internal interfaces above the CHUNK_HDR_SZ
macro in malloc/malloc.c).

Anyway, to avoid it being accidentally broken again, we should decouple
target independent code from AArch64-specific, and for this we need this
patch...

Thanks,
Yury