Re: [PATCH] elf: Change ldconfig auxcache magic number (bug 32231)

[Florian Weimer <fweimer@redhat.com>]

* Adhemerval Zanella Netto:

> On 24/10/24 02:52, Florian Weimer wrote:
>> In commit c628c2296392ed3bf2cb8d8470668e64fe53389f (elf: Remove
>> ldconfig kernel version check), the layout of auxcache entries
>> changed because the osversion field was removed from
>> struct aux_cache_file_entry.  However, AUX_CACHEMAGIC was not
>> changed, so existing files are still used, potentially leading
>> to unintended ldconfig behavior.  This commit changes AUX_CACHEMAGIC,
>> so that the file is regenerated.
>> 
>> Tested on x86_64-linux-gnu.  Verified manually that the early exit in
>> load_aux_cache is taken due to the change in file magic.
>> 
>> Reported-by: DJ Delorie <dj@redhat.com>
>
> Ouch, I should have know better about this one.  I think it is too late
> to backport this now.
>
> LGTM, thanks.
>
> Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Thanks.

I don't see a problem with backparting this.  It just triggers
unnecessary auxcache regeneration on upgrades/downgrades between
compatible versions.  But it will fix the update across incompatible
versions.

Thanks,
Florian