Re: [PATCH] Check multiple NT_GNU_PROPERTY_TYPE_0 notes [BZ #23509]

["H.J. Lu" <hjl dot tools at gmail dot com>]

On Wed, Aug 15, 2018 at 8:17 AM, Florian Weimer <fweimer@redhat.com> wrote:
> On 08/14/2018 08:12 PM, H.J. Lu wrote:
>>
>> _dl_process_cet_property_note is called on on each PT_NOTE segment.
>> We must keep searching until we found a PT_NOTE segment with a
>> NT_GNU_PROPERTY_TYPE_0 note:
>>
>>    /* Skip if we have seen a NT_GNU_PROPERTY_TYPE_0 note before.  */
>>    if (l->l_cet != lc_unknown)
>>      return;
>> ...
>
>
> What if there are different segments, each one with its own
> NT_GNU_PROPERTY_TYPE_0?  Wouldn't that point to lack of linker support, too?
> So that CET needs to be disabled?

Older linkers puts all NT_GNU_PROPERTY_TYPE_0 notes in one
.note.gnu.property section.  One can certainly create some random notes
which look like NT_GNU_PROPERTY_TYPE_0.  I don't think we need to
check these notes.


-- 
H.J.