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From: "matmal01 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug sanitizer/100665] [hwsanitizer] nested funtion pointer is
 tagged but never checked.
Date: Tue, 01 Jun 2021 09:53:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100665

Matthew Malcomson <matmal01 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #3 from Matthew Malcomson <matmal01 at gcc dot gnu.org> ---
(In reply to Hongtao.liu from comment #2)
> (In reply to Matthew Malcomson from comment #1)
> > Given that, the question of whether the function pointer (i.e. the poin=
ter to
> > the trampoline inside that object) should be tagged when passed elsewhe=
re
> > then
> > has a few benefits:
> > 1) In this case there is no check performed, but there may be checks
> > performed
> >    if e.g. this function pointer gets cast to an integer pointer and so=
me
> > code
> >    elsewhere attempts to read that integer.
> I'm not sure there're cases where code pointers are casted to integer
> pointers. But consider the above comment, I agree that tag is needed for =
the
> object.

Fair ;-).
My reasoning was along the lines of "it's an escaped pointer, and I don't k=
now
what other code will do with it" than actually expecting that to happen.=