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From: "nsz at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/27072] New: static pie ifunc resolvers run before
 hwcap is setup
Date: Tue, 15 Dec 2020 11:01:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27072

            Bug ID: 27072
           Summary: static pie ifunc resolvers run before hwcap is setup
           Product: glibc
           Version: 2.32
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: nsz at gcc dot gnu.org
  Target Milestone: ---

as far as i can tell in csu/libc-start.c

  _dl_relocate_static_pie ();

is before

  _dl_aux_init (auxvec);

so ifunc resolvers are run before GL(dl_hwcap) and GL(dl_hwcap2) are set up.

on aarch64 this at least affects memory tagging: non-MTE-safe string functi=
ons
are selected in static PIE binaries unconditionally.

but i think this is a bug on all targets where hwcap is passed to ifunc
resolvers and support static pie.

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