From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 964083851C3D; Thu,  7 Jan 2021 14:00:57 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 964083851C3D
From: "nsz at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/27072] static pie ifunc resolvers run before hwcap
 is setup
Date: Thu, 07 Jan 2021 14:00:57 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.32
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: nsz at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: security-
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-27072-131-ZcaMJdJfG5@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-27072-131@http.sourceware.org/bugzilla/>
References: <bug-27072-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Jan 2021 14:00:57 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D27072

--- Comment #3 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #2)
> Did you run into
>=20
> https://sourceware.org/bugzilla/show_bug.cgi?id=3D13302

first of all IRELATIVE relocs are in a separate
section (.rela.plt where DT_JUMPREL points to)
that is processed later than RELATIVE relocs
(which are in .rela.dyn where DT_RELA points to)
see the two 'ranges' in _ELF_DYNAMIC_DO_RELOC.

with static pie 'ELF_DURING_STARTUP' is set, so
the two ranges are not processed separately, but
in one go, but because of the different section,
IRELATIVE is necessarily after RELATIVE in the
binary.

of course glibc may choose to process relocs in
different order than they appear in the binary.
see elf_dynamic_do_Rela, but that's not a linker
issue anymore.

(within DT_JUMPREL i'd expect ld to order IRELATIVE
after JUMP_SLOT relocs, but before TLSDESC relocs,
but such relocs cannot appear in static pie so this
is not relevant here anyway.)

also note that currently in glibc the aarch64 ifunc
resolvers don't depend on RELATIVE relocs so even
if there was no ordering the reloc processing would
work for now (assuming no user ifuncs).

in short 13302 is not relevant to this bug.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=