linux-kernel - Re: [PATCH] vdso: Improve cmd_vdso_check to check all dynamic relocations

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Message-ID: <CAFP8O3+OwanSJdzd5V3oGJ_MOJOSVdbn+4iBJJKm2LCR8mCA0Q@mail.gmail.com>
Date:   Tue, 27 Sep 2022 22:25:35 -0700
From:   Fangrui Song <maskray@...gle.com>
To:     Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-csky@...r.kernel.org, loongarch@...ts.linux.dev,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH] vdso: Improve cmd_vdso_check to check all dynamic relocations

On Sat, Sep 10, 2022 at 12:53 AM Fangrui Song <maskray@...gle.com> wrote:
>
> On 2022-08-30, Fangrui Song wrote:
> >The actual intention is that no dynamic relocation exists. However, some
> >GNU ld ports produce unneeded R_*_NONE. (If a port is not care enough to
> >determine the exact .rel[a].dyn size, the trailing zeros become R_*_NONE
> >relocations. E.g. powerpc64le ld as of 2.38 has the issue with
> >defconfig.) R_*_NONE are generally no-op in the dynamic loaders. So just
> >ignore them.
> >
> >With the change, we can remove ARCH_REL_TYPE_ABS. ARCH_REL_TYPE_ABS is a
> >bit misnomer as ports may check RELAVETIVE/GLOB_DAT/JUMP_SLOT which are
> >not called "absolute relocations". (The patch is motivated by the arm64
> >port missing R_AARCH64_RELATIVE.)
> >
> >While here, replace "egrep" with "grep" as "egrep" is deprecated in GNU
> >grep 3.7.
> >
> >Signed-off-by: Fangrui Song <maskray@...gle.com>
> >---
> >[...]
> >
>
> Ping.

Ping^2 :)