linux-kernel - Re: [PATCH v3 00/23] Add generic vdso

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Message-ID: <c9d24f64-4c34-703f-2223-113076e07b46@csgroup.eu>
Date:   Thu, 17 Jun 2021 11:13:44 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will@...nel.org>, x86@...nel.org
Subject: Re: [PATCH v3 00/23] Add generic vdso_base tracking



Le 11/06/2021 à 20:02, Dmitry Safonov a écrit :
> v3 Changes:
> - Migrated arch/powerpc to vdso_base
> - Added x86/selftest for unmapped vdso & no landing on fast syscall
> - Review comments from Andy & Christophe (thanks!)
> - Amended s/born process/execed process/ everywhere I noticed
> - Build robot warning on cast from __user pointer
> 
> I've tested it on x86, I would appreciate any help with
> Tested-by on arm/arm64/mips/powerpc/s390/... platforms.

I tried it on powerpc, normal use still works.

What tests can be done exactly ?

We have a selftest in powerpc 
(https://github.com/linuxppc/linux/blob/master/tools/testing/selftests/powerpc/signal/sigreturn_vdso.c) 
but it doesn't work anymore since the split of VDSO into VDSO+VVAR.

Christophe