linux-kernel - Re: [PATCH 12/19] x86/signal: Land on &frame->retcode when vdso isn't mapped

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Message-ID: <6ac99ea6-ccad-2719-5ff2-a0e18e52a500@gmail.com>
Date:   Mon, 9 Nov 2020 01:22:52 +0000
From:   Dmitry Safonov <0x7f454c46@...il.com>
To:     Andy Lutomirski <luto@...nel.org>, Dmitry Safonov <dima@...sta.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        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 ML <x86@...nel.org>
Subject: Re: [PATCH 12/19] x86/signal: Land on &frame->retcode when vdso isn't
 mapped

On 11/8/20 7:06 PM, Andy Lutomirski wrote:
> On Sat, Nov 7, 2020 at 9:17 PM Dmitry Safonov <dima@...sta.com> wrote:
>>
>> Since commit 9fbbd4dd17d0 ("x86: Don't require the vDSO for handling
>> a.out signals") after processing 32-bit signal if there is no vdso
>> mapped frame->retcode is used as a landing.
>> Do the same for rt ia32 signals.
> 
> Am I reading correctly that this makes the ia32 compat signals match
> the native ia32 case?

Yes, probably I should have added it to the changelog.

Thanks,
         Dmitry