linux-kernel - Re: [PATCH V4 16/17] riscv: compat: Add COMPAT Kbuild skeletal support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJF2gTTc=zwD__zXwYbO8vmup5evWJtzyiAF9Pm-UVHLJRc5hQ@mail.gmail.com>
Date:   Tue, 1 Feb 2022 17:13:37 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Arnd Bergmann <arnd@...db.de>,
        Anup Patel <anup@...infault.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        liush <liush@...winnertech.com>, Wei Fu <wefu@...hat.com>,
        Drew Fustini <drew@...gleboard.org>,
        Wang Junqiang <wangjunqiang@...as.ac.cn>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V4 16/17] riscv: compat: Add COMPAT Kbuild skeletal support

On Tue, Feb 1, 2022 at 3:45 PM Christoph Hellwig <hch@....de> wrote:
>
> On Mon, Jan 31, 2022 at 09:50:58PM +0800, Guo Ren wrote:
> > On Mon, Jan 31, 2022 at 8:26 PM Christoph Hellwig <hch@...radead.org> wrote:
> > >
> > > Given that most rv64 implementations can't run in rv32 mode, what is the
> > > failure mode if someone tries it with the compat mode enabled?
> > A static linked simple hello_world could still run on a non-compat
> > support hardware. But most rv32 apps would meet different userspace
> > segment faults.
> >
> > Current code would let the machine try the rv32 apps without detecting
> > whether hw support or not.
>
> Hmm, we probably want some kind of check for not even offer running
> rv32 binaries.  I guess trying to write UXL some time during early
> boot and catching the resulting exception would be the way to go?

Emm... I think it's unnecessary. Free rv32 app running won't cause
system problem, just as a wrong elf running. They are U-mode
privileged.
>
> >
> >
> > --
> > Best Regards
> >  Guo Ren
> >
> > ML: https://lore.kernel.org/linux-csky/
> ---end quoted text---



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/