linux-kernel - Re: [PATCH v3 2/2] vfs: avoid duplicating creds in faccessat if possible

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Message-ID: <CA+icZUUH-J3eh=PSEcaHRDtcKB9svA2Qct6RiOq_MFP_+KeBLQ@mail.gmail.com>
Date:   Sun, 5 Mar 2023 10:26:03 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Yury Norov <yury.norov@...il.com>,
        Mateusz Guzik <mjguzik@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Christian Brauner <brauner@...nel.org>, serge@...lyn.com,
        paul@...l-moore.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH v3 2/2] vfs: avoid duplicating creds in faccessat if possible

On Sun, Mar 5, 2023 at 1:44 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Sat, Mar 4, 2023 at 1:10 PM Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > Whether the end result _works_ or not, I still haven't checked.
>
> Well, this particular patch at least boots for me for my normal
> config. Not that I've run any extensive tests, but I'm writing this
> email while running this patch, so ..
>

Hi Linus,

can you share your "normal config", please?

This what latest Debian kernel from unstable has (discussed Kconfigs):

# egrep 'NR_CPUS|CPUMASK_OFFSTACK|MAXSMP' /boot/config-6.1.0-5-amd64
397:CONFIG_MAXSMP=y
398:CONFIG_NR_CPUS_RANGE_BEGIN=8192
399:CONFIG_NR_CPUS_RANGE_END=8192
400:CONFIG_NR_CPUS_DEFAULT=8192
401:CONFIG_NR_CPUS=8192
10214:CONFIG_CPUMASK_OFFSTACK=y
10215:# CONFIG_FORCE_NR_CPUS is not set

What are "sane" settings in your eyes?

Full Debian kernel-config for AMD64 is attached.

Thanks.

Best regards,
-Sedat-

Download attachment "config-6.1.0-5-amd64" of type "application/octet-stream" (259490 bytes)