linux-kernel - Re: [PATCH V9 2/4] fuse: Trace daemon creds

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Message-ID: <CAJfpegvvf4MfO4Jw5A=TJJfrxN_1xFTmwBJ2bb9UfzYBgkhzzQ@mail.gmail.com>
Date:   Wed, 30 Sep 2020 20:45:08 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Alessio Balsini <balsini@...roid.com>
Cc:     Akilesh Kailash <akailash@...gle.com>,
        Amir Goldstein <amir73il@...il.com>,
        Antonio SJ Musumeci <trapexit@...wn.link>,
        David Anderson <dvander@...gle.com>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Jann Horn <jannh@...gle.com>, Jens Axboe <axboe@...nel.dk>,
        Martijn Coenen <maco@...roid.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Lawrence <paullawrence@...gle.com>,
        Stefano Duo <stefanoduo@...gle.com>,
        Zimuzo Ezeozue <zezeozue@...gle.com>,
        fuse-devel <fuse-devel@...ts.sourceforge.net>,
        kernel-team <kernel-team@...roid.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V9 2/4] fuse: Trace daemon creds

On Thu, Sep 24, 2020 at 3:13 PM Alessio Balsini <balsini@...roid.com> wrote:
>
> Add a reference to the FUSE daemon credentials, so that they can be used to
> temporarily raise the user credentials when accessing lower file system
> files in passthrough.

Hmm, I think it would be better to store the creds of the ioctl()
caller together with the open file.   The mounter may deliberately
have different privileges from the process doing the actual I/O.

Thanks,
Miklos