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Message-ID: <a5d94f04-a980-ee3f-bd8d-42df3a859777@spawn.link>
Date: Wed, 30 Sep 2020 15:16:20 -0400
From: Antonio SJ Musumeci <trapexit@...wn.link>
To: Miklos Szeredi <miklos@...redi.hu>,
Alessio Balsini <balsini@...roid.com>
Cc: Akilesh Kailash <akailash@...gle.com>,
Amir Goldstein <amir73il@...il.com>,
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 9/30/2020 2:45 PM, Miklos Szeredi wrote:
> 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
In my usecase I'm changing euid/egid of the thread to whichever the
uid/gid was passed to the server which is otherwise running as root.
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