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From: Miklos Szeredi <miklos@szeredi.hu>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, virtio-fs-list <virtio-fs@redhat.com>
Subject: Re: [PATCH v2 4/6] fuse: Kill suid/sgid using ATTR_MODE if it is not truncate
Date: Tue, 22 Sep 2020 15:56:47 +0200	[thread overview]
Message-ID: <CAJfpegsncAteUfTAHAttwyVQmhGoK7FCeO_z+xcB_4QkYZEzsQ@mail.gmail.com> (raw)
In-Reply-To: <20200916161737.38028-5-vgoyal@redhat.com>

On Wed, Sep 16, 2020 at 6:18 PM Vivek Goyal <vgoyal@redhat.com> wrote:

> But if this is non-truncate setattr then server will not kill suid/sgid.
> So continue to send ATTR_MODE to kill suid/sgid for non-truncate setattr,
> even if ->handle_killpriv_v2 is enabled.

Sending ATTR_MODE doesn't make sense, since that is racy.   The
refresh-recalculate makes the race window narrower, but it doesn't
eliminate it.

I think I suggested sending write synchronously if suid/sgid/caps are
set.  Do you see a problem with this?

Does this affect anything other than cached writes?

Thanks,
Miklos

  reply	other threads:[~2020-09-22 13:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-16 16:17 [PATCH v2 0/6] fuse: Implement FUSE_HANDLE_KILLPRIV_V2 and enable SB_NOSEC Vivek Goyal
2020-09-16 16:17 ` [PATCH v2 1/6] fuse: Introduce the notion of FUSE_HANDLE_KILLPRIV_V2 Vivek Goyal
2020-09-16 16:17 ` [PATCH v2 2/6] fuse: Set FUSE_WRITE_KILL_PRIV in cached write path Vivek Goyal
2020-09-16 16:17 ` [PATCH v2 3/6] fuse: setattr should set FATTR_KILL_PRIV upon size change Vivek Goyal
2020-09-16 16:17 ` [PATCH v2 4/6] fuse: Kill suid/sgid using ATTR_MODE if it is not truncate Vivek Goyal
2020-09-22 13:56   ` Miklos Szeredi [this message]
2020-09-22 20:08     ` Vivek Goyal
2020-09-22 21:25       ` Miklos Szeredi
2020-09-22 21:31         ` Vivek Goyal
2020-09-16 16:17 ` [PATCH v2 5/6] fuse: Add a flag FUSE_OPEN_KILL_PRIV for open() request Vivek Goyal
2020-09-16 16:17 ` [PATCH v2 6/6] virtiofs: Support SB_NOSEC flag to improve direct write performance Vivek Goyal
2020-09-16 16:38 ` [PATCH v2 0/6] fuse: Implement FUSE_HANDLE_KILLPRIV_V2 and enable SB_NOSEC Vivek Goyal

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