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From: Berkant Koc <me@berkoc.com>
To: Bernd Schubert <bschubert@ddn.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	Miklos Szeredi <miklos@szeredi.hu>,
	security@kernel.org, Joanne Koong <joannelkoong@gmail.com>,
	linux-kernel@vger.kernel.org, io-uring@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>,
	Pavel Begunkov <asml.silence@gmail.com>,
	fuse-devel <fuse-devel@lists.linux.dev>
Subject: Re: [PATCH 2/2] fuse: wait for aborted connection before releasing last fuse_dev
Date: Mon, 18 May 2026 16:32:18 +0200	[thread overview]
Message-ID: <20260518143218.7c7c1689.clarification@berkoc.com> (raw)
In-Reply-To: <2889c98c-21e8-47eb-903a-ea40bf5c8c04@ddn.com>

On Mon, 18 May 2026 11:47:00 +0000, Bernd Schubert <bschubert@ddn.com> wrote:
> Would it be possible for you to test the attached patch?

Reproducer and KASAN harness from the PATCH 2/2 series are staged.
Two-arm plan: revert vs apply, race-widening debug hunk kept in both
arms, 2x50 iterations each against torvalds/master tip, KASAN + lockdep
+ kmemleak enabled. Results back within the day once the base resolves.

Blocker before I build. The patch references ring->chan and chan->conn.
On mainline fs/fuse/dev_uring_i.h declares struct fuse_ring with
struct fuse_conn *fc at line 110, no chan member; grep fuse_chan
across fs/fuse/ returns zero hits. As-is the patch fails to compile
with "struct fuse_ring has no member named chan".

Is this based on a DDN topic branch that introduces a fuse_chan
abstraction not yet upstream? If so, point me at the base tree or
branch URL and I will rebase the test against that. If the references
were meant to be ring->fc and fc against current mainline, confirm and
I will adjust before the run.

Assisted-by: Claude:claude-opus-4-7 berkoc-pipeline

  reply	other threads:[~2026-05-18 14:33 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20260517095846.fuse-iouring-uaf.dc5f5dbb71dc@berkoc.com>
     [not found] ` <2026051703-equinox-multitude-91e2@gregkh>
2026-05-17 12:59   ` [PATCH 0/2] fuse: io-uring: fix two UAFs in dev_uring.c teardown Berkant Koc
2026-05-17 12:59     ` [PATCH 1/2] fuse: io-uring: clear ent->fuse_req in commit_fetch error path Berkant Koc
2026-05-17 14:11       ` Bernd Schubert
2026-05-17 14:24         ` Berkant Koc
2026-05-17 12:59     ` [PATCH 2/2] fuse: wait for aborted connection before releasing last fuse_dev Berkant Koc
2026-05-17 15:00       ` Bernd Schubert
2026-05-18  1:13         ` Berkant Koc
2026-05-18  9:55           ` Bernd Schubert
2026-05-18 11:47             ` Bernd Schubert
2026-05-18 14:32               ` Berkant Koc [this message]
2026-05-18 14:46                 ` Bernd Schubert
2026-05-18 15:35                   ` Joanne Koong
2026-05-18 17:49                     ` Berkant Koc
2026-05-18 15:47                   ` Berkant Koc
2026-05-18  9:06         ` Pavel Begunkov
2026-05-18  9:50           ` Bernd Schubert
2026-05-18 10:32             ` Pavel Begunkov
2026-05-17 13:14     ` [PATCH 0/2] fuse: io-uring: fix two UAFs in dev_uring.c teardown Berkant Koc
2026-05-17 13:43       ` Bernd Schubert
2026-05-17 14:02         ` Berkant Koc

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