From: "hch@infradead.org" <hch@infradead.org>
To: "Xu, Lizhi" <Lizhi.Xu@windriver.com>
Cc: Christian Hesse <mail@eworm.de>,
"axboe@kernel.dk" <axboe@kernel.dk>,
"christian@heusel.eu" <christian@heusel.eu>,
"hch@infradead.org" <hch@infradead.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"ming.lei@redhat.com" <ming.lei@redhat.com>,
"syzbot+6af973a3b8dfd2faefdc@syzkaller.appspotmail.com"
<syzbot+6af973a3b8dfd2faefdc@syzkaller.appspotmail.com>,
"syzkaller-bugs@googlegroups.com"
<syzkaller-bugs@googlegroups.com>
Subject: Re: 回复: [PATCH V5] loop: Add sanity check for read/write_iter
Date: Mon, 19 May 2025 23:46:28 -0700 [thread overview]
Message-ID: <aCwlRMEuvvP31UGG@infradead.org> (raw)
In-Reply-To: <BL1PR11MB5979C666DA3BC228C2C30E92869FA@BL1PR11MB5979.namprd11.prod.outlook.com>
On Tue, May 20, 2025 at 06:29:48AM +0000, Xu, Lizhi wrote:
> I figured out your steps to reproduce, and yes, this problem will occur if you do losetup with a file in a filesystem that does not support read_iter, which is what this patch does.
isofs does support read_iter, without that it would not have worked
before either. That is not the problem. It must be related to
the FMODE_WRITE check - i.e. we have a writable FD here, but a file
system that does not actually supports writes. Which honestly feels
weird, but we'll have to figure it out to unbreak these setups.
next prev parent reply other threads:[~2025-05-20 6:46 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-24 14:08 [syzbot] [block?] BUG: unable to handle kernel NULL pointer dereference in lo_rw_aio syzbot
2025-04-25 1:19 ` [syzbot] " syzbot
2025-04-25 1:55 ` syzbot
2025-04-25 3:40 ` [PATCH] loop: Add sanity check for read/write_iter Lizhi Xu
2025-04-25 4:06 ` Zhu Yanjun
2025-04-25 4:19 ` Lizhi Xu
2025-04-25 4:20 ` Ming Lei
2025-04-25 4:33 ` Lizhi Xu
2025-04-25 5:38 ` [PATCH V2] " Lizhi Xu
2025-04-25 13:28 ` Christoph Hellwig
2025-04-26 1:50 ` Lizhi Xu
2025-04-28 12:46 ` Christoph Hellwig
2025-04-28 13:48 ` Lizhi Xu
2025-04-28 13:49 ` Christoph Hellwig
2025-04-26 2:10 ` [PATCH V3] " Lizhi Xu
2025-04-28 12:49 ` Christoph Hellwig
2025-04-28 13:42 ` Lizhi Xu
2025-04-28 13:48 ` Christoph Hellwig
2025-04-28 14:15 ` [PATCH V4] " Lizhi Xu
2025-04-28 14:26 ` Christoph Hellwig
2025-04-28 14:36 ` [PATCH V5] " Lizhi Xu
2025-05-05 13:18 ` Jens Axboe
2025-05-19 15:56 ` Christian Hesse
2025-05-20 3:00 ` Lizhi Xu
2025-05-20 5:39 ` Christian Hesse
2025-05-20 6:29 ` 回复: " Xu, Lizhi
2025-05-20 6:31 ` Christian Hesse
2025-05-20 6:49 ` Xu, Lizhi
2025-05-20 6:46 ` hch [this message]
2025-05-20 6:59 ` 回复: 回复: " Xu, Lizhi
2025-05-20 11:28 ` hch
2025-05-20 11:39 ` 回复: " Xu, Lizhi
2025-05-20 11:41 ` hch
2025-05-20 11:44 ` 回复: " Xu, Lizhi
2025-05-20 11:52 ` Xu, Lizhi
2025-05-20 12:27 ` Xu, Lizhi
2025-05-20 12:46 ` Christian Hesse
2025-05-20 12:49 ` hch
2025-05-20 13:12 ` Xu, Lizhi
2025-05-20 16:53 ` christian
2025-05-20 12:46 ` hch
2025-04-25 4:54 ` [syzbot] Re: [syzbot] [block?] BUG: unable to handle kernel NULL pointer dereference in lo_rw_aio syzbot
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