From: Matthew Wilcox <willy@infradead.org>
To: Edward Adam Davis <eadavis@qq.com>
Cc: syzbot+5a64828fcc4c2ad9b04f@syzkaller.appspotmail.com,
jlbec@evilplan.org, joseph.qi@linux.alibaba.com,
linux-kernel@vger.kernel.org, mark@fasheh.com,
ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: Re: [PATCH] ocfs2: Add i_size check for dir
Date: Tue, 20 Aug 2024 15:59:56 +0100 [thread overview]
Message-ID: <ZsSvbDxMtUEHEldl@casper.infradead.org> (raw)
In-Reply-To: <tencent_EC9ACDC0793A6F742D7D6FA094F0E96AEF0A@qq.com>
On Tue, Aug 20, 2024 at 08:08:38PM +0800, Edward Adam Davis wrote:
> When the i_size of dir is too large, it will cause limit to overflow and
> be less than de_buf, ultimately resulting in last_de not being initialized
> and causing uaf issue.
>
> + if (i_size_read(dir) > OCFS2_MAX_BLOCKSIZE)
> + return -EINVAL;
Surely directories can be more than one block in size?
next prev parent reply other threads:[~2024-08-20 15:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 7:58 [syzbot] [ocfs2?] general protection fault in ocfs2_prepare_dir_for_insert syzbot
2024-08-20 11:19 ` Edward Adam Davis
2024-08-20 11:42 ` syzbot
2024-08-20 12:08 ` [PATCH] ocfs2: Add i_size check for dir Edward Adam Davis
2024-08-20 12:44 ` Joseph Qi
2024-08-20 13:55 ` Edward Adam Davis
2024-08-21 10:41 ` Joseph Qi
2024-08-21 11:15 ` Edward Adam Davis
2024-08-20 14:59 ` Matthew Wilcox [this message]
2024-08-21 6:16 ` heming.zhao
2024-08-21 9:08 ` Edward Adam Davis
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