linux-kernel - Re: [PATCH] ocfs2: Add i

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Message-ID: <tencent_A2C892F8065B09AEAEC9AECACC9967FE4606@qq.com>
Date: Wed, 21 Aug 2024 17:08:58 +0800
From: Edward Adam Davis <eadavis@...com>
To: willy@...radead.org
Cc: eadavis@...com,
	jlbec@...lplan.org,
	joseph.qi@...ux.alibaba.com,
	linux-kernel@...r.kernel.org,
	mark@...heh.com,
	ocfs2-devel@...ts.linux.dev,
	syzbot+5a64828fcc4c2ad9b04f@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] ocfs2: Add i_size check for dir

On Tue, 20 Aug 2024 15:59:56 +0100, Matthew Wilcox 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?
In this issue, Yes.

--
Edward