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From: Hillf Danton <hdanton@sina.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-mm@kvack.org,
	Hugh Dickins <hughd@google.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Jan Kara <jack@suse.cz>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org,
	syzbot+d79afb004be235636ee8@syzkaller.appspotmail.com
Subject: Re: [RFC PATCH] mm: truncate: flush lru cache for evicted inode
Date: Sat, 15 Jun 2024 07:59:53 +0800
Message-Id: <20240614235953.809-1-hdanton@sina.com>
In-Reply-To: <ZmxIvIJ3YSZDwbPW@casper.infradead.org>
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On Fri, 14 Jun 2024 14:42:20 +0100 Matthew Wilcox wrote:
> On Fri, Jun 14, 2024 at 09:18:56PM +0800, Hillf Danton wrote:
> > Flush lru cache to avoid folio->mapping uaf in case of inode teardown.
> 
> What?  inodes are supposed to have all their folios removed before
> being freed.  Part of removing a folio sets the folio->mapping to NULL.
> Where is the report?
>
Subject: Re: [syzbot] [nilfs?] [mm?] KASAN: slab-use-after-free Read in lru_add_fn
https://lore.kernel.org/lkml/000000000000cae276061aa12d5e@google.com/