linux-kernel - Re: [RFC PATCH] mm: truncate: flush lru cache for evicted inode

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Date: Sat, 15 Jun 2024 07:59:53 +0800
From: Hillf Danton <hdanton@...a.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-mm@...ck.org,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	syzbot+d79afb004be235636ee8@...kaller.appspotmail.com
Subject: Re: [RFC PATCH] mm: truncate: flush lru cache for evicted inode

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/