linux-ext4 - Re: [PATCH 4/6] fsverity: use a hashtable to find the fsverity

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260119092748.GA10125@lst.de>
Date: Mon, 19 Jan 2026 10:27:48 +0100
From: Christoph Hellwig <hch@....de>
To: Jan Kara <jack@...e.cz>
Cc: Christoph Hellwig <hch@....de>, Eric Biggers <ebiggers@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	David Sterba <dsterba@...e.com>, Theodore Ts'o <tytso@....edu>,
	Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
	Andrey Albershteyn <aalbersh@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
	fsverity@...ts.linux.dev
Subject: Re: [PATCH 4/6] fsverity: use a hashtable to find the fsverity_info

On Mon, Jan 19, 2026 at 10:21:00AM +0100, Jan Kara wrote:
> OK, but since __fsverity_get_info() is just rhashtable_lookup_fast() what
> prevents the CPU from reordering the hash table reads before the S_VERITY
> check? I think you need a barrier in fsverity_get_info() to enforce the
> proper ordering. The matching ordering during setting of S_VERITY is
> implied by cmpxchg used to manipulate i_flags so that part should be fine.

Yes, probably.