From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1096E22FDFF; Tue, 22 Jul 2025 13:50:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753192222; cv=none; b=JEnHAWCfeWFx0EIn+b/hXq8JiDczFX7tiliEAjrBXg4+vENuAAtXThlBdc3HShY4QrHQhKgmbcSMj7o4uNqUmWVPE+pGKMLkMzGuIK3zUss9x/Q5kly9wj2vi+DH0NfQo00DH1Jhi1uPFBke038GMdw2pmtVv8EZAyIdhrLi1eA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753192222; c=relaxed/simple; bh=bb7KtLo46a3ckn6mm3+IYFHTEZO/HU2x35hTCNETye0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=rCXsuJQBfFi/rvlJKOEKxxd8MuA+Zn9GR2DNP4e36TGjaSBzzxsG96GgXHijm//LZMacfAnq7MgER8+gs2Eehj7pleWCTyEs+TN0v3cBu4QmUoZYzi0+GMOLDFQnN38g5RgKWOgjlXj11JY1QW1TS9FwevwyPDglHtQdIV+5luE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jWQcgf5h; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jWQcgf5h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA7D1C4CEEB; Tue, 22 Jul 2025 13:50:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753192221; bh=bb7KtLo46a3ckn6mm3+IYFHTEZO/HU2x35hTCNETye0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=jWQcgf5h3pdNPtQtp8Z7rJLHzLQnZsfkUkkfqs/g6OXmGFnXD6P555nZXwf8Nukog vmjbOuqPRonnQMK2mNlgCUm4oDRcp3GfhUucmqqzuD65lAJI11mWSPGhEciWuFwpSE wxmiQhY2d7lRcqvr1I+N7mLMY24a/3FDUPDcc9mDagKorHfv5OzoMQfK95wvM2j1V9 OojFVQhbI62b26CI0kng58ZC71BmSjUMWoDgGVu/Gc+Q/o9XYzztZ/3TP99WyuIwRX X4hbyLjfrUqcSRzSStoS2Z2aHqFvZNnCWZ+IgGfcVt1Vi2nwdiO+xaI4PRb3jjO+F/ 5o528ecSypaBQ== Message-ID: <4aa89e94145074a70e51df7353e7e19e30efd06d.camel@kernel.org> Subject: Re: [PATCH RFC DRAFT v2 00/13] Move fscrypt and fsverity out of struct inode From: Jeff Layton To: Christian Brauner , Jan Kara , Christoph Hellwig , Jens Axboe , Josef Bacik Cc: Eric Biggers , "Theodore Y. Ts'o" , linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org, fsverity@lists.linux.dev Date: Tue, 22 Jul 2025 09:50:19 -0400 In-Reply-To: <20250722-work-inode-fscrypt-v2-0-782f1fdeaeba@kernel.org> References: <20250722-work-inode-fscrypt-v2-0-782f1fdeaeba@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf 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Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-fscrypt@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-07-22 at 14:57 +0200, Christian Brauner wrote: > Hey, >=20 > This is a POC. We're still discussing alternatives and I want to provide > some useful data on what I learned about using offsets to drop fscrypt > and fsverity from struct inode. >=20 > As discussed, this moves the fscrypt and fsverity pointers out of struct > inode shrinking it by 16 bytes. The pointers move into the individual > filesystems that actually do make use of them. >=20 > In order to find the fscrypt and fsverity data pointers offsets from the > embedded struct inode in the filesystem's private inode data are > stored in struct inode_operations. This means we get fast access to the > data pointers without having to rely on indirect calls. >=20 > Bugs & Issues > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 > * For fscrypt specifically the biggest issue is > fscrypt_prepare_new_inode() is called in filesystem's inode allocation > functions before inode->i_op is set. That means the offset isn't > available at the time when we would need it. To fix this we can set > dummy encrypted inode operations for the respective filesystem with an > initialized offset. >=20 > * For both fscrypt & fsverity the biggest issue is that every codepath > that currently calls make_bad_inode() after having initialized fscrypt > or fsverity data will override inode->i_op with bad_inode_ops. At > which point we're back to the previous problem: The offset isn't > available anymore. So when inode->i_sb->s_op->evict_inode() is called > fscrypt_put_encryption_info() doesn't have the offset available > anymore and would corrupt the hell out of everything and also leak > memory. >=20 > Obviously we could use a flag to detect a bad inodes instead of i_op > and let the filesystem assign it's own bad inode operations including > the correct offset. Is it worth it? >=20 > The other way I see we can fix this if we require fixed offsets in the > filesystems inode so fscrypt and fsverity always now what offset to > calculate. We could use two consecutive pointers at the beginning of > the filesystem's inode. Does that always work and is it worth it? >=20 We could store the offsets in the superblock. It's an extra pointer chase to get to the offset in that case, but presumably it should be in cache in most cases. We could even do both -- store it in i_ops and somehow allow falling back to looking in the superblock when i_ops isn't set or when make_bad_inode has been called. > Thanks! > Christian >=20 > Test results: >=20 > + sudo ./check -g encrypt,verity > FSTYP -- ext4 > PLATFORM -- Linux/x86_64 localhost 6.16.0-rc1-g15c8eb9cdbd3 #267 SMP= PREEMPT_DYNAMIC Fri Jun 5 15:58:00 CEST 2015 > MKFS_OPTIONS -- -F /dev/nvme3n1p6 > MOUNT_OPTIONS -- -o acl,user_xattr /dev/nvme3n1p6 /mnt/scratch >=20 > ext4/024 3s ... 3s > generic/395 4s ... 4s > generic/396 3s ... 3s > generic/397 4s ... 3s > generic/398 4s ... 4s > generic/399 39s ... 35s > generic/419 3s ... 4s > generic/421 4s ... 4s > generic/429 14s ... 14s > generic/435 23s ... 22s > generic/440 3s ... 4s > generic/548 10s ... 9s > generic/549 9s ... 9s > generic/550 [not run] encryption policy '-c 9 -n 9 -f 0' is unusabl= e; probably missing kernel crypto API support > generic/572 6s > generic/573 4s > generic/574 28s > generic/575 9s > generic/576 5s ... 4s > generic/577 4s > generic/579 24s > generic/580 4s ... 4s > generic/581 10s ... 11s > generic/582 10s ... 9s > generic/583 9s ... 9s > generic/584 [not run] encryption policy '-c 9 -n 9 -v 2 -f 0' is un= usable; probably missing kernel crypto API support > generic/592 10s ... 10s > generic/593 4s ... 4s > generic/595 7s ... 7s > generic/602 9s ... 10s > generic/613 20s ... 20s > generic/621 9s ... 9s > generic/624 3s > generic/625 3s > generic/692 5s > generic/693 [not run] encryption policy '-c 1 -n 10 -v 2 -f 0' is u= nusable; probably missing kernel crypto API support > generic/739 17s ... 18s > Ran: ext4/024 generic/395 generic/396 generic/397 generic/398 generic/399= generic/419 generic/421 generic/429 generic/435 generic/440 generic/548 ge= neric/549 generic/550 generic/572 generic/573 generic/574 generic/575 gener= ic/576 generic/577 generic/579 generic/580 generic/581 generic/582 generic/= 583 generic/584 generic/592 generic/593 generic/595 generic/602 generic/613= generic/621 generic/624 generic/625 generic/692 generic/693 generic/739 > Not run: generic/550 generic/584 generic/693 > Passed all 37 tests >=20 > --- > Changes in v2: > - First full implementation. > - Link to v1: https://lore.kernel.org/20250715-work-inode-fscrypt-v1-1-aa= 3ef6f44b6b@kernel.org >=20 > --- > Christian Brauner (13): > fs: add fscrypt offset > fs/crypto: use accessors > ext4: move fscrypt to filesystem inode > ubifs: move fscrypt to filesystem inode > f2fs: move fscrypt to filesystem inode > ceph: move fscrypt to filesystem inode > fs: drop i_crypt_info from struct inode > fs: add fsverity offset > fs/verity: use accessors > btrfs: move fsverity to filesystem inode > ext4: move fsverity to filesystem inode > f2fs: move fsverity to filesystem inode > fs: drop i_verity_info from struct inode >=20 > fs/btrfs/btrfs_inode.h | 3 +++ > fs/btrfs/inode.c | 20 ++++++++++++++++- > fs/ceph/dir.c | 8 +++++++ > fs/ceph/inode.c | 21 ++++++++++++++++++ > fs/crypto/bio.c | 2 +- > fs/crypto/crypto.c | 8 +++---- > fs/crypto/fname.c | 8 +++---- > fs/crypto/fscrypt_private.h | 2 +- > fs/crypto/hooks.c | 2 +- > fs/crypto/inline_crypt.c | 10 ++++----- > fs/crypto/keysetup.c | 27 +++++++++++++---------- > fs/crypto/policy.c | 6 ++--- > fs/ext4/ext4.h | 9 ++++++++ > fs/ext4/file.c | 8 +++++++ > fs/ext4/ialloc.c | 2 ++ > fs/ext4/inode.c | 1 + > fs/ext4/mballoc.c | 3 +++ > fs/ext4/namei.c | 23 ++++++++++++++++++++ > fs/ext4/super.c | 6 +++++ > fs/ext4/symlink.c | 24 ++++++++++++++++++++ > fs/f2fs/f2fs.h | 7 ++++++ > fs/f2fs/file.c | 8 +++++++ > fs/f2fs/inode.c | 1 + > fs/f2fs/namei.c | 41 ++++++++++++++++++++++++++++++++++ > fs/f2fs/super.c | 6 +++++ > fs/ubifs/dir.c | 52 ++++++++++++++++++++++++--------------= ------ > fs/ubifs/file.c | 8 +++++++ > fs/ubifs/super.c | 8 +++++++ > fs/ubifs/ubifs.h | 3 +++ > fs/verity/enable.c | 2 +- > fs/verity/fsverity_private.h | 2 +- > fs/verity/open.c | 18 +++++++++------ > fs/verity/verify.c | 2 +- > include/linux/fs.h | 10 ++------- > include/linux/fscrypt.h | 31 ++++++++++++++++++++++++-- > include/linux/fsverity.h | 21 ++++++++++++------ > include/linux/netfs.h | 6 +++++ > 37 files changed, 337 insertions(+), 82 deletions(-) > --- > base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 > change-id: 20250715-work-inode-fscrypt-2b63b276e793 --=20 Jeff Layton