linux-ext4 - Re: [PATCH 0/5] fscrypt, fs-verity: one-time init fixes

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Message-ID: <20200727163820.GC1138@sol.localdomain>
Date:   Mon, 27 Jul 2020 09:38:20 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-fscrypt@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        Daniel Rosenberg <drosen@...gle.com>,
        Satya Tangirala <satyat@...gle.com>
Subject: Re: [PATCH 0/5] fscrypt, fs-verity: one-time init fixes

On Tue, Jul 21, 2020 at 03:59:15PM -0700, Eric Biggers wrote:
> This series fixes up some cases in fs/crypto/ and fs/verity/ where
> "one-time init" is implemented using READ_ONCE() instead of
> smp_load_acquire() but it's not obviously correct.
> 
> One case is fixed by using a better approach that removes the need to
> initialize anything.  The others are fixed by upgrading READ_ONCE() to
> smp_load_acquire().  I've also improved the comments.
> 
> This is motivated by the discussions at 
> https://lkml.kernel.org/linux-fsdevel/20200713033330.205104-1-ebiggers@kernel.org/T/#u
> and
> https://lkml.kernel.org/linux-fsdevel/20200717044427.68747-1-ebiggers@kernel.org/T/#u
> 
> These fixes are improvements over the status quo, so I'd prefer to apply
> them now, without waiting for any potential new generic one-time-init
> macros (which based on the latest discussion, won't be flexible enough
> to handle most of these cases anyway).
> 
> Eric Biggers (5):
>   fscrypt: switch fscrypt_do_sha256() to use the SHA-256 library
>   fscrypt: use smp_load_acquire() for fscrypt_prepared_key
>   fscrypt: use smp_load_acquire() for ->s_master_keys
>   fscrypt: use smp_load_acquire() for ->i_crypt_info
>   fs-verity: use smp_load_acquire() for ->i_verity_info
> 
>  fs/crypto/Kconfig           |  2 +-
>  fs/crypto/fname.c           | 41 +++++++++----------------------------
>  fs/crypto/fscrypt_private.h | 15 ++++++++------
>  fs/crypto/inline_crypt.c    |  6 ++++--
>  fs/crypto/keyring.c         | 15 +++++++++++---
>  fs/crypto/keysetup.c        | 18 +++++++++++++---
>  fs/crypto/policy.c          |  4 ++--
>  fs/verity/open.c            | 15 +++++++++++---
>  include/linux/fscrypt.h     | 29 +++++++++++++++++++++-----
>  include/linux/fsverity.h    |  9 ++++++--
>  10 files changed, 96 insertions(+), 58 deletions(-)

Patches 1-4 applied to fscrypt.git#master for 5.9.
Patch 5 applied to fscrypt.git#fsverity for 5.9.

- Eric