linux-kernel - Re: [PATCH RESEND v6 0/3] certs: Prevent spurious errors on repeated blacklisting

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Message-ID: <Y8sDSSbCcxydFDYx@kernel.org>
Date:   Fri, 20 Jan 2023 21:10:33 +0000
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Thomas Weißschuh <linux@...ssschuh.net>
Cc:     David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Mickaël Salaün <mic@...ikod.net>,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Mark Pearson <markpearson@...ovo.com>
Subject: Re: [PATCH RESEND v6 0/3] certs: Prevent spurious errors on repeated
 blacklisting

On Mon, Jan 09, 2023 at 11:59:41PM +0000, Thomas Weißschuh wrote:
> When the blacklist keyring was changed to allow updates from the root
> user it gained an ->update() function that disallows all updates.
> When the a hash is blacklisted multiple times from the builtin or
> firmware-provided blacklist this spams prominent logs during boot:
> 
> [    0.890814] blacklist: Problem blacklisting hash (-13)
> 
> This affects the firmware of various vendors. Reported have been at least:
> * Samsung: https://askubuntu.com/questions/1436856/
> * Acer: https://ubuntuforums.org/showthread.php?t=2478840
> * MSI: https://forum.archlabslinux.com/t/blacklist-problem-blacklisting-hash-13-errors-on-boot/6674/7
> * Micro-Star: https://bbs.archlinux.org/viewtopic.php?id=278860
> * Lenovo: https://lore.kernel.org/lkml/c8c65713-5cda-43ad-8018-20f2e32e4432@t-8ch.de/
> 
> Note: In the meantime I lost access to the machine exhibiting the
> problematic behavior. If larger changes are required to this series
> somebody else would have to validate them or take over the series.
> 
> Changelog:
> 
> v1: https://lore.kernel.org/all/20221104014704.3469-1-linux@weissschuh.net/
> v1 -> v2:
>  * Improve logging message to include the failed hash
>  * Add key_create() function without update semantics
>  * Use key_create() from mark_raw_hash_blacklisted() and log specific message
>    on -EEXIST
> 
> v2: https://lore.kernel.org/lkml/20221109025019.1855-1-linux@weissschuh.net/
> v2 -> v3:
>  * Clarify commit titles and messages
>  * Drop the change to BLACKLIST_KEY_PERM from patch 3, as it was an artifact
>    of some obsolete version of the patch and not needed
> 
> v3: https://lore.kernel.org/lkml/20221118040343.2958-1-linux@weissschuh.net/
> v3 -> v4:
>  * Drop Fixes-tag from first patch
>  * Flesh out commit descriptions and messages
> 
> v4: https://lore.kernel.org/r/20221212-keys-blacklist-v4-0-00afeb3137fb@weissschuh.net
> v4 -> v5:
>  * Reduce lines needed by function calls in key.c
>  * Add Reviewed-by from Jarkko
> 
> v5: https://lore.kernel.org/r/20221212-keys-blacklist-v5-0-52e9eb5a8827@weissschuh.net
> v5 -> v6:
>  * Correct Jarkkos email in Reviewed-by tags
>  * Resend to hopefully reach @kernel.org recipients
> 
> Thomas Weißschuh (3):
>   certs: log hash value on blacklist error
>   KEYS: Add key_create()
>   certs: don't try to update blacklist keys
> 
>  certs/blacklist.c   |  21 ++++---
>  include/linux/key.h |   8 +++
>  security/keys/key.c | 149 +++++++++++++++++++++++++++++++++-----------
>  3 files changed, 132 insertions(+), 46 deletions(-)
> 
> --
> 2.38.1
> 
> To: David Howells <dhowells@...hat.com>
> To: David Woodhouse <dwmw2@...radead.org>
> To: Jarkko Sakkinen <jarkko@...nel.org>
> To: Paul Moore <paul@...l-moore.com>
> To: James Morris <jmorris@...ei.org>
> To: "Serge E. Hallyn" <serge@...lyn.com>
> To: "Mickaël Salaün" <mic@...ikod.net>
> Cc: keyrings@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-security-module@...r.kernel.org
> Cc: Paul Menzel <pmenzel@...gen.mpg.de>
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> Cc: Mark Pearson <markpearson@...ovo.com>
> 
> ---
> Thomas Weißschuh (3):
>       certs: make blacklisted hash available in klog
>       KEYS: Add new function key_create()
>       certs: don't try to update blacklist keys
> 
>  certs/blacklist.c   |  21 ++++----
>  include/linux/key.h |   8 +++
>  security/keys/key.c | 137 ++++++++++++++++++++++++++++++++++++++--------------
>  3 files changed, 120 insertions(+), 46 deletions(-)
> ---
> base-commit: 512dee0c00ad9e9c7ae9f11fc6743702ea40caff
> change-id: 20221212-keys-blacklist-2c79a64667c9
> 
> Best regards,
> -- 
> Thomas Weißschuh <linux@...ssschuh.net>

Hi, I'e applied and pushed this now. Thank you.

BR, Jarkko