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From: Jarkko Sakkinen <jarkko@kernel.org>
To: "Mickaël Salaün" <mic@digikod.net>
Cc: "David Howells" <dhowells@redhat.com>,
	"David Woodhouse" <dwmw2@infradead.org>,
	"David S . Miller" <davem@davemloft.net>,
	"Herbert Xu" <herbert@gondor.apana.org.au>,
	"James Morris" <jmorris@namei.org>,
	"Mickaël Salaün" <mic@linux.microsoft.com>,
	"Mimi Zohar" <zohar@linux.ibm.com>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	keyrings@vger.kernel.org, linux-crypto@vger.kernel.org,
	linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	"Mimi Zohar" <zohar@linux.vnet.ibm.com>
Subject: Re: [PATCH v3 04/10] certs: Fix blacklist flag type confusion
Date: Thu, 21 Jan 2021 01:45:55 +0200	[thread overview]
Message-ID: <YAjAswPAr3tcuDhd@kernel.org> (raw)
In-Reply-To: <fc4d5812-238c-baf7-d7f6-cc123bdb855d@digikod.net>

On Wed, Jan 20, 2021 at 12:15:10PM +0100, Mickaël Salaün wrote:
> 
> On 20/01/2021 04:55, Jarkko Sakkinen wrote:
> > On Thu, Jan 14, 2021 at 04:19:03PM +0100, Mickaël Salaün wrote:
> >> From: David Howells <dhowells@redhat.com>
> >>
> >> KEY_FLAG_KEEP is not meant to be passed to keyring_alloc() or key_alloc(),
> >> as these only take KEY_ALLOC_* flags.  KEY_FLAG_KEEP has the same value as
> >> KEY_ALLOC_BYPASS_RESTRICTION, but fortunately only key_create_or_update()
> >> uses it.  LSMs using the key_alloc hook don't check that flag.
> >>
> >> KEY_FLAG_KEEP is then ignored but fortunately (again) the root user cannot
> >> write to the blacklist keyring, so it is not possible to remove a key/hash
> >> from it.
> >>
> >> Fix this by adding a KEY_ALLOC_SET_KEEP flag that tells key_alloc() to set
> >> KEY_FLAG_KEEP on the new key.  blacklist_init() can then, correctly, pass
> >> this to keyring_alloc().
> > 
> > OK, so thing work by luck now, but given the new patches which allow
> > to append new keys they would break, right?
> 
> Without this fix, patch 9/10 would allow to remove and modify keys from
> the blacklist keyring.
> 
> > 
> >> We can also use this in ima_mok_init() rather than setting the flag
> >> manually.
> > 
> > What does ima_mok_init() do?
> 
> This was initially an addition from David Howells, I only fixed the
> argument bit-ORing. ima_mok_init() allocates a blacklist keyring (with
> different properties) dedicated to IMA.
 
Please add this to the commit message.

/Jarkko

  reply	other threads:[~2021-01-21  6:33 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-14 15:18 [PATCH v3 00/10] Enable root to update the blacklist keyring Mickaël Salaün
2021-01-14 15:19 ` [PATCH v3 01/10] certs/blacklist: fix kernel doc interface issue Mickaël Salaün
2021-01-20  3:39   ` Jarkko Sakkinen
2021-01-14 15:19 ` [PATCH v3 02/10] certs: Fix blacklisted hexadecimal hash string check Mickaël Salaün
2021-01-20  3:43   ` Jarkko Sakkinen
2021-01-20 11:12     ` Mickaël Salaün
2021-01-20 23:44       ` Jarkko Sakkinen
2021-01-14 15:19 ` [PATCH v3 03/10] PKCS#7: Fix missing include Mickaël Salaün
2021-01-20  3:44   ` Jarkko Sakkinen
2021-01-14 15:19 ` [PATCH v3 04/10] certs: Fix blacklist flag type confusion Mickaël Salaün
2021-01-20  3:55   ` Jarkko Sakkinen
2021-01-20 11:15     ` Mickaël Salaün
2021-01-20 23:45       ` Jarkko Sakkinen [this message]
2021-01-14 15:19 ` [PATCH v3 05/10] certs: Replace K{U,G}IDT_INIT() with GLOBAL_ROOT_{U,G}ID Mickaël Salaün
2021-01-20  5:15   ` Jarkko Sakkinen
2021-01-20 11:17     ` Mickaël Salaün
2021-01-20 23:48       ` Jarkko Sakkinen
2021-01-14 15:19 ` [PATCH v3 06/10] certs: Make blacklist_vet_description() more strict Mickaël Salaün
2021-01-20  4:16   ` Jarkko Sakkinen
2021-01-20 11:23     ` Mickaël Salaün
2021-01-14 15:19 ` [PATCH v3 07/10] certs: Factor out the blacklist hash creation Mickaël Salaün
2021-01-14 15:19 ` [PATCH v3 08/10] certs: Check that builtin blacklist hashes are valid Mickaël Salaün
2021-01-20  5:19   ` Jarkko Sakkinen
2021-01-20 11:57     ` Mickaël Salaün
2021-01-20 23:53       ` Jarkko Sakkinen
2021-01-21  9:18         ` Mickaël Salaün
2021-01-21 15:21           ` Jarkko Sakkinen
2021-01-14 15:19 ` [PATCH v3 09/10] certs: Allow root user to append signed hashes to the blacklist keyring Mickaël Salaün
2021-01-15 13:06   ` Mimi Zohar
2021-01-20  5:23   ` Jarkko Sakkinen
2021-01-20 11:24     ` Mickaël Salaün
2021-01-14 15:19 ` [PATCH v3 10/10] tools/certs: Add print-cert-tbs-hash.sh Mickaël Salaün
2021-01-15  9:28 ` [PATCH v3 00/10] Enable root to update the blacklist keyring Jarkko Sakkinen

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