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From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Peter Jones <pjones@redhat.com>,
	"AKASHI, Takahiro" <takahiro.akashi@linaro.org>,
	David Howells <dhowells@redhat.com>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	Kalle Valo <kvalo@codeaurora.org>,
	Seth Forshee <seth.forshee@canonical.com>,
	Johannes Berg <johannes.berg@intel.com>,
	linux-integrity@vger.kernel.org,
	Hans de Goede <hdegoede@redhat.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andres Rodriguez <andresx7@gmail.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andy Lutomirski <luto@kernel.org>,
	Casey Schaufler <casey@schaufler-ca.com>
Subject: Re: [PATCH 3/6] firmware: differentiate between signed regulatory.db and other firmware
Date: Thu, 10 May 2018 23:26:39 +0000	[thread overview]
Message-ID: <20180510232639.GF27853@wotan.suse.de> (raw)
In-Reply-To: <1525917658.3551.322.camel@linux.vnet.ibm.com>

On Wed, May 09, 2018 at 10:00:58PM -0400, Mimi Zohar wrote:
> On Wed, 2018-05-09 at 23:48 +0000, Luis R. Rodriguez wrote:
> > On Wed, May 09, 2018 at 06:06:57PM -0400, Mimi Zohar wrote:
> 
> > > > > Yes, writing regdb as a micro/mini LSM sounds reasonable.  The LSM
> > > > > would differentiate between other firmware and the regulatory.db based
> > > > > on the firmware's pathname.
> > > > 
> > > > If that is the only way then it would be silly to do the mini LSM as all
> > > > calls would have to have the check. A special LSM hook for just the
> > > > regulatory db also doesn't make much sense.
> > > 
> > > All calls to request_firmware() are already going through this LSM
> > > hook.  I should have said, it would be based on both READING_FIRMWARE
> > > and the firmware's pathname.
> > 
> > Yes, but it would still be a strcmp() computation added for all
> > READING_FIRMWARE. In that sense, the current arrangement is only open coding the
> > signature verification for the regulatory.db file.  One way to avoid this would
> > be to add an LSM specific to the regulatory db
> 
> Casey already commented on this suggestion.

Sorry but I must have missed this, can you send me the email or URL where he did that?
I never got a copy of that email I think.

  Luis

  reply	other threads:[~2018-05-10 23:26 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-01 13:48 [PATCH 0/6] firmware: kernel signature verification Mimi Zohar
2018-05-01 13:48 ` [PATCH 1/6] firmware: permit LSMs and IMA to fail firmware sysfs fallback loading Mimi Zohar
2018-05-04  0:02   ` Luis R. Rodriguez
2018-05-04  0:36     ` Mimi Zohar
2018-05-01 13:48 ` [PATCH 2/6] ima: prevent sysfs fallback firmware loading Mimi Zohar
2018-05-04  0:06   ` Luis R. Rodriguez
2018-05-01 13:48 ` [PATCH 3/6] firmware: differentiate between signed regulatory.db and other firmware Mimi Zohar
2018-05-04  0:07   ` Luis R. Rodriguez
2018-05-04  0:24     ` Mimi Zohar
2018-05-08 17:34       ` Luis R. Rodriguez
2018-05-09 11:30         ` Mimi Zohar
2018-05-09 19:15           ` Luis R. Rodriguez
2018-05-09 19:57             ` Mimi Zohar
2018-05-09 21:22               ` Luis R. Rodriguez
2018-05-09 22:06                 ` Mimi Zohar
2018-05-09 23:48                   ` Luis R. Rodriguez
2018-05-10  2:00                     ` Mimi Zohar
2018-05-10 23:26                       ` Luis R. Rodriguez [this message]
2018-05-11  5:00                         ` Mimi Zohar
2018-05-11 21:52                           ` Luis R. Rodriguez
2018-05-14 12:58                             ` Mimi Zohar
2018-05-14 19:28                               ` Luis R. Rodriguez
2018-05-15  2:02                                 ` Mimi Zohar
2018-05-15  3:26                                   ` Luis R. Rodriguez
2018-05-15 12:32                                     ` Josh Boyer
2018-05-15 12:43                                       ` Mimi Zohar
2018-05-01 13:48 ` [PATCH 4/6] ima: coordinate with signed regulatory.db Mimi Zohar
2018-05-01 13:48 ` [PATCH 5/6] ima: verify kernel firmware signatures when using a preallocated buffer Mimi Zohar
2018-05-01 13:48 ` [RFC PATCH 6/6] ima: prevent loading firmware into a pre-allocated buffer Mimi Zohar
2018-05-04  0:10   ` Luis R. Rodriguez

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