From: Fan Wu <wufan@linux.microsoft.com>
To: Eric Biggers <ebiggers@kernel.org>
Cc: corbet@lwn.net, zohar@linux.ibm.com, jmorris@namei.org,
serge@hallyn.com, tytso@mit.edu, axboe@kernel.dk, agk@redhat.com,
snitzer@kernel.org, eparis@redhat.com, paul@paul-moore.com,
linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fscrypt@vger.kernel.org, linux-block@vger.kernel.org,
dm-devel@redhat.com, linux-audit@redhat.com,
roberto.sassu@huawei.com, linux-kernel@vger.kernel.org,
Deven Bowers <deven.desai@linux.microsoft.com>
Subject: Re: [RFC PATCH v9 12/16] fsverity: consume builtin signature via LSM hook
Date: Thu, 9 Feb 2023 14:21:53 -0800 [thread overview]
Message-ID: <20230209222153.GA6647@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> (raw)
In-Reply-To: <Y+Ro2Uor21d/Gfqc@sol.localdomain>
On Wed, Feb 08, 2023 at 07:30:33PM -0800, Eric Biggers wrote:
> So disregarding the fact that using the fsverity builtin signatures still seems
> like a bad idea to me, here's a few comments on the diff itself:
>
Thanks for the review. I have verified the headers are indeed unnecessary,
I will remove them in the next version.
> On Mon, Jan 30, 2023 at 02:57:27PM -0800, Fan Wu wrote:
> > diff --git a/fs/verity/open.c b/fs/verity/open.c
> > index 81ff94442f7b..7e6fa52c0e9c 100644
> > --- a/fs/verity/open.c
> > +++ b/fs/verity/open.c
> > @@ -7,7 +7,9 @@
> >
> > #include "fsverity_private.h"
> >
> > +#include <linux/security.h>
> > #include <linux/slab.h>
> > +#include <crypto/public_key.h>
>
> There's no need to include <crypto/public_key.h>.
>
> >
> > + if (err) {
> > + fsverity_err(inode, "Error %d verifying signature", err);
> > + goto out;
> > + }
>
> The above error message is unnecessary because fsverity_verify_signature()
> already prints an error message on failure.
>
> > +
> > + err = security_inode_setsecurity(inode, FS_VERITY_INODE_SEC_NAME, desc->signature,
> > + le32_to_cpu(desc->sig_size), 0);
>
> This runs even if CONFIG_FS_VERITY_BUILTIN_SIGNATURES is disabled. Is that
> really the right behavior?
>
Yes the hook call should better depend on a KCONFIG. After second thought I think it
should depend on CONFIG_IPE_PROP_FS_VERITY, which also indirectly introduces the
dependency on CONFIG_FS_VERITY_BUILTIN_SIGNATURES.
Currently security_inode_setsecurity only allows one LSM to save data with a given name.
In our case IPE will be the only LSM that saves the signature.
I will update this part in the next version.
> Also a nit: please stick to the preferred line length of 80 characters.
> See Documentation/process/coding-style.rst
>
> > diff --git a/fs/verity/signature.c b/fs/verity/signature.c
> > index 143a530a8008..5d7b9496f9c4 100644
> > --- a/fs/verity/signature.c
> > +++ b/fs/verity/signature.c
> > @@ -9,6 +9,7 @@
> >
> > #include <linux/cred.h>
> > #include <linux/key.h>
> > +#include <linux/security.h>
> > #include <linux/slab.h>
> > #include <linux/verification.h>
>
> This change is unnecessary.
>
> > diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
> > index 40f14e5fed9d..29e9888287ba 100644
> > --- a/include/linux/fsverity.h
> > +++ b/include/linux/fsverity.h
> > @@ -254,4 +254,6 @@ static inline bool fsverity_active(const struct inode *inode)
> > return fsverity_get_info(inode) != NULL;
> > }
> >
> > +#define FS_VERITY_INODE_SEC_NAME "fsverity.inode-info"
>
> "inode-info" is very vague. Shouldn't it be named "builtin-sig" or something?
>
> - Eric
I agree this name works better, I will change it to "fsverity.builtin-sig".
-Fan
next prev parent reply other threads:[~2023-02-09 22:21 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-30 22:57 [RFC PATCH v9 00/16] Integrity Policy Enforcement LSM (IPE) Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 01/16] security: add ipe lsm Fan Wu
2023-03-02 19:00 ` Paul Moore
2023-04-06 19:20 ` Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 02/16] ipe: add policy parser Fan Wu
2023-01-31 10:53 ` Roberto Sassu
2023-02-01 22:38 ` Fan Wu
2023-03-02 19:02 ` Paul Moore
2023-04-06 20:00 ` Fan Wu
2023-04-11 19:13 ` Paul Moore
2023-01-30 22:57 ` [RFC PATCH v9 03/16] ipe: add evaluation loop and introduce 'boot_verified' as a trust provider Fan Wu
2023-01-31 10:29 ` Roberto Sassu
2023-01-31 15:49 ` Roberto Sassu
2023-02-10 23:21 ` Fan Wu
2023-03-02 2:33 ` Paul Moore
2023-03-02 19:03 ` Paul Moore
2023-04-10 18:53 ` Fan Wu
2023-04-11 20:32 ` Paul Moore
2023-01-30 22:57 ` [RFC PATCH v9 04/16] security: add new securityfs delete function Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 05/16] ipe: add userspace interface Fan Wu
2023-01-31 10:49 ` Roberto Sassu
2023-02-01 19:46 ` Fan Wu
2023-03-02 19:04 ` Paul Moore
2023-04-10 19:10 ` Fan Wu
2023-04-11 21:45 ` Paul Moore
2023-04-12 23:36 ` Fan Wu
2023-04-13 18:45 ` Paul Moore
2023-04-17 18:06 ` Fan Wu
2023-04-17 20:16 ` Paul Moore
2023-04-17 21:18 ` Fan Wu
2023-04-17 21:31 ` Paul Moore
2023-01-30 22:57 ` [RFC PATCH v9 06/16] ipe: add LSM hooks on execution and kernel read Fan Wu
2023-01-31 12:51 ` Roberto Sassu
2023-02-09 22:42 ` Fan Wu
2023-03-02 19:05 ` Paul Moore
2023-04-10 21:22 ` Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 07/16] uapi|audit|ipe: add ipe auditing support Fan Wu
2023-01-31 12:57 ` Roberto Sassu
2023-01-31 17:10 ` Steve Grubb
2023-03-02 19:05 ` Paul Moore
2023-03-16 22:53 ` Fan Wu
2023-04-11 23:07 ` Paul Moore
2023-04-11 23:21 ` Paul Moore
2023-01-30 22:57 ` [RFC PATCH v9 08/16] ipe: add permissive toggle Fan Wu
2023-03-02 19:06 ` Paul Moore
2023-01-30 22:57 ` [RFC PATCH v9 09/16] block|security: add LSM blob to block_device Fan Wu
2023-01-31 8:53 ` Christoph Hellwig
2023-01-31 23:01 ` Fan Wu
2023-03-02 19:07 ` Paul Moore
2023-01-30 22:57 ` [RFC PATCH v9 10/16] dm-verity: consume root hash digest and signature data via LSM hook Fan Wu
2023-01-31 13:22 ` Roberto Sassu
2023-02-01 23:26 ` Fan Wu
2023-02-02 8:21 ` Roberto Sassu
2023-02-07 23:52 ` Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 11/16] ipe: add support for dm-verity as a trust provider Fan Wu
2023-03-02 19:08 ` Paul Moore
2023-03-16 22:10 ` Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 12/16] fsverity: consume builtin signature via LSM hook Fan Wu
2023-02-09 3:30 ` Eric Biggers
2023-02-09 22:21 ` Fan Wu [this message]
2023-01-30 22:57 ` [RFC PATCH v9 13/16] ipe: enable support for fs-verity as a trust provider Fan Wu
2023-01-31 14:00 ` Roberto Sassu
2023-02-01 23:50 ` Fan Wu
2023-02-02 9:51 ` Roberto Sassu
2023-02-08 0:16 ` Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 14/16] scripts: add boot policy generation program Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 15/16] ipe: kunit test for parser Fan Wu
2023-01-30 22:57 ` [RFC PATCH v9 16/16] documentation: add ipe documentation Fan Wu
2023-01-31 3:59 ` Bagas Sanjaya
2023-02-02 0:19 ` Fan Wu
2023-01-31 14:22 ` [RFC PATCH v9 00/16] Integrity Policy Enforcement LSM (IPE) Roberto Sassu
2023-02-01 0:48 ` Fan Wu
2023-02-02 10:48 ` Roberto Sassu
2023-02-08 0:31 ` Fan Wu
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