From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: Stefan Berger <stefanb@linux.ibm.com>,
viro@zeniv.linux.org.uk, brauner@kernel.org,
chuck.lever@oracle.com, jlayton@kernel.org, neilb@suse.de,
kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com,
zohar@linux.ibm.com, dmitry.kasatkin@gmail.com,
paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com,
dhowells@redhat.com, jarkko@kernel.org,
stephen.smalley.work@gmail.com, eparis@parisplace.org,
casey@schaufler-ca.com
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nfs@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
selinux@vger.kernel.org, Roberto Sassu <roberto.sassu@huawei.com>
Subject: Re: [PATCH v3 25/25] integrity: Switch from rbtree to LSM-managed blob for integrity_iint_cache
Date: Fri, 15 Sep 2023 11:39:44 +0200 [thread overview]
Message-ID: <a0913021426ead2fc5e2a3db013335a67cdd4322.camel@huaweicloud.com> (raw)
In-Reply-To: <82486de4-2917-afb6-2ae3-6ea7f1346dc0@linux.ibm.com>
On Tue, 2023-09-12 at 12:19 -0400, Stefan Berger wrote:
> On 9/4/23 09:40, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@huawei.com>
> >
> > Before the security field of kernel objects could be shared among LSMs with
> > the LSM stacking feature, IMA and EVM had to rely on an alternative storage
> > of inode metadata. The association between inode metadata and inode is
> > maintained through an rbtree.
> >
> > With the reservation mechanism offered by the LSM infrastructure, the
> > rbtree is no longer necessary, as each LSM could reserve a space in the
> > security blob for each inode. Thus, request from the 'integrity' LSM a
> > space in the security blob for the pointer of inode metadata
> > (integrity_iint_cache structure).
> >
> > Prefer this to allocating the integrity_iint_cache structure directly, as
> > IMA would require it only for a subset of inodes. Always allocating it
> > would cause a waste of memory.
> >
> > Introduce two primitives for getting and setting the pointer of
> > integrity_iint_cache in the security blob, respectively
> > integrity_inode_get_iint() and integrity_inode_set_iint(). This would make
> > the code more understandable, as they directly replace rbtree operations.
> >
> > Locking is not needed, as access to inode metadata is not shared, it is per
> > inode.
> >
> > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
> > ---
> >
> > @@ -145,10 +91,8 @@ static void integrity_inode_free(struct inode *inode)
> > if (!IS_IMA(inode))
> > return;
>
> I think you can remove this check !IS_IMA() as well since the next
> function called here integrity_iint_find() already has this check:
>
> struct integrity_iint_cache *integrity_iint_find(struct inode *inode)
> {
> if (!IS_IMA(inode))
> return NULL;
>
> return integrity_inode_get_iint(inode);
> }
I agree, thanks!
Roberto
> >
> > - write_lock(&integrity_iint_lock);
> > - iint = __integrity_iint_find(inode);
> > - rb_erase(&iint->rb_node, &integrity_iint_tree);
> > - write_unlock(&integrity_iint_lock);
> > + iint = integrity_iint_find(inode); <--------------
> > + integrity_inode_set_iint(inode, NULL);
> >
> > iint_free(iint);
> > }
next prev parent reply other threads:[~2023-09-15 9:41 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-04 13:33 [PATCH v3 00/25] security: Move IMA and EVM to the LSM infrastructure Roberto Sassu
2023-09-04 13:33 ` [PATCH v3 01/25] ima: Align ima_inode_post_setattr() definition with " Roberto Sassu
2023-10-11 14:26 ` Mimi Zohar
2023-09-04 13:33 ` [PATCH v3 02/25] ima: Align ima_post_path_mknod() " Roberto Sassu
2023-09-05 17:23 ` Stefan Berger
2023-10-11 14:38 ` Mimi Zohar
2023-10-11 16:02 ` Roberto Sassu
2023-10-11 19:01 ` Mimi Zohar
2023-10-12 7:29 ` Roberto Sassu
2023-10-12 11:42 ` Mimi Zohar
2023-10-12 12:19 ` Roberto Sassu
2023-10-12 13:25 ` Mimi Zohar
2023-10-12 13:33 ` Roberto Sassu
2023-10-12 17:10 ` Mimi Zohar
2023-10-13 7:38 ` Roberto Sassu
2023-09-04 13:33 ` [PATCH v3 03/25] ima: Align ima_post_create_tmpfile() " Roberto Sassu
2023-09-05 17:26 ` Stefan Berger
2023-09-04 13:33 ` [PATCH v3 04/25] ima: Align ima_file_mprotect() " Roberto Sassu
2023-10-11 14:51 ` Mimi Zohar
2023-10-11 15:43 ` Roberto Sassu
2023-10-11 20:17 ` Mimi Zohar
2023-09-04 13:33 ` [PATCH v3 05/25] ima: Align ima_inode_setxattr() " Roberto Sassu
2023-10-11 19:20 ` Mimi Zohar
2023-09-04 13:33 ` [PATCH v3 06/25] ima: Align ima_inode_removexattr() " Roberto Sassu
2023-09-04 13:33 ` [PATCH v3 07/25] ima: Align ima_post_read_file() " Roberto Sassu
2023-10-12 0:07 ` Mimi Zohar
2023-09-04 13:33 ` [PATCH v3 08/25] evm: Align evm_inode_post_setattr() " Roberto Sassu
2023-10-12 0:07 ` Mimi Zohar
2023-09-04 13:33 ` [PATCH v3 09/25] evm: Align evm_inode_setxattr() " Roberto Sassu
2023-10-12 0:08 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 10/25] evm: Align evm_inode_post_setxattr() " Roberto Sassu
2023-10-12 0:08 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 11/25] security: Align inode_setattr hook definition with EVM Roberto Sassu
2023-10-12 0:08 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 12/25] security: Introduce inode_post_setattr hook Roberto Sassu
2023-09-05 17:40 ` Stefan Berger
2023-09-26 11:14 ` Roberto Sassu
2023-10-12 0:08 ` Mimi Zohar
2023-10-12 7:42 ` Roberto Sassu
2023-10-12 11:43 ` Mimi Zohar
2023-10-12 12:25 ` Roberto Sassu
2023-09-04 13:34 ` [PATCH v3 13/25] security: Introduce inode_post_removexattr hook Roberto Sassu
2023-09-05 17:55 ` Stefan Berger
2023-10-12 0:09 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 14/25] security: Introduce file_post_open hook Roberto Sassu
2023-09-05 18:10 ` Stefan Berger
2023-10-12 12:36 ` Mimi Zohar
2023-10-12 12:45 ` Roberto Sassu
2023-10-12 13:35 ` Mimi Zohar
2023-10-12 13:49 ` Roberto Sassu
2023-09-04 13:34 ` [PATCH v3 15/25] security: Introduce file_pre_free_security hook Roberto Sassu
2023-09-05 18:36 ` Stefan Berger
2023-10-13 13:50 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 16/25] security: Introduce path_post_mknod hook Roberto Sassu
2023-09-05 18:48 ` Stefan Berger
2023-10-13 13:12 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 17/25] security: Introduce inode_post_create_tmpfile hook Roberto Sassu
2023-09-05 18:52 ` Stefan Berger
2023-10-13 13:18 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 18/25] security: Introduce inode_post_set_acl hook Roberto Sassu
2023-09-05 19:00 ` Stefan Berger
2023-10-13 13:27 ` Mimi Zohar
2023-09-04 13:34 ` [PATCH v3 19/25] security: Introduce inode_post_remove_acl hook Roberto Sassu
2023-09-05 19:01 ` Stefan Berger
2023-09-04 13:40 ` [PATCH v3 20/25] security: Introduce key_post_create_or_update hook Roberto Sassu
2023-09-05 19:04 ` Stefan Berger
2023-09-26 11:15 ` Roberto Sassu
2023-10-13 13:37 ` Mimi Zohar
2023-09-04 13:40 ` [PATCH v3 21/25] ima: Move to LSM infrastructure Roberto Sassu
2023-09-05 19:17 ` Stefan Berger
2023-10-13 16:55 ` Mimi Zohar
2023-09-04 13:40 ` [PATCH v3 22/25] ima: Move IMA-Appraisal " Roberto Sassu
2023-09-05 20:54 ` Stefan Berger
2023-09-04 13:40 ` [PATCH v3 23/25] evm: Move " Roberto Sassu
2023-09-04 13:40 ` [PATCH v3 24/25] integrity: Move integrity functions to the " Roberto Sassu
2023-09-04 13:40 ` [PATCH v3 25/25] integrity: Switch from rbtree to LSM-managed blob for integrity_iint_cache Roberto Sassu
2023-09-12 16:19 ` Stefan Berger
2023-09-15 9:39 ` Roberto Sassu [this message]
2023-10-13 11:31 ` Roberto Sassu
2023-10-13 19:45 ` [PATCH v3 00/25] security: Move IMA and EVM to the LSM infrastructure Mimi Zohar
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