From: Fan Wu <wufan@linux.microsoft.com>
To: corbet@lwn.net, zohar@linux.ibm.com, jmorris@namei.org,
serge@hallyn.com, tytso@mit.edu, ebiggers@kernel.org,
axboe@kernel.dk, agk@redhat.com, snitzer@kernel.org,
eparis@redhat.com, paul@paul-moore.com
Cc: linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org, fsverity@lists.linux.dev,
linux-block@vger.kernel.org, dm-devel@lists.linux.dev,
audit@vger.kernel.org, linux-kernel@vger.kernel.org,
Fan Wu <wufan@linux.microsoft.com>
Subject: [RFC PATCH v15 16/21] security: add security_inode_setintegrity() hook
Date: Fri, 15 Mar 2024 20:35:46 -0700 [thread overview]
Message-ID: <1710560151-28904-17-git-send-email-wufan@linux.microsoft.com> (raw)
In-Reply-To: <1710560151-28904-1-git-send-email-wufan@linux.microsoft.com>
This patch introduces a new hook to save inode's integrity
data. For example, for fsverity enabled files, LSMs can use this hook to save
the verified fsverity builtin signature into the inode's security blob,
and LSMs can make access decisions based on the data inside the signature,
like the signer certificate.
Signed-off-by: Fan Wu <wufan@linux.microsoft.com>
--
v1-v14:
+ Not present
v15:
+ Introduced
---
include/linux/lsm_hook_defs.h | 3 +++
include/linux/security.h | 10 ++++++++++
security/security.c | 28 ++++++++++++++++++++++++++++
3 files changed, 41 insertions(+)
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 6808ae763913..c88587fc3691 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -177,6 +177,9 @@ LSM_HOOK(int, 0, inode_listsecurity, struct inode *inode, char *buffer,
LSM_HOOK(void, LSM_RET_VOID, inode_getsecid, struct inode *inode, u32 *secid)
LSM_HOOK(int, 0, inode_copy_up, struct dentry *src, struct cred **new)
LSM_HOOK(int, -EOPNOTSUPP, inode_copy_up_xattr, const char *name)
+LSM_HOOK(int, 0, inode_setintegrity, struct inode *inode,
+ enum lsm_intgr_type type, const void *value, size_t size)
+
LSM_HOOK(int, 0, kernfs_init_security, struct kernfs_node *kn_dir,
struct kernfs_node *kn)
LSM_HOOK(int, 0, file_permission, struct file *file, int mask)
diff --git a/include/linux/security.h b/include/linux/security.h
index 60b40b523d57..0885866b261e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -405,6 +405,9 @@ int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer
void security_inode_getsecid(struct inode *inode, u32 *secid);
int security_inode_copy_up(struct dentry *src, struct cred **new);
int security_inode_copy_up_xattr(const char *name);
+int security_inode_setintegrity(struct inode *inode,
+ enum lsm_intgr_type type, const void *value,
+ size_t size);
int security_kernfs_init_security(struct kernfs_node *kn_dir,
struct kernfs_node *kn);
int security_file_permission(struct file *file, int mask);
@@ -1021,6 +1024,13 @@ static inline int security_inode_copy_up(struct dentry *src, struct cred **new)
return 0;
}
+static inline int security_inode_setintegrity(struct inode *inode,
+ enum lsm_intgr_type, type,
+ const void *value, size_t size)
+{
+ return 0;
+}
+
static inline int security_kernfs_init_security(struct kernfs_node *kn_dir,
struct kernfs_node *kn)
{
diff --git a/security/security.c b/security/security.c
index 8d88529ac904..c5d426d084ab 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2681,6 +2681,34 @@ int security_inode_copy_up_xattr(const char *name)
}
EXPORT_SYMBOL(security_inode_copy_up_xattr);
+/**
+ * security_inode_setintegrity() - Set the inode's integrity data
+ * @inode: inode
+ * @type: type of integrity, e.g. hash digest, signature, etc
+ * @value: the integrity value
+ * @size: size of the integrity value
+ *
+ * Register a verified integrity measurement of a inode with the LSM.
+ *
+ * Return: Returns 0 on success, negative values on failure.
+ */
+int security_inode_setintegrity(struct inode *inode,
+ enum lsm_intgr_type type, const void *value,
+ size_t size)
+{
+ int rc = 0;
+ struct security_hook_list *p;
+
+ hlist_for_each_entry(p, &security_hook_heads.inode_setintegrity, list) {
+ rc = p->hook.inode_setintegrity(inode, type, value, size);
+ if (rc)
+ return rc;
+ }
+
+ return LSM_RET_DEFAULT(inode_setintegrity);
+}
+EXPORT_SYMBOL(security_inode_setintegrity);
+
/**
* security_kernfs_init_security() - Init LSM context for a kernfs node
* @kn_dir: parent kernfs node
--
2.44.0
next prev parent reply other threads:[~2024-03-16 3:35 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-16 3:35 [RFC PATCH v15 00/21] Integrity Policy Enforcement LSM (IPE) Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 01/21] security: add ipe lsm Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 02/21] ipe: add policy parser Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 03/21] ipe: add evaluation loop Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 04/21] ipe: add LSM hooks on execution and kernel read Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 05/21] initramfs|security: Add a security hook to do_populate_rootfs() Fan Wu
2024-03-18 0:29 ` Casey Schaufler
2024-03-18 1:58 ` Paul Moore
2024-03-16 3:35 ` [RFC PATCH v15 06/21] ipe: introduce 'boot_verified' as a trust provider Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 07/21] security: add new securityfs delete function Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 08/21] ipe: add userspace interface Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 09/21] uapi|audit|ipe: add ipe auditing support Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 10/21] ipe: add permissive toggle Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 11/21] block|security: add LSM blob to block_device Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 12/21] security: add security_bdev_setintegrity() hook Fan Wu
2024-03-19 23:00 ` [PATCH RFC " Paul Moore
2024-03-20 8:28 ` Jarkko Sakkinen
2024-03-20 8:31 ` Jarkko Sakkinen
2024-03-20 20:31 ` Fan Wu
2024-03-21 17:25 ` Jarkko Sakkinen
2024-03-16 3:35 ` [RFC PATCH v15 13/21] dm: add finalize hook to target_type Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 14/21] dm verity: consume root hash digest and signature data via LSM hook Fan Wu
2024-03-19 23:00 ` [PATCH RFC " Paul Moore
2024-03-20 2:19 ` Mike Snitzer
2024-03-20 17:23 ` Paul Moore
2024-03-20 18:49 ` Mike Snitzer
2024-03-20 17:56 ` Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 15/21] ipe: add support for dm-verity as a trust provider Fan Wu
2024-03-16 3:35 ` Fan Wu [this message]
2024-03-19 23:00 ` [PATCH RFC v15 16/21] security: add security_inode_setintegrity() hook Paul Moore
2024-03-16 3:35 ` [RFC PATCH v15 17/21] fsverity: consume builtin signature via LSM hook Fan Wu
2024-03-18 5:29 ` Eric Biggers
2024-03-19 23:00 ` Paul Moore
2024-03-16 3:35 ` [RFC PATCH v15 18/21] ipe: enable support for fs-verity as a trust provider Fan Wu
2024-03-18 5:17 ` Eric Biggers
2024-03-18 8:08 ` Roberto Sassu
2024-03-18 20:58 ` Fan Wu
2024-03-18 20:40 ` Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 19/21] scripts: add boot policy generation program Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 20/21] ipe: kunit test for parser Fan Wu
2024-03-16 3:35 ` [RFC PATCH v15 21/21] documentation: add ipe documentation Fan Wu
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