linux-kernel - [PATCH v9 06/25] evm: Align evm_inode_post_setattr() definition with LSM infrastructure

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Message-Id: <20240115181809.885385-7-roberto.sassu@huaweicloud.com>
Date: Mon, 15 Jan 2024 19:17:50 +0100
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: viro@...iv.linux.org.uk,
	brauner@...nel.org,
	chuck.lever@...cle.com,
	jlayton@...nel.org,
	neilb@...e.de,
	kolga@...app.com,
	Dai.Ngo@...cle.com,
	tom@...pey.com,
	paul@...l-moore.com,
	jmorris@...ei.org,
	serge@...lyn.com,
	zohar@...ux.ibm.com,
	dmitry.kasatkin@...il.com,
	eric.snowberg@...cle.com,
	dhowells@...hat.com,
	jarkko@...nel.org,
	stephen.smalley.work@...il.com,
	eparis@...isplace.org,
	casey@...aufler-ca.com,
	shuah@...nel.org,
	mic@...ikod.net
Cc: linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-integrity@...r.kernel.org,
	keyrings@...r.kernel.org,
	selinux@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Roberto Sassu <roberto.sassu@...wei.com>,
	Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH v9 06/25] evm: Align evm_inode_post_setattr() definition with LSM infrastructure

From: Roberto Sassu <roberto.sassu@...wei.com>

Change evm_inode_post_setattr() definition, so that it can be registered as
implementation of the inode_post_setattr hook (to be introduced).

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
---
 fs/attr.c                         | 2 +-
 include/linux/evm.h               | 6 ++++--
 security/integrity/evm/evm_main.c | 4 +++-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/attr.c b/fs/attr.c
index 9bddc0a6352c..498e673bdf06 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -503,7 +503,7 @@ int notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
 	if (!error) {
 		fsnotify_change(dentry, ia_valid);
 		ima_inode_post_setattr(idmap, dentry, ia_valid);
-		evm_inode_post_setattr(dentry, ia_valid);
+		evm_inode_post_setattr(idmap, dentry, ia_valid);
 	}
 
 	return error;
diff --git a/include/linux/evm.h b/include/linux/evm.h
index 36ec884320d9..5cc386312b5a 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -23,7 +23,8 @@ extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
 					     struct integrity_iint_cache *iint);
 extern int evm_inode_setattr(struct mnt_idmap *idmap,
 			     struct dentry *dentry, struct iattr *attr);
-extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
+extern void evm_inode_post_setattr(struct mnt_idmap *idmap,
+				   struct dentry *dentry, int ia_valid);
 extern int evm_inode_setxattr(struct mnt_idmap *idmap,
 			      struct dentry *dentry, const char *name,
 			      const void *value, size_t size);
@@ -98,7 +99,8 @@ static inline int evm_inode_setattr(struct mnt_idmap *idmap,
 	return 0;
 }
 
-static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+static inline void evm_inode_post_setattr(struct mnt_idmap *idmap,
+					  struct dentry *dentry, int ia_valid)
 {
 	return;
 }
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index cc7956d7878b..ac34f21122cd 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -870,6 +870,7 @@ int evm_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 
 /**
  * evm_inode_post_setattr - update 'security.evm' after modifying metadata
+ * @idmap: idmap of the idmapped mount
  * @dentry: pointer to the affected dentry
  * @ia_valid: for the UID and GID status
  *
@@ -879,7 +880,8 @@ int evm_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
  * This function is called from notify_change(), which expects the caller
  * to lock the inode's i_mutex.
  */
-void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+void evm_inode_post_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+			    int ia_valid)
 {
 	if (!evm_revalidate_status(NULL))
 		return;
-- 
2.34.1