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Subject[PATCH v3 5/6] evm: Align evm_inode_init_security() definition with LSM infrastructure
Date
This patch changes the evm_inode_init_security() definition to align with
the LSM infrastructure, in preparation for moving IMA and EVM to that
infrastructure.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
include/linux/evm.h | 19 ++++++++++++-------
security/integrity/evm/evm_main.c | 19 +++++++++++++------
security/security.c | 6 +++---
3 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/include/linux/evm.h b/include/linux/evm.h
index 8cad46bcec9d..8b1c36c19e97 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -34,9 +34,10 @@ extern int evm_inode_removexattr(struct user_namespace *mnt_userns,
struct dentry *dentry, const char *xattr_name);
extern void evm_inode_post_removexattr(struct dentry *dentry,
const char *xattr_name);
-extern int evm_inode_init_security(struct inode *inode,
- const struct xattr *xattr_array,
- struct xattr *evm);
+extern int evm_inode_init_security(struct inode *inode, struct inode *dir,
+ const struct qstr *qstr,
+ struct xattr *xattrs, int *base_slot,
+ void *fs_data);
extern bool evm_status_revalidate(const char *xattr_name);
#ifdef CONFIG_FS_POSIX_ACL
extern int posix_xattr_acl(const char *xattrname);
@@ -102,11 +103,15 @@ static inline void evm_inode_post_removexattr(struct dentry *dentry,
return;
}

-static inline int evm_inode_init_security(struct inode *inode,
- const struct xattr *xattr_array,
- struct xattr *evm)
+static inline int evm_inode_init_security(struct inode *inode, struct inode *dir,
+ const struct qstr *qstr,
+ struct xattr *xattrs, int *base_slot,
+ void *fs_data)
{
- return 0;
+ if (!xattrs || !xattrs->name)
+ return 0;
+
+ return -EOPNOTSUPP;
}

static inline bool evm_status_revalidate(const char *xattr_name)
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 84a9b7a69b1f..d647bfd0adcd 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -17,6 +17,7 @@
#include <linux/xattr.h>
#include <linux/integrity.h>
#include <linux/evm.h>
+#include <linux/lsm_hooks.h>
#include <linux/magic.h>
#include <linux/posix_acl_xattr.h>

@@ -706,23 +707,29 @@ void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
/*
* evm_inode_init_security - initializes security.evm HMAC value
*/
-int evm_inode_init_security(struct inode *inode,
- const struct xattr *lsm_xattr,
- struct xattr *evm_xattr)
+int evm_inode_init_security(struct inode *inode, struct inode *dir,
+ const struct qstr *qstr,
+ struct xattr *xattrs, int *base_slot,
+ void *fs_data)
{
struct evm_xattr *xattr_data;
+ struct xattr *evm_xattr = lsm_find_xattr_slot(xattrs, base_slot,
+ *base_slot + 1);
int rc;

- if (!(evm_initialized & EVM_INIT_HMAC) ||
- !evm_protected_xattr(lsm_xattr->name))
+ if (!xattrs || !xattrs->name)
return 0;

+ if (!(evm_initialized & EVM_INIT_HMAC) ||
+ !evm_protected_xattr(xattrs->name))
+ return -EOPNOTSUPP;
+
xattr_data = kzalloc(sizeof(*xattr_data), GFP_NOFS);
if (!xattr_data)
return -ENOMEM;

xattr_data->data.type = EVM_XATTR_HMAC;
- rc = evm_init_hmac(inode, lsm_xattr, xattr_data->digest);
+ rc = evm_init_hmac(inode, xattrs, xattr_data->digest);
if (rc < 0)
goto out;

diff --git a/security/security.c b/security/security.c
index 91675003a5cf..f090362550fa 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1103,9 +1103,9 @@ int security_inode_init_security(struct inode *inode, struct inode *dir,
goto out;
}

- ret = evm_inode_init_security(inode, new_xattrs,
- new_xattrs + base_slot);
- if (ret)
+ ret = evm_inode_init_security(inode, dir, qstr, new_xattrs, &base_slot,
+ fs_data);
+ if (ret && ret != -EOPNOTSUPP)
goto out;
ret = initxattrs(inode, new_xattrs, fs_data);
out:
--
2.25.1
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