integrity: path_check update

- Add support in ima_path_check() for integrity checking without
incrementing the counts. (Required for nfsd.)
- rename and export opencount_get to ima_counts_get
- replace ima_shm_check calls with ima_counts_get
- export ima_path_check

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

2 files changed, 7 insertions, 4 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 998e856..618d6d1 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -130,7 +130,8 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
 				 MAY_READ | MAY_EXEC | MAY_OPEN);
 	if (error)
 		goto exit;
-	error = ima_path_check(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN);
+	error = ima_path_check(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN,
+			       IMA_COUNT_UPDATE);
 	if (error)
 		goto exit;
 
@@ -680,7 +681,7 @@ struct file *open_exec(const char *name)
 	err = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_OPEN);
 	if (err)
 		goto out_path_put;
-	err = ima_path_check(&nd.path, MAY_EXEC | MAY_OPEN);
+	err = ima_path_check(&nd.path, MAY_EXEC | MAY_OPEN, IMA_COUNT_UPDATE);
 	if (err)
 		goto out_path_put;
 
diff --git a/fs/namei.c b/fs/namei.c
index 78f253c..b05a2b1 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -853,7 +853,8 @@ static int __link_path_walk(const char *name, struct nameidata *nd)
 			err = inode_permission(nd->path.dentry->d_inode,
 					       MAY_EXEC);
 		if (!err)
-			err = ima_path_check(&nd->path, MAY_EXEC);
+			err = ima_path_check(&nd->path, MAY_EXEC,
+				             IMA_COUNT_UPDATE);
  		if (err)
 			break;
 
@@ -1515,7 +1516,8 @@ int may_open(struct path *path, int acc_mode, int flag)
 		return error;
 
 	error = ima_path_check(path,
-			       acc_mode & (MAY_READ | MAY_WRITE | MAY_EXEC));
+			       acc_mode & (MAY_READ | MAY_WRITE | MAY_EXEC),
+			       IMA_COUNT_UPDATE);
 	if (error)
 		return error;
 	/*