d_path: Use struct path in struct avc_audit_data

audit_log_d_path() is a d_path() wrapper that is used by the audit code.  To
use a struct path in audit_log_d_path() I need to embed it into struct
avc_audit_data.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Acked-by: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Neil Brown <neilb@suse.de>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 17 insertions, 23 deletions

diff --git a/kernel/audit.c b/kernel/audit.c
index c8555b1..783e657 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1312,26 +1312,26 @@ void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
 
 /* This is a helper-function to print the escaped d_path */
 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
-		      struct dentry *dentry, struct vfsmount *vfsmnt)
+		      struct path *path)
 {
-	char *p, *path;
+	char *p, *pathname;
 
 	if (prefix)
 		audit_log_format(ab, " %s", prefix);
 
 	/* We will allow 11 spaces for ' (deleted)' to be appended */
-	path = kmalloc(PATH_MAX+11, ab->gfp_mask);
-	if (!path) {
+	pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
+	if (!pathname) {
 		audit_log_format(ab, "<no memory>");
 		return;
 	}
-	p = d_path(dentry, vfsmnt, path, PATH_MAX+11);
+	p = d_path(path->dentry, path->mnt, pathname, PATH_MAX+11);
 	if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
 		/* FIXME: can we save some information here? */
 		audit_log_format(ab, "<too long>");
 	} else
 		audit_log_untrustedstring(ab, p);
-	kfree(path);
+	kfree(pathname);
 }
 
 /**
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 741291a..ac6d9b2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -208,8 +208,7 @@ struct audit_context {
 	int		    name_count;
 	struct audit_names  names[AUDIT_NAMES];
 	char *		    filterkey;	/* key for rule that triggered record */
-	struct dentry *	    pwd;
-	struct vfsmount *   pwdmnt;
+	struct path	    pwd;
 	struct audit_context *previous; /* For nested syscalls */
 	struct audit_aux_data *aux;
 	struct audit_aux_data *aux_pids;
@@ -786,12 +785,9 @@ static inline void audit_free_names(struct audit_context *context)
 			__putname(context->names[i].name);
 	}
 	context->name_count = 0;
-	if (context->pwd)
-		dput(context->pwd);
-	if (context->pwdmnt)
-		mntput(context->pwdmnt);
-	context->pwd = NULL;
-	context->pwdmnt = NULL;
+	path_put(&context->pwd);
+	context->pwd.dentry = NULL;
+	context->pwd.mnt = NULL;
 }
 
 static inline void audit_free_aux(struct audit_context *context)
@@ -930,8 +926,7 @@ static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk
 			if ((vma->vm_flags & VM_EXECUTABLE) &&
 			    vma->vm_file) {
 				audit_log_d_path(ab, "exe=",
-						 vma->vm_file->f_path.dentry,
-						 vma->vm_file->f_path.mnt);
+						 &vma->vm_file->f_path);
 				break;
 			}
 			vma = vma->vm_next;
@@ -1341,10 +1336,10 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 				  context->target_sid, context->target_comm))
 			call_panic = 1;
 
-	if (context->pwd && context->pwdmnt) {
+	if (context->pwd.dentry && context->pwd.mnt) {
 		ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
 		if (ab) {
-			audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt);
+			audit_log_d_path(ab, "cwd=", &context->pwd);
 			audit_log_end(ab);
 		}
 	}
@@ -1367,8 +1362,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 			case 0:
 				/* name was specified as a relative path and the
 				 * directory component is the cwd */
-				audit_log_d_path(ab, " name=", context->pwd,
-						 context->pwdmnt);
+				audit_log_d_path(ab, " name=", &context->pwd);
 				break;
 			default:
 				/* log the name's directory component */
@@ -1695,10 +1689,10 @@ void __audit_getname(const char *name)
 	context->names[context->name_count].ino  = (unsigned long)-1;
 	context->names[context->name_count].osid = 0;
 	++context->name_count;
-	if (!context->pwd) {
+	if (!context->pwd.dentry) {
 		read_lock(&current->fs->lock);
-		context->pwd = dget(current->fs->pwd.dentry);
-		context->pwdmnt = mntget(current->fs->pwd.mnt);
+		context->pwd = current->fs->pwd;
+		path_get(&current->fs->pwd);
 		read_unlock(&current->fs->lock);
 	}