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[PATCH 1/1] audit: misc bug and warning fixes



From: Dustin Kirkland <dustin kirkland us ibm com>
Subject: [PATCH 1/1] audit: misc bug and warning fixes

This patch fixes a couple of bugs revealed in new features recently added to -mm1:
* fixes warnings due to inconsistent use of const struct inode *inode
* fixes bug that prevent a kernel from booting with audit on, and SELinux off
  due to a missing function in security/dummy.c
* fixes a bug that throws spurious audit_panic() messages due to a missing return
  just before an error_path label
* some reasonable house cleaning in audit_ipc_context(), audit_inode_context(), and
  audit_log_task_context()


Signed-off-by: Dustin Kirkland <dustin kirkland us ibm com>

---

David-

This is a patch freshly generated against your current git tree.  This
patch incorporates several minor changes that I've put on the list in
the past week (though not in canonical patch format).  Once you give
this a look over, I'd appreciate you merging into your git tree soon.

Thanks,
:-Dustin


diff --git a/include/linux/security.h b/include/linux/security.h
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1121,8 +1121,8 @@ struct security_operations {
 	int (*inode_getxattr) (struct dentry *dentry, char *name);
 	int (*inode_listxattr) (struct dentry *dentry);
 	int (*inode_removexattr) (struct dentry *dentry, char *name);
-	char *(*inode_xattr_getsuffix) (void);
-  	int (*inode_getsecurity)(struct inode *inode, const char *name, void *buffer, size_t size, int err);
+	const char *(*inode_xattr_getsuffix) (void);
+  	int (*inode_getsecurity)(const struct inode *inode, const char *name, void *buffer, size_t size, int err);
   	int (*inode_setsecurity)(struct inode *inode, const char *name, const void *value, size_t size, int flags);
   	int (*inode_listsecurity)(struct inode *inode, char *buffer, size_t buffer_size);
 
@@ -1628,7 +1628,7 @@ static inline const char *security_inode
 	return security_ops->inode_xattr_getsuffix();
 }
 
-static inline int security_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err)
+static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
 {
 	if (unlikely (IS_PRIVATE (inode)))
 		return 0;
@@ -2280,7 +2280,7 @@ static inline const char *security_inode
 	return NULL ;
 }
 
-static inline int security_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err)
+static inline int security_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -888,21 +888,20 @@ static void audit_log_task_context(struc
 	}
 
 	ctx = kmalloc(len, GFP_KERNEL);
-	if (!ctx) {
+	if (!ctx)
 		goto error_path;
-		return;
-	}
 
 	len = security_getprocattr(current, "current", ctx, len);
 	if (len < 0 )
 		goto error_path;
 
 	audit_log_format(ab, " subj=%s", ctx);
+	return;
 
 error_path:
 	if (ctx)
 		kfree(ctx);
-	audit_panic("security_getprocattr error in audit_log_task_context");
+	audit_panic("error in audit_log_task_context");
 	return;
 }
 
@@ -1301,13 +1300,16 @@ void audit_putname(const char *name)
 void audit_inode_context(int idx, const struct inode *inode)
 {
 	struct audit_context *context = current->audit_context;
+	const char *suffix = security_inode_xattr_getsuffix();
 	char *ctx = NULL;
 	int len = 0;
 
-	if (!security_inode_xattr_getsuffix())
-		return;
+	if (!suffix)
+		goto ret;
 
-	len = security_inode_getsecurity(inode, (char *)security_inode_xattr_getsuffix(), NULL, 0, 0);
+	len = security_inode_getsecurity(inode, suffix, NULL, 0, 0);
+	if (len == -EOPNOTSUPP)
+		goto ret;
 	if (len < 0) 
 		goto error_path;
 
@@ -1315,17 +1317,18 @@ void audit_inode_context(int idx, const 
 	if (!ctx) 
 		goto error_path;
 
-	len = security_inode_getsecurity(inode, (char *)security_inode_xattr_getsuffix(), ctx, len, 0);
+	len = security_inode_getsecurity(inode, suffix, ctx, len, 0);
 	if (len < 0)
 		goto error_path;
 
 	context->names[idx].ctx = ctx;
-	return;
+	goto ret;
 
 error_path:
 	if (ctx)
 		kfree(ctx);
 	audit_panic("error in audit_inode_context");
+ret:
 	return;
 }
 
@@ -1555,6 +1558,8 @@ char *audit_ipc_context(struct kern_ipc_
 		return NULL;
 
 	len = security_ipc_getsecurity(ipcp, NULL, 0);
+	if (len == -EOPNOTSUPP)
+		goto ret;
 	if (len < 0)
 		goto error_path;
 
@@ -1571,6 +1576,7 @@ char *audit_ipc_context(struct kern_ipc_
 error_path:
 	kfree(ctx);
 	audit_panic("error in audit_ipc_context");
+ret:
 	return NULL;
 }
 
diff --git a/security/dummy.c b/security/dummy.c
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -377,7 +377,7 @@ static int dummy_inode_removexattr (stru
 	return 0;
 }
 
-static int dummy_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err)
+static int dummy_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
 {
 	return -EOPNOTSUPP;
 }
@@ -392,6 +392,11 @@ static int dummy_inode_listsecurity(stru
 	return 0;
 }
 
+static const char *dummy_inode_xattr_getsuffix(void)
+{
+	return NULL;
+}
+
 static int dummy_file_permission (struct file *file, int mask)
 {
 	return 0;
@@ -895,6 +900,7 @@ void security_fixup_ops (struct security
 	set_to_dummy_if_null(ops, inode_getxattr);
 	set_to_dummy_if_null(ops, inode_listxattr);
 	set_to_dummy_if_null(ops, inode_removexattr);
+	set_to_dummy_if_null(ops, inode_xattr_getsuffix);
 	set_to_dummy_if_null(ops, inode_getsecurity);
 	set_to_dummy_if_null(ops, inode_setsecurity);
 	set_to_dummy_if_null(ops, inode_listsecurity);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2273,7 +2273,7 @@ static const char *selinux_inode_xattr_g
  *
  * Permission check is handled by selinux_inode_getxattr hook.
  */
-static int selinux_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err)
+static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
 {
 	struct inode_security_struct *isec = inode->i_security;
 

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