[PATCH] Capture selinux subject/object context information.

This patch extends existing audit records with subject/object context
information. Audit records associated with filesystem inodes, ipc, and
tasks now contain SELinux label information in the field "subj" if the
item is performing the action, or in "obj" if the item is the receiver
of an action.

These labels are collected via hooks in SELinux and appended to the
appropriate record in the audit code.

This additional information is required for Common Criteria Labeled
Security Protection Profile (LSPP).

[AV: fixed kmalloc flags use]
[folded leak fixes]
[folded cleanup from akpm (kfree(NULL)]
[folded audit_inode_context() leak fix]
[folded akpm's fix for audit_ipc_perm() definition in case of !CONFIG_AUDIT]

Signed-off-by: Dustin Kirkland <dustin.kirkland@us.ibm.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index 7cbef482e13a..ec0bbbc3ffc2 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -869,6 +869,11 @@ struct swap_info_struct;
  *	@ipcp contains the kernel IPC permission structure
  *	@flag contains the desired (requested) permission set
  *	Return 0 if permission is granted.
+ * @ipc_getsecurity:
+ *      Copy the security label associated with the ipc object into
+ *      @buffer.  @buffer may be NULL to request the size of the buffer 
+ *      required.  @size indicates the size of @buffer in bytes. Return 
+ *      number of bytes used/required on success.
  *
  * Security hooks for individual messages held in System V IPC message queues
  * @msg_msg_alloc_security:
@@ -1168,6 +1173,7 @@ 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);
   	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);
@@ -1217,6 +1223,7 @@ struct security_operations {
 	void (*task_to_inode)(struct task_struct *p, struct inode *inode);
 
 	int (*ipc_permission) (struct kern_ipc_perm * ipcp, short flag);
+	int (*ipc_getsecurity)(struct kern_ipc_perm *ipcp, void *buffer, size_t size);
 
 	int (*msg_msg_alloc_security) (struct msg_msg * msg);
 	void (*msg_msg_free_security) (struct msg_msg * msg);
@@ -1674,6 +1681,11 @@ static inline int security_inode_removexattr (struct dentry *dentry, char *name)
 	return security_ops->inode_removexattr (dentry, name);
 }
 
+static inline const char *security_inode_xattr_getsuffix(void)
+{
+	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)
 {
 	if (unlikely (IS_PRIVATE (inode)))
@@ -1869,6 +1881,11 @@ static inline int security_ipc_permission (struct kern_ipc_perm *ipcp,
 	return security_ops->ipc_permission (ipcp, flag);
 }
 
+static inline int security_ipc_getsecurity(struct kern_ipc_perm *ipcp, void *buffer, size_t size)
+{
+	return security_ops->ipc_getsecurity(ipcp, buffer, size);
+}
+
 static inline int security_msg_msg_alloc (struct msg_msg * msg)
 {
 	return security_ops->msg_msg_alloc_security (msg);
@@ -2316,6 +2333,11 @@ static inline int security_inode_removexattr (struct dentry *dentry, char *name)
 	return cap_inode_removexattr(dentry, name);
 }
 
+static inline const char *security_inode_xattr_getsuffix (void)
+{
+	return NULL ;
+}
+
 static inline int security_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size, int err)
 {
 	return -EOPNOTSUPP;
@@ -2499,6 +2521,11 @@ static inline int security_ipc_permission (struct kern_ipc_perm *ipcp,
 	return 0;
 }
 
+static inline int security_ipc_getsecurity(struct kern_ipc_perm *ipcp, void *buffer, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int security_msg_msg_alloc (struct msg_msg * msg)
 {
 	return 0;