1 files changed, 45 insertions, 24 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index d0a28fd1747a..50737c70e78e 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -53,8 +53,9 @@ extern void cap_capset_set(struct task_struct *target, kernel_cap_t *effective,
 extern int cap_bprm_set_security(struct linux_binprm *bprm);
 extern void cap_bprm_apply_creds(struct linux_binprm *bprm, int unsafe);
 extern int cap_bprm_secureexec(struct linux_binprm *bprm);
-extern int cap_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags);
-extern int cap_inode_removexattr(struct dentry *dentry, char *name);
+extern int cap_inode_setxattr(struct dentry *dentry, const char *name,
+                              const void *value, size_t size, int flags);
+extern int cap_inode_removexattr(struct dentry *dentry, const char *name);
 extern int cap_inode_need_killpriv(struct dentry *dentry);
 extern int cap_inode_killpriv(struct dentry *dentry);
 extern int cap_task_post_setuid(uid_t old_ruid, uid_t old_euid, uid_t old_suid, int flags);
@@ -1008,6 +1009,17 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      @perm describes the combination of permissions required of this key.
  *      Return 1 if permission granted, 0 if permission denied and -ve it the
  *      normal permissions model should be effected.
+ * @key_getsecurity:
+ *      Get a textual representation of the security context attached to a key
+ *      for the purposes of honouring KEYCTL_GETSECURITY.  This function
+ *      allocates the storage for the NUL-terminated string and the caller
+ *      should free it.
+ *      @key points to the key to be queried.
+ *      @_buffer points to a pointer that should be set to point to the
+ *       resulting string (if no label or an error occurs).
+ *      Return the length of the string (including terminating NUL) or -ve if
+ *      an error.
+ *      May also return 0 (and a NULL buffer pointer) if there is no label.
  *
  * Security hooks affecting all System V IPC operations.
  *
@@ -1362,13 +1374,13 @@ struct security_operations {
         int (*inode_setattr)    (struct dentry *dentry, struct iattr *attr);
         int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry);
         void (*inode_delete) (struct inode *inode);
-        int (*inode_setxattr) (struct dentry *dentry, char *name, void *value,
-                               size_t size, int flags);
-        void (*inode_post_setxattr) (struct dentry *dentry, char *name, void *value,
-                                     size_t size, int flags);
-        int (*inode_getxattr) (struct dentry *dentry, char *name);
+        int (*inode_setxattr) (struct dentry *dentry, const char *name,
+                               const void *value, size_t size, int flags);
+        void (*inode_post_setxattr) (struct dentry *dentry, const char *name,
+                                     const void *value, size_t size, int flags);
+        int (*inode_getxattr) (struct dentry *dentry, const char *name);
         int (*inode_listxattr) (struct dentry *dentry);
-        int (*inode_removexattr) (struct dentry *dentry, char *name);
+        int (*inode_removexattr) (struct dentry *dentry, const char *name);
         int (*inode_need_killpriv) (struct dentry *dentry);
         int (*inode_killpriv) (struct dentry *dentry);
         int (*inode_getsecurity) (const struct inode *inode, const char *name, void **buffer, bool alloc);
@@ -1469,7 +1481,7 @@ struct security_operations {
         int (*getprocattr) (struct task_struct *p, char *name, char **value);
         int (*setprocattr) (struct task_struct *p, char *name, void *value, size_t size);
         int (*secid_to_secctx) (u32 secid, char **secdata, u32 *seclen);
-        int (*secctx_to_secid) (char *secdata, u32 seclen, u32 *secid);
+        int (*secctx_to_secid) (const char *secdata, u32 seclen, u32 *secid);
         void (*release_secctx) (char *secdata, u32 seclen);
 
 #ifdef CONFIG_SECURITY_NETWORK
@@ -1537,7 +1549,7 @@ struct security_operations {
         int (*key_permission) (key_ref_t key_ref,
                                struct task_struct *context,
                                key_perm_t perm);
-
+        int (*key_getsecurity)(struct key *key, char **_buffer);
 #endif  /* CONFIG_KEYS */
 
 #ifdef CONFIG_AUDIT
@@ -1633,13 +1645,13 @@ int security_inode_permission(struct inode *inode, int mask, struct nameidata *n
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr);
 int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry);
 void security_inode_delete(struct inode *inode);
-int security_inode_setxattr(struct dentry *dentry, char *name,
-                            void *value, size_t size, int flags);
-void security_inode_post_setxattr(struct dentry *dentry, char *name,
-                                  void *value, size_t size, int flags);
-int security_inode_getxattr(struct dentry *dentry, char *name);
+int security_inode_setxattr(struct dentry *dentry, const char *name,
+                            const void *value, size_t size, int flags);
+void security_inode_post_setxattr(struct dentry *dentry, const char *name,
+                                  const void *value, size_t size, int flags);
+int security_inode_getxattr(struct dentry *dentry, const char *name);
 int security_inode_listxattr(struct dentry *dentry);
-int security_inode_removexattr(struct dentry *dentry, char *name);
+int security_inode_removexattr(struct dentry *dentry, const char *name);
 int security_inode_need_killpriv(struct dentry *dentry);
 int security_inode_killpriv(struct dentry *dentry);
 int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc);
@@ -1718,7 +1730,7 @@ int security_setprocattr(struct task_struct *p, char *name, void *value, size_t
 int security_netlink_send(struct sock *sk, struct sk_buff *skb);
 int security_netlink_recv(struct sk_buff *skb, int cap);
 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
-int security_secctx_to_secid(char *secdata, u32 seclen, u32 *secid);
+int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
 void security_release_secctx(char *secdata, u32 seclen);
 
 #else /* CONFIG_SECURITY */
@@ -2041,17 +2053,18 @@ static inline int security_inode_getattr(struct vfsmount *mnt,
 static inline void security_inode_delete(struct inode *inode)
 { }
 
-static inline int security_inode_setxattr(struct dentry *dentry, char *name,
-                                           void *value, size_t size, int flags)
+static inline int security_inode_setxattr(struct dentry *dentry,
+                const char *name, const void *value, size_t size, int flags)
 {
         return cap_inode_setxattr(dentry, name, value, size, flags);
 }
 
-static inline void security_inode_post_setxattr(struct dentry *dentry, char *name,
-                                                 void *value, size_t size, int flags)
+static inline void security_inode_post_setxattr(struct dentry *dentry,
+                const char *name, const void *value, size_t size, int flags)
 { }
 
-static inline int security_inode_getxattr(struct dentry *dentry, char *name)
+static inline int security_inode_getxattr(struct dentry *dentry,
+                        const char *name)
 {
         return 0;
 }
@@ -2061,7 +2074,8 @@ static inline int security_inode_listxattr(struct dentry *dentry)
         return 0;
 }
 
-static inline int security_inode_removexattr(struct dentry *dentry, char *name)
+static inline int security_inode_removexattr(struct dentry *dentry,
+                        const char *name)
 {
         return cap_inode_removexattr(dentry, name);
 }
@@ -2435,7 +2449,7 @@ static inline int security_secid_to_secctx(u32 secid, char **secdata, u32 *secle
         return -EOPNOTSUPP;
 }
 
-static inline int security_secctx_to_secid(char *secdata,
+static inline int security_secctx_to_secid(const char *secdata,
                                            u32 seclen,
                                            u32 *secid)
 {
@@ -2729,6 +2743,7 @@ int security_key_alloc(struct key *key, struct task_struct *tsk, unsigned long f
 void security_key_free(struct key *key);
 int security_key_permission(key_ref_t key_ref,
                             struct task_struct *context, key_perm_t perm);
+int security_key_getsecurity(struct key *key, char **_buffer);
 
 #else
 
@@ -2750,6 +2765,12 @@ static inline int security_key_permission(key_ref_t key_ref,
         return 0;
 }
 
+static inline int security_key_getsecurity(struct key *key, char **_buffer)
+{
+        *_buffer = NULL;
+        return 0;
+}
+
 #endif
 #endif /* CONFIG_KEYS */