Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates for 3.4 from James Morris:
 "The main addition here is the new Yama security module from Kees Cook,
  which was discussed at the Linux Security Summit last year.  Its
  purpose is to collect miscellaneous DAC security enhancements in one
  place.  This also marks a departure in policy for LSM modules, which
  were previously limited to being standalone access control systems.
  Chromium OS is using Yama, and I believe there are plans for Ubuntu,
  at least.

  This patchset also includes maintenance updates for AppArmor, TOMOYO
  and others."

Fix trivial conflict in <net/sock.h> due to the jumo_label->static_key
rename.

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (38 commits)
  AppArmor: Fix location of const qualifier on generated string tables
  TOMOYO: Return error if fails to delete a domain
  AppArmor: add const qualifiers to string arrays
  AppArmor: Add ability to load extended policy
  TOMOYO: Return appropriate value to poll().
  AppArmor: Move path failure information into aa_get_name and rename
  AppArmor: Update dfa matching routines.
  AppArmor: Minor cleanup of d_namespace_path to consolidate error handling
  AppArmor: Retrieve the dentry_path for error reporting when path lookup fails
  AppArmor: Add const qualifiers to generated string tables
  AppArmor: Fix oops in policy unpack auditing
  AppArmor: Fix error returned when a path lookup is disconnected
  KEYS: testing wrong bit for KEY_FLAG_REVOKED
  TOMOYO: Fix mount flags checking order.
  security: fix ima kconfig warning
  AppArmor: Fix the error case for chroot relative path name lookup
  AppArmor: fix mapping of META_READ to audit and quiet flags
  AppArmor: Fix underflow in xindex calculation
  AppArmor: Fix dropping of allowed operations that are force audited
  AppArmor: Add mising end of structure test to caps unpacking
  ...

1 files changed, 34 insertions, 22 deletions

diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index 9d070a7c3ffc..2daeea4f9266 100644
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -83,31 +83,29 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
                 struct path root;
                 get_fs_root(current->fs, &root);
                 res = __d_path(path, &root, buf, buflen);
-                if (res && !IS_ERR(res)) {
-                        /* everything's fine */
-                        *name = res;
-                        path_put(&root);
-                        goto ok;
-                }
                 path_put(&root);
-                connected = 0;
+        } else {
+                res = d_absolute_path(path, buf, buflen);
+                if (!our_mnt(path->mnt))
+                        connected = 0;
         }
 
-        res = d_absolute_path(path, buf, buflen);
-
-        *name = res;
         /* handle error conditions - and still allow a partial path to
          * be returned.
          */
-        if (IS_ERR(res)) {
-                error = PTR_ERR(res);
-                *name = buf;
-                goto out;
-        }
-        if (!our_mnt(path->mnt))
+        if (!res || IS_ERR(res)) {
                 connected = 0;
+                res = dentry_path_raw(path->dentry, buf, buflen);
+                if (IS_ERR(res)) {
+                        error = PTR_ERR(res);
+                        *name = buf;
+                        goto out;
+                };
+        } else if (!our_mnt(path->mnt))
+                connected = 0;
+
+        *name = res;
 
-ok:
         /* Handle two cases:
          * 1. A deleted dentry && profile is not allowing mediation of deleted
          * 2. On some filesystems, newly allocated dentries appear to the
@@ -138,7 +136,7 @@ ok:
                         /* disconnected path, don't return pathname starting
                          * with '/'
                          */
-                        error = -ESTALE;
+                        error = -EACCES;
                         if (*res == '/')
                                 *name = res + 1;
                 }
@@ -159,7 +157,7 @@ out:
  * Returns: %0 else error on failure
  */
 static int get_name_to_buffer(struct path *path, int flags, char *buffer,
-                              int size, char **name)
+                              int size, char **name, const char **info)
 {
         int adjust = (flags & PATH_IS_DIR) ? 1 : 0;
         int error = d_namespace_path(path, buffer, size - adjust, name, flags);
@@ -171,15 +169,27 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer,
                  */
                 strcpy(&buffer[size - 2], "/");
 
+        if (info && error) {
+                if (error == -ENOENT)
+                        *info = "Failed name lookup - deleted entry";
+                else if (error == -ESTALE)
+                        *info = "Failed name lookup - disconnected path";
+                else if (error == -ENAMETOOLONG)
+                        *info = "Failed name lookup - name too long";
+                else
+                        *info = "Failed name lookup";
+        }
+
         return error;
 }
 
 /**
- * aa_get_name - compute the pathname of a file
+ * aa_path_name - compute the pathname of a file
  * @path: path the file  (NOT NULL)
  * @flags: flags controlling path name generation
  * @buffer: buffer that aa_get_name() allocated  (NOT NULL)
  * @name: Returns - the generated path name if !error (NOT NULL)
+ * @info: Returns - information on why the path lookup failed (MAYBE NULL)
  *
  * @name is a pointer to the beginning of the pathname (which usually differs
  * from the beginning of the buffer), or NULL.  If there is an error @name
@@ -192,7 +202,8 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer,
  *
  * Returns: %0 else error code if could retrieve name
  */
-int aa_get_name(struct path *path, int flags, char **buffer, const char **name)
+int aa_path_name(struct path *path, int flags, char **buffer, const char **name,
+                 const char **info)
 {
         char *buf, *str = NULL;
         int size = 256;
@@ -206,7 +217,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name)
                 if (!buf)
                         return -ENOMEM;
 
-                error = get_name_to_buffer(path, flags, buf, size, &str);
+                error = get_name_to_buffer(path, flags, buf, size, &str, info);
                 if (error != -ENAMETOOLONG)
                         break;
 
@@ -214,6 +225,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name)
                 size <<= 1;
                 if (size > aa_g_path_max)
                         return -ENAMETOOLONG;
+                *info = NULL;
         }
         *buffer = buf;
         *name = str;