keys: allow the callout data to be passed as a blob rather than a string

Allow the callout data to be passed as a blob rather than a string for
internal kernel services that call any request_key_*() interface other than
request_key().  request_key() itself still takes a NUL-terminated string.

The functions that change are:

	request_key_with_auxdata()
	request_key_async()
	request_key_async_with_auxdata()

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Paul Moore <paul.moore@hp.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Cc: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/Documentation/keys-request-key.txt b/Documentation/keys-request-key.txt
index 266955d23ee6..09b55e461740 100644
--- a/Documentation/keys-request-key.txt
+++ b/Documentation/keys-request-key.txt
@@ -11,26 +11,29 @@ request_key*():
 
         struct key *request_key(const struct key_type *type,
                                 const char *description,
-                                const char *callout_string);
+                                const char *callout_info);
 
 or:
 
         struct key *request_key_with_auxdata(const struct key_type *type,
                                              const char *description,
-                                             const char *callout_string,
+                                             const char *callout_info,
+                                             size_t callout_len,
                                              void *aux);
 
 or:
 
         struct key *request_key_async(const struct key_type *type,
                                       const char *description,
-                                      const char *callout_string);
+                                      const char *callout_info,
+                                      size_t callout_len);
 
 or:
 
         struct key *request_key_async_with_auxdata(const struct key_type *type,
                                                    const char *description,
-                                                   const char *callout_string,
+                                                   const char *callout_info,
+                                                   size_t callout_len,
                                                    void *aux);
 
 Or by userspace invoking the request_key system call: