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

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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 <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: Chris Wright <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: James Morris <[email protected]>
Cc: Kevin Coffman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2008-04-29 01:01:24 -07:00 • committed by Linus Torvalds
commit 4a38e122e2
7 changed files with 70 additions and 41 deletions
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14
Documentation/keys.txt
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@ -771,7 +771,7 @@ payload contents" for more information.
struct key *request_key(const struct key_type *type,
const char *description,
const char *callout_string);
const char *callout_info);
This is used to request a key or keyring with a description that matches
the description specified according to the key type's match function. This
@ -793,24 +793,28 @@ payload contents" for more information.
struct key *request_key_with_auxdata(const struct key_type *type,
const char *description,
const char *callout_string,
const void *callout_info,
size_t callout_len,
void *aux);
This is identical to request_key(), except that the auxiliary data is
passed to the key_type->request_key() op if it exists.
passed to the key_type->request_key() op if it exists, and the callout_info
is a blob of length callout_len, if given (the length may be 0).
(*) A key can be requested asynchronously by calling one of:
struct key *request_key_async(const struct key_type *type,
const char *description,
const char *callout_string);
const void *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);
which are asynchronous equivalents of request_key() and