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authorDavid Howells <dhowells@redhat.com>2011-03-07 15:05:59 +0000
committerJames Morris <jmorris@namei.org>2011-03-08 11:17:15 +1100
commitb9fffa3877a3ebbe0a5ad5a247358e2f7df15b24 (patch)
tree0f58a92c2616b3663f88935290d32a4c90d57025 /net/rxrpc/ar-key.c
parentKEYS: Add an RCU payload dereference macro (diff)
downloadlinux-dev-b9fffa3877a3ebbe0a5ad5a247358e2f7df15b24.tar.xz
linux-dev-b9fffa3877a3ebbe0a5ad5a247358e2f7df15b24.zip
KEYS: Add a key type op to permit the key description to be vetted
Add a key type operation to permit the key type to vet the description of a new key that key_alloc() is about to allocate. The operation may reject the description if it wishes with an error of its choosing. If it does this, the key will not be allocated. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'net/rxrpc/ar-key.c')
-rw-r--r--net/rxrpc/ar-key.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
index d763793d39de..43ea7de2fc8e 100644
--- a/net/rxrpc/ar-key.c
+++ b/net/rxrpc/ar-key.c
@@ -25,6 +25,7 @@
#include <keys/user-type.h>
#include "ar-internal.h"
+static int rxrpc_vet_description_s(const char *);
static int rxrpc_instantiate(struct key *, const void *, size_t);
static int rxrpc_instantiate_s(struct key *, const void *, size_t);
static void rxrpc_destroy(struct key *);
@@ -52,6 +53,7 @@ EXPORT_SYMBOL(key_type_rxrpc);
*/
struct key_type key_type_rxrpc_s = {
.name = "rxrpc_s",
+ .vet_description = rxrpc_vet_description_s,
.instantiate = rxrpc_instantiate_s,
.match = user_match,
.destroy = rxrpc_destroy_s,
@@ -59,6 +61,23 @@ struct key_type key_type_rxrpc_s = {
};
/*
+ * Vet the description for an RxRPC server key
+ */
+static int rxrpc_vet_description_s(const char *desc)
+{
+ unsigned long num;
+ char *p;
+
+ num = simple_strtoul(desc, &p, 10);
+ if (*p != ':' || num > 65535)
+ return -EINVAL;
+ num = simple_strtoul(p + 1, &p, 10);
+ if (*p || num < 1 || num > 255)
+ return -EINVAL;
+ return 0;
+}
+
+/*
* parse an RxKAD type XDR format token
* - the caller guarantees we have at least 4 words
*/