[PATCH] Keys: Pass session keyring to call_usermodehelper()
The attached patch makes it possible to pass a session keyring through to the
process spawned by call_usermodehelper(). This allows patch 3/3 to pass an
authorisation key through to /sbin/request-key, thus permitting better access
controls when doing just-in-time key creation.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/key.h b/include/linux/key.h
index 2c24ffa..2bfbf88 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -273,14 +273,22 @@
extern void key_fsgid_changed(struct task_struct *tsk);
extern void key_init(void);
+#define __install_session_keyring(tsk, keyring) \
+({ \
+ struct key *old_session = tsk->signal->session_keyring; \
+ tsk->signal->session_keyring = keyring; \
+ old_session; \
+})
+
#else /* CONFIG_KEYS */
#define key_validate(k) 0
#define key_serial(k) 0
-#define key_get(k) NULL
+#define key_get(k) ({ NULL; })
#define key_put(k) do { } while(0)
#define alloc_uid_keyring(u) 0
#define switch_uid_keyring(u) do { } while(0)
+#define __install_session_keyring(t, k) ({ NULL; })
#define copy_keys(f,t) 0
#define copy_thread_group_keys(t) 0
#define exit_keys(t) do { } while(0)
