[PATCH] eCryptfs: Public key; packet management

Public key support code.  This reads and writes packets in the header that
contain public key encrypted file keys.  It calls the messaging code in the
previous patch to send and receive encryption and decryption request
packets from the userspace daemon.

[akpm@osdl.org: cleab fix]
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
index c22b32fc8e8c..e8ba6278ad2c 100644
--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -243,7 +243,8 @@ unlock:
  * userspace. Returns zero upon delivery to desired context element;
  * non-zero upon delivery failure or error.
  */
-int ecryptfs_process_response(struct ecryptfs_message *msg, pid_t pid, u32 seq)
+int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
+                              pid_t pid, u32 seq)
 {
         struct ecryptfs_daemon_id *id;
         struct ecryptfs_msg_ctx *msg_ctx;
@@ -268,6 +269,13 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, pid_t pid, u32 seq)
                                 msg_ctx->task->euid, pid);
                 goto wake_up;
         }
+        if (msg_ctx->task->euid != uid) {
+                rc = -EBADMSG;
+                ecryptfs_printk(KERN_WARNING, "Received message from user "
+                                "[%d]; expected message from user [%d]\n",
+                                uid, msg_ctx->task->euid);
+                goto unlock;
+        }
         if (id->pid != pid) {
                 rc = -EBADMSG;
                 ecryptfs_printk(KERN_ERR, "User [%d] received a "