[PATCH] update of IPC audit record cleanup

The following patch addresses most of the issues with the IPC_SET_PERM
records as described in:
https://www.redhat.com/archives/linux-audit/2006-May/msg00010.html
and addresses the comments I received on the record field names.

To summarize, I made the following changes:

1. Changed sys_msgctl() and semctl_down() so that an IPC_SET_PERM
   record is emitted in the failure case as well as the success case.
   This matches the behavior in sys_shmctl().  I could simplify the
   code in sys_msgctl() and semctl_down() slightly but it would mean
   that in some error cases we could get an IPC_SET_PERM record
   without an IPC record and that seemed odd.

2. No change to the IPC record type, given no feedback on the backward
   compatibility question.

3. Removed the qbytes field from the IPC record.  It wasn't being
   set and when audit_ipc_obj() is called from ipcperms(), the
   information isn't available.  If we want the information in the IPC
   record, more extensive changes will be necessary.  Since it only
   applies to message queues and it isn't really permission related, it
   doesn't seem worth it.

4. Removed the obj field from the IPC_SET_PERM record.  This means that
   the kern_ipc_perm argument is no longer needed.

5. Removed the spaces and renamed the IPC_SET_PERM field names.  Replaced iuid and
   igid fields with ouid and ogid in the IPC record.

I tested this with the lspp.22 kernel on an x86_64 box.  I believe it
applies cleanly on the latest kernel.

-- ljk

Signed-off-by: Linda Knippers <linda.knippers@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 17 deletions

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index e4551659ad7..fa4bf962545 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -648,8 +648,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 		case AUDIT_IPC: {
 			struct audit_aux_data_ipcctl *axi = (void *)aux;
 			audit_log_format(ab, 
-				 " qbytes=%lx iuid=%u igid=%u mode=%x",
-				 axi->qbytes, axi->uid, axi->gid, axi->mode);
+				 "ouid=%u ogid=%u mode=%x",
+				 axi->uid, axi->gid, axi->mode);
 			if (axi->osid != 0) {
 				char *ctx = NULL;
 				u32 len;
@@ -667,21 +667,10 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 		case AUDIT_IPC_SET_PERM: {
 			struct audit_aux_data_ipcctl *axi = (void *)aux;
 			audit_log_format(ab,
-				" new qbytes=%lx new iuid=%u new igid=%u new mode=%x",
+				"qbytes=%lx ouid=%u ogid=%u mode=%x",
 				axi->qbytes, axi->uid, axi->gid, axi->mode);
-			if (axi->osid != 0) {
-				char *ctx = NULL;
-				u32 len;
-				if (selinux_ctxid_to_string(
-						axi->osid, &ctx, &len)) {
-					audit_log_format(ab, " osid=%u",
-							axi->osid);
-					call_panic = 1;
-				} else
-					audit_log_format(ab, " obj=%s", ctx);
-				kfree(ctx);
-			}
 			break; }
+
 		case AUDIT_EXECVE: {
 			struct audit_aux_data_execve *axi = (void *)aux;
 			int i;
@@ -1232,7 +1221,7 @@ int audit_ipc_obj(struct kern_ipc_perm *ipcp)
  *
  * Returns 0 for success or NULL context or < 0 on error.
  */
-int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp)
+int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
 {
 	struct audit_aux_data_ipcctl *ax;
 	struct audit_context *context = current->audit_context;
@@ -1248,7 +1237,6 @@ int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode,
 	ax->uid = uid;
 	ax->gid = gid;
 	ax->mode = mode;
-	selinux_get_ipc_sid(ipcp, &ax->osid);
 
 	ax->d.type = AUDIT_IPC_SET_PERM;
 	ax->d.next = context->aux;