linux-kernel - [RFC PATCH ghak59 V1 5/6] audit: move EOE record after kill

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Date:   Thu, 14 Jun 2018 16:21:15 -0400
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     eparis@...isplace.org, Paul Moore <paul@...l-moore.com>,
        Steve Grubb <sgrubb@...hat.com>,
        Alexander Viro <aviro@...hat.com>,
        Richard Guy Briggs <rgb@...hat.com>
Subject: [RFC PATCH ghak59 V1 5/6] audit: move EOE record after kill_trees for exit/free

The EOE record was being issued prior to the pruning of the killed_tree
list.

Move the EOE record creation out of audit_log_exit() and into its
callers __audit_free() and __audit_syscall_exit() so that
audit_kill_trees() can be called prior to the EOE record creation and
any purged trees CONFIG_CHANGE records included in the syscall record
event.

See: https://github.com/linux-audit/audit-kernel/issues/50
See: https://github.com/linux-audit/audit-kernel/issues/59
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 kernel/auditsc.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 2590c9e..d56aead 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1460,10 +1460,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 
 	audit_log_proctitle(tsk, context);
 
-	/* Send end of event record to help user space know we are finished */
-	ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
-	if (ab)
-		audit_log_end(ab);
 	if (call_panic)
 		audit_panic("error converting sid to string");
 }
@@ -1491,6 +1487,14 @@ void __audit_free(struct task_struct *tsk)
 		audit_log_exit(context, tsk);
 	if (!list_empty(&context->killed_trees))
 		audit_kill_trees(context);
+	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) {
+		struct audit_buffer *ab;
+
+		/* Send end of event record to help user space know we are finished */
+		ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
+		if (ab)
+			audit_log_end(ab);
+	}
 
 	audit_free_context(context);
 }
@@ -1572,13 +1576,19 @@ void __audit_syscall_exit(int success, long return_code)
 
 	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
 		audit_log_exit(context, current);
+	if (!list_empty(&context->killed_trees))
+		audit_kill_trees(context);
+	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT) {
+		struct audit_buffer *ab;
 
+		/* Send end of event record to help user space know we are finished */
+		ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
+		if (ab)
+			audit_log_end(ab);
+	}
 	context->in_syscall = 0;
 	context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
 
-	if (!list_empty(&context->killed_trees))
-		audit_kill_trees(context);
-
 	audit_free_names(context);
 	unroll_tree_refs(context, NULL, 0);
 	audit_free_aux(context);
-- 
1.8.3.1