linux-kernel - [PATCH ghak59 V2 5/6] audit: kill trees before logging syscall exit for exit/free

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Message-Id: <01b59195f8ff3c2ec32a2251200f588bd537dff1.1532709911.git.rgb@redhat.com>
Date:   Fri, 27 Jul 2018 15:48:16 -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 <viro@...iv.linux.org.uk>,
        Richard Guy Briggs <rgb@...hat.com>
Subject: [PATCH ghak59 V2 5/6] audit: kill trees before logging syscall exit for exit/free

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

Move the kill_trees call before the audit_log_exit call in
__audit_free() and __audit_syscall_exit() so that the user library
doesn't leave out any appended pruned trees CONFIG_CHANGE records due to
the EOE flagging the end of the 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 | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 986c5ce..55fd2a3 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1482,6 +1482,8 @@ void __audit_free(struct task_struct *tsk)
 	if (!context)
 		return;
 
+	if (!list_empty(&context->killed_trees))
+		audit_kill_trees(context);
 	/* Check for system calls that do not go through the exit
 	 * function (e.g., exit_group), then free context block.
 	 * We use GFP_ATOMIC here because we might be doing this
@@ -1489,8 +1491,6 @@ void __audit_free(struct task_struct *tsk)
 	/* that can happen only if we are called from do_exit() */
 	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
 		audit_log_exit(context, tsk);
-	if (!list_empty(&context->killed_trees))
-		audit_kill_trees(context);
 
 	audit_free_context(context);
 }
@@ -1570,15 +1570,14 @@ void __audit_syscall_exit(int success, long return_code)
 	if (!context)
 		return;
 
+	if (!list_empty(&context->killed_trees))
+		audit_kill_trees(context);
 	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
 		audit_log_exit(context, current);
 
 	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