linux-kernel - [RFC PATCH ghak21 2/4] audit: link denied should not directly generate PATH record

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Message-Id: <f48d5d1f1e429e2dee817ae723f9a02a67ed1f3b.1518603831.git.rgb@redhat.com>
Date:   Wed, 14 Feb 2018 11:18:22 -0500
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Eric Paris <eparis@...hat.com>, Paul Moore <paul@...l-moore.com>,
        Steve Grubb <sgrubb@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Richard Guy Briggs <rgb@...hat.com>
Subject: [RFC PATCH ghak21 2/4] audit: link denied should not directly generate PATH record

Audit link denied events generate duplicate PATH records which disagree
in different ways from symlink and hardlink denials.
audit_log_link_denied() should not directly generate PATH records.

See: https://github.com/linux-audit/audit-kernel/issues/21
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 kernel/audit.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 4c3fd24..683b249 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -2259,31 +2259,19 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 void audit_log_link_denied(const char *operation, const struct path *link)
 {
 	struct audit_buffer *ab;
-	struct audit_names *name;
 
 	if (!audit_enabled || audit_dummy_context())
 		return;
 
-	name = kzalloc(sizeof(*name), GFP_NOFS);
-	if (!name)
-		return;
-
 	/* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
 	ab = audit_log_start(current->audit_context, GFP_KERNEL,
 			     AUDIT_ANOM_LINK);
 	if (!ab)
-		goto out;
+		return;
 	audit_log_format(ab, "op=%s", operation);
 	audit_log_task_info(ab, current);
 	audit_log_format(ab, " res=0");
 	audit_log_end(ab);
-
-	/* Generate AUDIT_PATH record with object. */
-	name->type = AUDIT_TYPE_NORMAL;
-	audit_copy_inode(name, link->dentry, d_backing_inode(link->dentry));
-	audit_log_name(current->audit_context, name, link, 0, NULL);
-out:
-	kfree(name);
 }
 
 /**
-- 
1.8.3.1