linux-kernel - [PATCH V5] audit: save signal match info in case entry passed in is the one deleted

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Date:	Wed,  5 Aug 2015 05:23:10 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>, sgrubb@...hat.com,
	pmoore@...hat.com, eparis@...hat.com
Subject: [PATCH V5] audit: save signal match info in case entry passed in is the one deleted

Move the access to the entry for audit_match_signal() to the beginning of the
function in case the entry found is the same one passed in.  This will enable
it to be used by audit_remove_mark_rule().

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>

Revision history:
v4 -> v5:
    Move mutex_unlock after out label.
    Move list_del group after test for signal to remove temp variable.

---
This patch was split out from the audit by executable path patch set due to the
potential to use it elsewhere.

In particular, some questions came up while assessing the potential for code
reuse:

	Why does audit_remove_parent_watches() not call audit_del_rule() for
	each entry found?
                Is audit_signals not properly decremented?
                Is audit_n_rules not properly decremented?

        Why does kill_rules() not call audit_del_rule() for each entry found?
                Is audit_signals not properly decremented?
                Is audit_n_rules not properly decremented?

 kernel/auditfilter.c |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 4cb9b44..1b110fb 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -953,7 +953,6 @@ static inline int audit_del_rule(struct audit_entry *entry)
 	mutex_lock(&audit_filter_mutex);
 	e = audit_find_rule(entry, &list);
 	if (!e) {
-		mutex_unlock(&audit_filter_mutex);
 		ret = -ENOENT;
 		goto out;
 	}
@@ -964,9 +963,8 @@ static inline int audit_del_rule(struct audit_entry *entry)
 	if (e->rule.tree)
 		audit_remove_tree_rule(&e->rule);
 
-	list_del_rcu(&e->list);
-	list_del(&e->rule.list);
-	call_rcu(&e->rcu, audit_free_rule_rcu);
+	if (e->rule.exe)
+		audit_remove_mark_rule(&e->rule);
 
 #ifdef CONFIG_AUDITSYSCALL
 	if (!dont_count)
@@ -975,9 +973,14 @@ static inline int audit_del_rule(struct audit_entry *entry)
 	if (!audit_match_signal(entry))
 		audit_signals--;
 #endif
-	mutex_unlock(&audit_filter_mutex);
+
+	list_del_rcu(&e->list);
+	list_del(&e->rule.list);
+	call_rcu(&e->rcu, audit_free_rule_rcu);
 
 out:
+	mutex_unlock(&audit_filter_mutex);
+
 	if (tree)
 		audit_put_tree(tree);	/* that's the temporary one */
 
-- 
1.7.1

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