linux-kernel - [PATCH 4/4] kcsan, debugfs: avoid updating white/blacklist with the same value

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240925143154.2322926-5-ranxiaokai627@163.com>
Date: Wed, 25 Sep 2024 14:31:54 +0000
From: ran xiaokai <ranxiaokai627@....com>
To: elver@...gle.com,
	tglx@...utronix.de,
	dvyukov@...gle.com
Cc: kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	Ran Xiaokai <ran.xiaokai@....com.cn>
Subject: [PATCH 4/4] kcsan, debugfs: avoid updating white/blacklist with the same value

From: Ran Xiaokai <ran.xiaokai@....com.cn>

When userspace passes a same white/blacklist value as it for now,
the update is actually not necessary.

Signed-off-by: Ran Xiaokai <ran.xiaokai@....com.cn>
---
 kernel/kcsan/debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kcsan/debugfs.c b/kernel/kcsan/debugfs.c
index d5e624c37125..6b05115d5b73 100644
--- a/kernel/kcsan/debugfs.c
+++ b/kernel/kcsan/debugfs.c
@@ -142,6 +142,9 @@ static ssize_t set_report_filterlist_whitelist(bool whitelist)
 	old_list = rcu_dereference_protected(rp_flist,
 					   lockdep_is_held(&rp_flist_mutex));
 
+	if (old_list->whitelist == whitelist)
+		goto out;
+
 	new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
 	if (!new_list) {
 		ret = -ENOMEM;
-- 
2.15.2