From: Gaosheng Cui <cuigaosheng1@huawei.com>
To: <paul@paul-moore.com>, <eparis@redhat.com>
Cc: <linux-audit@redhat.com>, <linux-kernel@vger.kernel.org>,
<xiujianfeng@huawei.com>, <wangweiyang2@huawei.com>
Subject: [PATCH -next] audit: return early if the rule has a lower priority
Date: Tue, 12 Oct 2021 09:32:40 +0800 [thread overview]
Message-ID: <20211012013240.63072-1-cuigaosheng1@huawei.com> (raw)
It is not necessary for audit_filter_rules() functions to check
audit fileds of the rule with a lower priority, and if we did,
there might be some unintended effects, such as the ctx->ppid
may be changed unexpectedly, so return early if the rule has
a lower priority.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
---
kernel/auditsc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 4ba3b8573ff4..eee14dfad0fa 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -470,6 +470,9 @@ static int audit_filter_rules(struct task_struct *tsk,
u32 sid;
unsigned int sessionid;
+ if (ctx && rule->prio <= ctx->prio)
+ return 0;
+
cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
for (i = 0; i < rule->field_count; i++) {
@@ -737,8 +740,6 @@ static int audit_filter_rules(struct task_struct *tsk,
}
if (ctx) {
- if (rule->prio <= ctx->prio)
- return 0;
if (rule->filterkey) {
kfree(ctx->filterkey);
ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
--
2.30.0
next reply other threads:[~2021-10-12 1:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-12 1:32 Gaosheng Cui [this message]
2021-10-13 7:16 ` [PATCH -next] audit: return early if the rule has a lower priority Dan Carpenter
2021-10-13 9:44 ` cuigaosheng
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