linux-kernel - [PATCH v2] kretprobe: check re-registration of the same kretprobe earlier

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Date:   Mon, 9 Mar 2020 21:39:13 +0800
From:   Cheng Jian <cj.chengjian@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <cj.chengjian@...wei.com>, <huawei.libin@...wei.com>,
        <xiexiuqi@...wei.com>, <bobo.shaobowang@...wei.com>,
        <naveen.n.rao@...ux.ibm.com>, <anil.s.keshavamurthy@...el.com>,
        <davem@...emloft.net>, <mhiramat@...nel.org>
Subject: [PATCH v2] kretprobe: check re-registration of the same kretprobe earlier

Our system encountered a use-after-free when re-register the same
kretprobe, it access the kretprobe_instance in rp->free_instances
which has been released already.

Prevent re-registration has been implemented for kprobe before, but
it's too late for kretprobe. We must check the re-registration before
re-initializing the kretprobe, otherwise it will destroy the data and
struct of the kretprobe registered, it can lead to use-after-free,
memory leak, system crash, and even other unexpected behaviors.

Use check_kprobe_rereg() to check re-registration, also give a warning
message.

Signed-off-by: Cheng Jian <cj.chengjian@...wei.com>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 kernel/kprobes.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 2625c24..9cb2a0d 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1946,6 +1946,14 @@ int register_kretprobe(struct kretprobe *rp)
 		}
 	}

+	/*
+	 * Return error if it's being re-registered,
+	 * also give a warning message to the developer.
+	 */
+	ret = check_kprobe_rereg(&rp->kp);
+	if (WARN_ON(ret))
+		return ret;
+
 	rp->kp.pre_handler = pre_handler_kretprobe;
 	rp->kp.post_handler = NULL;
 	rp->kp.fault_handler = NULL;
-- 
2.7.4