[for-linus][PATCH 4/5] kretprobe: Avoid re-registration of the same kretprobe earlier

[Steven Rostedt]

From: Wang ShaoBo <bobo.shaobowang@xxxxxxxxxx>

Our system encountered a re-init error when re-registering same kretprobe,
where the kretprobe_instance in rp->free_instances is illegally accessed
after re-init.

Implementation to avoid re-registration has been introduced for kprobe
before, but lags for register_kretprobe(). We must check if kprobe has
been re-registered before re-initializing kretprobe, otherwise it will
destroy the data struct of kretprobe registered, which can lead to memory
leak, system crash, also some unexpected behaviors.

We use check_kprobe_rereg() to check if kprobe has been re-registered
before running register_kretprobe()'s body, for giving a warning message
and terminate registration process.

Link: https://lkml.kernel.org/r/20210128124427.2031088-1-bobo.shaobowang@xxxxxxxxxx

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 1f0ab40976460 ("kprobes: Prevent re-registration of the same kprobe")
[ The above commit should have been done for kretprobes too ]
Acked-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Acked-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxxxxx>
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@xxxxxxxxxx>
Signed-off-by: Cheng Jian <cj.chengjian@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
 kernel/kprobes.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1a5bc321e0a5..d5a3eb74a657 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1994,6 +1994,10 @@ int register_kretprobe(struct kretprobe *rp)
 	if (ret)
 		return ret;
 
+	/* If only rp->kp.addr is specified, check reregistering kprobes */
+	if (rp->kp.addr && check_kprobe_rereg(&rp->kp))
+		return -EINVAL;
+
 	if (kretprobe_blacklist_size) {
 		addr = kprobe_addr(&rp->kp);
 		if (IS_ERR(addr))
-- 
2.29.2