diff options
| author | Wang ShaoBo <bobo.shaobowang@huawei.com> | 2021-01-28 20:44:27 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-10 09:12:09 +0100 |
| commit | e5bbb942566f2a5b7c61acbbd4f09a900b0c0f20 (patch) | |
| tree | 309fa8655ae1ca3e28967f5a5f343ebd0d8ab3d9 | |
| parent | b08e7ee5ce5c63e397410c420c3cf24f6a7bd6b9 (diff) | |
| download | linux-rt-e5bbb942566f2a5b7c61acbbd4f09a900b0c0f20.tar.gz | |
kretprobe: Avoid re-registration of the same kretprobe earlier
commit 0188b87899ffc4a1d36a0badbe77d56c92fd91dc upstream.
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@huawei.com
Cc: stable@vger.kernel.org
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@linux.vnet.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@linux.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/kprobes.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index fdf6656cce29..d752c1df8f3f 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1989,6 +1989,10 @@ int register_kretprobe(struct kretprobe *rp) if (!kprobe_on_func_entry(rp->kp.addr, rp->kp.symbol_name, rp->kp.offset)) return -EINVAL; + /* 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)) |