netdev - Re: [RFC PATCH 1/3] x86/kprobes: Support nested kprobes

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Date:   Fri, 8 May 2020 00:45:56 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Eelco Chaudron <echaudro@...hat.com>,
        Yonghong Song <yhs@...com>, bpf <bpf@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andriin@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Wang Nan <wangnan0@...wei.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 1/3] x86/kprobes: Support nested kprobes

On Thu,  7 May 2020 18:59:55 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Make kprobes to accept 1-level nesting instead of
> diff --git a/arch/x86/kernel/kprobes/ftrace.c b/arch/x86/kernel/kprobes/ftrace.c
> index 681a4b36e9bb..b695c2e118f8 100644
> --- a/arch/x86/kernel/kprobes/ftrace.c
> +++ b/arch/x86/kernel/kprobes/ftrace.c
> @@ -25,13 +25,15 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
>  		return;
>  
>  	kcb = get_kprobe_ctlblk();
> -	if (kprobe_running()) {
> +	if (!kprobe_can_nest()) {

Oops, something wrong. this kprobe_can_nest() requires kcb for
the parameter. I'll fix this.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>