linux-kernel - Re: [PATCH] rcu/kprobes: Comment why rcu_nmi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200219174133.GK2935@paulmck-ThinkPad-P72>
Date:   Wed, 19 Feb 2020 09:41:33 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mingo@...nel.org, joel@...lfernandes.org,
        gregkh@...uxfoundation.org, gustavo@...eddedor.com,
        tglx@...utronix.de, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        luto@...nel.org, tony.luck@...el.com, frederic@...nel.org,
        dan.carpenter@...cle.com, mhiramat@...nel.org
Subject: Re: [PATCH] rcu/kprobes: Comment why rcu_nmi_enter() is marked
 NOKPROBE

On Wed, Feb 19, 2020 at 12:16:09PM -0500, Steven Rostedt wrote:
> From: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 
> It's confusing that rcu_nmi_enter() is marked NOKPROBE and
> rcu_nmi_exit() is not. One may think that the exit needs to be marked
> for the same reason the enter is, as rcu_nmi_exit() reverts the RCU
> state back to what it was before rcu_nmi_enter(). But the reason has
> nothing to do with the state of RCU.
> 
> The breakpoint handler (int3 on x86) must not have any kprobe on it
> until the kprobe handler is called. Otherwise, it can cause an infinite
> recursion and crash the machine. It just so happens that
> rcu_nmi_enter() is called by the int3 handler before the kprobe handler
> can run, and therefore needs to be marked as NOKPROBE.
> 
> Comment this to remove the confusion to why rcu_nmi_enter() is marked
> NOKPROBE but rcu_nmi_exit() is not.
> 
> Link: https://lore.kernel.org/r/20200213163800.5c51a5f1@gandalf.local.home
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Reviewed-by: Paul E. McKenney <paulmck@...nel.org>

> ---
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index 1694a6b57ad8..ada7b2b638fb 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -846,6 +846,14 @@ void rcu_nmi_enter(void)
>  {
>  	rcu_nmi_enter_common(false);
>  }
> +/*
> + * All functions called in the breakpoint trap handler (e.g. do_int3()
> + * on x86), must not allow kprobes until the kprobe breakpoint handler
> + * is called, otherwise it can cause an infinite recursion.
> + * On some archs, rcu_nmi_enter() is called in the breakpoint handler
> + * before the kprobe breakpoint handler is called, thus it must be
> + * marked as NOKPROBE.
> + */
>  NOKPROBE_SYMBOL(rcu_nmi_enter);
>  
>  /**