linux-kernel - Re: [PATCH] x86/kprobes: Fix to update kcb status flag after singlestepping

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Message-ID: <20220802105230.43bb6079@gandalf.local.home>
Date:   Tue, 2 Aug 2022 10:52:30 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        Daniel Müller <deso@...teo.net>
Subject: Re: [PATCH] x86/kprobes: Fix to update kcb status flag after
 singlestepping

On Tue,  2 Aug 2022 15:04:16 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Fix kprobes to update kcb (kprobes control block) status flag to
> KPROBE_HIT_SSDONE even if the kp->post_handler is not set.
> This may cause a kernel panic if another int3 user runs right
> after kprobes because kprobe_int3_handler() misunderstands the
> int3 is kprobe's single stepping int3.
> 
> Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
> Reported-by: Daniel Müller <deso@...teo.net>
> Tested-by: Daniel Müller <deso@...teo.net>
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> Cc: stable@...r.kernel.org
> Link: https://lore.kernel.org/all/20220727210136.jjgc3lpqeq42yr3m@muellerd-fedora-PC2BDTX9
> ---

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

I guess this will go through the tip tree?

-- Steve