linux-kernel - Re: [PATCH v3 0/2] x86/kprobes: Fixes for CONFIG

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Message-ID: <20220908193147.mtfwh33q2cfbw52b@treble>
Date:   Thu, 8 Sep 2022 12:31:47 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Suleiman Souhlal <suleiman@...gle.com>,
        bpf <bpf@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...e.de>, x86@...nel.org
Subject: Re: [PATCH v3 0/2] x86/kprobes: Fixes for CONFIG_RETHUNK

On Fri, Sep 09, 2022 at 12:01:11AM +0900, Masami Hiramatsu (Google) wrote:
> Hi Peter and Josh,
> 
> So here is 3rd version of the patches to fix kprobes and optprobe with
> CONFIG_RETHUNK and CONFIG_SLS.
> Previous version is here;
> 
> https://lore.kernel.org/all/166260087224.759381.4170102827490658262.stgit@devnote2/
> 
> In this version, I simplified all code and just checks the INT3 comes
> from kgdb or not. Other INT3 are treated as one-byte instruction.

Looks good to me.

I was confused by the naming of kgdb_has_hit_break(), because in this
case, with the function being called from outside the stopped kgdb
context, the breakpoint hasn't actually been hit.  But it still seems to
do the right thing: it checks for BP_ACTIVE which means the breakpoint
has been written.

Reviewed-by: Josh Poimboeuf <jpoimboe@...nel.org>

-- 
Josh