linux-kernel - Re: [PATCH 1/2] x86/kprobes: Fix kprobes instruction boudary check with CONFIG

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Message-ID: <YxhwGkmRy/kJa9fG@hirez.programming.kicks-ass.net>
Date:   Wed, 7 Sep 2022 12:19:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     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>,
        Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org
Subject: Re: [PATCH 1/2] x86/kprobes: Fix kprobes instruction boudary check
 with CONFIG_RETHUNK

On Wed, Sep 07, 2022 at 06:49:57PM +0900, Masami Hiramatsu wrote:
> Yeah, this looks good to me. What I just need is to add expanding
> queue buffer. (can we use xarray for this purpose?)

Yeah, xarray might just work.

I need to go fetch the kids from school, but if I remember I'll modify
objtool to tell us the max number required here (for any one particular
build obviously).