linux-kernel - Re: [PATCH v4 00/45] x86: Kernel IBT

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Date:   Tue, 15 Mar 2022 11:39:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        X86 ML <x86@...nel.org>, joao@...rdrivepizza.com,
        hjl.tools@...il.com, Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Mark Rutland <mark.rutland@....com>, alyssa.milburn@...el.com,
        Miroslav Benes <mbenes@...e.cz>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v4 00/45] x86: Kernel IBT

On Tue, Mar 15, 2022 at 11:07:06AM +0100, Peter Zijlstra wrote:
> On Tue, Mar 15, 2022 at 10:00:43AM +0100, Peter Zijlstra wrote:
> > I don't seem able to run this mod_race test, it keeps saying:
> > 
> >   tgl-build# ./test_progs -v -t mod_race
> >   bpf_testmod.ko is already unloaded.
> >   Loading bpf_testmod.ko...
> >   Successfully loaded bpf_testmod.ko.
> >   Summary: 0/0 PASSED, 0 SKIPPED, 0 FAILED
> >   Successfully unloaded bpf_testmod.ko.
> > 
> > Which I'm taking to mean I'm doing it wrong... 
> 
> That.. I was building the wrong tree, mod_race comes from bpf-next and I
> was building a tree without that merged in... let me to see what it does
> now.

I can confirm, crashes without, fixed with. Thanks!

I've forced pushed a cleaned up tip/x86/core. Also:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/ibt.bpf

is a merge of that and bpf-next