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

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Message-ID: <20220308200052.rpr4vkxppnxguirg@ast-mbp.dhcp.thefacebook.com>
Date:   Tue, 8 Mar 2022 12:00:52 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        jpoimboe@...hat.com, andrew.cooper3@...rix.com,
        linux-kernel@...r.kernel.org, ndesaulniers@...gle.com,
        keescook@...omium.org, samitolvanen@...gle.com,
        mark.rutland@....com, alyssa.milburn@...el.com, mbenes@...e.cz,
        rostedt@...dmis.org, mhiramat@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v4 00/45] x86: Kernel IBT

On Tue, Mar 08, 2022 at 04:30:11PM +0100, Peter Zijlstra wrote:
> Hopefully last posting...
> 
> Since last time:
> 
>  - updated the ftrace_location() patch (naveen, rostedt)
>  - added a few comments and clarifications (bpetkov)
>  - disable jump-tables (joao)
>  - verified clang-14-rc2 works
>  - fixed a whole bunch of objtool unreachable insn issue
>  - picked up a few more tags
> 
> Patches go on top of tip/master + arm64/for-next/linkage. Also available here:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/wip.ibt

I've tried to test it.
Applied the first 23 patches, since patch 24 failed to apply to bpf and bpf-next trees.
selftest/bpf/test_progs
shows that all bpf trampoline tests are failing and
eventually the kernel is crashing:
[   53.040582] RIP: 0010:do_init_module+0x9/0x6f0
[   53.052044] Call Trace:
[   53.052319]  <TASK>
[   53.052559]  bpf_trampoline_6442471381_0+0x32/0x1000
[   53.053117]  do_init_module+0x5/0x6f0
[   53.053550]  load_module+0x77c0/0x9c00

I havne't had time to debug what's going on.