linux-kernel - Re: [PATCH v2] panic: Taint kernel if fault injection has been used

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Message-ID: <2ED74AA5-B2A5-43FA-ADF9-B6752FE410C4@goodmis.org>
Date:   Wed, 07 Dec 2022 00:18:17 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:     Masami Hiramatsu <mhiramat@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        KP Singh <kpsingh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Florent Revest <revest@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Chris Mason <clm@...a.com>
Subject: Re: [PATCH v2] panic: Taint kernel if fault injection has been used



On December 6, 2022 11:45:17 PM EST, Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
>On Tue, Dec 6, 2022 at 8:39 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>> >
>> > [   49.281382] general protection fault, probably for non-canonical address 0x57e006e00000000: 0000 [#1] PREEMPT SMP KASAN
>> > [   49.282226] CPU: 6 PID: 1688 Comm: test_progs Tainted: G    B      O       6.1.0-rc7-01508-gf0c5a2d9f234 #4343
>> > [   49.283751] RIP: 0010:rethook_trampoline_handler+0xff/0x1d0
>> > [   49.289900] Call Trace:
>> > [   49.290083]  <TASK>
>> > [   49.290248]  arch_rethook_trampoline_callback+0x6c/0xa0
>> > [   49.290631]  arch_rethook_trampoline+0x2c/0x50
>> > [   49.290964]  ? lock_release+0xad/0x3f0
>> > [   49.291245]  ? bpf_prog_test_run_tracing+0x235/0x380
>> > [   49.291609]  trace_clock_x86_tsc+0x10/0x10
>> >
>> > This is just running bpf selftests in parallel mode on 16-cpu VM on bpf-next.
>> > Notice 'Tained' flags.
>> > Please take a look.
>> >
>>
>> "G - Proprietary module" - "O - out of tree module"
>>
>> Can you reproduce this without those taints?
>
>Lol. That question is exactly the reason why my Nack stands.

I only said the above *because* of your comment ;-) 

-- Steve


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