linux-hardening - Re: [CRASH][BISECTED] 6.4.1 crash in boot

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Date:   Thu, 6 Jul 2023 07:02:11 +0200
From:   Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
To:     Kees Cook <kees@...nel.org>, Kees Cook <keescook@...omium.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux LLVM <llvm@...ts.linux.dev>,
        linux-kbuild@...r.kernel.org,
        Linux Regressions <regressions@...ts.linux.dev>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-hardening@...r.kernel.org
Subject: Re: [CRASH][BISECTED] 6.4.1 crash in boot

On 7/5/23 04:09, Kees Cook wrote:
>>>
>>> Hmm, is CONFIG_UBSAN_TRAP set?
>>
>> marvin@...iant:~/linux/kernel/linux_torvalds$ grep CONFIG_UBSAN_TRAP .config
>> CONFIG_UBSAN_TRAP=y
> 
> Ah-ha! Turn that off please. With it off you will get much more useful reports from USBAN.

Done that. And it appears to work.

Great job.

There should be a way to store the earliest kernel messages while in the initrd phase, but
I can't think of any either ...

Have a nice day!

Best regards,
Mirsad Todorovac