linux-kernel - Re: [uaccess] 780464aed0: WARNING:at_arch/x86/include/asm/uaccess.h:#strnlen

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Message-ID: <CAHk-=wij8VLupHh1U-fFhFBjin9Fch3mG2_2=aL9h1L+WBvm2g@mail.gmail.com>
Date:   Sun, 3 Mar 2019 11:53:58 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Changbin Du <changbin.du@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Nadav Amit <namit@...are.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Joel Fernandes <joel@...lfernandes.org>, yhs@...com, lkp@...org
Subject: Re: [uaccess] 780464aed0: WARNING:at_arch/x86/include/asm/uaccess.h:#strnlen_user/0x

On Sun, Mar 3, 2019 at 9:40 AM kernel test robot <lkp@...el.com> wrote:
>
> commit: 780464aed08ad00aa6d5f81ac8bef2e714dc8b06 ("[PATCH v5 2/6] uaccess: Use user_access_ok() in user_access_begin()")

Hmm. Not an upstream commit ID, so this is presumably a backport.

Ok, let's see what it is using the web link:

> url: https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/tracing-probes-uaccess-Add-support-user-space-access/20190303-203749

Yeah, that just gives a github 404 error.

I'm _assuming_ it's the WARN_ON_IN_IRQ() in the access_ok().

Which doesn't much make sense either (why wouldn't it happen in
mainline)? But without a useful web link to see what is actually being
tested, I guess it's not something I can even look at...

                      Linus