linux-kernel - Re: selftests: Linux Kernel Dump Test Module output

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Date:   Wed, 26 Feb 2020 11:01:30 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Cristian Marussi <cristian.marussi@....com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        lkft-triage@...ts.linaro.org,
        open list <linux-kernel@...r.kernel.org>, ankita@...ibm.com,
        Will Deacon <will@...nel.org>, ardb@...nel.org,
        "Guohanjun (Hanjun Guo)" <guohanjun@...wei.com>
Subject: Re: selftests: Linux Kernel Dump Test Module output

On Wed, Feb 26, 2020 at 11:32:46PM +0530, Naresh Kamboju wrote:
> Yeah i see this case at my end also.
> 
> my two cents,
> I have two comments,
> 1) shell check

I'll fix these up; thanks for the suggestions!

> Test output with set -x for debugging shell scripts.
> [...]
> ++ dmesg -c
> +++ mktemp --tmpdir -t lkdtm-XXXXXX
> ++ LOG=/tmp/lkdtm-r5yZ7K
> ++ trap cleanup EXIT
> ++ /bin/sh -c 'cat <(echo BUG) >/sys/kernel/debug/provoke-crash/DIRECT'
> ++ true
> ++ dmesg -c
> ++ cat /tmp/lkdtm-r5yZ7K

This is the part that is failing and I don't know why.

clear the kernel event log:
	dmesg -c
trigger the kernel event:
	/bin/sh -c 'cat <(echo BUG) >/sys/kernel/debug/provoke-crash/DIRECT'
dump the newly added event logs into a file (set -x doesn't report
redirection to /tmp/lkdtm-r5yZ7K):
	dmesg -c

It seems /tmp/lkdtm-r5yZ7K is empty?

-- 
Kees Cook