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

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Date:   Wed, 26 Feb 2020 10:49:28 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        "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 11:53:37AM +0000, Cristian Marussi wrote:
> Sorry I lost track of this thread....tested now on v5.6rc3 on arm64 on a local
> setup (not proper CI) with CONFIG_LKDTM=y and solves the above issue. (missing CONFIG_LKDTM?)

Great!

> Looking at the general run though I have anyway a bunch of SKIP similar to Naresh
> 
> ./run_kselftest.sh 2>/dev/null | grep "SKIP"
> not ok 1 selftests: lkdtm: PANIC.sh # SKIP
> not ok 6 selftests: lkdtm: LOOP.sh # SKIP
> not ok 7 selftests: lkdtm: EXHAUST_STACK.sh # SKIP
> not ok 8 selftests: lkdtm: CORRUPT_STACK.sh # SKIP
> not ok 9 selftests: lkdtm: CORRUPT_STACK_STRONG.sh # SKIP
> not ok 15 selftests: lkdtm: UNSET_SMEP.sh # SKIP
> not ok 16 selftests: lkdtm: DOUBLE_FAULT.sh # SKIP
> not ok 18 selftests: lkdtm: OVERWRITE_ALLOCATION.sh # SKIP
> not ok 19 selftests: lkdtm: WRITE_AFTER_FREE.sh # SKIP
> not ok 21 selftests: lkdtm: WRITE_BUDDY_AFTER_FREE.sh # SKIP
> not ok 26 selftests: lkdtm: SOFTLOCKUP.sh # SKIP
> not ok 27 selftests: lkdtm: HARDLOCKUP.sh # SKIP
> not ok 28 selftests: lkdtm: SPINLOCKUP.sh # SKIP
> not ok 29 selftests: lkdtm: HUNG_TASK.sh # SKIP
> not ok 59 selftests: lkdtm: REFCOUNT_TIMING.sh # SKIP
> not ok 60 selftests: lkdtm: ATOMIC_TIMING.sh # SKIP
> 
> BUT, if I look at one LKDTM test script
> (lkdtm/USERCOPY_STACK_FRAME_TO.sh):
> 
> ...
> # If the test is commented out, report a skip
> if echo "$test" | grep -q '^#' ; then
> ...
> 
> and in fact:
> 
> root@...t-ubuntu:/opt/ksft# cat lkdtm/tests.txt | grep ^#
> #PANIC
> #LOOP Hangs the system
> #EXHAUST_STACK Corrupts memory on failure
> #CORRUPT_STACK Crashes entire system on success
> #CORRUPT_STACK_STRONG Crashes entire system on success
> #OVERWRITE_ALLOCATION Corrupts memory on failure
> #WRITE_AFTER_FREE Corrupts memory on failure
> #WRITE_BUDDY_AFTER_FREE Corrupts memory on failure
> #SOFTLOCKUP Hangs the system
> #HARDLOCKUP Hangs the system
> #SPINLOCKUP Hangs the system
> #HUNG_TASK Hangs the system
> #REFCOUNT_TIMING timing only
> #ATOMIC_TIMING timing only
> 
> so only two of the above tests are in fact unexpectedly skipped.

Yup, that is operating as expected. :)

> not ok 15 selftests: lkdtm: UNSET_SMEP.sh # SKIP
> not ok 16 selftests: lkdtm: DOUBLE_FAULT.sh # SKIP

These are x86-specific, so that is correct as well.

Thanks for following up!

-- 
Kees Cook