linux-kernel - Re: [PATCH 1/5] test_kmod: make selftest executable

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Message-ID: <6d98d850-4a6a-195e-ecd7-794678f94b31@kernel.org>
Date:   Wed, 2 Aug 2017 17:57:52 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Jessica Yu <jeyu@...hat.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Michal Marek <mmarek@...e.com>, Petr Mladek <pmladek@...e.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        dcb314@...mail.com, linux-kselftest@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 1/5] test_kmod: make selftest executable

Hi Luis,

On 08/02/2017 04:55 PM, Luis R. Rodriguez wrote:
> On Wed, Aug 2, 2017 at 3:43 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> On Wed,  2 Aug 2017 14:14:46 -0700 "Luis R. Rodriguez" <mcgrof@...nel.org> wrote:
>>
>>> We had just forgotten to do this.

Could you please include the real reason you need this change.
My guess is, you are seeing this failure.

make -C kmod/ run_tests 
make: Entering directory '/lkml/linux_4.13/tools/testing/selftests/kmod'
/bin/sh: 1: ./kmod.sh: Permission denied
selftests:  kmod.sh [FAIL]


>>>
>>> Fixes: 39258f448d71 ("kmod: add test driver to stress test the module loader")
>>> Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
>>> ---
>>>  tools/testing/selftests/kmod/kmod.sh | 0
>>>  1 file changed, 0 insertions(+), 0 deletions(-)
>>>  mode change 100644 => 100755 tools/testing/selftests/kmod/kmod.sh
>>>
>>> diff --git a/tools/testing/selftests/kmod/kmod.sh b/tools/testing/selftests/kmod/kmod.sh
>>> old mode 100644
>>> new mode 100755
>>
>> This is pretty fragile - I'm not sure that patch/diff are capable of
>> communicating a bare chmod.  If someone does a "patch -p1 < patch-4.14"
>> or whatever, this change is likely to get lost.
> 
> True if using regular diff, if using git, it will catch it though.
> 
>> It's more robust to not care about the x bit at all.  Something like
>> this?
>>
>> --- a/tools/testing/selftests/lib.mk~a
>> +++ a/tools/testing/selftests/lib.mk
>> @@ -14,7 +14,7 @@ all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_
>>  define RUN_TESTS
>>         @for TEST in $(TEST_GEN_PROGS) $(TEST_PROGS); do \
>>                 BASENAME_TEST=`basename $$TEST`;        \
>> -               cd `dirname $$TEST`; (./$$BASENAME_TEST && echo "selftests: $$BASENAME_TEST [PASS]") || echo "selftests:  $$BASENAME_TEST [FAIL]"; cd -;\
>> +               cd `dirname $$TEST`; (/bin/sh ./$$BASENAME_TEST && echo "selftests: $$BASENAME_TEST [PASS]") || echo "selftests:  $$BASENAME_TEST [FAIL]"; cd -;\
>>         done;
>>  endef
>>
>>
>> (probably incomplete, should presumably use $SHELL or something)
> 
> Probably a good idea indeed, Shuah ?

I think this is a good idea. At the moment any script without +x fails.
It would be good change to make in the generic layer.

> 
> Although I'll note I also do like to run selftest scripts on my own
> too, so the chmod is still desirable.

You will have to run it under bash kmod/kmod.sh - It can be painful.

This is one of the reasons a lot of the scripts are executable.
I am curious how you didn't catch this before.

I can take this one. Please fix the change log though. That will
explain why this change is made.

thanks,
-- Shuah