linux-kernel - Re: [PATCH] selftests: seccomp: fix compile error seccomp

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Message-ID: <CAGXu5jJheScDxeB8XV+7hddhN4S4BRuMdRQwcHOuJ7WrGKJVYg@mail.gmail.com>
Date:   Tue, 9 Jan 2018 15:46:08 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Will Drewry <wad@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH] selftests: seccomp: fix compile error seccomp_bpf

On Tue, Jan 9, 2018 at 3:37 PM, Shuah Khan <shuah@...nel.org> wrote:
> On 01/09/2018 04:25 PM, Kees Cook wrote:
>> On Tue, Jan 9, 2018 at 3:24 PM, Kees Cook <keescook@...omium.org> wrote:
>>> On Tue, Jan 9, 2018 at 3:07 PM, Kees Cook <keescook@...omium.org> wrote:
>>>> On Fri, Jan 5, 2018 at 6:29 PM, Naresh Kamboju
>>>> <naresh.kamboju@...aro.org> wrote:
>>>>> On 5 January 2018 at 22:01, Anders Roxell <anders.roxell@...aro.org> wrote:
>>>>>> aarch64-linux-gnu-gcc -Wl,-no-as-needed -Wall
>>>>>>     -lpthread seccomp_bpf.c -o seccomp_bpf
>>>>>> seccomp_bpf.c: In function 'tracer_ptrace':
>>>>>> seccomp_bpf.c:1720:12: error: '__NR_open' undeclared
>>>>>>     (first use in this function)
>>>>>>   if (nr == __NR_open)
>>>>>>             ^~~~~~~~~
>>>>>> seccomp_bpf.c:1720:12: note: each undeclared identifier is reported
>>>>>>     only once for each function it appears in
>>>>>> In file included from seccomp_bpf.c:48:0:
>>>>>> seccomp_bpf.c: In function 'TRACE_syscall_ptrace_syscall_dropped':
>>>>>> seccomp_bpf.c:1795:39: error: '__NR_open' undeclared
>>>>>>     (first use in this function)
>>>>>>   EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
>>>>>>                                        ^
>>>>>> open(2) is a legacy syscall, replaced with openat(2) since 2.6.16.
>>>>>> Thus new architectures in the kernel, such as arm64, don't implement
>>>>>> these legacy syscalls.
>>>>>>
>>>>>> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
>>>>>
>>>>> Thanks for the patch Anders.
>>>>> Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>>>>
>>>> Did something change recently? This has built fine on arm64 for a
>>>> while -- at least since commit 256d0afb11d6 ("selftests/seccomp: build
>>>> and pass on arm64").
>>>
>>> Ah, found it. I broke it in a33b2d0359a0! :) Shuah, can you take this
>>> please, with this tag added:
>>>
>>> Fixes: a33b2d0359a0 ("selftests/seccomp: Add tests for basic ptrace actions")
>>
>> And Cc to stable, as this was broken in 4.14...
>>
>> Cc: stable@...r.kernel.org
>>
>> -Kees
>>
>
> Thanks Kees. Yes I will get this into 4.16-rc1. Okay to add your
> Acked-by I assume.

Yes, thanks! Here it is all together:

Fixes: a33b2d0359a0 ("selftests/seccomp: Add tests for basic ptrace actions")
Cc: stable@...r.kernel.org
Acked-by: Kees Cook <keescook@...omium.org>


-Kees

-- 
Kees Cook
Pixel Security