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

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Date:   Tue, 9 Jan 2018 16:37:55 -0700
From:   Shuah Khan <shuah@...nel.org>
To:     Kees Cook <keescook@...omium.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     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>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests: seccomp: fix compile error seccomp_bpf

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.

thanks,
-- Shuah