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

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Message-ID: <CAGXu5jJf1fm0X8EUE-XQCbEgWmoikt5k09YuPvKSZZ2Q=vtsJw@mail.gmail.com>
Date:   Tue, 9 Jan 2018 15:25:35 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Shuah Khan <shuah@...nel.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>
Subject: Re: [PATCH] selftests: seccomp: fix compile error seccomp_bpf

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

-- 
Kees Cook
Pixel Security