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

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Date:   Sat, 6 Jan 2018 07:59:34 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>, wad@...omium.org,
        Andy Lutomirski <luto@...capital.net>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] selftests: seccomp: fix compile error seccomp_bpf

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>

> ---
>  tools/testing/selftests/seccomp/seccomp_bpf.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
> index 24dbf634e2dd..0b457e8e0f0c 100644
> --- a/tools/testing/selftests/seccomp/seccomp_bpf.c
> +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
> @@ -1717,7 +1717,7 @@ void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
>
>         if (nr == __NR_getpid)
>                 change_syscall(_metadata, tracee, __NR_getppid);
> -       if (nr == __NR_open)
> +       if (nr == __NR_openat)
>                 change_syscall(_metadata, tracee, -1);
>  }
>
> @@ -1792,7 +1792,7 @@ TEST_F(TRACE_syscall, ptrace_syscall_dropped)
>                                            true);
>
>         /* Tracer should skip the open syscall, resulting in EPERM. */
> -       EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
> +       EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_openat));
>  }
>
>  TEST_F(TRACE_syscall, syscall_allowed)
> --
> 2.11.0
>