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Date: Fri, 12 Jan 2018 13:57:39 +0100
From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
        Borislav Petkov <bp@alien8.de>,
        Kees Cook <keescook@chromium.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hugh Dickins <hughd@google.com>, stable@vger.kernel.org
Subject: Re: [PATCH] selftests/x86: Add test_vsyscall
Message-ID: <20180112125739.cl6jlm5cjvvg2i6f@gmail.com>
References: <2b9c5a174c1d60fd7774461d518aa75598b1d8fd.1515719552.git.luto@kernel.org>
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* Andy Lutomirski <luto@kernel.org> wrote:

> tools/testing/selftests/x86/Makefile        |   2 +-
>  tools/testing/selftests/x86/test_vsyscall.c | 500 ++++++++++++++++++++++++++++
>  2 files changed, 501 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/x86/test_vsyscall.c

Hm, it doesn't even build here, on Ubuntu latest (Artful):

triton:~/tip/tools/testing/selftests/x86> make test_vsyscall
gcc -O2 -g -std=gnu99 -pthread -Wall -no-pie    test_vsyscall.c   -o test_vsyscall
/tmp/ccKyelfb.o: In function `init_vdso':
/home/mingo/tip/tools/testing/selftests/x86/test_vsyscall.c:68: undefined reference to `dlopen'
/home/mingo/tip/tools/testing/selftests/x86/test_vsyscall.c:76: undefined reference to `dlsym'
/home/mingo/tip/tools/testing/selftests/x86/test_vsyscall.c:80: undefined reference to `dlsym'
/home/mingo/tip/tools/testing/selftests/x86/test_vsyscall.c:84: undefined reference to `dlsym'
/home/mingo/tip/tools/testing/selftests/x86/test_vsyscall.c:88: undefined reference to `dlsym'
/home/mingo/tip/tools/testing/selftests/x86/test_vsyscall.c:70: undefined reference to `dlopen'
collect2: error: ld returned 1 exit status
<builtin>: recipe for target 'test_vsyscall' failed
make: *** [test_vsyscall] Error 1

Thanks,

	Ingo