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    SubjectRe: [RFC] selftests/x86: Add test_vsyscall
    On Thu, Jan 04, 2018 at 09:38:37PM -0800, Andy Lutomirski wrote:
    > It's RFC because I want to re-read it myself first. It's also missing
    > a test that will reliably make sure that vsyscall=none prevents use of
    > vsyscalls.

    With my patch ontop of 4.4 from yesterday:

    # ./test_vsyscall_32
    Warning: failed to find getcpu in vDSO
    [RUN] test gettimeofday()
    vDSO time offsets: 0.000001 0.000001
    [OK] vDSO gettimeofday()'s timeval was okay
    [RUN] test time()
    [OK] vDSO time() is okay
    [RUN] getcpu() on CPU 0
    [RUN] getcpu() on CPU 1
    # ./test_vsyscall_64
    vsyscall map: ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
    vsyscall permissions are r-x
    [RUN] test gettimeofday()
    vDSO time offsets: 0.000000 0.000005
    [OK] vDSO gettimeofday()'s timeval was okay
    vsyscall time offsets: 0.000004 0.000001
    [OK] vsyscall gettimeofday()'s timeval was okay
    [RUN] test time()
    [OK] vDSO time() is okay
    [OK] vsyscall time() is okay
    [RUN] getcpu() on CPU 0
    [OK] vDSO reported correct CPU
    [OK] vDSO reported correct node
    [OK] vsyscall reported correct CPU
    [OK] vsyscall reported correct node
    [RUN] getcpu() on CPU 1
    [OK] vDSO reported correct CPU
    [OK] vDSO reported correct node
    [OK] vsyscall reported correct CPU
    [OK] vsyscall reported correct node
    [RUN] Checking read access to the vsyscall page
    [FAIL] We don't have read access, but we should

    Do I really need the read access? :-)

    I have CONFIG_LEGACY_VSYSCALL_EMULATE=y

    Thx.

    --
    Regards/Gruss,
    Boris.

    Good mailing practices for 400: avoid top-posting and trim the reply.

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