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    Subject[PATCH 4.14 062/159] selftests/x86/ldt_gdt: Run most existing LDT test cases against the GDT as well
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Andy Lutomirski <luto@kernel.org>

    commit adedf2893c192dd09b1cc2f2dcfdd7cad99ec49d upstream.

    Now that the main test infrastructure supports the GDT, run tests
    that will pass the kernel's GDT permission tests against the GDT.

    Signed-off-by: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bpetkov@suse.de>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/686a1eda63414da38fcecc2412db8dba1ae40581.1509794321.git.luto@kernel.org
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    tools/testing/selftests/x86/ldt_gdt.c | 10 +++++++++-
    1 file changed, 9 insertions(+), 1 deletion(-)

    --- a/tools/testing/selftests/x86/ldt_gdt.c
    +++ b/tools/testing/selftests/x86/ldt_gdt.c
    @@ -189,7 +189,15 @@ static bool install_valid_mode(const str

    static bool install_valid(const struct user_desc *desc, uint32_t ar)
    {
    - return install_valid_mode(desc, ar, false, true);
    + bool ret = install_valid_mode(desc, ar, false, true);
    +
    + if (desc->contents <= 1 && desc->seg_32bit &&
    + !desc->seg_not_present) {
    + /* Should work in the GDT, too. */
    + install_valid_mode(desc, ar, false, false);
    + }
    +
    + return ret;
    }

    static void install_invalid(const struct user_desc *desc, bool oldmode)

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