selftests/x86/ldt_gdt: Run most existing LDT test cases against the GDT as well

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>

diff --git a/tools/testing/selftests/x86/ldt_gdt.c b/tools/testing/selftests/x86/ldt_gdt.c
index 4e9add7bf8a93a0f8f0260213f99819a679ff4cf..66e5ce5b91f008d5dffc7848d0e99d730ad589b5 100644 (file)
--- 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 struct user_desc *d, uint32_t ar,
 
 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)