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

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>

diff --git a/tools/testing/selftests/x86/ldt_gdt.c b/tools/testing/selftests/x86/ldt_gdt.c
index 45f30249133f2da54caa078f65e80ef4fab71c5b..3bb42fff5d663bc3d8283c625c15eaeb79871d94 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)