4.14-stable review patch. If anyone has any objections, please let me know.
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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... 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)