x86/entry, selftests/x86: Add a test for 32-bit fast syscall arg faults

This test passes on 4.0 and fails on some newer kernels.
Fortunately, the failure is likely not a big deal.

This test will make sure that we don't break it further (e.g. OOPSing)
as we clean up the entry code and that we eventually fix the
regression.

There's arguably no need to preserve the old ABI here --
anything that makes it into a fast (vDSO) syscall with a bad
stack is about to crash no matter what we do.

Signed-off-by: Andy Lutomirski <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/9cfcc51005168cb1b06b31991931214d770fc59a.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions