[PATCH 0/2] Fix compatible mmap() return pointer over 4Gb

[Dmitry Safonov <dsafonov@virtuozzo.com>]

A fix for bug in mmap() that I referenced in [1].
Also selftest for it.

I would like to mark the fix as for stable v4.9 kernel if it'll
be accepted, as I try to support compatible 32-bit C/R
after v4.9 and working compatible mmap() is really wanted there.

[1]: https://marc.info/?l=linux-kernel&m=148311451525315

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: x86@kernel.org

Dmitry Safonov (2):
  x86/mm: don't mmap() over 4GB with compat syscall
  selftests/x86: add test to check compat mmap() return addr

 arch/x86/kernel/sys_x86_64.c                   |  37 ++++-
 tools/testing/selftests/x86/Makefile           |   2 +-
 tools/testing/selftests/x86/test_compat_mmap.c | 200 +++++++++++++++++++++++++
 3 files changed, 230 insertions(+), 9 deletions(-)
 create mode 100644 tools/testing/selftests/x86/test_compat_mmap.c

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2.11.0