[PATCH 2.6.10-rc3-mm1] m32r: Fix not to execute noexec pages (0/3)

[Hirokazu Takata]

Hello,

Here is a patchset to fix a bug of m32r kernel 2.6.9 that a code on
a noexec page can be executed incorrectly.

For good security, stack region should be non-executable. 
This fix is also needed to achieve non-executable stack.

Please apply this to 2.6.10 kernel if possible.

Thank you.

Signed-off-by: Hirokazu Takata <takata@xxxxxxxxxxxxxx>
---

[PATCH 2.6.10-rc3-mm1] m32r: Cause SIGSEGV for nonexec page execution (1/3)
- Cause a segmentation fault for an illegal execution of a code on
  non-executable memory page.

[PATCH 2.6.10-rc3-mm1] m32r: Don't encode ACE_INSTRUCTION in address (2/3)
- To be more comprehensive, keep ACE_INSTRUCTION (access exception 
  on instruction execution) information in thread_info->flags,
  instead of encoding it into address parameter.

[PATCH 2.6.10-rc3-mm1] m32r: Clean up arch/m32r/mm/fault.c (3/3)
- Fix a typo: ACE_USEMODE --> ACE_USERMODE.
- Update copyright statement, and so on.

--
Hirokazu Takata <takata@xxxxxxxxxxxxxx>
Linux/M32R Project:  http://www.linux-m32r.org/
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