[PATCH] mmap PROT_NONE fix for NX patch

[PATCH] mmap PROT_NONE fix for NX patch

This works around the current PROT_NONE problem from elf binaries that
do not have the PT_GNU_STACK so that the do not have execute permission.

The problem was that setting "def_flags" to include the VM_EXEC bit for
compatibility reasons would also make PROT_NONE pages executable, which
is obviously not correct.

Signed-off-by: Daniel McNeil <daniel@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>