STABLE14-give-s390x-syscall-table-the-big-hammer-20061201

STABLE14-give-s390x-syscall-table-the-big-hammer-20061201

Neale Ferguson contributed the assembler.

The false illusion of security some people want to play under is usually good for wasting a few hours; it was here. making the sys_call_table read nly for real of course fixes it, let's just hope keyrings come along before then on such platforms.

(cherry picked from commit b81763506fdf29f3df66d811e2d299cc4c9acec0)