tree 9a353d57bbf1702d75d2854305d10e4bc9b9fc22
parent 7523e4dc5057e157212b4741abd6256e03404cf1
author Rusty Russell <rusty@rustcorp.com.au> 1448493308 +1030
committer Jiri Kosina <jkosina@suse.cz> 1449265586 +0100

module: clean up RO/NX handling.

Modules have three sections: text, rodata and writable data.  The code
handled the case where these overlapped, however they never can:
debug_align() ensures they are always page-aligned.

This is why we got away with manually traversing the pages in
set_all_modules_text_rw() without rounding.

We create three helper functions: frob_text(), frob_rodata() and
frob_writable_data().  We then call these explicitly at every point,
so it's clear what we're doing.

We also expose module_enable_ro() and module_disable_ro() for
livepatch to use.

Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>