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module: When modifying a module's text ignore modules which are going away too

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By default, during the access permission modification of a module's core
and init pages, we only ignore modules that are malformed. Albeit for a
module which is going away, it does not make sense to change its text to
RO since the module should be RW, before deallocation.

This patch makes set_all_modules_text_ro() skip modules which are going
away too.

Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Link: http://lkml.kernel.org/r/1477560966-781-1-git-send-email-atomlin@redhat.com
[jeyu@redhat.com: add comment as suggested by Steven Rostedt]
Signed-off-by: Jessica Yu <jeyu@redhat.com>
This commit is contained in:
Aaron Tomlin 2016-10-27 10:36:06 +01:00 committed by Jessica Yu
parent 885a78d4a5
commit 905dd707fc
1 changed files with 7 additions and 1 deletions
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8
kernel/module.c
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@ -1958,7 +1958,13 @@ void set_all_modules_text_ro(void)
mutex_lock(&module_mutex);
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
/*
* Ignore going modules since it's possible that ro
* protection has already been disabled, otherwise we'll
* run into protection faults at module deallocation.
*/
if (mod->state == MODULE_STATE_UNFORMED ||
mod->state == MODULE_STATE_GOING)
continue;
frob_text(&mod->core_layout, set_memory_ro);