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| author | Aaron Tomlin <atomlin@redhat.com> | 2016-10-27 10:36:06 +0100 |
|---|---|---|
| committer | Jessica Yu <jeyu@redhat.com> | 2016-11-26 11:18:03 -0800 |
| commit | 905dd707fc856bae57de144dcf873583881f9489 (patch) | |
| tree | 44b86285a362094c40916410c761f4778f8c30e3 | |
| parent | 885a78d4a5b3ad2d7c41d1819b001d7957f442cd (diff) | |
| download | linux-stable-905dd707fc856bae57de144dcf873583881f9489.tar.gz linux-stable-905dd707fc856bae57de144dcf873583881f9489.tar.bz2 linux-stable-905dd707fc856bae57de144dcf873583881f9489.zip | |
module: When modifying a module's text ignore modules which are going away too
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>
| -rw-r--r-- | kernel/module.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c index f082832ad3ad..927a67e30855 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -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); |