diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2016-07-27 04:47:35 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2016-08-04 02:46:54 +0200 |
| commit | bdc9f373551dd3f1e6fae1618f2394ee9bc7db2e (patch) | |
| tree | 544ec1154b88d6e39134f4d2bf7b3110639ba8ee /kernel | |
| parent | exceptions: fork exception table content from module.h into extable.h (diff) | |
| download | linux-bdc9f373551dd3f1e6fae1618f2394ee9bc7db2e.tar.xz linux-bdc9f373551dd3f1e6fae1618f2394ee9bc7db2e.zip | |
jump_label: disable preemption around __module_text_address().
Steven reported a warning caused by not holding module_mutex or
rcu_read_lock_sched: his backtrace was corrupted but a quick audit
found this possible cause. It's wrong anyway...
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/jump_label.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 0dbea887d625..0eef93962a91 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -284,11 +284,14 @@ static int __jump_label_mod_text_reserved(void *start, void *end) { struct module *mod; + preempt_disable(); mod = __module_text_address((unsigned long)start); + WARN_ON_ONCE(__module_text_address((unsigned long)end) != mod); + preempt_enable(); + if (!mod) return 0; - WARN_ON_ONCE(__module_text_address((unsigned long)end) != mod); return __jump_label_text_reserved(mod->jump_entries, mod->jump_entries + mod->num_jump_entries, |