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authorJessica Yu <jeyu@redhat.com>2016-03-17 03:55:39 +0300
committerJiri Kosina <jkosina@suse.cz>2016-03-17 11:45:10 +0300
commit7e545d6eca20ce8ef7f66a63146cbff82b2ba760 (patch)
treef8c4366009b357842b8b17b3bfddbfc3b634ff40 /kernel/module.c
parent4c973d1620ae08f5cbe27644c5f5b974c8f594ec (diff)
downloadlinux-7e545d6eca20ce8ef7f66a63146cbff82b2ba760.tar.xz
livepatch/module: remove livepatch module notifier
Remove the livepatch module notifier in favor of directly enabling and disabling patches to modules in the module loader. Hard-coding the function calls ensures that ftrace_module_enable() is run before klp_module_coming() during module load, and that klp_module_going() is run before ftrace_release_mod() during module unload. This way, ftrace and livepatch code is run in the correct order during the module load/unload sequence without dependence on the module notifier call chain. Signed-off-by: Jessica Yu <jeyu@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 6dbfad415d51..4b65fbb10bdc 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -53,6 +53,7 @@
#include <asm/sections.h>
#include <linux/tracepoint.h>
#include <linux/ftrace.h>
+#include <linux/livepatch.h>
#include <linux/async.h>
#include <linux/percpu.h>
#include <linux/kmemleak.h>
@@ -984,6 +985,7 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
mod->exit();
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_GOING, mod);
+ klp_module_going(mod);
ftrace_release_mod(mod);
async_synchronize_full();
@@ -3315,6 +3317,7 @@ fail:
module_put(mod);
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_GOING, mod);
+ klp_module_going(mod);
ftrace_release_mod(mod);
free_module(mod);
wake_up_all(&module_wq);
@@ -3401,7 +3404,13 @@ out:
static int prepare_coming_module(struct module *mod)
{
+ int err;
+
ftrace_module_enable(mod);
+ err = klp_module_coming(mod);
+ if (err)
+ return err;
+
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_COMING, mod);
return 0;
@@ -3553,6 +3562,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
coming_cleanup:
blocking_notifier_call_chain(&module_notify_list,
MODULE_STATE_GOING, mod);
+ klp_module_going(mod);
bug_cleanup:
/* module_bug_cleanup needs module_mutex protection */