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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching

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Pull livepatching updates from Jiri Kosina:
 "Code cleanups from Kamalesh Babulal"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
  livepatch: Validate module/old func name length
  livepatch: Remove reliable stacktrace check in klp_try_switch_task()
This commit is contained in:
Linus Torvalds 2018-08-20 16:10:47 -07:00
commit 3933ec73cd
2 changed files with 6 additions and 7 deletions
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6
kernel/livepatch/core.c
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@ -678,6 +678,9 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
if (!func->old_name || !func->new_func)
return -EINVAL;
if (strlen(func->old_name) >= KSYM_NAME_LEN)
return -EINVAL;
INIT_LIST_HEAD(&func->stack_node);
func->patched = false;
func->transition = false;
@ -751,6 +754,9 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
if (!obj->funcs)
return -EINVAL;
if (klp_is_module(obj) && strlen(obj->name) >= MODULE_NAME_LEN)
return -EINVAL;
obj->patched = false;
obj->mod = NULL;

7
kernel/livepatch/transition.c
View file

@ -309,13 +309,6 @@ static bool klp_try_switch_task(struct task_struct *task)
if (task->patch_state == klp_target_state)
return true;
/*
* For arches which don't have reliable stack traces, we have to rely
* on other methods (e.g., switching tasks at kernel exit).
*/
if (!klp_have_reliable_stack())
return false;
/*
* Now try to check the stack for any to-be-patched or to-be-unpatched
* functions. If all goes well, switch the task to the target patch