Commit 8b458d5f authored by Yang Jihong's avatar Yang Jihong Committed by Zheng Zengkai
Browse files

livepatch/powerpc64: Add do_check_calltrace 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5CJ7X



--------------------------------

The calltrace check code is independent as do_check_calltrace,
for calltrace check of module.
No functional change.

Signed-off-by: default avatarYang Jihong <yangjihong1@huawei.com>
Reviewed-by: default avatarXu Kuohai <xukuohai@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 1daef7b0

arch/powerpc/kernel/livepatch_64.c

+30 −22
Original line number Diff line number Diff line
@@ -339,22 +339,12 @@ static void free_list(struct klp_func_list **funcs) 
	}

}



int klp_check_calltrace(struct klp_patch *patch, int enable)

static int do_check_calltrace(struct walk_stackframe_args *args,

			      int (*fn)(struct stackframe *, void *))

{

	struct task_struct *g, *t;

	struct stackframe frame;

	unsigned long *stack;

	int ret = 0;

	struct klp_func_list *check_funcs = NULL;

	struct walk_stackframe_args args;



	ret = klp_check_activeness_func(patch, enable, &check_funcs);

	if (ret) {

		pr_err("collect active functions failed, ret=%d\n", ret);

		goto out;

	}

	args.check_funcs = check_funcs;

	args.ret = 0;



	for_each_process_thread(g, t) {

		if (t == current) {
@@ -396,19 +386,37 @@ int klp_check_calltrace(struct klp_patch *patch, int enable) 
		frame.sp = (unsigned long)stack;

		frame.pc = stack[STACK_FRAME_LR_SAVE];

		frame.nip = 0;

		if (check_funcs != NULL) {

			klp_walk_stackframe(&frame, klp_check_jump_func, t, &args);

			if (args.ret) {

				ret = args.ret;

		klp_walk_stackframe(&frame, fn, t, args);

		if (args->ret) {

			pr_debug("%s FAILED when %s\n", __func__,

					 enable ? "enabling" : "disabling");

				 args->enable ? "enabling" : "disabling");

			pr_info("PID: %d Comm: %.20s\n", t->pid, t->comm);

			show_stack(t, NULL, KERN_INFO);

				goto out;

			return args->ret;

		}

	}

	return 0;

}



int klp_check_calltrace(struct klp_patch *patch, int enable)

{

	int ret = 0;

	struct klp_func_list *check_funcs = NULL;

	struct walk_stackframe_args args;



	ret = klp_check_activeness_func(patch, enable, &check_funcs);

	if (ret) {

		pr_err("collect active functions failed, ret=%d\n", ret);

		goto out;

	}

	if (!check_funcs)

		goto out;



	args.check_funcs = check_funcs;

	args.ret = 0;

	args.enable = enable;

	ret = do_check_calltrace(&args, klp_check_jump_func);



out:

	free_list(&check_funcs);

	return ret;