Commit d6749cb4 authored by Zheng Yejian's avatar Zheng Yejian
Browse files

livepatch/ppc32: Implement arch_klp_check_task_calltrace() 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9R2TB



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

Signed-off-by: default avatarZheng Yejian <zhengyejian1@huawei.com>
parent 8e77a794

arch/powerpc/kernel/livepatch_32.c

+63 −35
Original line number Diff line number Diff line
@@ -233,14 +233,12 @@ static int klp_check_jump_func(struct stackframe *frame, void *ws_args) 
	return 0;

}



static int do_check_calltrace(struct walk_stackframe_args *args,

static int check_task_calltrace(struct task_struct *t,

				struct walk_stackframe_args *args,

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

{

	struct task_struct *g, *t;

	unsigned long *stack;



	for_each_process_thread(g, t) {

	struct stackframe frame = { 0 };

	unsigned long *stack;



	if (t == current) {

		/*
@@ -251,8 +249,6 @@ static int do_check_calltrace(struct walk_stackframe_args *args, 
		 * backtrace is so similar

		 */

		stack = (unsigned long *)current_stack_pointer;

		} else if (klp_is_migration_thread(t->comm)) {

			continue;

	} else {

		/*

		 * Skip the first frame since it does not contain lr
@@ -263,7 +259,7 @@ static int do_check_calltrace(struct walk_stackframe_args *args, 
		unsigned long s = *(unsigned long *)t->thread.ksp;



		if (!validate_sp(s, t, STACK_FRAME_OVERHEAD))

				continue;

			return 0;

		stack = (unsigned long *)s;

	}
@@ -275,10 +271,42 @@ static int do_check_calltrace(struct walk_stackframe_args *args, 
		show_stack(t, NULL, KERN_INFO);

		return args->ret;

	}

	return 0;

}



static int do_check_calltrace(struct walk_stackframe_args *args,

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

{

	int ret;

	struct task_struct *g, *t;



	for_each_process_thread(g, t) {

		if (klp_is_migration_thread(t->comm))

			continue;

		ret = check_task_calltrace(t, args, fn);

		if (ret)

			return ret;

	}

	return 0;

}



#ifdef CONFIG_LIVEPATCH_BREAKPOINT_NO_STOP_MACHINE

int arch_klp_check_task_calltrace(struct task_struct *t,

				  bool (*check_func)(void *, int *, unsigned long),

				  void *data)

{

	struct walk_stackframe_args args = {

		.data = data,

		.ret = 0,

		.check_func = check_func,

	};



	if (t == NULL)

		return -EINVAL;

	return check_task_calltrace(t, &args, klp_check_jump_func);

}

#endif



int arch_klp_check_calltrace(bool (*check_func)(void *, int *, unsigned long), void *data)

{

	struct walk_stackframe_args args = {