Commit 7a3d8e41 authored by Zheng Yejian's avatar Zheng Yejian
Browse files

livepatch/arm: Add arch_klp_module_check_calltrace 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8MGE6



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

Add arch_klp_module_check_calltrace to check whether stacks of all tasks
are within the code segment of module.

Signed-off-by: default avatarYang Jihong <yangjihong1@huawei.com>
Signed-off-by: default avatarZheng Yejian <zhengyejian1@huawei.com>
parent 38a4efc6

arch/arm/include/asm/livepatch.h

+1 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ bool arch_check_jump_insn(unsigned long func_addr); 
int arch_klp_check_calltrace(bool (*check_func)(void *, int *, unsigned long), void *data);

int arch_klp_add_breakpoint(struct arch_klp_data *arch_data, void *old_func);

void arch_klp_remove_breakpoint(struct arch_klp_data *arch_data, void *old_func);

int arch_klp_module_check_calltrace(void *data);



#endif /* CONFIG_LIVEPATCH_WO_FTRACE */

arch/arm/kernel/livepatch.c

+22 −0
Original line number Diff line number Diff line
@@ -142,6 +142,28 @@ int arch_klp_check_calltrace(bool (*check_func)(void *, int *, unsigned long), v 
	return do_check_calltrace(&args, klp_check_jump_func);

}



static bool check_module_calltrace(void *ws_args, unsigned long pc)

{

	struct walk_stackframe_args *args = ws_args;

	struct module *mod = args->data;



	if (within_module_core(pc, mod)) {

		pr_err("module %s is in use!\n", mod->name);

		return (args->ret = -EBUSY);

	}

	return 0;

}



int arch_klp_module_check_calltrace(void *data)

{

	struct walk_stackframe_args args = {

		.data = data,

		.ret = 0

	};



	return do_check_calltrace(&args, check_module_calltrace);

}



int arch_klp_add_breakpoint(struct arch_klp_data *arch_data, void *old_func)

{

	u32 *addr = (u32 *)old_func;