C++ (Cpp) arch_check_va_in_kernelspace Exemples

Exemple #1

Fichier : hw_breakpoint.c Projet : A2109devs/lenovo_a2109a_kernel

/*
 * Validate the arch-specific HW Breakpoint register settings
 */
int arch_validate_hwbkpt_settings(struct perf_event *bp,
				  struct task_struct *tsk)
{
	struct arch_hw_breakpoint *info = counter_arch_bp(bp);
	unsigned int align;
	int ret;

	ret = arch_build_bp_info(bp);
	if (ret)
		return ret;

	ret = -EINVAL;

	switch (info->len) {
	case SH_BREAKPOINT_LEN_1:
		align = 0;
		break;
	case SH_BREAKPOINT_LEN_2:
		align = 1;
		break;
	case SH_BREAKPOINT_LEN_4:
		align = 3;
		break;
	case SH_BREAKPOINT_LEN_8:
		align = 7;
		break;
	default:
		return ret;
	}

	/*
	 * For kernel-addresses, either the address or symbol name can be
	 * specified.
	 */
	if (info->name)
		info->address = (unsigned long)kallsyms_lookup_name(info->name);

	/*
	 * Check that the low-order bits of the address are appropriate
	 * for the alignment implied by len.
	 */
	if (info->address & align)
		return -EINVAL;

	/* Check that the virtual address is in the proper range */
	if (tsk) {
		if (!arch_check_va_in_userspace(info->address, info->len))
			return -EFAULT;
	} else {
		if (!arch_check_va_in_kernelspace(info->address, info->len))
			return -EFAULT;
	}

	return 0;
}

Exemple #2

/*
 * Validate the arch-specific HW Breakpoint register settings
 */
int arch_validate_hwbkpt_settings(struct perf_event *bp,
				  struct task_struct *tsk)
{
	struct arch_hw_breakpoint *info = counter_arch_bp(bp);
	unsigned int align;
	int ret;


	ret = arch_build_bp_info(bp);
	if (ret)
		return ret;

	ret = -EINVAL;

	if (info->type == X86_BREAKPOINT_EXECUTE)
		/*
		 * Ptrace-refactoring code
		 * For now, we'll allow instruction breakpoint only for user-space
		 * addresses
		 */
		if ((!arch_check_va_in_userspace(info->address, info->len)) &&
			info->len != X86_BREAKPOINT_EXECUTE)
			return ret;

	switch (info->len) {
	case X86_BREAKPOINT_LEN_1:
		align = 0;
		break;
	case X86_BREAKPOINT_LEN_2:
		align = 1;
		break;
	case X86_BREAKPOINT_LEN_4:
		align = 3;
		break;
#ifdef CONFIG_X86_64
	case X86_BREAKPOINT_LEN_8:
		align = 7;
		break;
#endif
	default:
		return ret;
	}

	/*
	 * For kernel-addresses, either the address or symbol name can be
	 * specified.
	 */
	if (info->name)
		info->address = (unsigned long)
				kallsyms_lookup_name(info->name);
	/*
	 * Check that the low-order bits of the address are appropriate
	 * for the alignment implied by len.
	 */
	if (info->address & align)
		return -EINVAL;

	/* Check that the virtual address is in the proper range */
	if (tsk) {
		if (!arch_check_va_in_userspace(info->address, info->len))
			return -EFAULT;
	} else {
		if (!arch_check_va_in_kernelspace(info->address, info->len))
			return -EFAULT;
	}

	return 0;
}