cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

kup.c (719B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * This file contains the routines for initializing kernel userspace protection
      4 */
      5
      6#include <linux/export.h>
      7#include <linux/init.h>
      8#include <linux/jump_label.h>
      9#include <linux/printk.h>
     10#include <linux/smp.h>
     11
     12#include <asm/kup.h>
     13#include <asm/smp.h>
     14
     15#ifdef CONFIG_PPC_KUAP
     16struct static_key_false disable_kuap_key;
     17EXPORT_SYMBOL(disable_kuap_key);
     18
     19void setup_kuap(bool disabled)
     20{
     21	if (disabled) {
     22		if (IS_ENABLED(CONFIG_40x))
     23			disable_kuep = true;
     24		if (smp_processor_id() == boot_cpuid)
     25			static_branch_enable(&disable_kuap_key);
     26		return;
     27	}
     28
     29	pr_info("Activating Kernel Userspace Access Protection\n");
     30
     31	__prevent_user_access(KUAP_READ_WRITE);
     32}
     33#endif