cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kuap.c (663B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2
      3#include <asm/kup.h>
      4#include <asm/smp.h>
      5
      6struct static_key_false disable_kuap_key;
      7EXPORT_SYMBOL(disable_kuap_key);
      8
      9void kuap_lock_all_ool(void)
     10{
     11	kuap_lock_all();
     12}
     13EXPORT_SYMBOL(kuap_lock_all_ool);
     14
     15void kuap_unlock_all_ool(void)
     16{
     17	kuap_unlock_all();
     18}
     19EXPORT_SYMBOL(kuap_unlock_all_ool);
     20
     21void setup_kuap(bool disabled)
     22{
     23	if (!disabled) {
     24		kuap_lock_all_ool();
     25		init_mm.context.sr0 |= SR_KS;
     26		current->thread.sr0 |= SR_KS;
     27	}
     28
     29	if (smp_processor_id() != boot_cpuid)
     30		return;
     31
     32	if (disabled)
     33		static_branch_enable(&disable_kuap_key);
     34	else
     35		pr_info("Activating Kernel Userspace Access Protection\n");
     36}