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parisc: Add KFENCE support

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Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2021-10-09 22:21:49 +02:00
parent aeb1e833a4
commit ec5c115050
3 changed files with 52 additions and 2 deletions
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5
arch/parisc/Kconfig
View File

@ -48,6 +48,7 @@ config PARISC
select HAVE_ARCH_HASH
select HAVE_ARCH_JUMP_LABEL
select HAVE_ARCH_JUMP_LABEL_RELATIVE
select HAVE_ARCH_KFENCE
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_REGS_AND_STACK_ACCESS_API
@ -254,11 +255,11 @@ config PARISC_PAGE_SIZE_4KB
config PARISC_PAGE_SIZE_16KB
bool "16KB"
depends on PA8X00 && BROKEN
depends on PA8X00 && BROKEN && !KFENCE
config PARISC_PAGE_SIZE_64KB
bool "64KB"
depends on PA8X00 && BROKEN
depends on PA8X00 && BROKEN && !KFENCE
endchoice

44
arch/parisc/include/asm/kfence.h Normal file
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@ -0,0 +1,44 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* PA-RISC KFENCE support.
*
* Copyright (C) 2021, Helge Deller <deller@gmx.de>
*/
#ifndef _ASM_PARISC_KFENCE_H
#define _ASM_PARISC_KFENCE_H
#include <linux/kfence.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
static inline bool arch_kfence_init_pool(void)
{
return true;
}
/* Protect the given page and flush TLB. */
static inline bool kfence_protect_page(unsigned long addr, bool protect)
{
pte_t *pte = virt_to_kpte(addr);
if (WARN_ON(!pte))
return false;
/*
* We need to avoid IPIs, as we may get KFENCE allocations or faults
* with interrupts disabled.
*/
if (protect)
set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
else
set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
return true;
}
#endif /* _ASM_PARISC_KFENCE_H */

5
arch/parisc/kernel/traps.c
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@ -30,6 +30,7 @@
#include <linux/ratelimit.h>
#include <linux/uaccess.h>
#include <linux/kdebug.h>
#include <linux/kfence.h>
#include <asm/assembly.h>
#include <asm/io.h>
@ -787,6 +788,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
/* Clean up and return if in exception table. */
if (fixup_exception(regs))
return;
/* Clean up and return if handled by kfence. */
if (kfence_handle_page_fault(fault_address,
parisc_acctyp(code, regs->iir) == VM_WRITE, regs))
return;
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
parisc_terminate("Kernel Fault", regs, code, fault_address);
}