diff options
| -rw-r--r-- | arch/parisc/Kconfig | 5 | ||||
| -rw-r--r-- | arch/parisc/include/asm/kfence.h | 44 | ||||
| -rw-r--r-- | arch/parisc/kernel/traps.c | 5 |
3 files changed, 52 insertions, 2 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index aee25beb2d00..906187a412ec 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -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 diff --git a/arch/parisc/include/asm/kfence.h b/arch/parisc/include/asm/kfence.h new file mode 100644 index 000000000000..6259e5ac1fea --- /dev/null +++ b/arch/parisc/include/asm/kfence.h @@ -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 */ diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index 747c328fb886..524781eae4dd 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -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); } |