diff options
Diffstat (limited to 'arch/powerpc/include/asm/kfence.h')
-rw-r--r-- | arch/powerpc/include/asm/kfence.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kfence.h b/arch/powerpc/include/asm/kfence.h new file mode 100644 index 0000000000..424ceef82a --- /dev/null +++ b/arch/powerpc/include/asm/kfence.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * powerpc KFENCE support. + * + * Copyright (C) 2020 CS GROUP France + */ + +#ifndef __ASM_POWERPC_KFENCE_H +#define __ASM_POWERPC_KFENCE_H + +#include <linux/mm.h> +#include <asm/pgtable.h> + +#ifdef CONFIG_PPC64_ELF_ABI_V1 +#define ARCH_FUNC_PREFIX "." +#endif + +static inline bool arch_kfence_init_pool(void) +{ + return true; +} + +#ifdef CONFIG_PPC64 +static inline bool kfence_protect_page(unsigned long addr, bool protect) +{ + struct page *page = virt_to_page((void *)addr); + + __kernel_map_pages(page, 1, !protect); + + return true; +} +#else +static inline bool kfence_protect_page(unsigned long addr, bool protect) +{ + pte_t *kpte = virt_to_kpte(addr); + + if (protect) { + pte_update(&init_mm, addr, kpte, _PAGE_PRESENT, 0, 0); + flush_tlb_kernel_range(addr, addr + PAGE_SIZE); + } else { + pte_update(&init_mm, addr, kpte, 0, _PAGE_PRESENT, 0); + } + + return true; +} +#endif + +#endif /* __ASM_POWERPC_KFENCE_H */ |