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Date: Wed, 28 Aug 2019 15:54:24 +0200
From: Christophe Leroy <christophe.leroy@....fr>
To: Russell Currey <ruscur@...sell.cc>, linuxppc-dev@...ts.ozlabs.org
Cc: kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v2] powerpc/mm: Implement STRICT_MODULE_RWX

Any plan to getting this applied soon ?

Christophe

Le 14/06/2019 à 07:50, Russell Currey a écrit :
> Strict module RWX is just like strict kernel RWX, but for modules - so
> loadable modules aren't marked both writable and executable at the same
> time.  This is handled by the generic code in kernel/module.c, and
> simply requires the architecture to implement the set_memory() set of
> functions, declared with ARCH_HAS_SET_MEMORY.
> 
> There's nothing other than these functions required to turn
> ARCH_HAS_STRICT_MODULE_RWX on, so turn that on too.
> 
> With STRICT_MODULE_RWX enabled, there are as many W+X pages at runtime
> as there are with CONFIG_MODULES=n (none), so in Russel's testing it works
> well on both Hash and Radix book3s64.
> 
> There's a TODO in the code for also applying the page permission changes
> to the backing pages in the linear mapping: this is pretty simple for
> Radix and (seemingly) a lot harder for Hash, so I've left it for now
> since there's still a notable security benefit for the patch as-is.
> 
> Technically can be enabled without STRICT_KERNEL_RWX, but
> that doesn't gets you a whole lot, so we should leave it off by default
> until we can get STRICT_KERNEL_RWX to the point where it's enabled by
> default.
> 
> Signed-off-by: Russell Currey <ruscur@...sell.cc>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
> Changes from v1 (sent by Christophe):
>   - return if VM_FLUSH_RESET_PERMS is set
> 
>   arch/powerpc/Kconfig                  |  2 +
>   arch/powerpc/include/asm/set_memory.h | 32 ++++++++++
>   arch/powerpc/mm/Makefile              |  2 +-
>   arch/powerpc/mm/pageattr.c            | 85 +++++++++++++++++++++++++++
>   4 files changed, 120 insertions(+), 1 deletion(-)
>   create mode 100644 arch/powerpc/include/asm/set_memory.h
>   create mode 100644 arch/powerpc/mm/pageattr.c
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 8c1c636308c8..3d98240ce965 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -131,7 +131,9 @@ config PPC
>   	select ARCH_HAS_PTE_SPECIAL
>   	select ARCH_HAS_MEMBARRIER_CALLBACKS
>   	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE && PPC64
> +	select ARCH_HAS_SET_MEMORY
>   	select ARCH_HAS_STRICT_KERNEL_RWX	if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
> +	select ARCH_HAS_STRICT_MODULE_RWX	if PPC_BOOK3S_64 || PPC32
>   	select ARCH_HAS_TICK_BROADCAST		if GENERIC_CLOCKEVENTS_BROADCAST
>   	select ARCH_HAS_UACCESS_FLUSHCACHE	if PPC64
>   	select ARCH_HAS_UBSAN_SANITIZE_ALL
> diff --git a/arch/powerpc/include/asm/set_memory.h b/arch/powerpc/include/asm/set_memory.h
> new file mode 100644
> index 000000000000..4b9683f3b3dd
> --- /dev/null
> +++ b/arch/powerpc/include/asm/set_memory.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +#ifndef _ASM_POWERPC_SET_MEMORY_H
> +#define _ASM_POWERPC_SET_MEMORY_H
> +
> +#define SET_MEMORY_RO	1
> +#define SET_MEMORY_RW	2
> +#define SET_MEMORY_NX	3
> +#define SET_MEMORY_X	4
> +
> +int change_memory(unsigned long addr, int numpages, int action);
> +
> +static inline int set_memory_ro(unsigned long addr, int numpages)
> +{
> +	return change_memory(addr, numpages, SET_MEMORY_RO);
> +}
> +
> +static inline int set_memory_rw(unsigned long addr, int numpages)
> +{
> +	return change_memory(addr, numpages, SET_MEMORY_RW);
> +}
> +
> +static inline int set_memory_nx(unsigned long addr, int numpages)
> +{
> +	return change_memory(addr, numpages, SET_MEMORY_NX);
> +}
> +
> +static inline int set_memory_x(unsigned long addr, int numpages)
> +{
> +	return change_memory(addr, numpages, SET_MEMORY_X);
> +}
> +
> +#endif
> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
> index 0f499db315d6..b683d1c311b3 100644
> --- a/arch/powerpc/mm/Makefile
> +++ b/arch/powerpc/mm/Makefile
> @@ -7,7 +7,7 @@ ccflags-$(CONFIG_PPC64)	:= $(NO_MINIMAL_TOC)
>   
>   obj-y				:= fault.o mem.o pgtable.o mmap.o \
>   				   init_$(BITS).o pgtable_$(BITS).o \
> -				   pgtable-frag.o \
> +				   pgtable-frag.o pageattr.o \
>   				   init-common.o mmu_context.o drmem.o
>   obj-$(CONFIG_PPC_MMU_NOHASH)	+= nohash/
>   obj-$(CONFIG_PPC_BOOK3S_32)	+= book3s32/
> diff --git a/arch/powerpc/mm/pageattr.c b/arch/powerpc/mm/pageattr.c
> new file mode 100644
> index 000000000000..41baf92f632b
> --- /dev/null
> +++ b/arch/powerpc/mm/pageattr.c
> @@ -0,0 +1,85 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Page attribute and set_memory routines
> + *
> + * Derived from the arm64 implementation.
> + *
> + * Author: Russell Currey <ruscur@...sell.cc>
> + *
> + * Copyright 2019, IBM Corporation.
> + *
> + */
> +
> +#include <linux/mm.h>
> +#include <linux/set_memory.h>
> +#include <linux/vmalloc.h>
> +
> +#include <asm/mmu.h>
> +#include <asm/page.h>
> +#include <asm/pgtable.h>
> +
> +static int change_page_ro(pte_t *ptep, pgtable_t token, unsigned long addr, void *data)
> +{
> +	set_pte_at(&init_mm, addr, ptep, pte_wrprotect(READ_ONCE(*ptep)));
> +	return 0;
> +}
> +
> +static int change_page_rw(pte_t *ptep, pgtable_t token, unsigned long addr, void *data)
> +{
> +	set_pte_at(&init_mm, addr, ptep, pte_mkwrite(READ_ONCE(*ptep)));
> +	return 0;
> +}
> +
> +static int change_page_nx(pte_t *ptep, pgtable_t token, unsigned long addr, void *data)
> +{
> +	set_pte_at(&init_mm, addr, ptep, pte_exprotect(READ_ONCE(*ptep)));
> +	return 0;
> +}
> +
> +static int change_page_x(pte_t *ptep, pgtable_t token, unsigned long addr, void *data)
> +{
> +	set_pte_at(&init_mm, addr, ptep, pte_mkexec(READ_ONCE(*ptep)));
> +	return 0;
> +}
> +
> +int change_memory(unsigned long addr, int numpages, int action)
> +{
> +	unsigned long size = numpages * PAGE_SIZE;
> +	unsigned long start = ALIGN_DOWN(addr, PAGE_SIZE);
> +	unsigned long end = start + size;
> +	struct vm_struct *area;
> +	int ret;
> +
> +	if (!numpages)
> +		return 0;
> +
> +	// only operate on VM areas for now
> +	area = find_vm_area((void *)addr);
> +	if (!area || end > (unsigned long)area->addr + area->size ||
> +	    !(area->flags & VM_ALLOC) || (area->flags & VM_FLUSH_RESET_PERMS))
> +		return -EINVAL;
> +
> +	// TODO: also apply change to the backing pages in the linear mapping
> +
> +	switch (action) {
> +	case SET_MEMORY_RO:
> +		ret = apply_to_page_range(&init_mm, start, size, change_page_ro, NULL);
> +		break;
> +	case SET_MEMORY_RW:
> +		ret = apply_to_page_range(&init_mm, start, size, change_page_rw, NULL);
> +		break;
> +	case SET_MEMORY_NX:
> +		ret = apply_to_page_range(&init_mm, start, size, change_page_nx, NULL);
> +		break;
> +	case SET_MEMORY_X:
> +		ret = apply_to_page_range(&init_mm, start, size, change_page_x, NULL);
> +		break;
> +	default:
> +		WARN_ON(true);
> +		return -EINVAL;
> +	}
> +
> +	flush_tlb_kernel_range(start, end);
> +	return ret;
> +}
> 

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