From: Balbir Singh <bsingharora@gmail.com>
To: Ram Pai <linuxram@us.ibm.com>
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
benh@kernel.crashing.org, paulus@samba.org,
khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com,
hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com,
ebiederm@xmission.com
Subject: Re: [PATCH 01/25] powerpc: initial pkey plumbing
Date: Thu, 14 Sep 2017 13:32:05 +1000 [thread overview]
Message-ID: <20170914133205.5542e70b@firefly.ozlabs.ibm.com> (raw)
In-Reply-To: <1504910713-7094-10-git-send-email-linuxram@us.ibm.com>
On Fri, 8 Sep 2017 15:44:49 -0700
Ram Pai <linuxram@us.ibm.com> wrote:
> Basic plumbing to initialize the pkey system.
> Nothing is enabled yet. A later patch will enable it
> ones all the infrastructure is in place.
>
> Signed-off-by: Ram Pai <linuxram@us.ibm.com>
> ---
> arch/powerpc/Kconfig | 16 +++++++++++
> arch/powerpc/include/asm/mmu_context.h | 5 +++
> arch/powerpc/include/asm/pkeys.h | 45 ++++++++++++++++++++++++++++++++
> arch/powerpc/kernel/setup_64.c | 4 +++
> arch/powerpc/mm/Makefile | 1 +
> arch/powerpc/mm/hash_utils_64.c | 1 +
> arch/powerpc/mm/pkeys.c | 33 +++++++++++++++++++++++
> 7 files changed, 105 insertions(+), 0 deletions(-)
> create mode 100644 arch/powerpc/include/asm/pkeys.h
> create mode 100644 arch/powerpc/mm/pkeys.c
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 9fc3c0b..a4cd210 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -864,6 +864,22 @@ config SECCOMP
>
> If unsure, say Y. Only embedded should say N here.
>
> +config PPC64_MEMORY_PROTECTION_KEYS
> + prompt "PowerPC Memory Protection Keys"
> + def_bool y
> + # Note: only available in 64-bit mode
> + depends on PPC64
This is not sufficient right, you need PPC_BOOK3S_64
for compile time at-least?
> + select ARCH_USES_HIGH_VMA_FLAGS
> + select ARCH_HAS_PKEYS
> + ---help---
> + Memory Protection Keys provides a mechanism for enforcing
> + page-based protections, but without requiring modification of the
> + page tables when an application changes protection domains.
> +
> + For details, see Documentation/vm/protection-keys.txt
> +
> + If unsure, say y.
> +
> endmenu
>
> config ISA_DMA_API
> diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
> index 3095925..7badf29 100644
> --- a/arch/powerpc/include/asm/mmu_context.h
> +++ b/arch/powerpc/include/asm/mmu_context.h
> @@ -141,5 +141,10 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
> /* by default, allow everything */
> return true;
> }
> +
> +#ifndef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
> +#define pkey_initialize()
> +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
> +
> #endif /* __KERNEL__ */
> #endif /* __ASM_POWERPC_MMU_CONTEXT_H */
> diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
> new file mode 100644
> index 0000000..c02305a
> --- /dev/null
> +++ b/arch/powerpc/include/asm/pkeys.h
> @@ -0,0 +1,45 @@
> +#ifndef _ASM_PPC64_PKEYS_H
> +#define _ASM_PPC64_PKEYS_H
> +
> +extern bool pkey_inited;
> +extern bool pkey_execute_disable_support;
> +#define ARCH_VM_PKEY_FLAGS 0
> +
> +static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
> +{
> + return (pkey == 0);
> +}
> +
> +static inline int mm_pkey_alloc(struct mm_struct *mm)
> +{
> + return -1;
> +}
> +
> +static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
> +{
> + return -EINVAL;
> +}
> +
> +/*
> + * Try to dedicate one of the protection keys to be used as an
> + * execute-only protection key.
> + */
> +static inline int execute_only_pkey(struct mm_struct *mm)
> +{
> + return 0;
> +}
> +
> +static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma,
> + int prot, int pkey)
> +{
> + return 0;
> +}
> +
> +static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
> + unsigned long init_val)
> +{
> + return 0;
> +}
> +
> +extern void pkey_initialize(void);
> +#endif /*_ASM_PPC64_PKEYS_H */
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index b89c6aa..3b67014 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -37,6 +37,7 @@
> #include <linux/memblock.h>
> #include <linux/memory.h>
> #include <linux/nmi.h>
> +#include <linux/pkeys.h>
>
> #include <asm/io.h>
> #include <asm/kdump.h>
> @@ -316,6 +317,9 @@ void __init early_setup(unsigned long dt_ptr)
> /* Initialize the hash table or TLB handling */
> early_init_mmu();
>
> + /* initialize the key subsystem */
> + pkey_initialize();
> +
> /*
> * At this point, we can let interrupts switch to virtual mode
> * (the MMU has been setup), so adjust the MSR in the PACA to
> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
> index fb844d2..927620a 100644
> --- a/arch/powerpc/mm/Makefile
> +++ b/arch/powerpc/mm/Makefile
> @@ -43,3 +43,4 @@ obj-$(CONFIG_PPC_COPRO_BASE) += copro_fault.o
> obj-$(CONFIG_SPAPR_TCE_IOMMU) += mmu_context_iommu.o
> obj-$(CONFIG_PPC_PTDUMP) += dump_linuxpagetables.o
> obj-$(CONFIG_PPC_HTDUMP) += dump_hashpagetable.o
> +obj-$(CONFIG_PPC64_MEMORY_PROTECTION_KEYS) += pkeys.o
> diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
> index 0dff57b..67f62b5 100644
> --- a/arch/powerpc/mm/hash_utils_64.c
> +++ b/arch/powerpc/mm/hash_utils_64.c
> @@ -35,6 +35,7 @@
> #include <linux/memblock.h>
> #include <linux/context_tracking.h>
> #include <linux/libfdt.h>
> +#include <linux/pkeys.h>
>
> #include <asm/debugfs.h>
> #include <asm/processor.h>
> diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c
> new file mode 100644
> index 0000000..418a05b
> --- /dev/null
> +++ b/arch/powerpc/mm/pkeys.c
> @@ -0,0 +1,33 @@
> +/*
> + * PowerPC Memory Protection Keys management
> + * Copyright (c) 2015, Intel Corporation.
> + * Copyright (c) 2017, IBM Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +#include <linux/pkeys.h> /* PKEY_* */
> +
> +bool pkey_inited;
> +bool pkey_execute_disable_support;
> +
> +void __init pkey_initialize(void)
> +{
> + /* disable the pkey system till everything
> + * is in place. A patch further down the
> + * line will enable it.
> + */
Comment style is broken
> + pkey_inited = false;
> +
> + /*
> + * disable execute_disable support for now.
> + * A patch further down will enable it.
> + */
> + pkey_execute_disable_support = false;
> +}
Balbir Singh.
next prev parent reply other threads:[~2017-09-14 3:32 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-08 22:44 [PATCH 0/7] powerpc: Free up RPAGE_RSV bits Ram Pai
2017-09-08 22:44 ` [PATCH 1/7] powerpc: introduce pte_set_hash_slot() helper Ram Pai
2017-09-13 7:55 ` Balbir Singh
2017-10-19 4:52 ` Michael Ellerman
2017-09-08 22:44 ` [PATCH 2/7] powerpc: introduce pte_get_hash_gslot() helper Ram Pai
2017-09-13 9:32 ` Balbir Singh
2017-09-13 20:10 ` Ram Pai
2017-09-08 22:44 ` [PATCH 3/7] powerpc: Free up four 64K PTE bits in 4K backed HPTE pages Ram Pai
2017-09-14 1:18 ` Balbir Singh
2017-10-19 3:25 ` Michael Ellerman
2017-10-19 17:02 ` Ram Pai
2017-10-23 8:47 ` Aneesh Kumar K.V
2017-10-23 16:29 ` Ram Pai
2017-10-25 9:18 ` Michael Ellerman
2017-10-26 6:08 ` Ram Pai
2017-09-08 22:44 ` [PATCH 4/7] powerpc: Free up four 64K PTE bits in 64K " Ram Pai
2017-09-14 1:44 ` Balbir Singh
2017-09-14 17:54 ` Ram Pai
2017-09-14 18:25 ` Ram Pai
2017-09-14 8:13 ` Benjamin Herrenschmidt
2017-10-23 8:52 ` Aneesh Kumar K.V
2017-10-23 23:42 ` Ram Pai
2017-10-23 19:22 ` Ram Pai
2017-10-24 3:37 ` Aneesh Kumar K.V
2017-09-08 22:44 ` [PATCH 5/7] powerpc: Swizzle around 4K PTE bits to free up bit 5 and bit 6 Ram Pai
2017-09-14 1:48 ` Balbir Singh
2017-09-14 17:23 ` Ram Pai
2017-09-08 22:44 ` [PATCH 6/7] powerpc: use helper functions to get and set hash slots Ram Pai
2017-09-08 22:44 ` [PATCH 7/7] powerpc: capture the PTE format changes in the dump pte report Ram Pai
2017-09-14 3:22 ` Balbir Singh
2017-09-14 17:19 ` Ram Pai
2017-09-08 22:44 ` [PATCH 00/25] powerpc: Memory Protection Keys Ram Pai
2017-09-08 22:44 ` [PATCH 01/25] powerpc: initial pkey plumbing Ram Pai
2017-09-14 3:32 ` Balbir Singh [this message]
2017-09-14 16:17 ` Ram Pai
2017-10-19 4:20 ` Michael Ellerman
2017-10-19 17:11 ` Ram Pai
2017-10-24 8:17 ` Michael Ellerman
2017-09-08 22:44 ` [PATCH 02/25] powerpc: define an additional vma bit for protection keys Ram Pai
2017-09-14 4:38 ` Balbir Singh
2017-09-14 8:11 ` Benjamin Herrenschmidt
2017-10-23 21:06 ` Ram Pai
2017-09-14 16:15 ` Ram Pai
2017-10-23 9:25 ` Aneesh Kumar K.V
2017-10-23 9:28 ` Aneesh Kumar K.V
2017-10-23 17:57 ` Ram Pai
2017-10-23 17:43 ` Ram Pai
2017-09-08 22:44 ` [PATCH 03/25] powerpc: track allocation status of all pkeys Ram Pai
2017-10-07 10:02 ` Michael Ellerman
2017-10-08 23:02 ` Ram Pai
2017-10-18 2:47 ` Balbir Singh
2017-10-23 9:41 ` Aneesh Kumar K.V
2017-10-23 18:14 ` Ram Pai
2017-10-24 6:28 ` Aneesh Kumar K.V
2017-10-24 7:23 ` Ram Pai
2017-09-08 22:44 ` [PATCH 04/25] powerpc: helper function to read, write AMR, IAMR, UAMOR registers Ram Pai
2017-10-18 3:17 ` [PATCH 04/25] powerpc: helper function to read,write AMR,IAMR,UAMOR registers Balbir Singh
2017-10-18 3:42 ` Ram Pai
2017-09-08 22:44 ` [PATCH 05/25] powerpc: helper functions to initialize AMR, IAMR and UAMOR registers Ram Pai
2017-10-18 3:24 ` Balbir Singh
2017-10-18 20:38 ` Ram Pai
2017-10-24 6:25 ` Aneesh Kumar K.V
2017-10-24 7:04 ` Ram Pai
2017-10-24 8:29 ` Michael Ellerman
2017-09-08 22:44 ` [PATCH 06/25] powerpc: cleaup AMR, iAMR when a key is allocated or freed Ram Pai
2017-10-18 3:34 ` [PATCH 06/25] powerpc: cleaup AMR,iAMR " Balbir Singh
2017-10-23 9:43 ` [PATCH 06/25] powerpc: cleaup AMR, iAMR " Aneesh Kumar K.V
2017-10-23 18:36 ` [PATCH 06/25] powerpc: cleaup AMR,iAMR " Ram Pai
2017-10-23 9:43 ` [PATCH 06/25] powerpc: cleaup AMR, iAMR " Aneesh Kumar K.V
2017-10-23 18:29 ` [PATCH 06/25] powerpc: cleaup AMR,iAMR " Ram Pai
2017-09-08 22:44 ` [PATCH 07/25] powerpc: implementation for arch_set_user_pkey_access() Ram Pai
2017-09-08 22:44 ` [PATCH 08/25] powerpc: sys_pkey_alloc() and sys_pkey_free() system calls Ram Pai
2017-10-24 15:48 ` Michael Ellerman
2017-10-24 18:34 ` Ram Pai
2017-10-25 9:26 ` Michael Ellerman
2017-09-08 22:44 ` [PATCH 09/25] powerpc: ability to create execute-disabled pkeys Ram Pai
2017-10-18 3:42 ` Balbir Singh
2017-10-18 5:15 ` Ram Pai
2017-10-24 6:58 ` Aneesh Kumar K.V
2017-10-24 7:20 ` Ram Pai
2017-10-24 4:36 ` Aneesh Kumar K.V
2017-10-28 23:18 ` Ram Pai
2017-09-08 22:44 ` [PATCH 10/25] powerpc: store and restore the pkey state across context switches Ram Pai
2017-10-18 3:49 ` Balbir Singh
2017-10-18 20:47 ` Ram Pai
2017-10-18 23:00 ` Balbir Singh
2017-10-19 0:52 ` Ram Pai
2017-09-08 22:44 ` [PATCH 11/25] powerpc: introduce execute-only pkey Ram Pai
2017-10-18 4:15 ` Balbir Singh
2017-10-18 20:57 ` Ram Pai
2017-10-18 23:02 ` Balbir Singh
2017-10-19 15:52 ` Ram Pai
2017-09-08 22:45 ` [PATCH 12/25] powerpc: ability to associate pkey to a vma Ram Pai
2017-10-18 4:27 ` Balbir Singh
2017-10-18 21:01 ` Ram Pai
2017-09-08 22:45 ` [PATCH 13/25] powerpc: implementation for arch_override_mprotect_pkey() Ram Pai
2017-10-18 4:36 ` Balbir Singh
2017-10-18 21:10 ` Ram Pai
2017-10-18 23:04 ` Balbir Singh
2017-10-19 16:39 ` Ram Pai
2017-09-08 22:45 ` [PATCH 14/25] powerpc: map vma key-protection bits to pte key bits Ram Pai
2017-10-18 4:39 ` Balbir Singh
2017-10-18 21:14 ` Ram Pai
2017-09-08 22:45 ` [PATCH 15/25] powerpc: sys_pkey_mprotect() system call Ram Pai
2017-09-08 22:45 ` [PATCH 16/25] powerpc: Program HPTE key protection bits Ram Pai
2017-10-18 4:43 ` Balbir Singh
2017-09-08 22:45 ` [PATCH 17/25] powerpc: helper to validate key-access permissions of a pte Ram Pai
2017-10-18 4:48 ` Balbir Singh
2017-10-18 21:19 ` Ram Pai
2017-09-08 22:45 ` [PATCH 18/25] powerpc: check key protection for user page access Ram Pai
2017-10-18 19:57 ` Balbir Singh
2017-10-18 21:29 ` Ram Pai
2017-10-18 23:08 ` Balbir Singh
2017-10-19 16:46 ` Ram Pai
2017-09-08 22:45 ` [PATCH 19/25] powerpc: implementation for arch_vma_access_permitted() Ram Pai
2017-10-18 23:20 ` Balbir Singh
2017-10-24 15:48 ` Michael Ellerman
2017-09-08 22:45 ` [PATCH 20/25] powerpc: Handle exceptions caused by pkey violation Ram Pai
2017-10-18 23:27 ` Balbir Singh
2017-10-19 16:53 ` Ram Pai
2017-10-24 15:47 ` Michael Ellerman
2017-10-24 18:26 ` Ram Pai
2017-10-29 14:03 ` Aneesh Kumar K.V
2017-10-30 0:37 ` Ram Pai
2017-09-08 22:45 ` [PATCH 21/25] powerpc: introduce get_pte_pkey() helper Ram Pai
2017-10-18 23:29 ` Balbir Singh
2017-10-19 16:55 ` Ram Pai
2017-09-08 22:45 ` [PATCH 22/25] powerpc: capture the violated protection key on fault Ram Pai
2017-10-24 15:46 ` Michael Ellerman
2017-09-08 22:45 ` [PATCH 23/25] powerpc: Deliver SEGV signal on pkey violation Ram Pai
2017-10-24 15:46 ` Michael Ellerman
2017-10-24 17:19 ` Ram Pai
2017-09-08 22:45 ` [PATCH 24/25] powerpc/ptrace: Add memory protection key regset Ram Pai
2017-09-08 22:45 ` [PATCH 25/25] powerpc: Enable pkey subsystem Ram Pai
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