diff options
Diffstat (limited to 'arch/powerpc/mm/book3s64')
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_native.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_pgtable.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_tlb.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_utils.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/iommu_api.c | 7 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/mmu_context.c | 62 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/pgtable.c | 9 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/radix_pgtable.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/radix_tlb.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/slb.c | 7 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s64/subpage_prot.c | 6 |
11 files changed, 61 insertions, 66 deletions
diff --git a/arch/powerpc/mm/book3s64/hash_native.c b/arch/powerpc/mm/book3s64/hash_native.c index aaa28fd918fe..30d62ffe3310 100644 --- a/arch/powerpc/mm/book3s64/hash_native.c +++ b/arch/powerpc/mm/book3s64/hash_native.c @@ -1,13 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * native hashtable management. * * SMP scalability work: * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #undef DEBUG_LOW diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c index 1fd025dba4a3..d1f390ac9cdb 100644 --- a/arch/powerpc/mm/book3s64/hash_pgtable.c +++ b/arch/powerpc/mm/book3s64/hash_pgtable.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2005, Paul Mackerras, IBM Corporation. * Copyright 2009, Benjamin Herrenschmidt, IBM Corporation. * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <linux/sched.h> diff --git a/arch/powerpc/mm/book3s64/hash_tlb.c b/arch/powerpc/mm/book3s64/hash_tlb.c index d4f0101447b1..4a70d8dd39cd 100644 --- a/arch/powerpc/mm/book3s64/hash_tlb.c +++ b/arch/powerpc/mm/book3s64/hash_tlb.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * This file contains the routines for flushing entries from the * TLB and MMU hash table. @@ -14,11 +15,6 @@ * * Dave Engebretsen <engebret@us.ibm.com> * Rework for PPC64 port. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <linux/kernel.h> diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index 919a861a8ec0..28ced26f2a00 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * PowerPC64 port by Mike Corrigan and Dave Engebretsen * {mikejc|engebret}@us.ibm.com @@ -11,11 +12,6 @@ * * Description: * PowerPC Hashed Page Table functions - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #undef DEBUG diff --git a/arch/powerpc/mm/book3s64/iommu_api.c b/arch/powerpc/mm/book3s64/iommu_api.c index 5c521f3924a5..90ee3a89722c 100644 --- a/arch/powerpc/mm/book3s64/iommu_api.c +++ b/arch/powerpc/mm/book3s64/iommu_api.c @@ -1,13 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * IOMMU helpers in MMU context. * * Copyright (C) 2015 IBM Corp. <aik@ozlabs.ru> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * */ #include <linux/sched/signal.h> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c index cb2b08635508..794404d50a85 100644 --- a/arch/powerpc/mm/book3s64/mmu_context.c +++ b/arch/powerpc/mm/book3s64/mmu_context.c @@ -1,13 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * MMU context allocation for 64-bit kernels. * * Copyright (C) 2004 Anton Blanchard, IBM Corp. <anton@samba.org> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * */ #include <linux/sched.h> @@ -55,20 +50,52 @@ EXPORT_SYMBOL_GPL(hash__alloc_context_id); void slb_setup_new_exec(void); +static int realloc_context_ids(mm_context_t *ctx) +{ + int i, id; + + /* + * id 0 (aka. ctx->id) is special, we always allocate a new one, even if + * there wasn't one allocated previously (which happens in the exec + * case where ctx is newly allocated). + * + * We have to be a bit careful here. We must keep the existing ids in + * the array, so that we can test if they're non-zero to decide if we + * need to allocate a new one. However in case of error we must free the + * ids we've allocated but *not* any of the existing ones (or risk a + * UAF). That's why we decrement i at the start of the error handling + * loop, to skip the id that we just tested but couldn't reallocate. + */ + for (i = 0; i < ARRAY_SIZE(ctx->extended_id); i++) { + if (i == 0 || ctx->extended_id[i]) { + id = hash__alloc_context_id(); + if (id < 0) + goto error; + + ctx->extended_id[i] = id; + } + } + + /* The caller expects us to return id */ + return ctx->id; + +error: + for (i--; i >= 0; i--) { + if (ctx->extended_id[i]) + ida_free(&mmu_context_ida, ctx->extended_id[i]); + } + + return id; +} + static int hash__init_new_context(struct mm_struct *mm) { int index; - index = hash__alloc_context_id(); - if (index < 0) - return index; - mm->context.hash_context = kmalloc(sizeof(struct hash_mm_context), GFP_KERNEL); - if (!mm->context.hash_context) { - ida_free(&mmu_context_ida, index); + if (!mm->context.hash_context) return -ENOMEM; - } /* * The old code would re-promote on fork, we don't do that when using @@ -96,13 +123,20 @@ static int hash__init_new_context(struct mm_struct *mm) mm->context.hash_context->spt = kmalloc(sizeof(struct subpage_prot_table), GFP_KERNEL); if (!mm->context.hash_context->spt) { - ida_free(&mmu_context_ida, index); kfree(mm->context.hash_context); return -ENOMEM; } } #endif + } + index = realloc_context_ids(&mm->context); + if (index < 0) { +#ifdef CONFIG_PPC_SUBPAGE_PROT + kfree(mm->context.hash_context->spt); +#endif + kfree(mm->context.hash_context); + return index; } pkey_mm_init(mm); diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 16bda049187a..01bc9663360d 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -1,10 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <linux/sched.h> @@ -116,6 +112,9 @@ pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, /* * This ensures that generic code that rely on IRQ disabling * to prevent a parallel THP split work as expected. + * + * Marking the entry with _PAGE_INVALID && ~_PAGE_PRESENT requires + * a special case check in pmd_access_permitted. */ serialize_against_pte_lookup(vma->vm_mm); return __pmd(old_pmd); diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c index c9bcf428dd2b..273ae66a9a45 100644 --- a/arch/powerpc/mm/book3s64/radix_pgtable.c +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Page table handling routines for radix page table. * * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #define pr_fmt(fmt) "radix-mmu: " fmt diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c index 4d841369399f..bb9835681315 100644 --- a/arch/powerpc/mm/book3s64/radix_tlb.c +++ b/arch/powerpc/mm/book3s64/radix_tlb.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * TLB flush routines for radix kernels. * * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <linux/mm.h> diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c index c22742218bd3..716204aee3da 100644 --- a/arch/powerpc/mm/book3s64/slb.c +++ b/arch/powerpc/mm/book3s64/slb.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * PowerPC64 SLB support. * @@ -6,12 +7,6 @@ * Dave Engebretsen and Mike Corrigan {engebret|mikejc}@us.ibm.com * Copyright (c) 2001 Dave Engebretsen * Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM - * - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <asm/asm-prototypes.h> diff --git a/arch/powerpc/mm/book3s64/subpage_prot.c b/arch/powerpc/mm/book3s64/subpage_prot.c index 473dd430e306..9ba07e55c489 100644 --- a/arch/powerpc/mm/book3s64/subpage_prot.c +++ b/arch/powerpc/mm/book3s64/subpage_prot.c @@ -1,10 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2007-2008 Paul Mackerras, IBM Corp. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. */ #include <linux/errno.h> |