diff options
Diffstat (limited to 'arch/powerpc/mm/init-common.c')
| -rw-r--r-- | arch/powerpc/mm/init-common.c | 124 |
1 files changed, 93 insertions, 31 deletions
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c index eb8c6c8c4851..745097554bea 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) @@ -11,36 +12,100 @@ * * 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. - * */ #undef DEBUG #include <linux/string.h> +#include <linux/pgtable.h> #include <asm/pgalloc.h> -#include <asm/pgtable.h> +#include <asm/kup.h> +#include <asm/smp.h> + +phys_addr_t memstart_addr __ro_after_init = (phys_addr_t)~0ull; +EXPORT_SYMBOL_GPL(memstart_addr); +phys_addr_t kernstart_addr __ro_after_init; +EXPORT_SYMBOL_GPL(kernstart_addr); +unsigned long kernstart_virt_addr __ro_after_init = KERNELBASE; +EXPORT_SYMBOL_GPL(kernstart_virt_addr); + +bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP); +bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP); +#ifdef CONFIG_KFENCE +bool __ro_after_init kfence_disabled; +bool __ro_after_init kfence_early_init = !!CONFIG_KFENCE_SAMPLE_INTERVAL; +#endif + +static int __init parse_nosmep(char *p) +{ + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64)) + return 0; + + disable_kuep = true; + pr_warn("Disabling Kernel Userspace Execution Prevention\n"); + return 0; +} +early_param("nosmep", parse_nosmep); + +static int __init parse_nosmap(char *p) +{ + disable_kuap = true; + pr_warn("Disabling Kernel Userspace Access Protection\n"); + return 0; +} +early_param("nosmap", parse_nosmap); -static void pgd_ctor(void *addr) +void __weak setup_kuep(bool disabled) { - memset(addr, 0, PGD_TABLE_SIZE); + if (!IS_ENABLED(CONFIG_PPC_KUEP) || disabled) + return; + + if (smp_processor_id() != boot_cpuid) + return; + + pr_info("Activating Kernel Userspace Execution Prevention\n"); } -static void pud_ctor(void *addr) +void setup_kup(void) { - memset(addr, 0, PUD_TABLE_SIZE); + setup_kuap(disable_kuap); + setup_kuep(disable_kuep); } -static void pmd_ctor(void *addr) +#define CTOR(shift) static void ctor_##shift(void *addr) \ +{ \ + memset(addr, 0, sizeof(pgd_t) << (shift)); \ +} + +CTOR(0); CTOR(1); CTOR(2); CTOR(3); CTOR(4); CTOR(5); CTOR(6); CTOR(7); +CTOR(8); CTOR(9); CTOR(10); CTOR(11); CTOR(12); CTOR(13); CTOR(14); CTOR(15); + +static inline void (*ctor(int shift))(void *) { - memset(addr, 0, PMD_TABLE_SIZE); + BUILD_BUG_ON(MAX_PGTABLE_INDEX_SIZE != 15); + + switch (shift) { + case 0: return ctor_0; + case 1: return ctor_1; + case 2: return ctor_2; + case 3: return ctor_3; + case 4: return ctor_4; + case 5: return ctor_5; + case 6: return ctor_6; + case 7: return ctor_7; + case 8: return ctor_8; + case 9: return ctor_9; + case 10: return ctor_10; + case 11: return ctor_11; + case 12: return ctor_12; + case 13: return ctor_13; + case 14: return ctor_14; + case 15: return ctor_15; + } + return NULL; } -struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE]; +struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE + 1]; EXPORT_SYMBOL_GPL(pgtable_cache); /* used by kvm_hv module */ /* @@ -50,40 +115,37 @@ EXPORT_SYMBOL_GPL(pgtable_cache); /* used by kvm_hv module */ * everything else. Caches created by this function are used for all * the higher level pagetables, and for hugepage pagetables. */ -void pgtable_cache_add(unsigned shift, void (*ctor)(void *)) +void pgtable_cache_add(unsigned int shift) { char *name; - unsigned long table_size = sizeof(void *) << shift; + unsigned long table_size = sizeof(pgd_t) << shift; unsigned long align = table_size; /* When batching pgtable pointers for RCU freeing, we store * the index size in the low bits. Table alignment must be * big enough to fit it. - * - * Likewise, hugeapge pagetable pointers contain a (different) - * shift value in the low bits. All tables must be aligned so - * as to leave enough 0 bits in the address to contain it. */ - unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1, - HUGEPD_SHIFT_MASK + 1); - struct kmem_cache *new; + */ + unsigned long minalign = MAX_PGTABLE_INDEX_SIZE + 1; + struct kmem_cache *new = NULL; /* It would be nice if this was a BUILD_BUG_ON(), but at the * moment, gcc doesn't seem to recognize is_power_of_2 as a * constant expression, so so much for that. */ BUG_ON(!is_power_of_2(minalign)); - BUG_ON((shift < 1) || (shift > MAX_PGTABLE_INDEX_SIZE)); + BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); if (PGT_CACHE(shift)) return; /* Already have a cache of this size */ align = max_t(unsigned long, align, minalign); name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); - new = kmem_cache_create(name, table_size, align, 0, ctor); + if (name) + new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); if (!new) panic("Could not allocate pgtable cache for order %d", shift); kfree(name); - pgtable_cache[shift - 1] = new; + pgtable_cache[shift] = new; pr_debug("Allocated pgtable cache for order %d\n", shift); } @@ -91,15 +153,15 @@ EXPORT_SYMBOL_GPL(pgtable_cache_add); /* used by kvm_hv module */ void pgtable_cache_init(void) { - pgtable_cache_add(PGD_INDEX_SIZE, pgd_ctor); + pgtable_cache_add(PGD_INDEX_SIZE); - if (PMD_CACHE_INDEX && !PGT_CACHE(PMD_CACHE_INDEX)) - pgtable_cache_add(PMD_CACHE_INDEX, pmd_ctor); + if (PMD_CACHE_INDEX) + pgtable_cache_add(PMD_CACHE_INDEX); /* * In all current configs, when the PUD index exists it's the * same size as either the pgd or pmd index except with THP enabled * on book3s 64 */ - if (PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE)) - pgtable_cache_add(PUD_INDEX_SIZE, pud_ctor); + if (PUD_CACHE_INDEX) + pgtable_cache_add(PUD_CACHE_INDEX); } |