[v2] kernel/memremap, kasan: Make ZONE_DEVICE with work with KASAN

Message ID	20180629164932.740-1-aryabinin@virtuozzo.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <owner-linux-mm@kvack.org> Received-SPF: pass (google.com: domain of aryabinin@virtuozzo.com designates 40.107.1.100 as permitted sender) client-ip=40.107.1.100; From: Andrey Ryabinin <aryabinin@virtuozzo.com> To: akpm@linux-foundation.org Cc: david@fromorbit.com, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, dan.j.williams@intel.com, dvyukov@google.com, glider@google.com, Andrey Ryabinin <aryabinin@virtuozzo.com> Subject: [PATCH v2] kernel/memremap, kasan: Make ZONE_DEVICE with work with KASAN Date: Fri, 29 Jun 2018 19:49:32 +0300 Message-Id: <20180629164932.740-1-aryabinin@virtuozzo.com> In-Reply-To: <20180625170259.30393-1-aryabinin@virtuozzo.com> References: <20180625170259.30393-1-aryabinin@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: None (protection.outlook.com: virtuozzo.com does not designate permitted sender hosts) X-Microsoft-Exchange-Diagnostics: =?us-ascii?Q?1; AM0PR08MB3249; 23:aPxCxYutc+2nuxKWUteJSdJI8gEglogIBctI0zHw1?= =?us-ascii?Q?r+TF4rxx5OG9n2t7GI3MjoIaS1H5hQ+jyplFPwduH07NkefcvF7HxkzzioxI?= =?us-ascii?Q?Vd5wWzT9mtquawOOzakDXO0Ui7Bea9VM540bgV2ZkLV6cBF+fMeYrfcJFi05?= =?us-ascii?Q?VP1WmSxlNZyqUL9OLdaUzttL+Oj7f1SD0H5LXEEr4blugBdd8QeSfo3hRkvB?= =?us-ascii?Q?2pcyNgwFrP2Z3WGgjqMTuAM4aiSG0a3jd+iV3EpP6eIwaEu2jkJnVkOTwTB/?= =?us-ascii?Q?1ng3/G8A+gjcRdoPUW/a/hyXB9Zqij9afTFT+XtUQm5LZJxVXQSQ3xprKmVh?= =?us-ascii?Q?L8eRignDl7YKmbKGCGDv/L37p8b1kGQ1Sd46XpX5eOCp33gQs9ui90GPftGf?= =?us-ascii?Q?5CApCkhPRQrmQaY9dL9KUWtNTDTTIEguXHKnr210yzUPWbdD3B/lVfM8YgP8?= =?us-ascii?Q?0sXV0CQAXIXo00WkG66KBgNOT2ThjXa17HH8M/U5WbO4+IIGqG7jOIADJRmK?= =?us-ascii?Q?PZYj9a1bQygWmWXQNwkEzESu8lrDbyeRAyb8Mj9SSc6j1jK716EUarEabwEl?= =?us-ascii?Q?6wAAHuia+X7ZkxonKJDmsJTzjWloB7EDnILsLOlw77Q1Jq+xyGotKhVdMHlq?= =?us-ascii?Q?ybLfHxT4rnvxuQzF9004upECNegiXXzj+HsYbSdaTx0EYhAsbOfmqmwPxGAO?= =?us-ascii?Q?QSXsGHKH4wKZjUPOFMmerfQm2YiNV9PgZcJMQ1uZkIVYxoM7Vcu2L0l+1SQ0?= =?us-ascii?Q?05JYhB9Ei0lsDf2ikyHxHDdhbq4rZlTLQB1L/nt+ou/y6z0QHh1dY7sY/eyH?= =?us-ascii?Q?o34K8yuGQ2ARo3Lu1/csOjw32yG5VURveYQms7XJlY+jyG3BN+3oyQ9iFL9n?= =?us-ascii?Q?nvfqck8zC1fur6UxBE4uQQ+WmRRf4r5YWzYjwygX1GlxKm9LSSSTSbHJYTAn?= =?us-ascii?Q?oHW5FDXXnjpBeyc3l5JrI2rLfkxC3NeSicEDAk4kQwHMgXaOYjQPhnzEfv7v?= =?us-ascii?Q?nzhn9VAEiST8U8Y/Gjt/KP2xdID3x0d+2WIamrjRFbO4Cv5OU6JMa5q3Hp7o?= =?us-ascii?Q?74f1x95cw+YtCuOulz/aIXwJj8nt5b65olgMI8T7AwgidugSjzf0PHqD6hdj?= =?us-ascii?Q?LJ9X8TsTXVen1EeNfhqD3PtRMAFb84oSEe69LciZUYafUADcgo+ZZRFPqt6j?= =?us-ascii?Q?RLXa0d0g+A1GKGjOQKVqRytwv1kbK2Y7AwOaTpb40vYNj4gT3lxGTez/oC5/?= =?us-ascii?Q?2ZapMdJZlEz3Osb4TwFPfHV3M3pJNWHY0B3LONYoUTZZkcTafnRQDJYKCbzf?= =?us-ascii?Q?9cuKEeQh37m+Vze4KzURLsvoud2NzNDEcsWEe0fVmU2?= X-Microsoft-Antispam-Message-Info: Y75nfb07FRODkMOHXNUZ2MhQoWUsDa8d4QvUcbK+WV0CfqgV8wItClPmaPOhu4+0RAoX6O5l1WyXMQCdZvqUcFCbA9vhkib79ZTjdyOS5UD+xaNQGpe2BjEeeVAXyVBr2smDgXEyBI7pa3izERXKfZkwH+oYln5qhPAyB36K+HwmmDtM7c32Olb3Zh/ZAfqAdCPuNF/h5rror26Xyc9CIuei/a+rM5aiVYTw20bujosQYV/sr2cl5WDClIPJ6KdS1mmU2aNA7vezaMpLUVnDk2umZvyMZaNH/c3dH3a3HQY5ZAICSKXeIxmr7lKkwBBiOMkF/H32CV4RszEIDLBsbsMvMzOFWNfAZG0fFYKIBxI= X-Microsoft-Exchange-Diagnostics: 1; AM0PR08MB3249; 6:nnz2OMpWrUbSwh1GHh+7ZLS16jwALEpucBQEaiWv8fCWcDWd/Xs3TAvrjQ6YZx7zMrSa5x24zj2IZJOZ4HSPN6ZNKNe/EXnRdpW9h8oXbQoeUSkaBkvVm8wLME2KpS22RxnLKdQI45jlGV+vu4Xo5BT5dh6rzYtTeCagzkf/1ptMhqLb6f7cIhQoIfav+EsqXcGkKmoYbWjlARAWuFf5cdZfFXVPbUnynxl0mJJrqzoGI64S/mLFlTIcWSQuI0c0v1aRPV1FbBfHa4P6/WNZ/7cIOJcfVQZUcS3gmoSjuzvfFUlUKZbFTEa3IbuK7LAQCpsF9w42qKFjoNiRKzDI+ocsys0guaJpAiNh7uD5OcFIQe3InCr2wpBRDtHZNg8n04RztOhq6J+d8e7slECvemR4GDNdCOZT8srWI7o2h9a0BQX9WVrnAwPU4+jhe4XDsUpIET85gR+7r0jA4MzBnA==; 5:bfwKg4WMZfRpDKdMWCKGWYFf0DmHyQKz8mfDawagnyPXGfj5CZRsGyea4hrv9LPOz3xT1ZTh7RaHe5vmuf4dQRGlPh5fXm32iDtBM5vpTLu9+QxPXGrQqM1/D4omtiiABOcgUiO3xRkhbZ7kbYCIUXX+lWoollnRdxHEkj6EbY0=; 24:Y/EeElZPg1DjIhmwpckjz9vJAbwrNFSOiNSarHQiTbQkDDhgRWaWH3ghI9nCC17O5KVmS5Cwn+YVQ1AmTN/u5xxgYh9t7cffCcLeX1qEv/8= SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-Microsoft-Exchange-Diagnostics: 1; AM0PR08MB3249; 7:707dX39QIA/i0AwulA8e6uVnwAeq0IlIN2R/FZQFLCihmByLDMUQP+LSjjT5YocewFcRX2QRqs5oz56Nxa89zzXf66XnZgsfA/+q2B8aSIYIkqfdGjwB0/jH/VVIwtgPwJhPBfNiGwtYcIqZjKXVLbbn+145hQMoo0hQLWi+uJhSy1lWBH5cRtVYQBZN1blUJW0zzqXcuE7+ssQlNlWZoiWRj8QkdSKRJPJGLIH7wc/oJZaMXa35s5StirFt7Pzz; 20:8I3DA0/EAJhJ215VV35/LXiU1YVxxwzGQTJgN/LqCmH0hc4GCJ26AwqR7eken9sN0B2xxQs4lrAyK3taxDsKeoARks4VxHveP9krIOuu2o6m1ebjyJ681LHOM3UJOFbU1yK45EyekmT/To1zllyopiR7NKeIEFDQwLbjbyTw/Jc= Sender: owner-linux-mm@kvack.org Precedence: bulk

diff --git a/include/linux/kasan.h b/include/linux/kasan.h index de784fd11d12..46aae129917c 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -20,7 +20,7 @@ extern pmd_t kasan_zero_pmd[PTRS_PER_PMD]; extern pud_t kasan_zero_pud[PTRS_PER_PUD]; extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D]; -void kasan_populate_zero_shadow(const void *shadow_start, +int kasan_populate_zero_shadow(const void *shadow_start, const void *shadow_end); static inline void *kasan_mem_to_shadow(const void *addr) @@ -71,6 +71,9 @@ struct kasan_cache { int kasan_module_alloc(void *addr, size_t size); void kasan_free_shadow(const struct vm_struct *vm); +int kasan_add_zero_shadow(void *start, unsigned long size); +void kasan_remove_zero_shadow(void *start, unsigned long size); + size_t ksize(const void *); static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); } size_t kasan_metadata_size(struct kmem_cache *cache); @@ -124,6 +127,14 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object, static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } static inline void kasan_free_shadow(const struct vm_struct *vm) {} +static inline int kasan_add_zero_shadow(void *start, unsigned long size) +{ + return 0; +} +static inline void kasan_remove_zero_shadow(void *start, + unsigned long size) +{} + static inline void kasan_unpoison_slab(const void *ptr) { } static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } diff --git a/kernel/memremap.c b/kernel/memremap.c index 5857267a4af5..172264bf5812 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -5,6 +5,7 @@ #include <linux/types.h> #include <linux/pfn_t.h> #include <linux/io.h> +#include <linux/kasan.h> #include <linux/mm.h> #include <linux/memory_hotplug.h> #include <linux/swap.h> @@ -137,6 +138,7 @@ static void devm_memremap_pages_release(void *data) mem_hotplug_begin(); arch_remove_memory(align_start, align_size, pgmap->altmap_valid ? &pgmap->altmap : NULL); + kasan_remove_zero_shadow(__va(align_start), align_size); mem_hotplug_done(); untrack_pfn(NULL, PHYS_PFN(align_start), align_size); @@ -223,6 +225,12 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) goto err_pfn_remap; mem_hotplug_begin(); + error = kasan_add_zero_shadow(__va(align_start), align_size); + if (error) { + mem_hotplug_done(); + goto err_kasan; + } + error = arch_add_memory(nid, align_start, align_size, altmap, false); if (!error) move_pfn_range_to_zone(&NODE_DATA(nid)->node_zones[ZONE_DEVICE], @@ -251,6 +259,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) return __va(res->start); err_add_memory: + kasan_remove_zero_shadow(__va(align_start), align_size); + err_kasan: untrack_pfn(NULL, PHYS_PFN(align_start), align_size); err_pfn_remap: err_radix: diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c index f436246ccc79..7a2a2f13f86f 100644 --- a/mm/kasan/kasan_init.c +++ b/mm/kasan/kasan_init.c @@ -17,10 +17,13 @@ #include <linux/memblock.h> #include <linux/mm.h> #include <linux/pfn.h> +#include <linux/slab.h> #include <asm/page.h> #include <asm/pgalloc.h> +#include "kasan.h" + /* * This page serves two purposes: * - It used as early shadow memory. The entire shadow region populated @@ -32,22 +35,59 @@ unsigned char kasan_zero_page[PAGE_SIZE] __page_aligned_bss; #if CONFIG_PGTABLE_LEVELS > 4 p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D] __page_aligned_bss; +static inline bool kasan_p4d_table(pgd_t pgd) +{ + return pgd_page(pgd) == virt_to_page(lm_alias(kasan_zero_p4d)); +} +#else +static inline bool kasan_p4d_table(pgd_t pgd) +{ + return 0; +} #endif #if CONFIG_PGTABLE_LEVELS > 3 pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss; +static inline bool kasan_pud_table(p4d_t p4d) +{ + return p4d_page(p4d) == virt_to_page(lm_alias(kasan_zero_pud)); +} +#else +static inline bool kasan_pud_table(p4d_t p4d) +{ + return 0; +} #endif #if CONFIG_PGTABLE_LEVELS > 2 pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss; +static inline bool kasan_pmd_table(pud_t pud) +{ + return pud_page(pud) == virt_to_page(lm_alias(kasan_zero_pmd)); +} +#else +static inline bool kasan_pmd_table(pud_t pud) +{ + return 0; +} #endif pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss; +static inline bool kasan_pte_table(pmd_t pmd) +{ + return pmd_page(pmd) == virt_to_page(lm_alias(kasan_zero_pte)); +} + +static inline bool kasan_zero_page_entry(pte_t pte) +{ + return pte_page(pte) == virt_to_page(lm_alias(kasan_zero_page)); +} + static __init void *early_alloc(size_t size, int node) { return memblock_virt_alloc_try_nid(size, size, __pa(MAX_DMA_ADDRESS), BOOTMEM_ALLOC_ACCESSIBLE, node); } -static void __init zero_pte_populate(pmd_t *pmd, unsigned long addr, +static void __ref zero_pte_populate(pmd_t *pmd, unsigned long addr, unsigned long end) { pte_t *pte = pte_offset_kernel(pmd, addr); @@ -63,7 +103,7 @@ static void __init zero_pte_populate(pmd_t *pmd, unsigned long addr, } } -static void __init zero_pmd_populate(pud_t *pud, unsigned long addr, +static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr, unsigned long end) { pmd_t *pmd = pmd_offset(pud, addr); @@ -78,14 +118,24 @@ static void __init zero_pmd_populate(pud_t *pud, unsigned long addr, } if (pmd_none(*pmd)) { - pmd_populate_kernel(&init_mm, pmd, - early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + pte_t *p; + + if (slab_is_available()) + p = pte_alloc_one_kernel(&init_mm, addr); + else + p = early_alloc(PAGE_SIZE, NUMA_NO_NODE); + if (!p) + return -ENOMEM; + + pmd_populate_kernel(&init_mm, pmd, p); } zero_pte_populate(pmd, addr, next); } while (pmd++, addr = next, addr != end); + + return 0; } -static void __init zero_pud_populate(p4d_t *p4d, unsigned long addr, +static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr, unsigned long end) { pud_t *pud = pud_offset(p4d, addr); @@ -103,14 +153,24 @@ static void __init zero_pud_populate(p4d_t *p4d, unsigned long addr, } if (pud_none(*pud)) { - pud_populate(&init_mm, pud, - early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + pmd_t *p; + + if (slab_is_available()) { + p = pmd_alloc(&init_mm, pud, addr); + if (!p) + return -ENOMEM; + } else { + pud_populate(&init_mm, pud, + early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + } } zero_pmd_populate(pud, addr, next); } while (pud++, addr = next, addr != end); + + return 0; } -static void __init zero_p4d_populate(pgd_t *pgd, unsigned long addr, +static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr, unsigned long end) { p4d_t *p4d = p4d_offset(pgd, addr); @@ -132,11 +192,21 @@ static void __init zero_p4d_populate(pgd_t *pgd, unsigned long addr, } if (p4d_none(*p4d)) { - p4d_populate(&init_mm, p4d, - early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + pud_t *p; + + if (slab_is_available()) { + p = pud_alloc(&init_mm, p4d, addr); + if (!p) + return -ENOMEM; + } else { + p4d_populate(&init_mm, p4d, + early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + } } zero_pud_populate(p4d, addr, next); } while (p4d++, addr = next, addr != end); + + return 0; } /** @@ -145,7 +215,7 @@ static void __init zero_p4d_populate(pgd_t *pgd, unsigned long addr, * @shadow_start - start of the memory range to populate * @shadow_end - end of the memory range to populate */ -void __init kasan_populate_zero_shadow(const void *shadow_start, +int __ref kasan_populate_zero_shadow(const void *shadow_start, const void *shadow_end) { unsigned long addr = (unsigned long)shadow_start; @@ -191,9 +261,229 @@ void __init kasan_populate_zero_shadow(const void *shadow_start, } if (pgd_none(*pgd)) { - pgd_populate(&init_mm, pgd, - early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + p4d_t *p; + + if (slab_is_available()) { + p = p4d_alloc(&init_mm, pgd, addr); + if (!p) + return -ENOMEM; + } else { + pgd_populate(&init_mm, pgd, + early_alloc(PAGE_SIZE, NUMA_NO_NODE)); + } } zero_p4d_populate(pgd, addr, next); } while (pgd++, addr = next, addr != end); + + return 0; +} + +static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd) +{ + pte_t *pte; + int i; + + for (i = 0; i < PTRS_PER_PTE; i++) { + pte = pte_start + i; + if (!pte_none(*pte)) + return; + } + + pte_free_kernel(&init_mm, (pte_t *)page_to_virt(pmd_page(*pmd))); + pmd_clear(pmd); +} + +static void kasan_free_pmd(pmd_t *pmd_start, pud_t *pud) +{ + pmd_t *pmd; + int i; + + for (i = 0; i < PTRS_PER_PMD; i++) { + pmd = pmd_start + i; + if (!pmd_none(*pmd)) + return; + } + + pmd_free(&init_mm, (pmd_t *)page_to_virt(pud_page(*pud))); + pud_clear(pud); +} + +static void kasan_free_pud(pud_t *pud_start, p4d_t *p4d) +{ + pud_t *pud; + int i; + + for (i = 0; i < PTRS_PER_PUD; i++) { + pud = pud_start + i; + if (!pud_none(*pud)) + return; + } + + pud_free(&init_mm, (pud_t *)page_to_virt(p4d_page(*p4d))); + p4d_clear(p4d); +} + +static void kasan_free_p4d(p4d_t *p4d_start, pgd_t *pgd) +{ + p4d_t *p4d; + int i; + + for (i = 0; i < PTRS_PER_P4D; i++) { + p4d = p4d_start + i; + if (!p4d_none(*p4d)) + return; + } + + p4d_free(&init_mm, (p4d_t *)page_to_virt(pgd_page(*pgd))); + pgd_clear(pgd); +} + +static void kasan_remove_pte_table(pte_t *pte, unsigned long addr, + unsigned long end) +{ + unsigned long next; + + for (; addr < end; addr = next, pte++) { + next = (addr + PAGE_SIZE) & PAGE_MASK; + if (next > end) + next = end; + + if (!pte_present(*pte)) + continue; + + if (WARN_ON(!kasan_zero_page_entry(*pte))) + continue; + pte_clear(&init_mm, addr, pte); + } +} + +static void kasan_remove_pmd_table(pmd_t *pmd, unsigned long addr, + unsigned long end) +{ + unsigned long next; + + for (; addr < end; addr = next, pmd++) { + pte_t *pte; + + next = pmd_addr_end(addr, end); + + if (!pmd_present(*pmd)) + continue; + + if (kasan_pte_table(*pmd)) { + if (IS_ALIGNED(addr, PMD_SIZE) && + IS_ALIGNED(next, PMD_SIZE)) + pmd_clear(pmd); + continue; + } + pte = pte_offset_kernel(pmd, addr); + kasan_remove_pte_table(pte, addr, next); + kasan_free_pte(pte_offset_kernel(pmd, 0), pmd); + } +} + +static void kasan_remove_pud_table(pud_t *pud, unsigned long addr, + unsigned long end) +{ + unsigned long next; + + for (; addr < end; addr = next, pud++) { + pmd_t *pmd, *pmd_base; + + next = pud_addr_end(addr, end); + + if (!pud_present(*pud)) + continue; + + if (kasan_pmd_table(*pud)) { + if (IS_ALIGNED(addr, PUD_SIZE) && + IS_ALIGNED(next, PUD_SIZE)) + pud_clear(pud); + continue; + } + pmd = pmd_offset(pud, addr); + pmd_base = pmd_offset(pud, 0); + kasan_remove_pmd_table(pmd, addr, next); + kasan_free_pmd(pmd_base, pud); + } +} + +static void kasan_remove_p4d_table(p4d_t *p4d, unsigned long addr, + unsigned long end) +{ + unsigned long next; + + for (; addr < end; addr = next, p4d++) { + pud_t *pud; + + next = p4d_addr_end(addr, end); + + if (!p4d_present(*p4d)) + continue; + + if (kasan_pud_table(*p4d)) { + if (IS_ALIGNED(addr, P4D_SIZE) && + IS_ALIGNED(next, P4D_SIZE)) + p4d_clear(p4d); + continue; + } + pud = pud_offset(p4d, addr); + kasan_remove_pud_table(pud, addr, next); + kasan_free_pud(pud_offset(p4d, 0), p4d); + } +} + +void kasan_remove_zero_shadow(void *start, unsigned long size) +{ + unsigned long addr, end, next; + pgd_t *pgd; + + addr = (unsigned long)kasan_mem_to_shadow(start); + end = addr + (size >> KASAN_SHADOW_SCALE_SHIFT); + + if (WARN_ON((unsigned long)start % + (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)) || + WARN_ON(size % (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE))) + return; + + for (; addr < end; addr = next) { + p4d_t *p4d; + + next = pgd_addr_end(addr, end); + + pgd = pgd_offset_k(addr); + if (!pgd_present(*pgd)) + continue; + + if (kasan_p4d_table(*pgd)) { + if (IS_ALIGNED(addr, PGDIR_SIZE) && + IS_ALIGNED(next, PGDIR_SIZE)) + pgd_clear(pgd); + continue; + } + + p4d = p4d_offset(pgd, addr); + kasan_remove_p4d_table(p4d, addr, next); + kasan_free_p4d(p4d_offset(pgd, 0), pgd); + } +} + +int kasan_add_zero_shadow(void *start, unsigned long size) +{ + int ret; + void *shadow_start, *shadow_end; + + shadow_start = kasan_mem_to_shadow(start); + shadow_end = shadow_start + (size >> KASAN_SHADOW_SCALE_SHIFT); + + if (WARN_ON((unsigned long)start % + (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)) || + WARN_ON(size % (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE))) + return -EINVAL; + + ret = kasan_populate_zero_shadow(shadow_start, shadow_end); + if (ret) + kasan_remove_zero_shadow(shadow_start, + size >> KASAN_SHADOW_SCALE_SHIFT); + return ret; }

[v2] kernel/memremap, kasan: Make ZONE_DEVICE with work with KASAN

Commit Message

Comments

Patch