From: andrey.konovalov@linux.dev To: Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Peter Collingbourne <pcc@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev@googlegroups.com, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, Evgenii Stepanov <eugenis@google.com>, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH v2 01/34] kasan, page_alloc: deduplicate should_skip_kasan_poison Date: Mon, 6 Dec 2021 22:22:05 +0100 [thread overview] Message-ID: <9644e588df352734bb5c166caac2d440052cd04f.1638825394.git.andreyknvl@google.com> (raw) In-Reply-To: <cover.1638825394.git.andreyknvl@google.com> From: Andrey Konovalov <andreyknvl@google.com> Currently, should_skip_kasan_poison() has two definitions: one for when CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, one for when it's not. Instead of duplicating the checks, add a deferred_pages_enabled() helper and use it in a single should_skip_kasan_poison() definition. Also move should_skip_kasan_poison() closer to its caller and clarify all conditions in the comment. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- mm/page_alloc.c | 55 +++++++++++++++++++++++++++++-------------------- 1 file changed, 33 insertions(+), 22 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c5952749ad40..c99566a3b67e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -375,25 +375,9 @@ int page_group_by_mobility_disabled __read_mostly; */ static DEFINE_STATIC_KEY_TRUE(deferred_pages); -/* - * Calling kasan_poison_pages() only after deferred memory initialization - * has completed. Poisoning pages during deferred memory init will greatly - * lengthen the process and cause problem in large memory systems as the - * deferred pages initialization is done with interrupt disabled. - * - * Assuming that there will be no reference to those newly initialized - * pages before they are ever allocated, this should have no effect on - * KASAN memory tracking as the poison will be properly inserted at page - * allocation time. The only corner case is when pages are allocated by - * on-demand allocation and then freed again before the deferred pages - * initialization is done, but this is not likely to happen. - */ -static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags) +static inline bool deferred_pages_enabled(void) { - return static_branch_unlikely(&deferred_pages) || - (!IS_ENABLED(CONFIG_KASAN_GENERIC) && - (fpi_flags & FPI_SKIP_KASAN_POISON)) || - PageSkipKASanPoison(page); + return static_branch_unlikely(&deferred_pages); } /* Returns true if the struct page for the pfn is uninitialised */ @@ -444,11 +428,9 @@ defer_init(int nid, unsigned long pfn, unsigned long end_pfn) return false; } #else -static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags) +static inline bool deferred_pages_enabled(void) { - return (!IS_ENABLED(CONFIG_KASAN_GENERIC) && - (fpi_flags & FPI_SKIP_KASAN_POISON)) || - PageSkipKASanPoison(page); + return false; } static inline bool early_page_uninitialised(unsigned long pfn) @@ -1258,6 +1240,35 @@ static int free_tail_pages_check(struct page *head_page, struct page *page) return ret; } +/* + * Skip KASAN memory poisoning when either: + * + * 1. Deferred memory initialization has not yet completed, + * see the explanation below. + * 2. Skipping poisoning is requested via FPI_SKIP_KASAN_POISON, + * see the comment next to it. + * 3. Skipping poisoning is requested via __GFP_SKIP_KASAN_POISON, + * see the comment next to it. + * + * Poisoning pages during deferred memory init will greatly lengthen the + * process and cause problem in large memory systems as the deferred pages + * initialization is done with interrupt disabled. + * + * Assuming that there will be no reference to those newly initialized + * pages before they are ever allocated, this should have no effect on + * KASAN memory tracking as the poison will be properly inserted at page + * allocation time. The only corner case is when pages are allocated by + * on-demand allocation and then freed again before the deferred pages + * initialization is done, but this is not likely to happen. + */ +static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags) +{ + return deferred_pages_enabled() || + (!IS_ENABLED(CONFIG_KASAN_GENERIC) && + (fpi_flags & FPI_SKIP_KASAN_POISON)) || + PageSkipKASanPoison(page); +} + static void kernel_init_free_pages(struct page *page, int numpages, bool zero_tags) { int i; -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: andrey.konovalov@linux.dev To: Marco Elver <elver@google.com>, Alexander Potapenko <glider@google.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Peter Collingbourne <pcc@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev@googlegroups.com, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, linux-arm-kernel@lists.infradead.org, Evgenii Stepanov <eugenis@google.com>, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH v2 01/34] kasan, page_alloc: deduplicate should_skip_kasan_poison Date: Mon, 6 Dec 2021 22:22:05 +0100 [thread overview] Message-ID: <9644e588df352734bb5c166caac2d440052cd04f.1638825394.git.andreyknvl@google.com> (raw) In-Reply-To: <cover.1638825394.git.andreyknvl@google.com> From: Andrey Konovalov <andreyknvl@google.com> Currently, should_skip_kasan_poison() has two definitions: one for when CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, one for when it's not. Instead of duplicating the checks, add a deferred_pages_enabled() helper and use it in a single should_skip_kasan_poison() definition. Also move should_skip_kasan_poison() closer to its caller and clarify all conditions in the comment. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- mm/page_alloc.c | 55 +++++++++++++++++++++++++++++-------------------- 1 file changed, 33 insertions(+), 22 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c5952749ad40..c99566a3b67e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -375,25 +375,9 @@ int page_group_by_mobility_disabled __read_mostly; */ static DEFINE_STATIC_KEY_TRUE(deferred_pages); -/* - * Calling kasan_poison_pages() only after deferred memory initialization - * has completed. Poisoning pages during deferred memory init will greatly - * lengthen the process and cause problem in large memory systems as the - * deferred pages initialization is done with interrupt disabled. - * - * Assuming that there will be no reference to those newly initialized - * pages before they are ever allocated, this should have no effect on - * KASAN memory tracking as the poison will be properly inserted at page - * allocation time. The only corner case is when pages are allocated by - * on-demand allocation and then freed again before the deferred pages - * initialization is done, but this is not likely to happen. - */ -static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags) +static inline bool deferred_pages_enabled(void) { - return static_branch_unlikely(&deferred_pages) || - (!IS_ENABLED(CONFIG_KASAN_GENERIC) && - (fpi_flags & FPI_SKIP_KASAN_POISON)) || - PageSkipKASanPoison(page); + return static_branch_unlikely(&deferred_pages); } /* Returns true if the struct page for the pfn is uninitialised */ @@ -444,11 +428,9 @@ defer_init(int nid, unsigned long pfn, unsigned long end_pfn) return false; } #else -static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags) +static inline bool deferred_pages_enabled(void) { - return (!IS_ENABLED(CONFIG_KASAN_GENERIC) && - (fpi_flags & FPI_SKIP_KASAN_POISON)) || - PageSkipKASanPoison(page); + return false; } static inline bool early_page_uninitialised(unsigned long pfn) @@ -1258,6 +1240,35 @@ static int free_tail_pages_check(struct page *head_page, struct page *page) return ret; } +/* + * Skip KASAN memory poisoning when either: + * + * 1. Deferred memory initialization has not yet completed, + * see the explanation below. + * 2. Skipping poisoning is requested via FPI_SKIP_KASAN_POISON, + * see the comment next to it. + * 3. Skipping poisoning is requested via __GFP_SKIP_KASAN_POISON, + * see the comment next to it. + * + * Poisoning pages during deferred memory init will greatly lengthen the + * process and cause problem in large memory systems as the deferred pages + * initialization is done with interrupt disabled. + * + * Assuming that there will be no reference to those newly initialized + * pages before they are ever allocated, this should have no effect on + * KASAN memory tracking as the poison will be properly inserted at page + * allocation time. The only corner case is when pages are allocated by + * on-demand allocation and then freed again before the deferred pages + * initialization is done, but this is not likely to happen. + */ +static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags) +{ + return deferred_pages_enabled() || + (!IS_ENABLED(CONFIG_KASAN_GENERIC) && + (fpi_flags & FPI_SKIP_KASAN_POISON)) || + PageSkipKASanPoison(page); +} + static void kernel_init_free_pages(struct page *page, int numpages, bool zero_tags) { int i; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-12-06 21:23 UTC|newest] Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-06 21:22 [PATCH v2 00/34] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS andrey.konovalov 2021-12-06 21:22 ` andrey.konovalov 2021-12-06 21:22 ` andrey.konovalov [this message] 2021-12-06 21:22 ` [PATCH v2 01/34] kasan, page_alloc: deduplicate should_skip_kasan_poison andrey.konovalov 2021-12-06 21:31 ` [PATCH v2 02/34] kasan, page_alloc: move tag_clear_highpage out of kernel_init_free_pages andrey.konovalov 2021-12-06 21:31 ` andrey.konovalov 2021-12-06 21:31 ` [PATCH v2 03/34] kasan, page_alloc: merge kasan_free_pages into free_pages_prepare andrey.konovalov 2021-12-06 21:31 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 04/34] kasan, page_alloc: simplify kasan_poison_pages call site andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 05/34] kasan, page_alloc: init memory of skipped pages on free andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 06/34] kasan: drop skip_kasan_poison variable in free_pages_prepare andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 07/34] mm: clarify __GFP_ZEROTAGS comment andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-07 17:33 ` Andrey Konovalov 2021-12-07 17:33 ` Andrey Konovalov 2021-12-06 21:43 ` [PATCH v2 08/34] kasan: only apply __GFP_ZEROTAGS when memory is zeroed andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-10 17:48 ` Catalin Marinas 2021-12-10 17:48 ` Catalin Marinas 2021-12-13 21:57 ` Andrey Konovalov 2021-12-13 21:57 ` Andrey Konovalov 2021-12-06 21:43 ` [PATCH v2 09/34] kasan, page_alloc: refactor init checks in post_alloc_hook andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 10/34] kasan, page_alloc: merge kasan_alloc_pages into post_alloc_hook andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 11/34] kasan, page_alloc: combine tag_clear_highpage calls in post_alloc_hook andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 12/34] kasan, page_alloc: move SetPageSkipKASanPoison " andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 13/34] kasan, page_alloc: move kernel_init_free_pages " andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 14/34] kasan, page_alloc: simplify kasan_unpoison_pages call site andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 15/34] kasan: clean up metadata byte definitions andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 16/34] kasan: define KASAN_VMALLOC_INVALID for SW_TAGS andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 17/34] kasan, x86, arm64, s390: rename functions for modules shadow andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-10 17:55 ` Catalin Marinas 2021-12-10 17:55 ` Catalin Marinas 2021-12-06 21:43 ` [PATCH v2 18/34] kasan, vmalloc: drop outdated VM_KASAN comment andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 19/34] kasan: reorder vmalloc hooks andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 20/34] kasan: add wrappers for " andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 21/34] kasan, vmalloc: reset tags in vmalloc functions andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:43 ` [PATCH v2 22/34] kasan, fork: don't tag stacks allocated with vmalloc andrey.konovalov 2021-12-06 21:43 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 23/34] kasan, vmalloc: add vmalloc support to SW_TAGS andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 24/34] kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:48 ` Andrey Konovalov 2021-12-06 21:48 ` Andrey Konovalov 2021-12-13 15:17 ` Vincenzo Frascino 2021-12-13 15:17 ` Vincenzo Frascino 2021-12-13 21:57 ` Andrey Konovalov 2021-12-13 21:57 ` Andrey Konovalov 2021-12-06 21:44 ` [PATCH v2 25/34] kasan, vmalloc: don't unpoison VM_ALLOC pages before mapping andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 26/34] kasan, page_alloc: allow skipping unpoisoning for HW_TAGS andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 27/34] kasan, page_alloc: allow skipping memory init " andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 28/34] kasan, vmalloc: add vmalloc support to HW_TAGS andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:49 ` Andrey Konovalov 2021-12-06 21:49 ` Andrey Konovalov 2021-12-13 15:34 ` Vincenzo Frascino 2021-12-13 15:34 ` Vincenzo Frascino 2021-12-13 21:57 ` Andrey Konovalov 2021-12-13 21:57 ` Andrey Konovalov 2021-12-06 21:44 ` [PATCH v2 29/34] kasan: mark kasan_arg_stacktrace as __initdata andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 30/34] kasan: simplify kasan_init_hw_tags andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 31/34] kasan: add kasan.vmalloc command line flag andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 32/34] arm64: select KASAN_VMALLOC for SW/HW_TAGS modes andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-10 18:04 ` Catalin Marinas 2021-12-10 18:04 ` Catalin Marinas 2021-12-06 21:44 ` [PATCH v2 33/34] kasan: documentation updates andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-06 21:44 ` [PATCH v2 34/34] kasan: improve vmalloc tests andrey.konovalov 2021-12-06 21:44 ` andrey.konovalov 2021-12-07 19:46 ` [PATCH v2 00/34] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS Andrey Konovalov 2021-12-07 19:46 ` Andrey Konovalov
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