From: Marco Elver <elver@google.com> To: Andrey Konovalov <andreyknvl@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Dmitry Vyukov <dvyukov@google.com>, Alexander Potapenko <glider@google.com>, Andrew Morton <akpm@linux-foundation.org>, Will Deacon <will.deacon@arm.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Peter Collingbourne <pcc@google.com>, Evgenii Stepanov <eugenis@google.com>, Branislav Rankov <Branislav.Rankov@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 03/12] kasan: optimize large kmalloc poisoning Date: Tue, 2 Feb 2021 17:57:25 +0100 [thread overview] Message-ID: <YBmEdf4T5/0tpalT@elver.google.com> (raw) In-Reply-To: <8fdbf86842f4eaf2458ecd23d0844058dbc2c7a2.1612208222.git.andreyknvl@google.com> On Mon, Feb 01, 2021 at 08:43PM +0100, Andrey Konovalov wrote: > Similarly to kasan_kmalloc(), kasan_kmalloc_large() doesn't need > to unpoison the object as it as already unpoisoned by alloc_pages() > (or by ksize() for krealloc()). > > This patch changes kasan_kmalloc_large() to only poison the redzone. > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> > --- > mm/kasan/common.c | 20 +++++++++++++++----- > 1 file changed, 15 insertions(+), 5 deletions(-) > > diff --git a/mm/kasan/common.c b/mm/kasan/common.c > index 128cb330ca73..a7eb553c8e91 100644 > --- a/mm/kasan/common.c > +++ b/mm/kasan/common.c > @@ -494,7 +494,6 @@ EXPORT_SYMBOL(__kasan_kmalloc); > void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, > gfp_t flags) > { > - struct page *page; > unsigned long redzone_start; > unsigned long redzone_end; > > @@ -504,12 +503,23 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, > if (unlikely(ptr == NULL)) > return NULL; > > - page = virt_to_page(ptr); > + /* > + * The object has already been unpoisoned by kasan_alloc_pages() for > + * alloc_pages() or by ksize() for krealloc(). > + */ > + > + /* > + * The redzone has byte-level precision for the generic mode. > + * Partially poison the last object granule to cover the unaligned > + * part of the redzone. > + */ > + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) > + kasan_poison_last_granule(ptr, size); > + > + /* Poison the aligned part of the redzone. */ > redzone_start = round_up((unsigned long)(ptr + size), > KASAN_GRANULE_SIZE); > - redzone_end = (unsigned long)ptr + page_size(page); > - > - kasan_unpoison(ptr, size); > + redzone_end = (unsigned long)ptr + page_size(virt_to_page(ptr)); > kasan_poison((void *)redzone_start, redzone_end - redzone_start, > KASAN_PAGE_REDZONE); > > -- > 2.30.0.365.g02bc693789-goog >
WARNING: multiple messages have this Message-ID (diff)
From: Marco Elver <elver@google.com> To: Andrey Konovalov <andreyknvl@google.com> Cc: linux-arm-kernel@lists.infradead.org, Branislav Rankov <Branislav.Rankov@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, Alexander Potapenko <glider@google.com>, Evgenii Stepanov <eugenis@google.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Andrew Morton <akpm@linux-foundation.org>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Peter Collingbourne <pcc@google.com>, Dmitry Vyukov <dvyukov@google.com> Subject: Re: [PATCH 03/12] kasan: optimize large kmalloc poisoning Date: Tue, 2 Feb 2021 17:57:25 +0100 [thread overview] Message-ID: <YBmEdf4T5/0tpalT@elver.google.com> (raw) In-Reply-To: <8fdbf86842f4eaf2458ecd23d0844058dbc2c7a2.1612208222.git.andreyknvl@google.com> On Mon, Feb 01, 2021 at 08:43PM +0100, Andrey Konovalov wrote: > Similarly to kasan_kmalloc(), kasan_kmalloc_large() doesn't need > to unpoison the object as it as already unpoisoned by alloc_pages() > (or by ksize() for krealloc()). > > This patch changes kasan_kmalloc_large() to only poison the redzone. > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> > --- > mm/kasan/common.c | 20 +++++++++++++++----- > 1 file changed, 15 insertions(+), 5 deletions(-) > > diff --git a/mm/kasan/common.c b/mm/kasan/common.c > index 128cb330ca73..a7eb553c8e91 100644 > --- a/mm/kasan/common.c > +++ b/mm/kasan/common.c > @@ -494,7 +494,6 @@ EXPORT_SYMBOL(__kasan_kmalloc); > void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, > gfp_t flags) > { > - struct page *page; > unsigned long redzone_start; > unsigned long redzone_end; > > @@ -504,12 +503,23 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, > if (unlikely(ptr == NULL)) > return NULL; > > - page = virt_to_page(ptr); > + /* > + * The object has already been unpoisoned by kasan_alloc_pages() for > + * alloc_pages() or by ksize() for krealloc(). > + */ > + > + /* > + * The redzone has byte-level precision for the generic mode. > + * Partially poison the last object granule to cover the unaligned > + * part of the redzone. > + */ > + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) > + kasan_poison_last_granule(ptr, size); > + > + /* Poison the aligned part of the redzone. */ > redzone_start = round_up((unsigned long)(ptr + size), > KASAN_GRANULE_SIZE); > - redzone_end = (unsigned long)ptr + page_size(page); > - > - kasan_unpoison(ptr, size); > + redzone_end = (unsigned long)ptr + page_size(virt_to_page(ptr)); > kasan_poison((void *)redzone_start, redzone_end - redzone_start, > KASAN_PAGE_REDZONE); > > -- > 2.30.0.365.g02bc693789-goog > _______________________________________________ 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:[~2021-02-02 17:01 UTC|newest] Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-01 19:43 [PATCH 00/12] kasan: optimizations and fixes for HW_TAGS Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` [PATCH 01/12] kasan, mm: don't save alloc stacks twice Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-02 16:06 ` Marco Elver 2021-02-02 16:06 ` Marco Elver 2021-02-02 18:01 ` Andrey Konovalov 2021-02-02 18:01 ` Andrey Konovalov 2021-02-02 18:01 ` Andrey Konovalov 2021-02-02 18:40 ` Marco Elver 2021-02-02 18:40 ` Marco Elver 2021-02-02 18:40 ` Marco Elver 2021-02-01 19:43 ` [PATCH 02/12] kasan, mm: optimize kmalloc poisoning Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-02 16:25 ` Marco Elver 2021-02-02 16:25 ` Marco Elver 2021-02-02 17:15 ` Andrey Konovalov 2021-02-02 17:15 ` Andrey Konovalov 2021-02-02 17:15 ` Andrey Konovalov 2021-02-02 17:39 ` Marco Elver 2021-02-02 17:39 ` Marco Elver 2021-02-02 17:39 ` Marco Elver 2021-02-01 19:43 ` [PATCH 03/12] kasan: optimize large " Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-02 16:57 ` Marco Elver [this message] 2021-02-02 16:57 ` Marco Elver 2021-02-01 19:43 ` [PATCH 04/12] kasan: clean up setting free info in kasan_slab_free Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-02 17:03 ` Marco Elver 2021-02-02 17:03 ` Marco Elver 2021-02-01 19:43 ` [PATCH 05/12] kasan: unify large kfree checks Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-03 12:13 ` Marco Elver 2021-02-03 12:13 ` Marco Elver 2021-02-01 19:43 ` [PATCH 06/12] kasan: rework krealloc tests Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-03 14:48 ` Marco Elver 2021-02-03 14:48 ` Marco Elver 2021-02-01 19:43 ` [PATCH 07/12] kasan, mm: remove krealloc side-effect Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-03 15:10 ` Marco Elver 2021-02-03 15:10 ` Marco Elver 2021-02-01 19:43 ` [PATCH 08/12] kasan, mm: optimize krealloc poisoning Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-03 14:34 ` Marco Elver 2021-02-03 14:34 ` Marco Elver 2021-02-01 19:43 ` [PATCH 09/12] kasan: ensure poisoning size alignment Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-03 15:31 ` Marco Elver 2021-02-03 15:31 ` Marco Elver 2021-02-01 19:43 ` [PATCH 10/12] arm64: kasan: simplify and inline MTE functions Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 22:44 ` Andrew Morton 2021-02-01 22:44 ` Andrew Morton 2021-02-04 12:39 ` Vincenzo Frascino 2021-02-04 12:39 ` Vincenzo Frascino 2021-02-02 15:42 ` Catalin Marinas 2021-02-02 15:42 ` Catalin Marinas 2021-02-02 18:04 ` Andrey Konovalov 2021-02-02 18:04 ` Andrey Konovalov 2021-02-02 18:04 ` Andrey Konovalov 2021-02-04 12:37 ` Vincenzo Frascino 2021-02-04 12:37 ` Vincenzo Frascino 2021-02-01 19:43 ` [PATCH 11/12] kasan: always inline HW_TAGS helper functions Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-03 15:51 ` Marco Elver 2021-02-03 15:51 ` Marco Elver 2021-02-01 19:43 ` [PATCH 12/12] arm64: kasan: export MTE symbols for KASAN tests Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-01 19:43 ` Andrey Konovalov 2021-02-02 10:46 ` Will Deacon 2021-02-02 10:46 ` Will Deacon 2021-02-02 13:42 ` Andrey Konovalov 2021-02-02 13:42 ` Andrey Konovalov 2021-02-02 13:42 ` Andrey Konovalov 2021-02-02 15:43 ` Catalin Marinas 2021-02-02 15:43 ` Catalin Marinas
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