[v7,09/41] arm64: kasan: Align allocations for HW_TAGS

Message ID	5d790812e7b0e8fd6747b0f2cb38de52c686de32.1604333009.git.andreyknvl@google.com (mailing list archive)
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Headers	show Return-Path: <SRS0=YsDo=EI=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A0A522277 Date: Mon, 2 Nov 2020 17:03:49 +0100 In-Reply-To: <cover.1604333009.git.andreyknvl@google.com> Message-Id: <5d790812e7b0e8fd6747b0f2cb38de52c686de32.1604333009.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1604333009.git.andreyknvl@google.com> Subject: [PATCH v7 09/41] arm64: kasan: Align allocations for HW_TAGS From: Andrey Konovalov <andreyknvl@google.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>, kasan-dev@googlegroups.com, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>, Evgenii Stepanov <eugenis@google.com>, Elena Petrova <lenaptr@google.com>, Branislav Rankov <Branislav.Rankov@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	kasan: add hardware tag-based mode for arm64 \| expand [v7,00/41] kasan: add hardware tag-based mode for arm64 [v7,01/41] arm64: Enable armv8.5-a asm-arch option [v7,02/41] arm64: mte: Add in-kernel MTE helpers [v7,03/41] arm64: mte: Reset the page tag in page->flags [v7,04/41] arm64: kasan: Add arch layer for memory tagging helpers [v7,05/41] arm64: mte: Add in-kernel tag fault handler [v7,06/41] arm64: kasan: Enable in-kernel MTE [v7,07/41] arm64: mte: Convert gcr_user into an exclude mask [v7,08/41] arm64: mte: Switch GCR_EL1 in kernel entry and exit [v7,09/41] arm64: kasan: Align allocations for HW_TAGS [v7,10/41] kasan: drop unnecessary GPL text from comment headers [v7,11/41] kasan: KASAN_VMALLOC depends on KASAN_GENERIC [v7,12/41] kasan: group vmalloc code [v7,13/41] s390/kasan: include asm/page.h from asm/kasan.h [v7,14/41] kasan: shadow declarations only for software modes [v7,15/41] kasan: rename (un)poison_shadow to (un)poison_memory [v7,16/41] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* [v7,17/41] kasan: only build init.c for software modes [v7,18/41] kasan: split out shadow.c from common.c [v7,19/41] kasan: define KASAN_GRANULE_PAGE [v7,20/41] kasan: rename report and tags files [v7,21/41] kasan: don't duplicate config dependencies [v7,22/41] kasan: hide invalid free check implementation [v7,23/41] kasan: decode stack frame only with KASAN_STACK_ENABLE [v7,24/41] kasan, arm64: only init shadow for software modes [v7,25/41] kasan, arm64: only use kasan_depth for software modes [v7,26/41] kasan: rename addr_has_shadow to addr_has_metadata [v7,27/41] kasan: rename print_shadow_for_address to print_memory_metadata [v7,28/41] kasan: kasan_non_canonical_hook only for software modes [v7,29/41] kasan: rename SHADOW layout macros to META [v7,30/41] kasan: separate metadata_fetch_row for each mode [v7,31/41] kasan, arm64: don't allow SW_TAGS with ARM64_MTE [v7,32/41] kasan: introduce CONFIG_KASAN_HW_TAGS [v7,33/41] kasan: define KASAN_GRANULE_SIZE for HW_TAGS [v7,34/41] kasan, x86, s390: update undef CONFIG_KASAN [v7,35/41] kasan, arm64: expand CONFIG_KASAN checks [v7,36/41] kasan, arm64: implement HW_TAGS runtime [v7,37/41] kasan, arm64: print report from tag fault handler [v7,38/41] kasan, mm: reset tags when accessing metadata [v7,39/41] kasan, arm64: enable CONFIG_KASAN_HW_TAGS [v7,40/41] kasan: add documentation for hardware tag-based mode [v7,41/41] kselftest/arm64: Check GCR_EL1 after context switch

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DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A0A522277
Date: Mon,  2 Nov 2020 17:03:49 +0100
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Subject: [PATCH v7 09/41] arm64: kasan: Align allocations for HW_TAGS
From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
 Will Deacon <will.deacon@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>, kasan-dev@googlegroups.com,
	Dmitry Vyukov <dvyukov@google.com>,
 Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>,
	Evgenii Stepanov <eugenis@google.com>, Elena Petrova <lenaptr@google.com>,
	Branislav Rankov <Branislav.Rankov@arm.com>,
 Kevin Brodsky <kevin.brodsky@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
 linux-arm-kernel@lists.infradead.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrey Konovalov <andreyknvl@google.com>
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Series

kasan: add hardware tag-based mode for arm64 | expand

Commit Message

Andrey Konovalov Nov. 2, 2020, 4:03 p.m. UTC

Hardware tag-based KASAN uses the memory tagging approach, which requires
all allocations to be aligned to the memory granule size. Align the
allocations to MTE_GRANULE_SIZE via ARCH_SLAB_MINALIGN when
CONFIG_KASAN_HW_TAGS is enabled.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
Change-Id: I51ebd3f9645e6330e5a92973bf7c86b62d632c2b
---
 arch/arm64/include/asm/cache.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
index 63d43b5f82f6..77cbbe3625f2 100644
--- a/arch/arm64/include/asm/cache.h
+++ b/arch/arm64/include/asm/cache.h
@@ -6,6 +6,7 @@ 
 #define __ASM_CACHE_H
 
 #include <asm/cputype.h>
+#include <asm/mte-kasan.h>
 
 #define CTR_L1IP_SHIFT		14
 #define CTR_L1IP_MASK		3
@@ -51,6 +52,8 @@ 
 
 #ifdef CONFIG_KASAN_SW_TAGS
 #define ARCH_SLAB_MINALIGN	(1ULL << KASAN_SHADOW_SCALE_SHIFT)
+#elif defined(CONFIG_KASAN_HW_TAGS)
+#define ARCH_SLAB_MINALIGN	MTE_GRANULE_SIZE
 #endif
 
 #ifndef __ASSEMBLY__

[v7,09/41] arm64: kasan: Align allocations for HW_TAGS

Commit Message

Patch