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From: Andrey Konovalov <andreyknvl@google.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
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	Christoph Lameter <cl@linux.com>,
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	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <michal.lkml@markovi.net>,
	"GitAuthor : Andrey Konovalov" <andreyknvl@google.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Yury Norov <ynorov@caviumnetworks.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
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	Punit Agrawal <punit.agrawal@arm.com>,
	Dave Martin <Dave.Martin@arm.com>,
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	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry@arm.com>,
	Steve Capper <steve.capper@arm.com>,
	Tyler Baicar <tbaicar@codeaurora.org>,
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	Herbert Xu <herbert@gondor.apana.org.au>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Arnd Bergmann <arnd@arndb.de>,
	kasan-dev@googlegroups.com, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
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	kvmarm@lists.cs.columbia.edu, linux-sparse@vger.kernel.org,
	linux-mm@kvack.org, linux-kbuild@vger.kernel.org
Cc: Kostya Serebryany <kcc@google.com>,
	Evgeniy Stepanov <eugenis@google.com>,
	Lee Smith <Lee.Smith@arm.com>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
	Jacob Bramley <Jacob.Bramley@arm.com>,
	Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
	Kees Cook <keescook@google.com>, Jann Horn <jannh@google.com>,
	Mark Brand <markbrand@google.com>
Subject: [RFC PATCH v3 05/15] khwasan, arm64: untag virt address in __kimg_to_phys
Date: Fri, 20 Apr 2018 16:46:43 +0200	[thread overview]
Message-ID: <6f8133fa9e0c4adb15bb36a540cd7f923d000f3c.1524235387.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1524235387.git.andreyknvl@google.com>
In-Reply-To: <cover.1524235387.git.andreyknvl@google.com>

__kimg_to_phys (which is used by virt_to_phys) assumes that the top byte
of the address is 0xff, which isn't always the case with KHWASAN enabled.
The solution is to reset the tag in __kimg_to_phys.

__lm_to_phys doesn't require any fixups, as it zeroes out the top byte
with the current implementation.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 arch/arm64/include/asm/memory.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 6d084431b7f7..f206273469b5 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -92,6 +92,12 @@
 #define KASAN_THREAD_SHIFT	0
 #endif
 
+#ifdef CONFIG_KASAN_HW
+#define KASAN_TAG_SHIFTED(tag)		((unsigned long)(tag) << 56)
+#define KASAN_SET_TAG(addr, tag)	(((addr) & ~KASAN_TAG_SHIFTED(0xff)) | \
+						KASAN_TAG_SHIFTED(tag))
+#endif
+
 #define MIN_THREAD_SHIFT	(14 + KASAN_THREAD_SHIFT)
 
 /*
@@ -225,7 +231,12 @@ static inline unsigned long kaslr_offset(void)
 #define __is_lm_address(addr)	(!!((addr) & BIT(VA_BITS - 1)))
 
 #define __lm_to_phys(addr)	(((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
+
+#ifdef CONFIG_KASAN_HW
+#define __kimg_to_phys(addr)	(KASAN_SET_TAG((addr), 0xff) - kimage_voffset)
+#else
 #define __kimg_to_phys(addr)	((addr) - kimage_voffset)
+#endif
 
 #define __virt_to_phys_nodebug(x) ({					\
 	phys_addr_t __x = (phys_addr_t)(x);				\
-- 
2.17.0.484.g0c8726318c-goog

  parent reply	other threads:[~2018-04-20 14:46 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-20 14:46 [RFC PATCH v3 00/15] khwasan: kernel hardware assisted address sanitizer Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 01/15] khwasan: move common kasan and khwasan code to common.c Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 02/15] khwasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_HW Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 03/15] khwasan, arm64: adjust shadow size for CONFIG_KASAN_HW Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 04/15] khwasan: initialize shadow to 0xff Andrey Konovalov
2018-04-20 14:46 ` Andrey Konovalov [this message]
2018-04-20 14:46 ` [RFC PATCH v3 06/15] khwasan, arm64: fix up fault handling logic Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 07/15] khwasan: add tag related helper functions Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 08/15] khwasan, arm64: enable top byte ignore for the kernel Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 09/15] khwasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 10/15] khwasan: split out kasan_report.c from report.c Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 11/15] khwasan: add bug reporting routines Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 12/15] khwasan: add hooks implementation Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 13/15] khwasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 14/15] khwasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-04-20 14:46 ` [RFC PATCH v3 15/15] khwasan: update kasan documentation Andrey Konovalov

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