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From: Shyam Thombre <sthombre@codeaurora.org>
To: catalin.marinas@arm.com, will.deacon@arm.com,
	ard.biesheuvel@arm.com, mark.rutland@arm.com,
	anshuman.khandual@arm.com, sashal@kernel.org
Cc: Shyam Thombre <sthombre@codeaurora.org>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: mm: reset address tag set by kasan sw tagging
Date: Wed, 10 Jun 2020 16:39:44 +0530	[thread overview]
Message-ID: <1591787384-5823-1-git-send-email-sthombre@codeaurora.org> (raw)

KASAN sw tagging sets a random tag of 8 bits in the top byte of the pointer
returned by the memory allocating functions. So for the functions unaware
of this change, the top 8 bits of the address must be reset which is done
by the function arch_kasan_reset_tag().

Signed-off-by: Shyam Thombre <sthombre@codeaurora.org>
---
 arch/arm64/mm/mmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index e7fbc62..eae7655 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -723,6 +723,7 @@ int kern_addr_valid(unsigned long addr)
 	pmd_t *pmdp, pmd;
 	pte_t *ptep, pte;
 
+	addr = arch_kasan_reset_tag(addr);
 	if ((((long)addr) >> VA_BITS) != -1UL)
 		return 0;
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


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WARNING: multiple messages have this Message-ID (diff)
From: Shyam Thombre <sthombre@codeaurora.org>
To: catalin.marinas@arm.com, will.deacon@arm.com,
	ard.biesheuvel@arm.com, mark.rutland@arm.com,
	anshuman.khandual@arm.com, sashal@kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Shyam Thombre <sthombre@codeaurora.org>
Subject: [PATCH] arm64: mm: reset address tag set by kasan sw tagging
Date: Wed, 10 Jun 2020 16:39:44 +0530	[thread overview]
Message-ID: <1591787384-5823-1-git-send-email-sthombre@codeaurora.org> (raw)

KASAN sw tagging sets a random tag of 8 bits in the top byte of the pointer
returned by the memory allocating functions. So for the functions unaware
of this change, the top 8 bits of the address must be reset which is done
by the function arch_kasan_reset_tag().

Signed-off-by: Shyam Thombre <sthombre@codeaurora.org>
---
 arch/arm64/mm/mmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index e7fbc62..eae7655 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -723,6 +723,7 @@ int kern_addr_valid(unsigned long addr)
 	pmd_t *pmdp, pmd;
 	pte_t *ptep, pte;
 
+	addr = arch_kasan_reset_tag(addr);
 	if ((((long)addr) >> VA_BITS) != -1UL)
 		return 0;
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


             reply	other threads:[~2020-06-10 11:12 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-10 11:09 Shyam Thombre [this message]
2020-06-10 11:09 ` [PATCH] arm64: mm: reset address tag set by kasan sw tagging Shyam Thombre
2020-06-10 11:36 ` Catalin Marinas
2020-06-10 11:36   ` Catalin Marinas
2020-06-12 13:57   ` Shyam Thombre
2020-06-12 13:57     ` Shyam Thombre
2020-06-15 16:34 ` Will Deacon
2020-06-15 16:34   ` Will Deacon

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