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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Zhen Lei <thunder.leizhen@huawei.com>,
        Will Deacon <will.deacon@arm.com>,
        Sasha Levin <sashal@kernel.org>,
        iommu@lists.linux-foundation.org
Subject: [PATCH AUTOSEL 4.19 128/258] iommu/arm-smmu-v3: Avoid memory corruption from Hisilicon MSI payloads
Date:   Mon, 28 Jan 2019 10:57:14 -0500
Message-Id: <20190128155924.51521-128-sashal@kernel.org>
In-Reply-To: <20190128155924.51521-1-sashal@kernel.org>
References: <20190128155924.51521-1-sashal@kernel.org>
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From: Zhen Lei <thunder.leizhen@huawei.com>

[ Upstream commit 84a9a75774961612d0c7dd34a1777e8f98a65abd ]

The GITS_TRANSLATER MMIO doorbell register in the ITS hardware is
architected to be 4 bytes in size, yet on hi1620 and earlier, Hisilicon
have allocated the adjacent 4 bytes to carry some IMPDEF sideband
information which results in an 8-byte MSI payload being delivered when
signalling an interrupt:

MSIAddr:
	 |----4bytes----|----4bytes----|
	 |    MSIData   |    IMPDEF    |

This poses no problem for the ITS hardware because the adjacent 4 bytes
are reserved in the memory map. However, when delivering MSIs to memory,
as we do in the SMMUv3 driver for signalling the completion of a SYNC
command, the extended payload will corrupt the 4 bytes adjacent to the
"sync_count" member in struct arm_smmu_device. Fortunately, the current
layout allocates these bytes to padding, but this is fragile and we
should make this explicit.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
[will: Rewrote commit message and comment]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/arm-smmu-v3.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 3e02aace38b1..4afb9cb99ea3 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -586,7 +586,11 @@ struct arm_smmu_device {
 
 	struct arm_smmu_strtab_cfg	strtab_cfg;
 
-	u32				sync_count;
+	/* Hi16xx adds an extra 32 bits of goodness to its MSI payload */
+	union {
+		u32			sync_count;
+		u64			padding;
+	};
 
 	/* IOMMU core code handle */
 	struct iommu_device		iommu;
-- 
2.19.1