linux-kernel - [PATCH v4 6/8] iommu/vt-d: Handle PCI bridge RMRR device scopes in intel_iommu_get_resv

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190527085541.5294-7-eric.auger@redhat.com>
Date:   Mon, 27 May 2019 10:55:39 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, joro@...tes.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        dwmw2@...radead.org, lorenzo.pieralisi@....com,
        robin.murphy@....com, will.deacon@....com, hanjun.guo@...aro.org,
        sudeep.holla@....com
Cc:     alex.williamson@...hat.com, shameerali.kolothum.thodi@...wei.com
Subject: [PATCH v4 6/8] iommu/vt-d: Handle PCI bridge RMRR device scopes in intel_iommu_get_resv_regions

In the case the RMRR device scope is a PCI-PCI bridge, let's check
the device belongs to the PCI sub-hierarchy.

Fixes: 0659b8dc45a6 ("iommu/vt-d: Implement reserved region get/put callbacks")

Signed-off-by: Eric Auger <eric.auger@...hat.com>
---
 drivers/iommu/intel-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 7ed820e79313..a36604f4900f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5496,7 +5496,8 @@ static void intel_iommu_get_resv_regions(struct device *device,
 			struct iommu_resv_region *resv;
 			size_t length;
 
-			if (i_dev != device)
+			if (i_dev != device &&
+			    !is_downstream_to_pci_bridge(device, i_dev))
 				continue;
 
 			length = rmrr->end_address - rmrr->base_address + 1;
-- 
2.20.1