linux-kernel - RE: [PATCH] IA64: fix VT-d dma_mapping

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]

Date:	Sat, 22 Nov 2008 08:18:02 -0800
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	'FUJITA Tomonori' <fujita.tomonori@....ntt.co.jp>,
	"Luck, Tony" <tony.luck@...el.com>,
	"'dwmw2@...radead.org'" <dwmw2@...radead.org>
CC:	"'linux-ia64@...r.kernel.org'" <linux-ia64@...r.kernel.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'mingo@...e.hu'" <mingo@...e.hu>
Subject: RE: [PATCH] IA64: fix VT-d dma_mapping_error

 
>+int intel_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
>+{
>+	return !dma_addr;
>+}

The implementation of inte_dma_mapping_error is incomplete.

Dma_addr is valid only when it belongs to hwdev's domain. This is all about VT-d isolation fundamental.

+int intel_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
+{
+        struct pci_dev *pdev = to_pci_dev(hwdev);
+        struct dmar_domain *domain;
+        struct iova *iova;
+
+        domain = find_domain(pdev);
+
+        iova = find_iova(&domain->iovad, IOVA_PFN(dma_addr));
+        if (!iova)
+                return -EINVAL;
+	   return 0;
+}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/