linux-kernel - [PATCH 18/19] iommu/vt-d: Make sure copied over IR entries are not reused

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, 13 Jun 2015 08:47:26 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	David Woodhouse <dwmw2@...radead.org>, zhen-hual@...com,
	bhe@...hat.com, ddutile@...hat.com, alex.williamson@...hat.com,
	dyoung@...hat.com, linux-kernel@...r.kernel.org,
	jroedel@...tes.org, joro@...tes.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 18/19] iommu/vt-d: Make sure copied over IR entries are not reused

From: Joerg Roedel <jroedel@...e.de>

Walk over the copied entries and mark the present ones as
allocated.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/intel_irq_remapping.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 2a90121..14e10de 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -451,6 +451,7 @@ static int iommu_load_old_irte(struct intel_iommu *iommu)
 {
 	struct irte *old_ir_table;
 	phys_addr_t irt_phys;
+	unsigned int i;
 	size_t size;
 	u64 irta;
 
@@ -481,6 +482,15 @@ static int iommu_load_old_irte(struct intel_iommu *iommu)
 
 	__iommu_flush_cache(iommu, iommu->ir_table->base, size);
 
+	/*
+	 * Now check the table for used entries and mark those as
+	 * allocated in the bitmap
+	 */
+	for (i = 0; i < INTR_REMAP_TABLE_ENTRIES; i++) {
+		if (iommu->ir_table->base[i].present)
+			bitmap_set(iommu->ir_table->bitmap, i, 1);
+	}
+
 	return 0;
 }
 
-- 
1.9.1

--
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/