From: Christoph Hellwig <hch@infradead.org>
To: David Woodhouse <dwmw2@infradead.org>,
Lu Baolu <baolu.lu@linux.intel.com>
Cc: iommu@lists.linux.dev
Subject: lack of permission checking with intel-iommu?
Date: Tue, 2 Jul 2024 00:46:59 -0700 [thread overview]
Message-ID: <ZoOwc7O5W0PUeja5@infradead.org> (raw)
Hi all,
we've recently had an interesting case where a device unexpectedly
modified a dma buffer passed to it. On AMD systems this caused iommu
faults because the buffer was mapped read only (DMA_FROM_DEVICE), but
on an Intel system everything worked fine as the IOMMU did not trip up
on the device writes to that buffer. Any idea why that could sneak
through?
next reply other threads:[~2024-07-02 7:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-02 7:46 Christoph Hellwig [this message]
2024-07-02 8:02 ` lack of permission checking with intel-iommu? Christoph Hellwig
2024-07-02 8:22 ` Baolu Lu
2024-07-02 8:25 ` Christoph Hellwig
2024-07-02 9:12 ` Baolu Lu
2024-07-02 11:42 ` Christoph Hellwig
2024-07-03 0:56 ` Tian, Kevin
2024-07-03 2:28 ` Baolu Lu
2024-07-02 8:47 ` Yi Liu
2024-07-02 9:07 ` Baolu Lu
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