linux-kernel - Re: [RFC 1/1] swiotlb: Replace BUG_ON() with graceful error handling

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Message-ID: <20241125075912.GA16480@lst.de>
Date: Mon, 25 Nov 2024 08:59:12 +0100
From: Christoph Hellwig <hch@....de>
To: Brian Johannesmeyer <bjohannesmeyer@...il.com>
Cc: Tianyu Lan <Tianyu.Lan@...rosoft.com>,
	Michael Kelley <mikelley@...rosoft.com>,
	Christoph Hellwig <hch@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Raphael Isemann <teemperor@...il.com>,
	Cristiano Giuffrida <giuffrida@...vu.nl>,
	Herbert Bos <h.j.bos@...nl>, Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [RFC 1/1] swiotlb: Replace BUG_ON() with graceful error
 handling

On Fri, Nov 22, 2024 at 08:13:04PM +0100, Brian Johannesmeyer wrote:
> Replace the BUG_ON() assertion in swiotlb_release_slots() with a
> conditional check and return. This change prevents a corrupted tlb_addr
> from causing a kernel panic.

We'll at least want a WARN_ON_ONCE here.  But what is the threat model
here?  The tlb_addr is handed out by swiotlb and should not be modified
by the driver.