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From: Alexander Popov <alex.popov@linux.com>
To: John Snow <jsnow@redhat.com>,
	qemu-block@nongnu.org, qemu-devel@nongnu.org,
	qemu-stable@nongnu.org, mst@redhat.com, pmatouse@redhat.com,
	sstabellini@kernel.org, mdroth@linux.vnet.ibm.com,
	pjp@redhat.com
Subject: Re: [Qemu-devel] [QEMU-SECURITY] ide: fix assertion in ide_dma_cb() to prevent qemu DoS from quest
Date: Fri, 5 Jul 2019 17:13:06 +0300	[thread overview]
Message-ID: <fb3870a9-3802-41ce-7d26-d2be20f74c45@linux.com> (raw)
In-Reply-To: <1562335669-10127-1-git-send-email-alex.popov@linux.com>

On 05.07.2019 17:07, Alexander Popov wrote:
> This assertion was introduced in the commit a718978ed58a in July 2015.
> It implies that the size of successful DMA transfers handled in
> ide_dma_cb() should be multiple of 512 (the size of a sector).
> 
> But guest systems can initiate DMA transfers that don't fit this
> requirement. Let's improve the assertion to prevent qemu DoS from quests.

Hello everyone!

This bug was not considered as a security issue by QEMU security team, so I send
this patch to the public mailing list.

Best regards,
Alexander


  reply	other threads:[~2019-07-05 14:44 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-05 14:07 [Qemu-devel] [QEMU-SECURITY] ide: fix assertion in ide_dma_cb() to prevent qemu DoS from quest Alexander Popov
2019-07-05 14:13 ` Alexander Popov [this message]
2019-07-15 11:24 ` Alexander Popov
2019-07-16 11:25   ` [Qemu-devel] [Qemu-block] " Kevin Wolf
2019-07-16 14:57     ` John Snow
2019-07-16 16:18       ` P J P
2019-07-26  0:25 ` [Qemu-devel] " John Snow
2019-07-26 21:09   ` Alexander Popov
2019-11-06 12:05   ` Michael S. Tsirkin
2019-11-06 22:05     ` Alexander Popov
2019-11-14 17:31       ` Alexander Popov
2019-11-06 10:17 ` Alexander Popov
2019-11-06 12:08   ` Michael S. Tsirkin
2019-11-06 22:01     ` Alexander Popov

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