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List:       oss-security
Subject:    [oss-security] Re: CVE-2018-20124 QEMU: rdma: OOB access when building scatter-gather array
From:       P J P <ppandit () redhat ! com>
Date:       2018-12-18 11:26:07
Message-ID: nycvar.YSQ.7.76.1812181620570.9216 () xnncv
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+-- On Tue, 18 Dec 2018, saar amar wrote --+
| I'm wondering why it says "DOS" and not "execute arbitrary code on the host, 
| in the context of the QEMU process"? I have stack overflow, it pretty clear 
| I could gain more than simple DOS:)
| 
| What do your day?

IIUC, it's likely to corrupt adjacent stack variables and/or hit stack canary 
resulting in DoS. The scatter/gather entry object(struct ibv_sge) holds buffer 
address/length attributes used during r/w operations. If their values are 
astray, the following call to ibv_post_send() may suffer/return an error.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
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