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From: Jan Beulich <jbeulich@suse.com>
To: Ian Jackson <iwj@xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	xen-devel@lists.xenproject.org,
	"Roger Pau Monné" <roger.pau@citrix.com>,
	"committers@xenproject.org" <committers@xenproject.org>
Subject: Re: Regressed XSA-286, was [xen-unstable test] 161917: regressions - FAIL
Date: Thu, 17 Jun 2021 16:55:04 +0200	[thread overview]
Message-ID: <da901c8c-cef0-e4e6-bd27-dbc21cb25523@suse.com> (raw)
In-Reply-To: <24779.24810.167567.520077@mariner.uk.xensource.com>

On 17.06.2021 16:49, Ian Jackson wrote:
> Jan Beulich writes ("Re: Regressed XSA-286, was [xen-unstable test] 161917: regressions - FAIL"):
>> If any OS made such an assumption, then I don't think it would be
>> a vulnerability either. It would simply be a guest kernel bug then.
> 
> For the avoidance of doubt:
> 
> I think you are saying that if any OS did make the assumption, the
> resulting bug *would not be exploitable* (by an unprivileged guest
> process, or by a PV backend it was speaking to, or, somehow, by
> another guest).

Not exactly: Whether such a kernel bug would also be a vulnerability
cannot be told without knowing how exactly the kernel screwed up.
But it's definitely not Xen to compensate for this, imo. But anyway,
this it largely moot, as there isn't - afaict - any OS making any
such assumption.

Jan



  reply	other threads:[~2021-06-17 14:55 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-13  3:56 osstest service owner
2021-05-13 20:15 ` Regressed XSA-286, was " Andrew Cooper
2021-05-17  8:43   ` Jan Beulich
2021-05-17 10:59     ` Jan Beulich
2021-06-16  8:48   ` Jan Beulich
2021-06-16 15:43     ` Andrew Cooper
2021-06-17 11:56       ` Jan Beulich
2021-06-17 13:05         ` Ian Jackson
2021-06-17 14:40           ` Jan Beulich
2021-06-17 14:49             ` Ian Jackson
2021-06-17 14:55               ` Jan Beulich [this message]
2021-06-28 12:35           ` Ping: " Jan Beulich
2021-06-17 21:26         ` Stefano Stabellini

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