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Date: Thu, 7 Apr 2022 17:16:26 +0800
From: Qiuhao Li <qiuhao@...ec.org>
To: Solar Designer <solar@...nwall.com>, kangel <kangel@....edu.cn>
Cc: oss-security@...ts.openwall.com, pgn@....edu.cn,
Pedro Sampaio <psampaio@...hat.com>, pbonzini@...hat.com
Subject: Re: Linux kernel: x86/kvm: null-ptr-deref in
kvm_dirty_ring_push
On 4/7/22 16:35, Solar Designer wrote:
> Further in the linux-distros thread, this got assigned CVE-2022-1263,
> however is this really a security issue - in other words, is a security
> boundary crossed in triggering the bug? I think it is not, and if so
> the CVE ID should probably be rejected. From the PoC:
>
>> res = syscall(__NR_openat, 0xffffffffffffff9cul, "/dev/kvm", 0ul, 0ul);
We sent the report to oss-security as instructed by linux-distro.
As Paolo said, /dev/kvm can be accessed by an unprivileged local user.
So it's a Dos. It also seems like there is a kernel NPD issue on oss
before: https://www.openwall.com/lists/oss-security/2022/04/02/5
>
> In fact, also in the linux-distros thread it was promptly agreed that
> this doesn't need an embargo - perhaps precisely because of no security
> relevance? If so, that should have been said explicitly, so a CVE ID
> wouldn't be assigned (it was by another person).
We are willing to cooperate with the final decision of the CVE issuer
and oss-security.
Personally, I agree with Paolo this is not a scary bug. No embargo makes
it be fixed quickly.
Regards,
Qiuhao Li
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