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Message-ID: <f86cb36e-b331-8b8d-f087-5e2e8a5ae962@grsecurity.net>
Date:   Tue, 28 Mar 2023 14:29:11 +0200
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Subject: Re: Linux 5.15.103
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To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sasha Levin <sashal@kernel.org>
Cc:     stable@vger.kernel.org, linux-kernel@vger.kernel.org,
        akpm@linux-foundation.org, torvalds@linux-foundation.org,
        lwn@lwn.net, jslaby@suse.cz,
        Sean Christopherson <seanjc@google.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>
References: <1679040264214179@kroah.com>
 <c359c777-c3af-b4a6-791d-d51916160bf5@grsecurity.net>
 <ZCLaLWJiIsDV5yGr@kroah.com>
From:   Mathias Krause <minipli@grsecurity.net>
In-Reply-To: <ZCLaLWJiIsDV5yGr@kroah.com>
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On 28.03.23 14:14, Greg Kroah-Hartman wrote:
> On Tue, Mar 28, 2023 at 02:02:03PM +0200, Mathias Krause wrote:
>> On 17.03.23 09:04, Greg Kroah-Hartman wrote:
>>> I'm announcing the release of the 5.15.103 kernel.
>>>
>>> [...]
>>>
>>> Vitaly Kuznetsov (4):
>>>       KVM: Optimize kvm_make_vcpus_request_mask() a bit
>>>       KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request_except()
>>>       KVM: nVMX: Don't use Enlightened MSR Bitmap for L3
>>>       KVM: VMX: Introduce vmx_msr_bitmap_l01_changed() helper
>>>
>>
>> That list is missing commit 6470accc7ba9 ("KVM: x86: hyper-v: Avoid
>> calling kvm_make_vcpus_request_mask() with vcpu_mask==NULL") to fulfill
>> the prerequisite of "KVM: Optimize kvm_make_vcpus_request_mask() a bit".
>>
>> Right now the kvm selftests trigger a kernel NULL deref for the hyperv
>> test, making the system hang.
>>
>> Please consider applying commit 6470accc7ba9 for the next v5.15.x release.
> 
> It wasn't tagged for the stable kernels, so we didn't pick it up :(

Neither were any of the above commits. o.O

Commit 3e48a6349d29 ("KVM: Optimize kvm_make_vcpus_request_mask() a
bit") has this tag, though:

Stable-dep-of: 2b0128127373 ("KVM: Register /dev/kvm as the _very_ last
thing during initialization")

I don't know why, though. These two commits have little in common.
Maybe Sasha knows why?

> 
> Have now done so, thanks.

Thanks!

Mathias