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Re: [Xen-devel] PLEASE REVERT URGENTLY: Re: [PATCH v5 2/3] x86/boot: add acpi rsdp address to setup_header
- To: "H. Peter Anvin" <hpa@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Sat, 10 Nov 2018 08:02:45 +0100
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- Cc: tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, corbet@xxxxxxx
- Delivery-date: Sat, 10 Nov 2018 07:03:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/11/2018 07:32, H. Peter Anvin wrote:
>>
>> Unfortunately there are many major distros shipping boot loaders which
>> write crap data past the end of setup_header.
>>
>
> Yes. We know that and it is resolved by:
>
> a) the length field in setup_header;
> b) the "sentinel" field which catches legacy non-compliant bootloaders.
Doesn't help for boot loaders reading struct setup_header from the
kernel image and then writing e.g. 512 bytes back to the setup_header
location. The sentinel is cleared and the length field just isn't
taken into account. And this is what happened.
>
>>>
>>> This field thus belongs in struct boot_params, not struct setup_header.
>>
>> Okay, I can change that. Hoping that all boot loaders really write
>> zeroes to that field in case they don't know it.
>>
>
> This is what we added the sentinel field for: bootloaders which don't zero
> unknown fields (read: Grub) will trigger the sentinel, and we wipe most of
> this structure.
Unfortunately the sentinel seems to be cleared by said broken grub.
Juergen
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