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Date: Fri, 26 Jan 2024 10:17:23 -0800
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Subject: Re: [PATCH 5.10 000/286] 5.10.209-rc1 review
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To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org, patches@lists.linux.dev,
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From: Guenter Roeck <linux@roeck-us.net>
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In-Reply-To: <2024012636-clubbed-radial-1997@gregkh>
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On 1/26/24 09:51, Greg Kroah-Hartman wrote:
> On Fri, Jan 26, 2024 at 08:46:42AM -0800, Guenter Roeck wrote:
>> On 1/22/24 15:55, Greg Kroah-Hartman wrote:
>>> This is the start of the stable review cycle for the 5.10.209 release.
>>> There are 286 patches in this series, all will be posted as a response
>>> to this one.  If anyone has any issues with these being applied, please
>>> let me know.
>>>
>>> Responses should be made by Wed, 24 Jan 2024 23:56:49 +0000.
>>> Anything received after that time might be too late.
>>>
>> [ ... ]
>>
>>> zhenwei pi <pizhenwei@bytedance.com>
>>>       virtio-crypto: implement RSA algorithm
>>>
>>
>> Curious: Why was this (and its subsequent fixes) backported to v5.10.y ?
>> It is quite beyond a bug fix. Also, unless I am really missing something,
>> the series (or at least this patch) was not applied to v5.15.y, so we now
>> have functionality in v5.10.y which is not in v5.15.y.
> 
> See the commit text, it was a dependency of a later fix and documented
> as such.
> 
> Having it in 5.10 and not 5.15 is a bit odd, I agree, so patches are
> gladly accepted :)
> 

We reverted the entire series from the merge because it results in a build
failure for us.

In file included from /home/groeck/src/linux-chromeos/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c:10:
In file included from /home/groeck/src/linux-chromeos/include/linux/mpi.h:21:
In file included from /home/groeck/src/linux-chromeos/include/linux/scatterlist.h:5:
In file included from /home/groeck/src/linux-chromeos/include/linux/string.h:293:
/home/groeck/src/linux-chromeos/include/linux/fortify-string.h:512:4: error: call to __read_overflow2_field declared with 'warning' attribute: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
                         __read_overflow2_field(q_size_field, size);

I also see that upstream (starting with 6.1) when trying to build it with clang,
so I guess it is one of those bug-for-bug compatibility things. I really have
no idea what causes it, or why we don't see the problem when building
chromeos-6.1 or chromeos-6.6, but (so far) only with chromeos-5.10 after
merging 5.10.209 into it. Making things worse, the problem isn't _always_
seen. Sometimes I can compile the file in 6.1.y without error, sometimes not.
I have no idea what triggers the problem. Of course, on top of all that,
the error message is completely useless.

Either case, we don't use that code in chromeos-5.10, so reverting the
entire series from the merge was the easiest way to proceed. But we really
don't have an incentive to apply the series to v5.15.y because we don't
need/use it there, and we might end up having to revert it from there
as well if it is applied.

Guenter