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Groups > linux.debian.kernel > #65502

Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec")

Cross-posted to 2 groups.

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Hi Ansgar,

On Fri, Oct 25, 2019 at 10:59:09AM +0200, Ansgar wrote:
> I tried running `sign-file` manually and can reproduce the truncated
> file with Debian's production key.  I also tried signing the same key
> with a test key instead of the production key: then the signature is 256
> bytes long, just as with any other file...
> 
> `strace -e write sign-file` reports only a single call to `write()`
> which writes the entire file in one go.  The return value also matches
> the number of bytes asked to be written in every case.

Cool, thanks for reproducing the issue! Just one question: when you say
production key, does that mean a hardware security module like Ben mentioned,
or can you reproduce this with a fully software implementation?

Provided the latter, that means there exists an input to sign-file that
produces an invalid (shorter) signature, and it's likely we can find another
combination of key/module that also fails, and that can be made public (as
opposed to the Debian production key). I don't have the computing resources
for this, but if we're sure the reproducer exists, someone at LKML might.

Otherwise I'm afraid you might need to dig a bit deeper. :-)

-- 
Tomáš Janoušek, a.k.a. Pivník, a.k.a. Liskni_si, http://work.lisk.in/

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Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Josh Triplett <josh@joshtriplett.org> - 2019-10-22 21:00 +0200
  Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Tomas Janousek <tomi@nomi.cz> - 2019-10-23 00:20 +0200
    Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Tomas Janousek <tomi@nomi.cz> - 2019-10-23 09:40 +0200
      Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Tomas Janousek <tomi@nomi.cz> - 2019-10-23 17:30 +0200
        Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Ben Hutchings <ben@decadent.org.uk> - 2019-10-25 04:00 +0200
          Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Ansgar <ansgar@43-1.org> - 2019-10-25 09:50 +0200
            Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Tomas Janousek <tomi@nomi.cz> - 2019-10-25 10:00 +0200
              Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Ansgar <ansgar@43-1.org> - 2019-10-25 11:10 +0200
                Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Tomas Janousek <tomi@nomi.cz> - 2019-10-25 11:30 +0200
                Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Ansgar <ansgar@43-1.org> - 2019-10-25 12:00 +0200
          Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Ansgar Burchardt <ansgar@debian.org> - 2019-10-25 10:30 +0200
            Bug#942881: Audio on Lenovo X1 Carbon 5th generation stopped working after upgrade to linux-image-5.3.0-1-amd64 ("No response from codec") Ben Hutchings <ben@decadent.org.uk> - 2019-10-25 15:20 +0200
  Bug#942881: Confirming bug on Dell XPS 13 9360R Wilhelm Westermark <wilhelm@westermark.org> - 2019-10-23 01:20 +0200

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