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Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7)

From Andy Lutomirski <luto@amacapital.net>
Newsgroups linux.kernel
Subject Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7)
Date 2016-10-13 08:10 +0200
Message-ID <srHnj-87T-5@gated-at.bofh.it> (permalink)
References <sqKnf-2Nn-21@gated-at.bofh.it> <sqKQi-2WG-17@gated-at.bofh.it> <srnHY-2dx-15@gated-at.bofh.it> <srsxY-5Bl-15@gated-at.bofh.it> <srsHD-5Fa-1@gated-at.bofh.it>
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On Wed, Oct 12, 2016 at 7:22 AM, Johannes Berg
<johannes@sipsolutions.net> wrote:
>
>> > Can you elaborate on how exactly it kills your system?
>>
>> the last time I saw it it was a NULL deref at
>> ieee80211_aes_ccm_decrypt.
>
> Hm. I was expecting something within the crypto code would cause the
> crash, this seems strange.
>
> Anyway, I'm surely out of my depth wrt. the actual cause. Something
> like the patch below probably works around it, but it's horribly
> inefficient due to the locking and doesn't cover CMAC/GMAC either.

In a pinch, I have these patches sitting around:

https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=0a39cfa6fbb5d5635c85253cc7d6b44b54822afd
https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=bf8cfa200b5a01383ea39fc8ce2f32909767baa8

I don't like them, though.  I think it's rather silly that we can't
just pass virtual addresses to the crypto code.

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Thread

[mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-10 17:10 +0200
  Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-10 17:40 +0200
    Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-12 11:10 +0200
      Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-12 16:20 +0200
        Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-12 16:30 +0200
          Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Andy Lutomirski <luto@amacapital.net> - 2016-10-13 08:10 +0200
            Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-13 08:10 +0200
              Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-13 15:50 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-13 16:10 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-13 16:20 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-13 17:10 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2016-10-13 17:30 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Andy Lutomirski <luto@amacapital.net> - 2016-10-14 00:00 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 09:30 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 10:30 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 10:40 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 10:50 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 11:00 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 11:10 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 11:20 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 11:30 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 11:40 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 12:10 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 13:20 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 11:30 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-10-14 10:50 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 10:50 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 11:00 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Johannes Berg <johannes@sipsolutions.net> - 2016-10-14 10:50 +0200
                Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7) Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-10-14 10:50 +0200

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