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

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Message-ID: <CALCETrXg9-OpJx5Rqz8afyaug+0DjzxvpdbOV9q6i01=zCZbcQ@mail.gmail.com>
Date:   Wed, 12 Oct 2016 22:39:49 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Wireless List <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [mac80211] BUG_ON with current -git (4.8.0-11417-g24532f7)

On Wed, Oct 12, 2016 at 7:22 AM, Johannes Berg
<johannes@...solutions.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.