[INFO] BCM and ISOTP crashes Linux 3.11 - 3.13 when running on REAL HW CAN interfaces

[Marc Kleine-Budde]

On 02/01/2014 07:14 PM, Oliver Hartkopp wrote:
> Hello all,
> 
> at 2013-08-01 Eric Dumazet created this patch to make sure some
> networking rules are enforced in the Linux Kernel in Linux 3.11:
> http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=376c7311bdb6efea3322310333576a04d73fbe4c
> 
> This affects CAN BCM and CAN ISOTP and leads to a KERNEL CRASH
> when you are *sending* with the BCM or ISOTP on REAL(!) CAN interfaces.
> 
> AFAIK there are not so many use cases. That's why it lasted 6 months to detect it :-(
> Virtual CAN and SLCAN interfaces do not have this problem (no echo skbs).
> 
> Do I have to care about this issue?
> 
> Usually the embedded systems do not have such a recent kernel.
> Regarding desktop distributions Redhat 7 runs a 3.10 kernel which is safe.
> 
> But e.g. OpenSuse 13.1 and Ubuntu 13.10 / Linux Mint Petra are based on
> Linux 3.11 and Debian Jessie (current Debian testing) is on Linux 3.12.
> 
> The latter have the described problem with BCM / ISOTP until this patch 
> 
> http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=0ae89beb283a0db5980d1d4781c7d7be2f2810d6
> 
> is applied by the stable kernel maintainers and distribution maintainers.
> The patch is already upstream for Linux 3.14 but it will take some time
> until it gets into the stable kernels 3.11 - 3.13 and the distributions.
> 
> As Linux 3.11 is already end-of-life [EOL] I'll address the Ubuntu and
> OpenSuse maintainers directly so that this patch for 3.11 does not get lost.
> David Miller already queued this patch up for -stable
> Original post: http://marc.info/?l=linux-netdev&m=139107310226665&w=2

At least the Ubuntu maintainers usually pick up the stable patches, so
that they appear "automatically" in Ubuntu's stable. Good Work!

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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