Re: iwlagn: memory corruption with WPA enterprise

[Stanislaw Gruszka <sgruszka@redhat.com>]

On Mon, Mar 05, 2012 at 03:01:30PM +0100, Tomáš Janoušek wrote:
> > That make sense! Your "CPU instructions break things" theory sounds crazy,
> > but I think it's logical. WPA enterprise differ from WPA-PSA (pre shared
> > key) that the key changed periodically, SSL is used when keys are changed
> > (via wpa_supplicant). So looks like 32-bit openssl generate object code
> > that trigger bug on CPU, which crash other processes.
> 
> It seems that someone beat me to it. Since Linus fixed the FPU leaks in
> 3.3-rc4, I haven't experienced the problem. And I was this close! :-)

Yeh, that was really nasty bug. 

> Anyway, thanks for assistance and sorry for being so slow to respond.

No problem. Can you remind me, is this reproducible on 64-bit kernel
with 32-bit user space? I'm asking because I would like to know if we
need to  backport those fixes to our kernel. We do not enable
CONFIG_CRYPTO_AES_NI_INTEL on 32 bit kernel, only on 64 bit, but if this
problem happen with 32-bit user land with 64 bit kernel, we will need to
do backport.

Thanks
Stanislaw