From: Andrey Ryabinin <aryabi...@virtuozzo.com> Date: Wed, 18 May 2016 19:19:27 +0300
> ->sk_shutdown bits share one bitfield with some other bits in sock struct, > such as ->sk_no_check_[r,t]x, ->sk_userlocks ... > sock_setsockopt() may write to these bits, while holding the socket lock. > > In case of AF_UNIX sockets, we change ->sk_shutdown bits while holding only > unix_state_lock(). So concurrent setsockopt() and shutdown() may lead > to corrupting these bits. > > Fix this by moving ->sk_shutdown bits out of bitfield into a separate byte. > This will not change the 'struct sock' size since ->sk_shutdown moved into > previously unused 16-bit hole. > > Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com> > Suggested-by: Hannes Frederic Sowa <han...@stressinduktion.org> Looks good, applied and queued up for -stable. Thanks.
