On Wed, Sep 19, 2018 at 10:29 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > On Wed, Sep 19, 2018 at 9:18 AM, Michal Kubecek <mkubecek@xxxxxxx> wrote: >> On Mon, Sep 17, 2018 at 03:36:21PM +0200, Dmitry Vyukov wrote: >>> Hi, >>> >>> I am having some problem with upstream kernel and bpfilter. The >>> manifestation is that IPT_SO_GET_INFO on an ipv4 socket works, then >>> something (that I can't fully localize but can reproduce) happens and >>> then IPT_SO_GET_INFO starts permanently returning 256. >> ... >>> Now the litmus program always fails with: >>> >>> getsockopt(3, SOL_IP, 0x40 /* IP_??? */, >>> "filter\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., [84]) >>> = 256 >>> >>> I am currently on upstream commit >>> 28619527b8a712590c93d0a9e24b4425b9376a8c, my .config is attached. I >>> don't know what is bpfilter, I see it mentions some umh, if it >>> requires some additional setup I don't it, i.e. I don't install any >>> userspace modules/helpers. >> >> This looks similar to the fallback issue described here: >> >> https://bugzilla.suse.com/show_bug.cgi?id=1106751#c1 >> >> Unfortunately I didn't have time to look into it more closely yet. > > +Takashi > > But I already have CONFIG_BPFILTER_UMH=y in my config, so it does not > help completely. > Also in my case it is working initially, but breaks after I run the > second program. I've disabled CONFIG_BPFILTER for now, it causes too many failures. https://github.com/google/syzkaller/commit/19a403430d8d5ae2472e16dab2f26ddd899cf552
