On Thu, Apr 13, 2017 at 9:59 PM, Cong Wang <xiyou.wangc...@gmail.com> wrote: > On Thu, Apr 13, 2017 at 11:49 AM, Andrey Konovalov > <andreyk...@google.com> wrote: >> On Mon, Apr 10, 2017 at 7:46 PM, Andrey Konovalov <andreyk...@google.com> >> wrote: >>> On Mon, Apr 10, 2017 at 7:42 PM, Cong Wang <xiyou.wangc...@gmail.com> wrote: >>>> On Mon, Apr 10, 2017 at 7:40 AM, Andrey Konovalov <andreyk...@google.com> >>>> wrote: >>>>> Hi, >>>>> >>>>> I've got the following error report while fuzzing the kernel with >>>>> syzkaller. >>>>> >>>>> On commit 39da7c509acff13fc8cb12ec1bb20337c988ed36 (4.11-rc6). >>>>> >>>>> Unfortunately it's not reproducible. >>>>> >>>>> BUG: KASAN: use-after-free in ip_select_ttl include/net/dst.h:176 >>>>> [inline] at addr ffff88006ab3602c >>>>> BUG: KASAN: use-after-free in ip_queue_xmit+0x1817/0x1a30 >>>>> net/ipv4/ip_output.c:485 at addr ffff88006ab3602c >>>>> Read of size 4 by task syz-executor1/12627 >>>>> CPU: 3 PID: 12627 Comm: syz-executor1 Not tainted 4.11.0-rc6+ #206 >>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs >>>>> 01/01/2011 >>>>> Call Trace: >>>>> __dump_stack lib/dump_stack.c:16 [inline] >>>>> dump_stack+0x292/0x398 lib/dump_stack.c:52 >>>>> kasan_object_err+0x1c/0x70 mm/kasan/report.c:164 >>>>> print_address_description mm/kasan/report.c:202 [inline] >>>>> kasan_report_error mm/kasan/report.c:291 [inline] >>>>> kasan_report+0x252/0x510 mm/kasan/report.c:347 >>>>> __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:367 >>>>> ip_select_ttl include/net/dst.h:176 [inline] >>>> >>>> Probably same as the one you reported on ipv4_mtu(), it would >>>> be nice if you could test the patch I proposed: >>>> >>>> https://patchwork.ozlabs.org/patch/747556/ >>> >>> Applied your patch. >> >> Oops, apparently your patch doesn't compile: >> > > Weird, it compiles fine here. Either you have a different config > or the following piece is missing for some reason? > > @@ -69,6 +69,7 @@ struct rtable { > > struct list_head rt_uncached; > struct uncached_list *rt_uncached_list; > + struct fib_info *fi; /* for refcnt to shared metrics */ > };
Yes, I don't have this field in the rtable struct. I'm on 39da7c509acff13fc8cb12ec1bb20337c988ed36 (4.11-rc6). I also don't see it in the cross reference: http://lxr.free-electrons.com/source/include/net/route.h#L51 > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout.
