> -----Original Message----- > From: David Miller [mailto:da...@davemloft.net] > Sent: Thursday, May 03, 2018 15:22 > To: syzbot+df0257c92ffd4fcc5...@syzkaller.appspotmail.com > Cc: Jon Maloy <jon.ma...@ericsson.com>; linux-kernel@vger.kernel.org; > net...@vger.kernel.org; syzkaller-b...@googlegroups.com; tipc- > discuss...@lists.sourceforge.net; ying....@windriver.com > Subject: Re: KMSAN: uninit-value in strcmp > > From: syzbot <syzbot+df0257c92ffd4fcc5...@syzkaller.appspotmail.com> > Date: Thu, 03 May 2018 11:44:02 -0700 > > > Call Trace: > > __dump_stack lib/dump_stack.c:17 [inline] > > dump_stack+0x185/0x1d0 lib/dump_stack.c:53 > > kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 > > __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 > > strcmp+0xf7/0x160 lib/string.c:329 > > tipc_nl_node_get_link+0x220/0x6f0 net/tipc/node.c:1881 > > genl_family_rcv_msg net/netlink/genetlink.c:599 [inline] > > Hmmm, TIPC_NL_LINK_GET uses tipc_nl_policy, which has a proper nesting > entry for TIPC_NLA_LINK. I wonder how the code goes about validating > TIPC_NLA_LINK_NAME in such a case? Does it?
I assume that a strncmp() instead of a strcmp() would avert this particular crash, but it doesn't sound like that is what you are after here? To be honest, I will need to study this code a little myself to understand if there is more that has to be done. ///jon > > This may be the problem.
