Messages in this thread | | | From | Dmitry Vyukov <> | Date | Fri, 15 Jun 2018 09:31:43 +0200 | Subject | Re: KMSAN: uninit-value in xfrm_state_find |
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On Fri, Jun 15, 2018 at 9:30 AM, syzbot <syzbot+131cd4c6d21724b99a26@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 1df165c8d2d6 kmsan: introduce kmsan_clear_user_page() > git tree: https://github.com/google/kmsan.git/master > console output: https://syzkaller.appspot.com/x/log.txt?x=15336e97800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4ca1e57bafa8ab1f > dashboard link: https://syzkaller.appspot.com/bug?extid=131cd4c6d21724b99a26 > compiler: clang version 7.0.0 (trunk 329391) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=12c7a417800000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13710197800000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+131cd4c6d21724b99a26@syzkaller.appspotmail.com
This may be related to "BUG: KASAN: stack-out-of-bounds in ipv6_addr_equal include/net/ipv6.h": https://groups.google.com/d/msg/syzkaller/va_9cjZsHQE/Htc7sYY2BwAJ
> IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready > IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready > IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready > 8021q: adding VLAN 0 to HW filter on device team0 > ================================================================== > BUG: KMSAN: uninit-value in __arch_swab32 > arch/x86/include/uapi/asm/swab.h:10 [inline] > BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:59 [inline] > BUG: KMSAN: uninit-value in __xfrm6_daddr_saddr_hash net/xfrm/xfrm_hash.h:29 > [inline] > BUG: KMSAN: uninit-value in __xfrm_dst_hash net/xfrm/xfrm_hash.h:96 [inline] > BUG: KMSAN: uninit-value in xfrm_dst_hash net/xfrm/xfrm_state.c:60 [inline] > BUG: KMSAN: uninit-value in xfrm_state_find+0x2b15/0x4f40 > net/xfrm/xfrm_state.c:952 > CPU: 0 PID: 4464 Comm: syz-executor988 Not tainted 4.17.0-rc3+ #93 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x185/0x1d0 lib/dump_stack.c:113 > kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1084 > __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 > __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline] > __fswab32 include/uapi/linux/swab.h:59 [inline] > __xfrm6_daddr_saddr_hash net/xfrm/xfrm_hash.h:29 [inline] > __xfrm_dst_hash net/xfrm/xfrm_hash.h:96 [inline] > xfrm_dst_hash net/xfrm/xfrm_state.c:60 [inline] > xfrm_state_find+0x2b15/0x4f40 net/xfrm/xfrm_state.c:952 > xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1393 [inline] > xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:1437 [inline] > xfrm_resolve_and_create_bundle+0xc31/0x5270 net/xfrm/xfrm_policy.c:1833 > xfrm_lookup+0x606/0x39d0 net/xfrm/xfrm_policy.c:2163 > xfrm_lookup_route+0xfa/0x360 net/xfrm/xfrm_policy.c:2283 > ip_route_output_flow+0x35b/0x3b0 net/ipv4/route.c:2574 > udp_sendmsg+0x2289/0x33f0 net/ipv4/udp.c:1006 > udpv6_sendmsg+0x1291/0x3f40 net/ipv6/udp.c:1175 > inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:798 > sock_sendmsg_nosec net/socket.c:629 [inline] > sock_sendmsg net/socket.c:639 [inline] > ___sys_sendmsg+0xec0/0x1310 net/socket.c:2117 > __sys_sendmmsg+0x490/0x850 net/socket.c:2212 > __do_sys_sendmmsg net/socket.c:2241 [inline] > __se_sys_sendmmsg net/socket.c:2238 [inline] > __x64_sys_sendmmsg+0x11c/0x170 net/socket.c:2238 > do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > RIP: 0033:0x4419c9 > RSP: 002b:00007ffdb3fa4608 EFLAGS: 00000217 ORIG_RAX: 0000000000000133 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004419c9 > RDX: 0000000000000001 RSI: 0000000020002000 RDI: 0000000000000003 > RBP: 00000000006cd018 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004026c0 > R13: 0000000000402750 R14: 0000000000000000 R15: 0000000000000000 > > Local variable description: ----fl4_stack@udp_sendmsg > Variable was created at: > udp_sendmsg+0xe5/0x33f0 net/ipv4/udp.c:841 > udpv6_sendmsg+0x1291/0x3f40 net/ipv6/udp.c:1175 > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches
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