From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: Re: KMSAN: uninit-value in can_receive Date: Tue, 26 Nov 2019 01:00:07 -0800 Message-ID: <00000000000055558105983c1b38@google.com> References: <0000000000005c08d10597a3a05d@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Return-path: In-Reply-To: <0000000000005c08d10597a3a05d@google.com> Sender: netdev-owner@vger.kernel.org To: davem@davemloft.net, dvyukov@google.com, eric.dumazet@gmail.com, glider@google.com, linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, mkl@pengutronix.de, netdev@vger.kernel.org, o.rempel@pengutronix.de, socketcan@hartkopp.net, syzkaller-bugs@googlegroups.com List-Id: linux-can.vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 4a1d41e3 net: kasan: kmsan: support CONFIG_GENERIC_CSUM on.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1632f75ae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=fde150fb1e865232 dashboard link: https://syzkaller.appspot.com/bug?extid=b02ff0707a97e4e79ebb compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15696e36e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132b3636e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b02ff0707a97e4e79ebb@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in can_receive+0x23c/0x5e0 net/can/af_can.c:650 CPU: 0 PID: 11833 Comm: syz-executor463 Not tainted 5.4.0-rc8-syzkaller #0 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+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x64/0xc0 mm/kmsan/kmsan_instr.c:245 can_receive+0x23c/0x5e0 net/can/af_can.c:650 canfd_rcv+0x188/0x3a0 net/can/af_can.c:703 __netif_receive_skb_one_core net/core/dev.c:4929 [inline] __netif_receive_skb net/core/dev.c:5043 [inline] process_backlog+0x12a6/0x13c0 net/core/dev.c:5874 napi_poll net/core/dev.c:6311 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6379 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1091 do_softirq kernel/softirq.c:338 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] __dev_queue_xmit+0x38e8/0x4200 net/core/dev.c:3819 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3825 packet_snd net/packet/af_packet.c:2959 [inline] packet_sendmsg+0x8234/0x9100 net/packet/af_packet.c:2984 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmmsg+0x53a/0xae0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2439 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2439 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x442129 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffef5083a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442129 RDX: 000000000400004e RSI: 0000000020000d00 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000025 R09: 0000000000000025 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004036a0 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:149 [inline] kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:132 kmsan_slab_alloc+0x97/0x100 mm/kmsan/kmsan_hooks.c:86 slab_alloc_node mm/slub.c:2773 [inline] __kmalloc_node_track_caller+0xe27/0x11a0 mm/slub.c:4381 __kmalloc_reserve net/core/skbuff.c:141 [inline] __alloc_skb+0x306/0xa10 net/core/skbuff.c:209 alloc_skb include/linux/skbuff.h:1049 [inline] alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5662 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2244 packet_alloc_skb net/packet/af_packet.c:2807 [inline] packet_snd net/packet/af_packet.c:2902 [inline] packet_sendmsg+0x63a6/0x9100 net/packet/af_packet.c:2984 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmmsg+0x53a/0xae0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2439 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2439 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================