Messages in this thread | | | From | Palash Oswal <> | Date | Thu, 13 Apr 2023 20:35:52 -0700 | Subject | kernel BUG in fou_build_udp |
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Hello, I found the following issue using syzkaller with enriched corpus on: HEAD commit : 0bcc4025550403ae28d2984bddacafbca0a2f112 git tree: linux
C Reproducer : https://gist.github.com/oswalpalash/2a4bdb639c605ec80dbeec220e09603c Kernel .config : https://gist.github.com/oswalpalash/d9580b0bfce202b37445fa5fd426e41f syz-repro : r0 = socket$inet6(0xa, 0x2, 0x0) r1 = socket$nl_route(0x10, 0x3, 0x0) r2 = socket(0x10, 0x803, 0x0) sendmsg$nl_route(r2, &(0x7f0000000380)={0x0, 0x0, &(0x7f0000000340)={0x0, 0x14}}, 0x0) getsockname$packet(r2, &(0x7f0000000100)={0x11, 0x0, <r3=>0x0, 0x1, 0x0, 0x6, @broadcast}, &(0x7f00000000c0)=0x14) sendmsg$nl_route(r1, &(0x7f0000000080)={0x0, 0x0, &(0x7f0000000500)={&(0x7f0000000180)=@newlink={0x60, 0x10, 0x439, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x9801}, [@IFLA_LINKINFO={0x40, 0x12, 0x0, 0x1, @sit={{0x8}, {0x34, 0x2, 0x0, 0x1, [@IFLA_IPTUN_LINK={0x8, 0x1, r3}, @IFLA_IPTUN_ENCAP_TYPE={0x6, 0xf, 0x2}, @IFLA_IPTUN_ENCAP_SPORT={0x6, 0x11, 0x4e21}, @IFLA_IPTUN_ENCAP_SPORT={0x6, 0x11, 0x4e24}, @IFLA_IPTUN_LOCAL={0x8, 0x2, @dev={0xac, 0x14, 0x14, 0x16}}, @IFLA_IPTUN_ENCAP_FLAGS={0x6, 0x10, 0xfff}]}}}]}, 0x60}}, 0x20048894) sendmmsg$inet(r0, &(0x7f00000017c0)=[{{&(0x7f0000000040)={0x2, 0x4e20, @multicast1}, 0x10, 0x0, 0x0, &(0x7f0000000000)=[@ip_pktinfo={{0x1c, 0x0, 0x8, {r3, @empty, @remote}}}], 0x20}}], 0x1, 0x0)
Console log:
skbuff: skb_under_panic: text:ffffffff88a09da0 len:48 put:8 head:ffff88801e4be680 data:ffff88801e4be67c tail:0x2c end:0x140 dev:sit1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:150! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 10068 Comm: syz-executor.3 Not tainted 6.3.0-rc6-pasta-00035-g0bcc40255504 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:skb_panic+0x152/0x1d0 Code: 0f b6 04 01 84 c0 74 04 3c 03 7e 20 8b 4b 70 41 56 45 89 e8 48 c7 c7 80 b3 5b 8b 41 57 56 48 89 ee 52 4c 89 e2 e8 ae 15 6c f9 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 69 1f d8 f9 4c RSP: 0018:ffffc900029bead0 EFLAGS: 00010282 RAX: 0000000000000084 RBX: ffff88801d1c3d00 RCX: ffffc9000d863000 RDX: 0000000000000000 RSI: ffffffff816695cc RDI: 0000000000000005 RBP: ffffffff8b5bc1e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000000 R12: ffffffff88a09da0 R13: 0000000000000008 R14: ffff8880306b8000 R15: 0000000000000140 FS: 00007f1dae5ed700(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564f403b7d10 CR3: 0000000117f1c000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> skb_push+0xc8/0xe0 fou_build_udp+0x30/0x370 gue_build_header+0xfb/0x150 ip_tunnel_xmit+0x66e/0x3150 sit_tunnel_xmit__.isra.0+0xe7/0x150 sit_tunnel_xmit+0xf7e/0x28e0 dev_hard_start_xmit+0x187/0x700 __dev_queue_xmit+0x2ce4/0x3c40 neigh_connected_output+0x3c2/0x550 ip_finish_output2+0x78a/0x22e0 __ip_finish_output+0x396/0x650 ip_finish_output+0x31/0x280 ip_mc_output+0x21f/0x710 ip_send_skb+0xd8/0x260 udp_send_skb+0x73a/0x1480 udp_sendmsg+0x1bb2/0x2840 udpv6_sendmsg+0x1710/0x2c20 inet6_sendmsg+0x9d/0xe0 sock_sendmsg+0xde/0x190 ____sys_sendmsg+0x334/0x900 ___sys_sendmsg+0x110/0x1b0 __sys_sendmmsg+0x18f/0x460 __x64_sys_sendmmsg+0x9d/0x100 do_syscall_64+0x39/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f1dad88eacd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1dae5ecbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f1dad9bbf80 RCX: 00007f1dad88eacd RDX: 0000000000000001 RSI: 00000000200017c0 RDI: 0000000000000003 RBP: 00007f1dad8fcb05 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4922802f R14: 00007fff492281d0 R15: 00007f1dae5ecd80 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x152/0x1d0 Code: 0f b6 04 01 84 c0 74 04 3c 03 7e 20 8b 4b 70 41 56 45 89 e8 48 c7 c7 80 b3 5b 8b 41 57 56 48 89 ee 52 4c 89 e2 e8 ae 15 6c f9 <0f> 0b 4c 89 4c 24 10 48 89 54 24 08 48 89 34 24 e8 69 1f d8 f9 4c RSP: 0018:ffffc900029bead0 EFLAGS: 00010282 RAX: 0000000000000084 RBX: ffff88801d1c3d00 RCX: ffffc9000d863000 RDX: 0000000000000000 RSI: ffffffff816695cc RDI: 0000000000000005 RBP: ffffffff8b5bc1e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000000 R12: ffffffff88a09da0 R13: 0000000000000008 R14: ffff8880306b8000 R15: 0000000000000140 FS: 00007f1dae5ed700(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564f403b7d10 CR3: 0000000117f1c000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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