Toke, Jesper, please take a look. Seems to be in your area of expertise. Thanks On Fri, Jan 7, 2022 at 6:19 AM syzbot <syzbot+983941aa85af6ded1fd9@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 819d11507f66 bpf, selftests: Fix spelling mistake "tained".. > git tree: bpf > console output: https://syzkaller.appspot.com/x/log.txt?x=12500db3b00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=22b66456935ee10 > dashboard link: https://syzkaller.appspot.com/bug?extid=983941aa85af6ded1fd9 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153a6cb3b00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=121c690bb00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+983941aa85af6ded1fd9@xxxxxxxxxxxxxxxxxxxxxxxxx > > general protection fault, probably for non-canonical address 0xdffffc000000003e: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x00000000000001f0-0x00000000000001f7] > CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:dev_index_hash net/core/dev.c:222 [inline] > RIP: 0010:dev_get_by_index_rcu+0x28/0x140 net/core/dev.c:885 > Code: 00 00 41 55 41 54 55 89 f5 53 48 89 fb e8 00 9d 4d fa 48 8d bb f0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fc 00 00 00 48 8b 93 f0 01 00 00 40 0f b6 c5 48 > RSP: 0018:ffffc90000d97608 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 > RDX: 000000000000003e RSI: ffffffff872a14d0 RDI: 00000000000001f0 > RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 > R10: ffffffff873745ad R11: 000000000008808a R12: ffff88806a062100 > R13: 0000000000000003 R14: ffff88806a062100 R15: ffffc90001116000 > FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055555733a848 CR3: 000000001479e000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > ____bpf_clone_redirect net/core/filter.c:2410 [inline] > bpf_clone_redirect+0x91/0x420 net/core/filter.c:2401 > bpf_prog_bebbfe2050753572+0x56/0xcc0 > __bpf_prog_run include/linux/filter.h:626 [inline] > bpf_prog_run_xdp include/linux/filter.h:801 [inline] > veth_xdp_rcv_skb+0x64b/0x1b20 drivers/net/veth.c:775 > veth_xdp_rcv+0x3ac/0x810 drivers/net/veth.c:881 > veth_poll+0x134/0x850 drivers/net/veth.c:913 > __napi_poll+0xaf/0x440 net/core/dev.c:7023 > napi_poll net/core/dev.c:7090 [inline] > net_rx_action+0x801/0xb40 net/core/dev.c:7177 > __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 > run_ksoftirqd kernel/softirq.c:921 [inline] > run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913 > smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 > kthread+0x405/0x4f0 kernel/kthread.c:327 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > </TASK> > Modules linked in: > ---[ end trace 86b7d5782a67ad32 ]--- > RIP: 0010:dev_index_hash net/core/dev.c:222 [inline] > RIP: 0010:dev_get_by_index_rcu+0x28/0x140 net/core/dev.c:885 > Code: 00 00 41 55 41 54 55 89 f5 53 48 89 fb e8 00 9d 4d fa 48 8d bb f0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fc 00 00 00 48 8b 93 f0 01 00 00 40 0f b6 c5 48 > RSP: 0018:ffffc90000d97608 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 > RDX: 000000000000003e RSI: ffffffff872a14d0 RDI: 00000000000001f0 > RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 > R10: ffffffff873745ad R11: 000000000008808a R12: ffff88806a062100 > R13: 0000000000000003 R14: ffff88806a062100 R15: ffffc90001116000 > FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055555733a848 CR3: 000000001479e000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 00 00 add %al,(%rax) > 2: 41 55 push %r13 > 4: 41 54 push %r12 > 6: 55 push %rbp > 7: 89 f5 mov %esi,%ebp > 9: 53 push %rbx > a: 48 89 fb mov %rdi,%rbx > d: e8 00 9d 4d fa callq 0xfa4d9d12 > 12: 48 8d bb f0 01 00 00 lea 0x1f0(%rbx),%rdi > 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 20: fc ff df > 23: 48 89 fa mov %rdi,%rdx > 26: 48 c1 ea 03 shr $0x3,%rdx > * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2e: 0f 85 fc 00 00 00 jne 0x130 > 34: 48 8b 93 f0 01 00 00 mov 0x1f0(%rbx),%rdx > 3b: 40 0f b6 c5 movzbl %bpl,%eax > 3f: 48 rex.W > > > --- > This report 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches
