On Fri, May 19, 2017 at 5:57 AM, Andrey Konovalov <andreyk...@google.com> wrote: > On Fri, May 19, 2017 at 12:18 PM, <idaif...@gmail.com> wrote: >> Hi, >> >> I've got the following bug report while fuzzing the >> kernel(master-f83246089ca) with syzkaller. >> >> program and config are attached. > > Hi! > > Thanks for the report! > > Adding kernel maintainers. > > I can confirm that we've hist this bug multiple times, but never been > able to reproduce it. > > I was able to reproduce it on 2ea659a9ef488125eb46da6eb571de5eae5c43f6 > (4.12-rc1). > > Using the attached syzkaller program I was able to generate C > reproducer, attached. Sometimes I need to run it a few times to > trigger the bug. > > @idaifish If you find more bugs please run ./scripts/get_maintainer.pl > to get the list of subsystem maintainers and add them to the > recipients. I've updated instructions of how to report kernel bugs > found with syzkaller in README. > > Thanks! > >> >> ======================================================= >> kasan: GPF could be caused by NULL-ptr deref or user memory access >> general protection fault: 0000 [#1] SMP KASAN >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Modules linked in: >> CPU: 2 PID: 21599 Comm: syz-executor3 Not tainted 4.11.0-rc8+ #1 >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS >> Ubuntu-1.8.2-1ubuntu1 04/01/2014 >> task: ffff88006c16dec0 task.stack: ffff880058bb8000 >> RIP: 0010:__read_once_size include/linux/compiler.h:254 [inline] >> RIP: 0010:compound_head include/linux/page-flags.h:146 [inline] >> RIP: 0010:put_page include/linux/mm.h:796 [inline] >> RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2613 [inline] >> RIP: 0010:skb_release_data+0x201/0x3b0 net/core/skbuff.c:593 >> RSP: 0018:ffff880058bbf570 EFLAGS: 00010a02 >> RAX: 11032b488bad1523 RBX: ffff88006c6e8ec8 RCX: ffffc9000190e000 >> RDX: 1ffff1000d8dd1df RSI: ffffffff8293d7e3 RDI: 88195a445d68a919 >> RBP: ffff880058bbf5a8 R08: 7bdf27567b31597f R09: 0000000000000000 >> R10: 00000000000000d2 R11: 7dc9ab6dec891f24 R12: 0000000000000000 >> R13: dffffc0000000000 R14: ffff88006a475940 R15: 88195a445d68a8f9 >> FS: 00007fbbc6a34700(0000) GS:ffff88006e400000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000000002004e000 CR3: 000000006b868000 CR4: 00000000000006e0 >> Call Trace: >> skb_release_all+0x4a/0x60 net/core/skbuff.c:669 >> __kfree_skb net/core/skbuff.c:683 [inline] >> kfree_skb+0x85/0x1b0 net/core/skbuff.c:704 >> __ip6_append_data.isra.42+0x26ed/0x33b0 net/ipv6/ip6_output.c:1519 >> ip6_append_data+0x1a8/0x2f0 net/ipv6/ip6_output.c:1633 >> udpv6_sendmsg+0x7bd/0x2360 net/ipv6/udp.c:1264 >> inet_sendmsg+0x123/0x3a0 net/ipv4/af_inet.c:762 >> sock_sendmsg_nosec net/socket.c:633 [inline] >> sock_sendmsg+0xca/0x110 net/socket.c:643 >> ___sys_sendmsg+0x79f/0x900 net/socket.c:1997 >> __sys_sendmsg+0xd1/0x170 net/socket.c:2031 >> SYSC_sendmsg net/socket.c:2042 [inline] >> SyS_sendmsg+0x2d/0x50 net/socket.c:2038 >> entry_SYSCALL_64_fastpath+0x1a/0xa9 >> RIP: 0033:0x44fb79 >> RSP: 002b:00007fbbc6a33b58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e >> RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000044fb79 >> RDX: 0000000000000000 RSI: 000000002000afc8 RDI: 0000000000000005 >> RBP: 00000000000003fb R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000005 >> R13: 0000000020001000 R14: 0000000000048000 R15: 0000000000000000 >> Code: 48 83 c0 03 48 c1 e0 04 48 01 d8 48 89 c2 48 c1 ea 03 42 80 3c 2a 00 >> 0f 85 92 01 00 00 4c 8b 38 49 8d 7f 20 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 >> 0f 85 6f 01 00 00 49 8b 47 20 a8 01 0f 84 3b ff >> RIP: __read_once_size include/linux/compiler.h:254 [inline] RSP: >> ffff880058bbf570 >> RIP: compound_head include/linux/page-flags.h:146 [inline] RSP: >> ffff880058bbf570 >> RIP: put_page include/linux/mm.h:796 [inline] RSP: ffff880058bbf570 >> RIP: __skb_frag_unref include/linux/skbuff.h:2613 [inline] RSP: >> ffff880058bbf570 >> RIP: skb_release_data+0x201/0x3b0 net/core/skbuff.c:593 RSP: >> ffff880058bbf570 >> ---[ end trace 46c9f72a66cd8627 ]--- >> Kernel panic - not syncing: Fatal exception >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Kernel Offset: disabled >> Rebooting in 86400 seconds.. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "syzkaller" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to syzkaller+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout.
Hi Andrey, please try following patch Thanks.
patch2482
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