The bug still looks like reproducible after applying the patch [ https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=2c87d63ac853550e734edfd45e1be5e5aa44fbcc ]
2017-08-15 11:33 GMT+08:00 Eric Dumazet <eric.duma...@gmail.com>: > On Tue, 2017-08-15 at 10:49 +0800, idaifish wrote: >> Syzkaller hit 'general protection fault in fib_dump_info' bug on >> commit 4.13-rc5.. >> >> Guilty file: net/ipv4/fib_semantics.c >> >> kasan: GPF could be caused by NULL-ptr deref or user memory access >> general protection fault: 0000 [#1] SMP KASAN >> Modules linked in: >> CPU: 0 PID: 2808 Comm: syz-executor0 Not tainted 4.13.0-rc5 #1 >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS >> Ubuntu-1.8.2-1ubuntu1 04/01/2014 >> task: ffff880078562700 task.stack: ffff880078110000 >> RIP: 0010:fib_dump_info+0x388/0x1170 net/ipv4/fib_semantics.c:1314 >> RSP: 0018:ffff880078117010 EFLAGS: 00010206 >> RAX: dffffc0000000000 RBX: 00000000000000fe RCX: 0000000000000002 >> RDX: 0000000000000006 RSI: ffff880078117084 RDI: 0000000000000030 >> RBP: ffff880078117268 R08: 000000000000000c R09: ffff8800780d80c8 >> R10: 0000000058d629b4 R11: 0000000067fce681 R12: 0000000000000000 >> R13: ffff8800784bd540 R14: ffff8800780d80b5 R15: ffff8800780d80a4 >> FS: 00000000022fa940(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 00000000004387d0 CR3: 0000000079135000 CR4: 00000000000006f0 >> Call Trace: >> inet_rtm_getroute+0xc89/0x1f50 net/ipv4/route.c:2766 >> rtnetlink_rcv_msg+0x288/0x680 net/core/rtnetlink.c:4217 >> netlink_rcv_skb+0x340/0x470 net/netlink/af_netlink.c:2397 >> rtnetlink_rcv+0x28/0x30 net/core/rtnetlink.c:4223 >> netlink_unicast_kernel net/netlink/af_netlink.c:1265 [inline] >> netlink_unicast+0x4c4/0x6e0 net/netlink/af_netlink.c:1291 >> netlink_sendmsg+0x8c4/0xca0 net/netlink/af_netlink.c:1854 >> sock_sendmsg_nosec net/socket.c:633 [inline] >> sock_sendmsg+0xca/0x110 net/socket.c:643 >> ___sys_sendmsg+0x779/0x8d0 net/socket.c:2035 >> __sys_sendmsg+0xd1/0x170 net/socket.c:2069 >> SYSC_sendmsg net/socket.c:2080 [inline] >> SyS_sendmsg+0x2d/0x50 net/socket.c:2076 >> entry_SYSCALL_64_fastpath+0x1a/0xa5 >> RIP: 0033:0x4512e9 >> RSP: 002b:00007ffc75584cc8 EFLAGS: 00000216 ORIG_RAX: 000000000000002e >> RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004512e9 >> RDX: 0000000000000000 RSI: 0000000020f2cfc8 RDI: 0000000000000003 >> RBP: 000000000000000e R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000216 R12: fffffffffffffffe >> R13: 0000000000718000 R14: 0000000020c44ff0 R15: 0000000000000000 >> Code: 00 0f b6 8d ec fd ff ff 48 8b 85 f0 fd ff ff 88 48 17 48 8b 45 >> 28 48 8d 78 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> >> b6 04 02 84 c0 74 08 3c 03 0f 8e cb 0c 00 00 48 8b 45 28 44 >> RIP: fib_dump_info+0x388/0x1170 net/ipv4/fib_semantics.c:1314 RSP: >> ffff880078117010 >> ---[ end trace 254a7af28348f88b ]--- >> Kernel panic - not syncing: Fatal exception >> Kernel Offset: disabled >> Rebooting in 86400 seconds.. >> >> --------------------- >> >> .config and reproducer.prog are attached. Unfortunately the extracted >> C program can't work. >> Maybe you can follow the instruction >> [https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md] >> to reproduce the bug. >> >> > > Probably fixed by commit 2c87d63ac853550e734edfd45e1be5e5aa44fbcc > ("ipv4: route: fix inet_rtm_getroute induced crash") > (In David Miller net tree) > > -- Regards, idaifish
