Re: net: heap out-of-bounds in fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone

[David Ahern]

On 3/7/17 1:43 AM, Dmitry Vyukov wrote:
> This is on c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201. No other kernel
> output from your patch (pr_err).

Is the below supposed to be from the same qemu instance at the time of
the crash? cpu1 and cpu2 are both supposedly doing a route insert?


> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 30179 at net/ipv6/ip6_fib.c:158
> rt6_rcu_free+0x61/0x70 net/ipv6/ip6_fib.c:158
> Kernel panic - not syncing: panic_on_warn set ...
> 
> CPU: 1 PID: 30179 Comm: syz-executor3 Not tainted 4.11.0-rc1+ #310
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:16 [inline]
>  dump_stack+0x2fb/0x3fd lib/dump_stack.c:52
>  panic+0x20f/0x426 kernel/panic.c:180
>  __warn+0x1c4/0x1e0 kernel/panic.c:541
>  warn_slowpath_null+0x2c/0x40 kernel/panic.c:584
>  rt6_rcu_free+0x61/0x70 net/ipv6/ip6_fib.c:158
>  rt6_release+0x1ee/0x290 net/ipv6/ip6_fib.c:189
>  fib6_add_rt2node net/ipv6/ip6_fib.c:922 [inline]
>  fib6_add+0x1d51/0x3290 net/ipv6/ip6_fib.c:1081
>  __ip6_ins_rt+0x60/0x80 net/ipv6/route.c:948
>  ip6_route_add+0x1a7/0x310 net/ipv6/route.c:2130
>  inet6_rtm_newroute+0x191/0x1b0 net/ipv6/route.c:3294
>  rtnetlink_rcv_msg+0x609/0x860 net/core/rtnetlink.c:4104
>  netlink_rcv_skb+0x2ab/0x390 net/netlink/af_netlink.c:2298
>  rtnetlink_rcv+0x2a/0x40 net/core/rtnetlink.c:4110
>  netlink_unicast_kernel net/netlink/af_netlink.c:1231 [inline]
>  netlink_unicast+0x525/0x730 net/netlink/af_netlink.c:1257
>  netlink_sendmsg+0xab3/0xe70 net/netlink/af_netlink.c:1803
>  sock_sendmsg_nosec net/socket.c:633 [inline]
>  sock_sendmsg+0xca/0x110 net/socket.c:643
>  sock_write_iter+0x326/0x600 net/socket.c:846
>  call_write_iter include/linux/fs.h:1733 [inline]
>  do_iter_readv_writev fs/read_write.c:696 [inline]
>  __do_readv_writev+0xbbc/0x10a0 fs/read_write.c:862
>  do_readv_writev+0x13f/0x200 fs/read_write.c:894
>  vfs_writev+0x87/0xc0 fs/read_write.c:921
>  do_writev+0x110/0x2c0 fs/read_write.c:954
>  SYSC_writev fs/read_write.c:1027 [inline]
>  SyS_writev+0x27/0x30 fs/read_write.c:1024
>  entry_SYSCALL_64_fastpath+0x1f/0xc2
> RIP: 0033:0x4458d9
> RSP: 002b:00007f31fcf33b58 EFLAGS: 00000292 ORIG_RAX: 0000000000000014
> RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004458d9
> RDX: 0000000000000001 RSI: 00000000207cd000 RDI: 0000000000000005
> RBP: 00000000006e30c0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000708000
> R13: 0000000020fad000 R14: 0000000000001000 R15: 0000000000000003
> 
> 
> 
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 31175 at net/ipv6/ip6_fib.c:158
> rt6_rcu_free+0x61/0x70 net/ipv6/ip6_fib.c:158
> Kernel panic - not syncing: panic_on_warn set ...
> 
> CPU: 2 PID: 31175 Comm: syz-executor1 Not tainted 4.11.0-rc1+ #310
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:16 [inline]
>  dump_stack+0x2fb/0x3fd lib/dump_stack.c:52
>  panic+0x20f/0x426 kernel/panic.c:180
>  __warn+0x1c4/0x1e0 kernel/panic.c:541
>  warn_slowpath_null+0x2c/0x40 kernel/panic.c:584
>  rt6_rcu_free+0x61/0x70 net/ipv6/ip6_fib.c:158
>  rt6_release+0x1ee/0x290 net/ipv6/ip6_fib.c:189
>  fib6_add_rt2node net/ipv6/ip6_fib.c:922 [inline]
>  fib6_add+0x1d51/0x3290 net/ipv6/ip6_fib.c:1081
> kvm_vm_ioctl_deassign_device: device hasn't been assigned before, so
> cannot be deassigned
>  __ip6_ins_rt+0x60/0x80 net/ipv6/route.c:948
>  ip6_route_add+0x1a7/0x310 net/ipv6/route.c:2130
>  inet6_rtm_newroute+0x191/0x1b0 net/ipv6/route.c:3294
>  rtnetlink_rcv_msg+0x609/0x860 net/core/rtnetlink.c:4104
>  netlink_rcv_skb+0x2ab/0x390 net/netlink/af_netlink.c:2298
>  rtnetlink_rcv+0x2a/0x40 net/core/rtnetlink.c:4110
>  netlink_unicast_kernel net/netlink/af_netlink.c:1231 [inline]
>  netlink_unicast+0x525/0x730 net/netlink/af_netlink.c:1257
>  netlink_sendmsg+0xab3/0xe70 net/netlink/af_netlink.c:1803
>  sock_sendmsg_nosec net/socket.c:633 [inline]
>  sock_sendmsg+0xca/0x110 net/socket.c:643
>  sock_write_iter+0x326/0x600 net/socket.c:846
>  call_write_iter include/linux/fs.h:1733 [inline]
>  do_iter_readv_writev fs/read_write.c:696 [inline]
>  __do_readv_writev+0xbbc/0x10a0 fs/read_write.c:862
>  do_readv_writev+0x13f/0x200 fs/read_write.c:894
>  vfs_writev+0x87/0xc0 fs/read_write.c:921
>  do_writev+0x110/0x2c0 fs/read_write.c:954
>  SYSC_writev fs/read_write.c:1027 [inline]
>  SyS_writev+0x27/0x30 fs/read_write.c:1024
>  entry_SYSCALL_64_fastpath+0x1f/0xc2
> RIP: 0033:0x4458d9
> RSP: 002b:00007f1639006b58 EFLAGS: 00000292 ORIG_RAX: 0000000000000014
> RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00000000004458d9
> RDX: 0000000000000001 RSI: 00000000207cd000 RDI: 0000000000000019
> RBP: 00000000006e30c0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000708000
> R13: 0000000000000010 R14: 0000000000000003 R15: 0000000000000000
>