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Eric Dumazet 31ea5bcc7d net/ipv6: avoid possible UAF in ip6_route_mpath_notify() 
[ Upstream commit 685f7d5312 ]

syzbot found another use-after-free in ip6_route_mpath_notify() [1]

Commit f7225172f2 ("net/ipv6: prevent use after free in
ip6_route_mpath_notify") was not able to fix the root cause.

We need to defer the fib6_info_release() calls after
ip6_route_mpath_notify(), in the cleanup phase.

[1]
BUG: KASAN: slab-use-after-free in rt6_fill_node+0x1460/0x1ac0
Read of size 4 at addr ffff88809a07fc64 by task syz-executor.2/23037

CPU: 0 PID: 23037 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-01035-gea7f3cfaa588 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
  __dump_stack lib/dump_stack.c:88 [inline]
  dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
  print_address_description mm/kasan/report.c:377 [inline]
  print_report+0x167/0x540 mm/kasan/report.c:488
  kasan_report+0x142/0x180 mm/kasan/report.c:601
 rt6_fill_node+0x1460/0x1ac0
  inet6_rt_notify+0x13b/0x290 net/ipv6/route.c:6184
  ip6_route_mpath_notify net/ipv6/route.c:5198 [inline]
  ip6_route_multipath_add net/ipv6/route.c:5404 [inline]
  inet6_rtm_newroute+0x1d0f/0x2300 net/ipv6/route.c:5517
  rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597
  netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543
  netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
  netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367
  netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908
  sock_sendmsg_nosec net/socket.c:730 [inline]
  __sock_sendmsg+0x221/0x270 net/socket.c:745
  ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
  ___sys_sendmsg net/socket.c:2638 [inline]
  __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f73dd87dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f73de6550c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f73dd9ac050 RCX: 00007f73dd87dda9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 00007f73dd8ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f73dd9ac050 R15: 00007ffdbdeb7858
 </TASK>

Allocated by task 23037:
  kasan_save_stack mm/kasan/common.c:47 [inline]
  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
  poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
  __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389
  kasan_kmalloc include/linux/kasan.h:211 [inline]
  __do_kmalloc_node mm/slub.c:3981 [inline]
  __kmalloc+0x22e/0x490 mm/slub.c:3994
  kmalloc include/linux/slab.h:594 [inline]
  kzalloc include/linux/slab.h:711 [inline]
  fib6_info_alloc+0x2e/0xf0 net/ipv6/ip6_fib.c:155
  ip6_route_info_create+0x445/0x12b0 net/ipv6/route.c:3758
  ip6_route_multipath_add net/ipv6/route.c:5298 [inline]
  inet6_rtm_newroute+0x744/0x2300 net/ipv6/route.c:5517
  rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597
  netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543
  netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
  netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367
  netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908
  sock_sendmsg_nosec net/socket.c:730 [inline]
  __sock_sendmsg+0x221/0x270 net/socket.c:745
  ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
  ___sys_sendmsg net/socket.c:2638 [inline]
  __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

Freed by task 16:
  kasan_save_stack mm/kasan/common.c:47 [inline]
  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
  kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640
  poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241
  __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257
  kasan_slab_free include/linux/kasan.h:184 [inline]
  slab_free_hook mm/slub.c:2121 [inline]
  slab_free mm/slub.c:4299 [inline]
  kfree+0x14a/0x380 mm/slub.c:4409
  rcu_do_batch kernel/rcu/tree.c:2190 [inline]
  rcu_core+0xd76/0x1810 kernel/rcu/tree.c:2465
  __do_softirq+0x2bb/0x942 kernel/softirq.c:553

Last potentially related work creation:
  kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
  __kasan_record_aux_stack+0xae/0x100 mm/kasan/generic.c:586
  __call_rcu_common kernel/rcu/tree.c:2715 [inline]
  call_rcu+0x167/0xa80 kernel/rcu/tree.c:2829
  fib6_info_release include/net/ip6_fib.h:341 [inline]
  ip6_route_multipath_add net/ipv6/route.c:5344 [inline]
  inet6_rtm_newroute+0x114d/0x2300 net/ipv6/route.c:5517
  rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6597
  netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543
  netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
  netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367
  netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908
  sock_sendmsg_nosec net/socket.c:730 [inline]
  __sock_sendmsg+0x221/0x270 net/socket.c:745
  ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
  ___sys_sendmsg net/socket.c:2638 [inline]
  __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

The buggy address belongs to the object at ffff88809a07fc00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 100 bytes inside of
 freed 512-byte region [ffff88809a07fc00, ffff88809a07fe00)

The buggy address belongs to the physical page:
page:ffffea0002681f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9a07c
head:ffffea0002681f00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888014c41c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 23028, tgid 23027 (syz-executor.4), ts 2340253595219, free_ts 2339107097036
  set_page_owner include/linux/page_owner.h:31 [inline]
  post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533
  prep_new_page mm/page_alloc.c:1540 [inline]
  get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311
  __alloc_pages+0x255/0x680 mm/page_alloc.c:4567
  __alloc_pages_node include/linux/gfp.h:238 [inline]
  alloc_pages_node include/linux/gfp.h:261 [inline]
  alloc_slab_page+0x5f/0x160 mm/slub.c:2190
  allocate_slab mm/slub.c:2354 [inline]
  new_slab+0x84/0x2f0 mm/slub.c:2407
  ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540
  __slab_alloc mm/slub.c:3625 [inline]
  __slab_alloc_node mm/slub.c:3678 [inline]
  slab_alloc_node mm/slub.c:3850 [inline]
  __do_kmalloc_node mm/slub.c:3980 [inline]
  __kmalloc+0x2e0/0x490 mm/slub.c:3994
  kmalloc include/linux/slab.h:594 [inline]
  kzalloc include/linux/slab.h:711 [inline]
  new_dir fs/proc/proc_sysctl.c:956 [inline]
  get_subdir fs/proc/proc_sysctl.c:1000 [inline]
  sysctl_mkdir_p fs/proc/proc_sysctl.c:1295 [inline]
  __register_sysctl_table+0xb30/0x1440 fs/proc/proc_sysctl.c:1376
  neigh_sysctl_register+0x416/0x500 net/core/neighbour.c:3859
  devinet_sysctl_register+0xaf/0x1f0 net/ipv4/devinet.c:2644
  inetdev_init+0x296/0x4d0 net/ipv4/devinet.c:286
  inetdev_event+0x338/0x15c0 net/ipv4/devinet.c:1555
  notifier_call_chain+0x18f/0x3b0 kernel/notifier.c:93
  call_netdevice_notifiers_extack net/core/dev.c:1987 [inline]
  call_netdevice_notifiers net/core/dev.c:2001 [inline]
  register_netdevice+0x15b2/0x1a20 net/core/dev.c:10340
  br_dev_newlink+0x27/0x100 net/bridge/br_netlink.c:1563
  rtnl_newlink_create net/core/rtnetlink.c:3497 [inline]
  __rtnl_newlink net/core/rtnetlink.c:3717 [inline]
  rtnl_newlink+0x158f/0x20a0 net/core/rtnetlink.c:3730
page last free pid 11583 tgid 11583 stack trace:
  reset_page_owner include/linux/page_owner.h:24 [inline]
  free_pages_prepare mm/page_alloc.c:1140 [inline]
  free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346
  free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486
  kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:415
  apply_to_pte_range mm/memory.c:2619 [inline]
  apply_to_pmd_range mm/memory.c:2663 [inline]
  apply_to_pud_range mm/memory.c:2699 [inline]
  apply_to_p4d_range mm/memory.c:2735 [inline]
  __apply_to_page_range+0x8ec/0xe40 mm/memory.c:2769
  kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:532
  __purge_vmap_area_lazy+0x163f/0x1a10 mm/vmalloc.c:1770
  drain_vmap_area_work+0x40/0xd0 mm/vmalloc.c:1804
  process_one_work kernel/workqueue.c:2633 [inline]
  process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
  worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
  kthread+0x2ef/0x390 kernel/kthread.c:388
  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
  ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242

Memory state around the buggy address:
 ffff88809a07fb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809a07fb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809a07fc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88809a07fc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809a07fd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

Fixes: 3b1137fe74 ("net: ipv6: Change notifications for multipath add to RTA_MULTIPATH")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240303144801.702646-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-03-15 10:48:14 -04:00
..
ila ila: do not generate empty messages in ila_xlat_nl_cmd_get_mapping() 2023-03-17 08:31:44 +01:00
netfilter treewide: Remove uninitialized_var() usage 2023-08-11 11:45:01 +02:00
addrconf.c net: ipv6/addrconf: avoid integer underflow in ipv6_create_tempaddr 2023-09-23 10:48:13 +02:00
addrconf_core.c ipv6: Ensure natural alignment of const ipv6 loopback and router addresses 2024-02-23 08:12:52 +01:00
addrlabel.c ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network 2022-11-25 17:40:17 +01:00
af_inet6.c dccp: Call inet6_destroy_sock() via sk->sk_destruct(). 2023-04-26 11:21:53 +02:00
ah6.c ah6: fix error return code in ah6_input() 2020-11-24 13:27:15 +01:00
anycast.c ipv6: fix memory leaks on IPV6_ADDRFORM path 2020-08-11 15:32:34 +02:00
calipso.c cipso,calipso: resolve a number of problems with the DOI refcounts 2021-03-17 16:43:44 +01:00
datagram.c ipv6: Fix datagram socket connection with DSCP. 2023-02-22 12:47:21 +01:00
esp6.c net: ipv6: fix return value check in esp_remove_trailer 2023-10-25 11:16:45 +02:00
esp6_offload.c xfrm: Linearize the skb after offloading if needed. 2023-06-28 10:15:29 +02:00
exthdrs.c ipv6: fix out-of-bound access in ip6_parse_tlv() 2021-07-20 16:15:52 +02:00
exthdrs_core.c ipv6: Fix out-of-bounds access in ipv6_find_tlv() 2023-05-30 12:42:14 +01:00
exthdrs_offload.c
fib6_notifier.c
fib6_rules.c
fou6.c
icmp.c icmp6: Fix null-ptr-deref of ip6_null_entry->rt6i_idev in icmp6_dev(). 2023-08-11 11:45:18 +02:00
inet6_connection_sock.c net: ipv6: add net argument to ip6_dst_lookup_flow 2020-04-29 16:31:16 +02:00
inet6_hashtables.c secure_seq: use the 64 bits of the siphash for port offset calculation 2022-06-06 08:24:20 +02:00
ip6_checksum.c
ip6_fib.c ipv6: fix potential NULL deref in fib6_add() 2023-12-13 17:42:16 +01:00
ip6_flowlabel.c treewide: Remove uninitialized_var() usage 2023-08-11 11:45:01 +02:00
ip6_gre.c net:ipv6: check return value of pskb_trim() 2023-08-11 11:45:26 +02:00
ip6_icmp.c net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending 2021-03-04 09:39:59 +01:00
ip6_input.c tcp/udp: Make early_demux back namespacified. 2022-11-10 17:46:54 +01:00
ip6_offload.c gso: do not skip outer ip header in case of ipip and net_failover 2022-03-02 11:38:12 +01:00
ip6_offload.h
ip6_output.c ipv6: avoid atomic fragment on GSO packets 2023-11-20 10:29:17 +01:00
ip6_tunnel.c ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim() 2024-01-25 14:33:35 -08:00
ip6_udp_tunnel.c
ip6_vti.c ip6_vti: fix slab-use-after-free in decode_session6 2023-08-30 16:31:48 +02:00
ip6mr.c ip6mr: Fix skb_under_panic in ip6mr_cache_report() 2023-08-11 11:45:37 +02:00
ipcomp6.c
ipv6_sockglue.c udp: Call inet6_destroy_sock() in setsockopt(IPV6_ADDRFORM). 2023-04-26 11:21:52 +02:00
Kconfig net: ipv6: fix kconfig dependency warning for IPV6_SEG6_HMAC 2020-09-26 18:01:29 +02:00
Makefile
mcast.c mld: fix panic in mld_newpack() 2021-06-03 08:38:11 +02:00
mcast_snoop.c
mip6.c
ndisc.c ipv6: adjust ndisc_is_useropt() to also return true for PIO 2023-08-16 18:12:59 +02:00
netfilter.c netfilter: use actual socket sk rather than skb sk when routing harder 2020-11-18 19:18:44 +01:00
output_core.c ipv6: use prandom_u32() for ID generation 2021-07-20 16:16:00 +02:00
ping.c ping6: Fix send to link-local addresses with VRF. 2023-06-21 15:39:58 +02:00
proc.c
protocol.c
raw.c ipv{4,6}/raw: fix output xfrm lookup wrt protocol 2023-06-09 10:23:54 +02:00
reassembly.c vrf: Increment Icmp6InMsgs on the original netdev 2023-08-11 11:45:18 +02:00
route.c net/ipv6: avoid possible UAF in ip6_route_mpath_notify() 2024-03-15 10:48:14 -04:00
seg6.c ipv6: sr: fix possible use-after-free and null-ptr-deref 2024-03-01 13:06:11 +01:00
seg6_hmac.c net: ipv6: unexport __init-annotated seg6_hmac_net_init() 2022-07-07 17:35:10 +02:00
seg6_iptunnel.c seg6: fix skb checksum evaluation in SRH encapsulation/insertion 2022-07-21 21:09:29 +02:00
seg6_local.c seg6: fix skb checksum in SRv6 End.B6 and End.B6.Encaps behaviors 2022-07-21 21:09:29 +02:00
sit.c sit: update dev->needed_headroom in ipip6_tunnel_bind_dev() 2023-05-17 11:13:23 +02:00
syncookies.c dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses. 2023-11-20 10:29:21 +01:00
sysctl_net_ipv6.c
tcp_ipv6.c inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy(). 2023-04-26 11:21:53 +02:00
tcpv6_offload.c
tunnel6.c
udp.c udp6: fix udp6_ehashfn() typo 2023-08-11 11:45:18 +02:00
udp_impl.h tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct(). 2023-04-26 11:21:52 +02:00
udp_offload.c
udplite.c udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated(). 2023-05-30 12:42:14 +01:00
xfrm6_input.c
xfrm6_mode_beet.c
xfrm6_mode_ro.c
xfrm6_mode_transport.c
xfrm6_mode_tunnel.c
xfrm6_output.c xfrm: fix tunnel model fragmentation behavior 2022-04-15 14:14:36 +02:00
xfrm6_policy.c xfrm6: fix inet6_dev refcount underflow problem 2023-10-25 11:17:03 +02:00
xfrm6_protocol.c
xfrm6_state.c
xfrm6_tunnel.c xfrm: clean up xfrm protocol checks 2019-05-25 18:23:41 +02:00