Taehee Yoo beb39adb15 mld: fix panic in mld_newpack() ... [ Upstream commit 020ef930b8 ] mld_newpack() doesn't allow to allocate high order page, only order-0 allocation is allowed. If headroom size is too large, a kernel panic could occur in skb_put(). Test commands: ip netns del A ip netns del B ip netns add A ip netns add B ip link add veth0 type veth peer name veth1 ip link set veth0 netns A ip link set veth1 netns B ip netns exec A ip link set lo up ip netns exec A ip link set veth0 up ip netns exec A ip -6 a a 2001:db8:0::1/64 dev veth0 ip netns exec B ip link set lo up ip netns exec B ip link set veth1 up ip netns exec B ip -6 a a 2001:db8:0::2/64 dev veth1 for i in {1..99} do let A=$i-1 ip netns exec A ip link add ip6gre$i type ip6gre \ local 2001:db8:$A::1 remote 2001:db8:$A::2 encaplimit 100 ip netns exec A ip -6 a a 2001:db8:$i::1/64 dev ip6gre$i ip netns exec A ip link set ip6gre$i up ip netns exec B ip link add ip6gre$i type ip6gre \ local 2001:db8:$A::2 remote 2001:db8:$A::1 encaplimit 100 ip netns exec B ip -6 a a 2001:db8:$i::2/64 dev ip6gre$i ip netns exec B ip link set ip6gre$i up done Splat looks like: kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.12.0+ #891 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:skb_panic+0x15d/0x15f Code: 92 fe 4c 8b 4c 24 10 53 8b 4d 70 45 89 e0 48 c7 c7 00 ae 79 83 41 57 41 56 41 55 48 8b 54 24 a6 26 f9 ff <0f> 0b 48 8b 6c 24 20 89 34 24 e8 4a 4e 92 fe 8b 34 24 48 c7 c1 20 RSP: 0018:ffff88810091f820 EFLAGS: 00010282 RAX: 0000000000000089 RBX: ffff8881086e9000 RCX: 0000000000000000 RDX: 0000000000000089 RSI: 0000000000000008 RDI: ffffed1020123efb RBP: ffff888005f6eac0 R08: ffffed1022fc0031 R09: ffffed1022fc0031 R10: ffff888117e00187 R11: ffffed1022fc0030 R12: 0000000000000028 R13: ffff888008284eb0 R14: 0000000000000ed8 R15: 0000000000000ec0 FS: 0000000000000000(0000) GS:ffff888117c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8b801c5640 CR3: 0000000033c2c006 CR4: 00000000003706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600 ? ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600 skb_put.cold.104+0x22/0x22 ip6_mc_hdr.isra.26.constprop.46+0x12a/0x600 ? rcu_read_lock_sched_held+0x91/0xc0 mld_newpack+0x398/0x8f0 ? ip6_mc_hdr.isra.26.constprop.46+0x600/0x600 ? lock_contended+0xc40/0xc40 add_grhead.isra.33+0x280/0x380 add_grec+0x5ca/0xff0 ? mld_sendpack+0xf40/0xf40 ? lock_downgrade+0x690/0x690 mld_send_initial_cr.part.34+0xb9/0x180 ipv6_mc_dad_complete+0x15d/0x1b0 addrconf_dad_completed+0x8d2/0xbb0 ? lock_downgrade+0x690/0x690 ? addrconf_rs_timer+0x660/0x660 ? addrconf_dad_work+0x73c/0x10e0 addrconf_dad_work+0x73c/0x10e0 Allowing high order page allocation could fix this problem. Fixes: 72e09ad107 ("ipv6: avoid high order allocations") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-06-03 09:00:48 +02:00
..
ila
netfilter	netfilter: x_tables: fix compat match/target pad out-of-bound write	2021-04-16 11:43:21 +02:00
addrconf_core.c
addrconf.c
addrlabel.c
af_inet6.c
ah6.c	xfrm: Use actual socket sk instead of skb socket for xfrm_output_resume	2021-04-14 08:42:05 +02:00
anycast.c
calipso.c	cipso,calipso: resolve a number of problems with the DOI refcounts	2021-03-17 17:06:15 +01:00
datagram.c
esp6_offload.c	xfrm: Provide private skb extensions for segmented and hw offloaded ESP packets	2021-04-14 08:42:07 +02:00
esp6.c	xfrm: Use actual socket sk instead of skb socket for xfrm_output_resume	2021-04-14 08:42:05 +02:00
exthdrs_core.c
exthdrs_offload.c
exthdrs.c
fib6_notifier.c
fib6_rules.c
fou6.c
icmp.c
inet6_connection_sock.c
inet6_hashtables.c
ip6_checksum.c
ip6_fib.c	ipv6: fix suspecious RCU usage warning	2021-03-30 14:31:57 +02:00
ip6_flowlabel.c
ip6_gre.c	ipv6: remove extra dev_hold() for fallback tunnels	2021-05-22 11:40:55 +02:00
ip6_icmp.c
ip6_input.c	ipv6: weaken the v4mapped source check	2021-03-30 14:32:01 +02:00
ip6_offload.c
ip6_offload.h
ip6_output.c
ip6_tunnel.c	ipv6: remove extra dev_hold() for fallback tunnels	2021-05-22 11:40:55 +02:00
ip6_udp_tunnel.c
ip6_vti.c	ipv6: remove extra dev_hold() for fallback tunnels	2021-05-22 11:40:55 +02:00
ip6mr.c
ipcomp6.c
ipv6_sockglue.c
Kconfig
Makefile
mcast_snoop.c	net: bridge: mcast: fix broken length + header check for MRDv6 Adv.	2021-05-14 09:50:44 +02:00
mcast.c	mld: fix panic in mld_newpack()	2021-06-03 09:00:48 +02:00
mip6.c
ndisc.c
netfilter.c
output_core.c
ping.c
proc.c
protocol.c
raw.c	net-ipv6: bugfix - raw & sctp - switch to ipv6_can_nonlocal_bind()	2021-04-14 08:42:02 +02:00
reassembly.c
route.c	net: ipv6: check for validity before dereferencing cfg->fc_nlinfo.nlh	2021-04-14 08:41:57 +02:00
rpl_iptunnel.c
rpl.c
seg6_hmac.c
seg6_iptunnel.c
seg6_local.c
seg6.c
sit.c	ipv6: remove extra dev_hold() for fallback tunnels	2021-05-22 11:40:55 +02:00
syncookies.c
sysctl_net_ipv6.c
tcp_ipv6.c	ipv6: weaken the v4mapped source check	2021-03-30 14:32:01 +02:00
tcpv6_offload.c
tunnel6.c
udp_impl.h
udp_offload.c
udp.c
udplite.c
xfrm6_input.c
xfrm6_output.c
xfrm6_policy.c
xfrm6_protocol.c
xfrm6_state.c
xfrm6_tunnel.c