753969 Commits

Author SHA1 Message Date
John Fastabend
9617456054 bpf: parse and verdict prog attach may race with bpf map update
In the sockmap design BPF programs (SK_SKB_STREAM_PARSER,
SK_SKB_STREAM_VERDICT and SK_MSG_VERDICT) are attached to the sockmap
map type and when a sock is added to the map the programs are used by
the socket. However, sockmap updates from both userspace and BPF
programs can happen concurrently with the attach and detach of these
programs.

To resolve this we use the bpf_prog_inc_not_zero and a READ_ONCE()
primitive to ensure the program pointer is not refeched and
possibly NULL'd before the refcnt increment. This happens inside
a RCU critical section so although the pointer reference in the map
object may be NULL (by a concurrent detach operation) the reference
from READ_ONCE will not be free'd until after grace period. This
ensures the object returned by READ_ONCE() is valid through the
RCU criticl section and safe to use as long as we "know" it may
be free'd shortly.

Daniel spotted a case in the sock update API where instead of using
the READ_ONCE() program reference we used the pointer from the
original map, stab->bpf_{verdict|parse|txmsg}. The problem with this
is the logic checks the object returned from the READ_ONCE() is not
NULL and then tries to reference the object again but using the
above map pointer, which may have already been NULL'd by a parallel
detach operation. If this happened bpf_porg_inc_not_zero could
dereference a NULL pointer.

Fix this by using variable returned by READ_ONCE() that is checked
for NULL.

Fixes: 2f857d04601a ("bpf: sockmap, remove STRPARSER map_flags and add multi-map support")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-05-18 00:27:37 +02:00
John Fastabend
a593f70831 bpf: sockmap update rollback on error can incorrectly dec prog refcnt
If the user were to only attach one of the parse or verdict programs
then it is possible a subsequent sockmap update could incorrectly
decrement the refcnt on the program. This happens because in the
rollback logic, after an error, we have to decrement the program
reference count when its been incremented. However, we only increment
the program reference count if the user has both a verdict and a
parse program. The reason for this is because, at least at the
moment, both are required for any one to be meaningful. The problem
fixed here is in the rollback path we decrement the program refcnt
even if only one existing. But we never incremented the refcnt in
the first place creating an imbalance.

This patch fixes the error path to handle this case.

Fixes: 2f857d04601a ("bpf: sockmap, remove STRPARSER map_flags and add multi-map support")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-05-18 00:27:37 +02:00
Willem de Bruijn
113f99c335 net: test tailroom before appending to linear skb
Device features may change during transmission. In particular with
corking, a device may toggle scatter-gather in between allocating
and writing to an skb.

Do not unconditionally assume that !NETIF_F_SG at write time implies
that the same held at alloc time and thus the skb has sufficient
tailroom.

This issue predates git history.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 17:05:01 -04:00
David S. Miller
374edea4aa Merge branch 'ip6_gre-Fixes-in-headroom-handling'
Petr Machata says:

====================
net: ip6_gre: Fixes in headroom handling

This series mends some problems in headroom management in ip6_gre
module. The current code base has the following three closely-related
problems:

- ip6gretap tunnels neglect to ensure there's enough writable headroom
  before pushing GRE headers.

- ip6erspan does this, but assumes that dev->needed_headroom is primed.
  But that doesn't happen until ip6_tnl_xmit() is called later. Thus for
  the first packet, ip6erspan actually behaves like ip6gretap above.

- ip6erspan shares some of the code with ip6gretap, including
  calculations of needed header length. While there is custom
  ERSPAN-specific code for calculating the headroom, the computed
  values are overwritten by the ip6gretap code.

The first two issues lead to a kernel panic in situations where a packet
is mirrored from a veth device to the device in question. They are
fixed, respectively, in patches  and , which include the full panic
trace and a reproducer.

The rest of the patchset deals with the last issue. In patches  to ,
several functions are split up into reusable parts. Finally in patch 
these blocks are used to compose ERSPAN-specific callbacks where
necessary to fix the hlen calculation.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:20 -04:00
Petr Machata
2d665034f2 net: ip6_gre: Fix ip6erspan hlen calculation
Even though ip6erspan_tap_init() sets up hlen and tun_hlen according to
what ERSPAN needs, it goes ahead to call ip6gre_tnl_link_config() which
overwrites these settings with GRE-specific ones.

Similarly for changelink callbacks, which are handled by
ip6gre_changelink() calls ip6gre_tnl_change() calls
ip6gre_tnl_link_config() as well.

The difference ends up being 12 vs. 20 bytes, and this is generally not
a problem, because a 12-byte request likely ends up allocating more and
the extra 8 bytes are thus available. However correct it is not.

So replace the newlink and changelink callbacks with an ERSPAN-specific
ones, reusing the newly-introduced _common() functions.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Petr Machata
c8632fc30b net: ip6_gre: Split up ip6gre_changelink()
Extract from ip6gre_changelink() a reusable function
ip6gre_changelink_common(). This will allow introduction of
ERSPAN-specific _changelink() function with not a lot of code
duplication.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Petr Machata
7fa38a7c85 net: ip6_gre: Split up ip6gre_newlink()
Extract from ip6gre_newlink() a reusable function
ip6gre_newlink_common(). The ip6gre_tnl_link_config() call needs to be
made customizable for ERSPAN, thus reorder it with calls to
ip6_tnl_change_mtu() and dev_hold(), and extract the whole tail to the
caller, ip6gre_newlink(). Thus enable an ERSPAN-specific _newlink()
function without a lot of duplicity.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Petr Machata
a6465350ef net: ip6_gre: Split up ip6gre_tnl_change()
Split a reusable function ip6gre_tnl_copy_tnl_parm() from
ip6gre_tnl_change(). This will allow ERSPAN-specific code to
reuse the common parts while customizing the behavior for ERSPAN.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Petr Machata
a483373ead net: ip6_gre: Split up ip6gre_tnl_link_config()
The function ip6gre_tnl_link_config() is used for setting up
configuration of both ip6gretap and ip6erspan tunnels. Split the
function into the common part and the route-lookup part. The latter then
takes the calculated header length as an argument. This split will allow
the patches down the line to sneak in a custom header length computation
for the ERSPAN tunnel.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Petr Machata
5691484df9 net: ip6_gre: Fix headroom request in ip6erspan_tunnel_xmit()
dev->needed_headroom is not primed until ip6_tnl_xmit(), so it starts
out zero. Thus the call to skb_cow_head() fails to actually make sure
there's enough headroom to push the ERSPAN headers to. That can lead to
the panic cited below. (Reproducer below that).

Fix by requesting either needed_headroom if already primed, or just the
bare minimum needed for the header otherwise.

[  190.703567] kernel BUG at net/core/skbuff.c:104!
[  190.708384] invalid opcode: 0000 [] PREEMPT SMP KASAN PTI
[  190.714007] Modules linked in: act_mirred cls_matchall ip6_gre ip6_tunnel tunnel6 gre sch_ingress vrf veth x86_pkg_temp_thermal mlx_platform nfsd e1000e leds_mlxcpld
[  190.728975] CPU: 1 PID: 959 Comm: kworker/1:2 Not tainted 4.17.0-rc4-net_master-custom-139 
[  190.737647] Hardware name: Mellanox Technologies Ltd. "MSN2410-CB2F"/"SA000874", BIOS 4.6.5 03/08/2016
[  190.747006] Workqueue: ipv6_addrconf addrconf_dad_work
[  190.752222] RIP: 0010:skb_panic+0xc3/0x100
[  190.756358] RSP: 0018:ffff8801d54072f0 EFLAGS: 00010282
[  190.761629] RAX: 0000000000000085 RBX: ffff8801c1a8ecc0 RCX: 0000000000000000
[  190.768830] RDX: 0000000000000085 RSI: dffffc0000000000 RDI: ffffed003aa80e54
[  190.776025] RBP: ffff8801bd1ec5a0 R08: ffffed003aabce19 R09: ffffed003aabce19
[  190.783226] R10: 0000000000000001 R11: ffffed003aabce18 R12: ffff8801bf695dbe
[  190.790418] R13: 0000000000000084 R14: 00000000000006c0 R15: ffff8801bf695dc8
[  190.797621] FS:  0000000000000000(0000) GS:ffff8801d5400000(0000) knlGS:0000000000000000
[  190.805786] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  190.811582] CR2: 000055fa929aced0 CR3: 0000000003228004 CR4: 00000000001606e0
[  190.818790] Call Trace:
[  190.821264]  <IRQ>
[  190.823314]  ? ip6erspan_tunnel_xmit+0x5e4/0x1982 [ip6_gre]
[  190.828940]  ? ip6erspan_tunnel_xmit+0x5e4/0x1982 [ip6_gre]
[  190.834562]  skb_push+0x78/0x90
[  190.837749]  ip6erspan_tunnel_xmit+0x5e4/0x1982 [ip6_gre]
[  190.843219]  ? ip6gre_tunnel_ioctl+0xd90/0xd90 [ip6_gre]
[  190.848577]  ? debug_check_no_locks_freed+0x210/0x210
[  190.853679]  ? debug_check_no_locks_freed+0x210/0x210
[  190.858783]  ? print_irqtrace_events+0x120/0x120
[  190.863451]  ? sched_clock_cpu+0x18/0x210
[  190.867496]  ? cyc2ns_read_end+0x10/0x10
[  190.871474]  ? skb_network_protocol+0x76/0x200
[  190.875977]  dev_hard_start_xmit+0x137/0x770
[  190.880317]  ? do_raw_spin_trylock+0x6d/0xa0
[  190.884624]  sch_direct_xmit+0x2ef/0x5d0
[  190.888589]  ? pfifo_fast_dequeue+0x3fa/0x670
[  190.892994]  ? pfifo_fast_change_tx_queue_len+0x810/0x810
[  190.898455]  ? __lock_is_held+0xa0/0x160
[  190.902422]  __qdisc_run+0x39e/0xfc0
[  190.906041]  ? _raw_spin_unlock+0x29/0x40
[  190.910090]  ? pfifo_fast_enqueue+0x24b/0x3e0
[  190.914501]  ? sch_direct_xmit+0x5d0/0x5d0
[  190.918658]  ? pfifo_fast_dequeue+0x670/0x670
[  190.923047]  ? __dev_queue_xmit+0x172/0x1770
[  190.927365]  ? preempt_count_sub+0xf/0xd0
[  190.931421]  __dev_queue_xmit+0x410/0x1770
[  190.935553]  ? ___slab_alloc+0x605/0x930
[  190.939524]  ? print_irqtrace_events+0x120/0x120
[  190.944186]  ? memcpy+0x34/0x50
[  190.947364]  ? netdev_pick_tx+0x1c0/0x1c0
[  190.951428]  ? __skb_clone+0x2fd/0x3d0
[  190.955218]  ? __copy_skb_header+0x270/0x270
[  190.959537]  ? rcu_read_lock_sched_held+0x93/0xa0
[  190.964282]  ? kmem_cache_alloc+0x344/0x4d0
[  190.968520]  ? cyc2ns_read_end+0x10/0x10
[  190.972495]  ? skb_clone+0x123/0x230
[  190.976112]  ? skb_split+0x820/0x820
[  190.979747]  ? tcf_mirred+0x554/0x930 [act_mirred]
[  190.984582]  tcf_mirred+0x554/0x930 [act_mirred]
[  190.989252]  ? tcf_mirred_act_wants_ingress.part.2+0x10/0x10 [act_mirred]
[  190.996109]  ? __lock_acquire+0x706/0x26e0
[  191.000239]  ? sched_clock_cpu+0x18/0x210
[  191.004294]  tcf_action_exec+0xcf/0x2a0
[  191.008179]  tcf_classify+0xfa/0x340
[  191.011794]  __netif_receive_skb_core+0x8e1/0x1c60
[  191.016630]  ? debug_check_no_locks_freed+0x210/0x210
[  191.021732]  ? nf_ingress+0x500/0x500
[  191.025458]  ? process_backlog+0x347/0x4b0
[  191.029619]  ? print_irqtrace_events+0x120/0x120
[  191.034302]  ? lock_acquire+0xd8/0x320
[  191.038089]  ? process_backlog+0x1b6/0x4b0
[  191.042246]  ? process_backlog+0xc2/0x4b0
[  191.046303]  process_backlog+0xc2/0x4b0
[  191.050189]  net_rx_action+0x5cc/0x980
[  191.053991]  ? napi_complete_done+0x2c0/0x2c0
[  191.058386]  ? mark_lock+0x13d/0xb40
[  191.062001]  ? clockevents_program_event+0x6b/0x1d0
[  191.066922]  ? print_irqtrace_events+0x120/0x120
[  191.071593]  ? __lock_is_held+0xa0/0x160
[  191.075566]  __do_softirq+0x1d4/0x9d2
[  191.079282]  ? ip6_finish_output2+0x524/0x1460
[  191.083771]  do_softirq_own_stack+0x2a/0x40
[  191.087994]  </IRQ>
[  191.090130]  do_softirq.part.13+0x38/0x40
[  191.094178]  __local_bh_enable_ip+0x135/0x190
[  191.098591]  ip6_finish_output2+0x54d/0x1460
[  191.102916]  ? ip6_forward_finish+0x2f0/0x2f0
[  191.107314]  ? ip6_mtu+0x3c/0x2c0
[  191.110674]  ? ip6_finish_output+0x2f8/0x650
[  191.114992]  ? ip6_output+0x12a/0x500
[  191.118696]  ip6_output+0x12a/0x500
[  191.122223]  ? ip6_route_dev_notify+0x5b0/0x5b0
[  191.126807]  ? ip6_finish_output+0x650/0x650
[  191.131120]  ? ip6_fragment+0x1a60/0x1a60
[  191.135182]  ? icmp6_dst_alloc+0x26e/0x470
[  191.139317]  mld_sendpack+0x672/0x830
[  191.143021]  ? igmp6_mcf_seq_next+0x2f0/0x2f0
[  191.147429]  ? __local_bh_enable_ip+0x77/0x190
[  191.151913]  ipv6_mc_dad_complete+0x47/0x90
[  191.156144]  addrconf_dad_completed+0x561/0x720
[  191.160731]  ? addrconf_rs_timer+0x3a0/0x3a0
[  191.165036]  ? mark_held_locks+0xc9/0x140
[  191.169095]  ? __local_bh_enable_ip+0x77/0x190
[  191.173570]  ? addrconf_dad_work+0x50d/0xa20
[  191.177886]  ? addrconf_dad_work+0x529/0xa20
[  191.182194]  addrconf_dad_work+0x529/0xa20
[  191.186342]  ? addrconf_dad_completed+0x720/0x720
[  191.191088]  ? __lock_is_held+0xa0/0x160
[  191.195059]  ? process_one_work+0x45d/0xe20
[  191.199302]  ? process_one_work+0x51e/0xe20
[  191.203531]  ? rcu_read_lock_sched_held+0x93/0xa0
[  191.208279]  process_one_work+0x51e/0xe20
[  191.212340]  ? pwq_dec_nr_in_flight+0x200/0x200
[  191.216912]  ? get_lock_stats+0x4b/0xf0
[  191.220788]  ? preempt_count_sub+0xf/0xd0
[  191.224844]  ? worker_thread+0x219/0x860
[  191.228823]  ? do_raw_spin_trylock+0x6d/0xa0
[  191.233142]  worker_thread+0xeb/0x860
[  191.236848]  ? process_one_work+0xe20/0xe20
[  191.241095]  kthread+0x206/0x300
[  191.244352]  ? process_one_work+0xe20/0xe20
[  191.248587]  ? kthread_stop+0x570/0x570
[  191.252459]  ret_from_fork+0x3a/0x50
[  191.256082] Code: 14 3e ff 8b 4b 78 55 4d 89 f9 41 56 41 55 48 c7 c7 a0 cf db 82 41 54 44 8b 44 24 2c 48 8b 54 24 30 48 8b 74 24 20 e8 16 94 13 ff <0f> 0b 48 c7 c7 60 8e 1f 85 48 83 c4 20 e8 55 ef a6 ff 89 74 24
[  191.275327] RIP: skb_panic+0xc3/0x100 RSP: ffff8801d54072f0
[  191.281024] ---[ end trace 7ea51094e099e006 ]---
[  191.285724] Kernel panic - not syncing: Fatal exception in interrupt
[  191.292168] Kernel Offset: disabled
[  191.295697] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---

Reproducer:

	ip link add h1 type veth peer name swp1
	ip link add h3 type veth peer name swp3

	ip link set dev h1 up
	ip address add 192.0.2.1/28 dev h1

	ip link add dev vh3 type vrf table 20
	ip link set dev h3 master vh3
	ip link set dev vh3 up
	ip link set dev h3 up

	ip link set dev swp3 up
	ip address add dev swp3 2001:db8:2::1/64

	ip link set dev swp1 up
	tc qdisc add dev swp1 clsact

	ip link add name gt6 type ip6erspan \
		local 2001:db8:2::1 remote 2001:db8:2::2 oseq okey 123
	ip link set dev gt6 up

	sleep 1

	tc filter add dev swp1 ingress pref 1000 matchall skip_hw \
		action mirred egress mirror dev gt6
	ping -I h1 192.0.2.2

Fixes: e41c7c68ea77 ("ip6erspan: make sure enough headroom at xmit.")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Petr Machata
01b8d064d5 net: ip6_gre: Request headroom in __gre6_xmit()
__gre6_xmit() pushes GRE headers before handing over to ip6_tnl_xmit()
for generic IP-in-IP processing. However it doesn't make sure that there
is enough headroom to push the header to. That can lead to the panic
cited below. (Reproducer below that).

Fix by requesting either needed_headroom if already primed, or just the
bare minimum needed for the header otherwise.

[  158.576725] kernel BUG at net/core/skbuff.c:104!
[  158.581510] invalid opcode: 0000 [] PREEMPT SMP KASAN PTI
[  158.587174] Modules linked in: act_mirred cls_matchall ip6_gre ip6_tunnel tunnel6 gre sch_ingress vrf veth x86_pkg_temp_thermal mlx_platform nfsd e1000e leds_mlxcpld
[  158.602268] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 4.17.0-rc4-net_master-custom-139 
[  158.610938] Hardware name: Mellanox Technologies Ltd. "MSN2410-CB2F"/"SA000874", BIOS 4.6.5 03/08/2016
[  158.620426] RIP: 0010:skb_panic+0xc3/0x100
[  158.624586] RSP: 0018:ffff8801d3f27110 EFLAGS: 00010286
[  158.629882] RAX: 0000000000000082 RBX: ffff8801c02cc040 RCX: 0000000000000000
[  158.637127] RDX: 0000000000000082 RSI: dffffc0000000000 RDI: ffffed003a7e4e18
[  158.644366] RBP: ffff8801bfec8020 R08: ffffed003aabce19 R09: ffffed003aabce19
[  158.651574] R10: 000000000000000b R11: ffffed003aabce18 R12: ffff8801c364de66
[  158.658786] R13: 000000000000002c R14: 00000000000000c0 R15: ffff8801c364de68
[  158.666007] FS:  0000000000000000(0000) GS:ffff8801d5400000(0000) knlGS:0000000000000000
[  158.674212] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  158.680036] CR2: 00007f4b3702dcd0 CR3: 0000000003228002 CR4: 00000000001606e0
[  158.687228] Call Trace:
[  158.689752]  ? __gre6_xmit+0x246/0xd80 [ip6_gre]
[  158.694475]  ? __gre6_xmit+0x246/0xd80 [ip6_gre]
[  158.699141]  skb_push+0x78/0x90
[  158.702344]  __gre6_xmit+0x246/0xd80 [ip6_gre]
[  158.706872]  ip6gre_tunnel_xmit+0x3bc/0x610 [ip6_gre]
[  158.711992]  ? __gre6_xmit+0xd80/0xd80 [ip6_gre]
[  158.716668]  ? debug_check_no_locks_freed+0x210/0x210
[  158.721761]  ? print_irqtrace_events+0x120/0x120
[  158.726461]  ? sched_clock_cpu+0x18/0x210
[  158.730572]  ? sched_clock_cpu+0x18/0x210
[  158.734692]  ? cyc2ns_read_end+0x10/0x10
[  158.738705]  ? skb_network_protocol+0x76/0x200
[  158.743216]  ? netif_skb_features+0x1b2/0x550
[  158.747648]  dev_hard_start_xmit+0x137/0x770
[  158.752010]  sch_direct_xmit+0x2ef/0x5d0
[  158.755992]  ? pfifo_fast_dequeue+0x3fa/0x670
[  158.760460]  ? pfifo_fast_change_tx_queue_len+0x810/0x810
[  158.765975]  ? __lock_is_held+0xa0/0x160
[  158.770002]  __qdisc_run+0x39e/0xfc0
[  158.773673]  ? _raw_spin_unlock+0x29/0x40
[  158.777781]  ? pfifo_fast_enqueue+0x24b/0x3e0
[  158.782191]  ? sch_direct_xmit+0x5d0/0x5d0
[  158.786372]  ? pfifo_fast_dequeue+0x670/0x670
[  158.790818]  ? __dev_queue_xmit+0x172/0x1770
[  158.795195]  ? preempt_count_sub+0xf/0xd0
[  158.799313]  __dev_queue_xmit+0x410/0x1770
[  158.803512]  ? ___slab_alloc+0x605/0x930
[  158.807525]  ? ___slab_alloc+0x605/0x930
[  158.811540]  ? memcpy+0x34/0x50
[  158.814768]  ? netdev_pick_tx+0x1c0/0x1c0
[  158.818895]  ? __skb_clone+0x2fd/0x3d0
[  158.822712]  ? __copy_skb_header+0x270/0x270
[  158.827079]  ? rcu_read_lock_sched_held+0x93/0xa0
[  158.831903]  ? kmem_cache_alloc+0x344/0x4d0
[  158.836199]  ? skb_clone+0x123/0x230
[  158.839869]  ? skb_split+0x820/0x820
[  158.843521]  ? tcf_mirred+0x554/0x930 [act_mirred]
[  158.848407]  tcf_mirred+0x554/0x930 [act_mirred]
[  158.853104]  ? tcf_mirred_act_wants_ingress.part.2+0x10/0x10 [act_mirred]
[  158.860005]  ? __lock_acquire+0x706/0x26e0
[  158.864162]  ? mark_lock+0x13d/0xb40
[  158.867832]  tcf_action_exec+0xcf/0x2a0
[  158.871736]  tcf_classify+0xfa/0x340
[  158.875402]  __netif_receive_skb_core+0x8e1/0x1c60
[  158.880334]  ? nf_ingress+0x500/0x500
[  158.884059]  ? process_backlog+0x347/0x4b0
[  158.888241]  ? lock_acquire+0xd8/0x320
[  158.892050]  ? process_backlog+0x1b6/0x4b0
[  158.896228]  ? process_backlog+0xc2/0x4b0
[  158.900291]  process_backlog+0xc2/0x4b0
[  158.904210]  net_rx_action+0x5cc/0x980
[  158.908047]  ? napi_complete_done+0x2c0/0x2c0
[  158.912525]  ? rcu_read_unlock+0x80/0x80
[  158.916534]  ? __lock_is_held+0x34/0x160
[  158.920541]  __do_softirq+0x1d4/0x9d2
[  158.924308]  ? trace_event_raw_event_irq_handler_exit+0x140/0x140
[  158.930515]  run_ksoftirqd+0x1d/0x40
[  158.934152]  smpboot_thread_fn+0x32b/0x690
[  158.938299]  ? sort_range+0x20/0x20
[  158.941842]  ? preempt_count_sub+0xf/0xd0
[  158.945940]  ? schedule+0x5b/0x140
[  158.949412]  kthread+0x206/0x300
[  158.952689]  ? sort_range+0x20/0x20
[  158.956249]  ? kthread_stop+0x570/0x570
[  158.960164]  ret_from_fork+0x3a/0x50
[  158.963823] Code: 14 3e ff 8b 4b 78 55 4d 89 f9 41 56 41 55 48 c7 c7 a0 cf db 82 41 54 44 8b 44 24 2c 48 8b 54 24 30 48 8b 74 24 20 e8 16 94 13 ff <0f> 0b 48 c7 c7 60 8e 1f 85 48 83 c4 20 e8 55 ef a6 ff 89 74 24
[  158.983235] RIP: skb_panic+0xc3/0x100 RSP: ffff8801d3f27110
[  158.988935] ---[ end trace 5af56ee845aa6cc8 ]---
[  158.993641] Kernel panic - not syncing: Fatal exception in interrupt
[  159.000176] Kernel Offset: disabled
[  159.003767] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---

Reproducer:

	ip link add h1 type veth peer name swp1
	ip link add h3 type veth peer name swp3

	ip link set dev h1 up
	ip address add 192.0.2.1/28 dev h1

	ip link add dev vh3 type vrf table 20
	ip link set dev h3 master vh3
	ip link set dev vh3 up
	ip link set dev h3 up

	ip link set dev swp3 up
	ip address add dev swp3 2001:db8:2::1/64

	ip link set dev swp1 up
	tc qdisc add dev swp1 clsact

	ip link add name gt6 type ip6gretap \
		local 2001:db8:2::1 remote 2001:db8:2::2
	ip link set dev gt6 up

	sleep 1

	tc filter add dev swp1 ingress pref 1000 matchall skip_hw \
		action mirred egress mirror dev gt6
	ping -I h1 192.0.2.2

Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 16:50:06 -04:00
Jesper Dangaard Brouer
deea81228b selftests/bpf: check return value of fopen in test_verifier.c
Commit 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled")
forgot to check return value of fopen.

This caused some confusion, when running test_verifier (from
tools/testing/selftests/bpf/) on an older kernel (< v4.4) as it will
simply seqfault.

This fix avoids the segfault and prints an error, but allow program to
continue.  Given the sysctl was introduced in 1be7f75d1668 ("bpf:
enable non-root eBPF programs"), we know that the running kernel
cannot support unpriv, thus continue with unpriv_disabled = true.

Fixes: 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-05-17 22:18:46 +02:00
William Tu
02f99df187 erspan: fix invalid erspan version.
ERSPAN only support version 1 and 2.  When packets send to an
erspan device which does not have proper version number set,
drop the packet.  In real case, we observe multicast packets
sent to the erspan pernet device, erspan0, which does not have
erspan version configured.

Reported-by: Greg Rose <gvrose8192@gmail.com>
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 15:48:49 -04:00
Thomas Gleixner
fed71f7d98 x86/apic/x2apic: Initialize cluster ID properly
Rick bisected a regression on large systems which use the x2apic cluster
mode for interrupt delivery to the commit wich reworked the cluster
management.

The problem is caused by a missing initialization of the clusterid field
in the shared cluster data structures. So all structures end up with
cluster ID 0 which only allows sharing between all CPUs which belong to
cluster 0. All other CPUs with a cluster ID > 0 cannot share the data
structure because they cannot find existing data with their cluster
ID. This causes malfunction with IPIs because IPIs are sent to the wrong
cluster and the caller waits for ever that the target CPU handles the IPI.

Add the missing initialization when a upcoming CPU is the first in a
cluster so that the later booting CPUs can find the data and share it for
proper operation.

Fixes: 023a611748fd ("x86/apic/x2apic: Simplify cluster management")
Reported-by: Rick Warner <rick@microway.com>
Bisected-by: Rick Warner <rick@microway.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Rick Warner <rick@microway.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1805171418210.1947@nanos.tec.linutronix.de
2018-05-17 21:00:12 +02:00
David S. Miller
d13d170cba Merge branch 'ibmvnic-Fix-bugs-and-memory-leaks'
Thomas Falcon says:

====================
ibmvnic: Fix bugs and memory leaks

This is a small patch series fixing up some bugs and memory leaks
in the ibmvnic driver. The first fix frees up previously allocated
memory that should be freed in case of an error. The second fixes
a reset case that was failing due to TX/RX queue IRQ's being
erroneously disabled without being enabled again. The final patch
fixes incorrect reallocated of statistics buffers during a device
reset, resulting in loss of statistics information and a memory leak.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 14:57:20 -04:00
Thomas Falcon
0718421389 ibmvnic: Fix statistics buffers memory leak
Move initialization of statistics buffers from ibmvnic_init function
into ibmvnic_probe. In the current state, ibmvnic_init will be called
again during a device reset, resulting in the allocation of new
buffers without freeing the old ones.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 14:57:19 -04:00
Thomas Falcon
134bbe7f21 ibmvnic: Fix non-fatal firmware error reset
It is not necessary to disable interrupt lines here during a reset
to handle a non-fatal firmware error. Move that call within the code
block that handles the other cases that do require interrupts to be
disabled and re-enabled.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 14:57:19 -04:00
Thomas Falcon
4cf2ddf3e3 ibmvnic: Free coherent DMA memory if FW map failed
If the firmware map fails for whatever reason, remember to free
up the memory after.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 14:57:19 -04:00
David Ahern
5a847a6e14 net/ipv4: Initialize proto and ports in flow struct
Updating the FIB tracepoint for the recent change to allow rules using
the protocol and ports exposed a few places where the entries in the flow
struct are not initialized.

For __fib_validate_source add the call to fib4_rules_early_flow_dissect
since it is invoked for the input path. For netfilter, add the memset on
the flow struct to avoid future problems like this. In ip_route_input_slow
need to set the fields if the skb dissection does not happen.

Fixes: bfff4862653b ("net: fib_rules: support for match on ip_proto, sport and dport")
Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 14:55:21 -04:00
Matt Mullins
8ab6ffba14 tls: don't use stack memory in a scatterlist
scatterlist code expects virt_to_page() to work, which fails with
CONFIG_VMAP_STACK=y.

Fixes: c46234ebb4d1e ("tls: RX path for ktls")
Signed-off-by: Matt Mullins <mmullins@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-05-17 14:49:38 -04:00
Linus Torvalds
58ddfe6c3a * ARM/ARM64 locking fixes
* x86 fixes: PCID, UMIP, locking
 * Improved support for recent Windows version that have a 2048 Hz
 APIC timer.
 * Rename KVM_HINTS_DEDICATED CPUID bit to KVM_HINTS_REALTIME
 * Better behaved selftests.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.22 (GNU/Linux)
 
 iQEcBAABAgAGBQJa/bkTAAoJEL/70l94x66Dzf8IAJ1GqtXi0CNbq8MvU4QIqw0L
 HLIRoe/QgkTeTUa2fwirEuu5I+/wUyPvy5sAIsn/F5eiZM7nciLm+fYzw6F2uPIm
 lSCqKpVwmh8dPl1SBaqPnTcB1HPVwcCgc2SF9Ph7yZCUwFUtoeUuPj8v6Qy6y21g
 jfobHFZa3MrFgi7kPxOXSrC1qxuNJL9yLB5mwCvCK/K7jj2nrGJkLLDuzgReCqvz
 isOdpof3hz8whXDQG5cTtybBgE9veym4YqJY8R5ANXBKqbFlhaNF1T3xXrdPMISZ
 7bsGgkhYEOqeQsPrFwzAIiFxe2DogFwkn1BcvJ1B+duXrayt5CBnDPRB6Yxg00M=
 =H0d0
 -----END PGP SIGNATURE-----

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:

 - ARM/ARM64 locking fixes

 - x86 fixes: PCID, UMIP, locking

 - improved support for recent Windows version that have a 2048 Hz APIC
   timer

 - rename KVM_HINTS_DEDICATED CPUID bit to KVM_HINTS_REALTIME

 - better behaved selftests

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  kvm: rename KVM_HINTS_DEDICATED to KVM_HINTS_REALTIME
  KVM: arm/arm64: VGIC/ITS save/restore: protect kvm_read_guest() calls
  KVM: arm/arm64: VGIC/ITS: protect kvm_read_guest() calls with SRCU lock
  KVM: arm/arm64: VGIC/ITS: Promote irq_lock() in update_affinity
  KVM: arm/arm64: Properly protect VGIC locks from IRQs
  KVM: X86: Lower the default timer frequency limit to 200us
  KVM: vmx: update sec exec controls for UMIP iff emulating UMIP
  kvm: x86: Suppress CR3_PCID_INVD bit only when PCIDs are enabled
  KVM: selftests: exit with 0 status code when tests cannot be run
  KVM: hyperv: idr_find needs RCU protection
  x86: Delay skip of emulated hypercall instruction
  KVM: Extend MAX_IRQ_ROUTES to 4096 for all archs
2018-05-17 10:23:36 -07:00
Paolo Bonzini
e20ac8b11b KVM: s390: Fix vsie handling for transactional diagnostic block
vsie (nested KVM) might reject a valid input. Fix it.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.22 (GNU/Linux)
 
 iQIcBAABAgAGBQJa/VnoAAoJEBF7vIC1phx8N+oP/jIiCdMaAoQtYj2KJvdO9LdJ
 cp5jxlZwhuVSkqnJ6rMRHT8cz+2EM3Ra98p7z+KjScD+XrLuNq3PzyhvjauiEJEl
 /ts0M/YhtY9OUrW40gCpUYQ4GKNHh+c4WX97DiOC1C64JoHUmQwh/qcKkCVXNh7k
 IUCnoQhNxXNlARIpL+h55TGKc8wefvYpdcBJLiUmiyDQ7H7f9jZmG/NMzh+/kWfy
 4i3zmzEmkqKqnSa5Fj+83Z7JqiWMcWJzJuBmaHFsSooHiXO7qKqM+vCWnqupsuTI
 6ucD6p4uThAqRKwVjiCzAjJslvtXB8UMrU+WA4dJKIY3/tFz9u7XTixPsVNe5L7H
 d9JaZ8szptD225oMcXaWrL1xEYcs+sKKFeBKxnNQZycp/b3mN8nQ2A0VM5rZIQ8u
 YTGjYzf2FbS5puBWFIodcJUvvACm9esoTxN6Ro2XQroPxfhpmOHxbAd/O9kPjbLf
 RG4T0b36QYrlBoPFg8pYIK0hG3z0aEAVQfrPKLi9NFblG47ysF9nhHU+RA9cdeD0
 W0gpf/AjJ2D2pcB/1oTSAoBKm1Vlk5lLiABuOmW9+PETM8IDshOnY2P9HXMCgUt+
 EmBd2rEK0u9OGfq6kO1GsiPsAya1LDqgmGScPFc3TPZBRmIL5jqBpDyF1feSfeDW
 EmTh00tTEWvDHIC1hok+
 =4Got
 -----END PGP SIGNATURE-----

Merge tag 'kvm-s390-master-4.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-master

KVM: s390: Fix vsie handling for transactional diagnostic block

vsie (nested KVM) might reject a valid input. Fix it.
2018-05-17 19:22:59 +02:00
Linus Torvalds
7c9a0fc79f sound fixes for 4.17-rc6
We have a core fix in the compat code for covering a potential race
 (double references), but it's a very minor change.
 The rest are all small device-specific quirks, as well as a correction
 of the new UAC3 support code.
 -----BEGIN PGP SIGNATURE-----
 
 iQJCBAABCAAsFiEEIXTw5fNLNI7mMiVaLtJE4w1nLE8FAlr8J4oOHHRpd2FpQHN1
 c2UuZGUACgkQLtJE4w1nLE/u9BAAonj61ZwTiKYQS6Zgv/yXnhGeaqMgnu1AG/pf
 c3MI9mjR1E+WZy8CehCgNuvd9b6rc5PwrNgmTP58nu/DMZB1DeQkWJgv2fNm3y1c
 byuBHG+xH2AdH+mpjIWcMU857T75oaDaj3Gu36ORacCDGOHsdL0OyynT0y/C0LUd
 SwEegucAFc9Ft2vb4WfRprm9RiohT7WEyU/G+nACderaIDE12B4/CtC3l64QPWxN
 uJydQ4io92qkCMOCXBupGmwUvCCkwB+acTSLRUgKd/IEbp8cTrnOgNpgJmB6TLXY
 fj1UO6pi+fp9yXdyWwrDCqsvlrXbmDu25Sqy1CVEA/iApC5mFwFaEvLl5eEhldSV
 +o2r6O7N3IOGsMjlAov7lp1wqUgqSaeOWRjFAeNxs5lc+G4Cts27x9XMvpKPNUON
 pCAs9C+hdpcIS/ZAdpdO0JVashK6rVIP0oaUBRkTT4kKz5E6TUXbhJ1tUPpzJT0j
 98jYQOJmBhQfAfTuN54rpciv5NUA1b/KpV17BothpL6Npe0WYjS037fcwfj8u1DH
 T+2NjqZLYUkhzwzU3sDokRJcjCm/Wq2qv2aON/6CQR9LCdIJFKoWc5i7a5/v3Rm5
 xXUQgCEPzJ9kzqQguZjn/fQnnMxgK++sYiJP+TKPNxyYn4LlJ+UQBk0/dazLKQtd
 dEN+zzo=
 =lBzh
 -----END PGP SIGNATURE-----

Merge tag 'sound-4.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "We have a core fix in the compat code for covering a potential race
  (double references), but it's a very minor change.

  The rest are all small device-specific quirks, as well as a correction
  of the new UAC3 support code"

* tag 'sound-4.17-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: usb-audio: Use Class Specific EP for UAC3 devices.
  ALSA: hda/realtek - Clevo P950ER ALC1220 Fixup
  ALSA: usb: mixer: volume quirk for CM102-A+/102S+
  ALSA: hda: Add Lenovo C50 All in one to the power_save blacklist
  ALSA: control: fix a redundant-copy issue
2018-05-17 10:13:44 -07:00
Michael S. Tsirkin
633711e828 kvm: rename KVM_HINTS_DEDICATED to KVM_HINTS_REALTIME
KVM_HINTS_DEDICATED seems to be somewhat confusing:

Guest doesn't really care whether it's the only task running on a host
CPU as long as it's not preempted.

And there are more reasons for Guest to be preempted than host CPU
sharing, for example, with memory overcommit it can get preempted on a
memory access, post copy migration can cause preemption, etc.

Let's call it KVM_HINTS_REALTIME which seems to better
match what guests expect.

Also, the flag most be set on all vCPUs - current guests assume this.
Note so in the documentation.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-05-17 19:12:13 +02:00
Linus Torvalds
3e9245c5fa Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Martin Schwidefsky:

 - a fix for the vfio ccw translation code

 - update an incorrect email address in the MAINTAINERS file

 - fix a division by zero oops in the cpum_sf code found by trinity

 - two fixes for the error handling of the qdio code

 - several spectre related patches to convert all left-over indirect
   branches in the kernel to expoline branches

 - update defconfigs to avoid warnings due to the netfilter Kconfig
   changes

 - avoid several compiler warnings in the kexec_file code for s390

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/qdio: don't release memory in qdio_setup_irq()
  s390/qdio: fix access to uninitialized qdio_q fields
  s390/cpum_sf: ensure sample frequency of perf event attributes is non-zero
  s390: use expoline thunks in the BPF JIT
  s390: extend expoline to BC instructions
  s390: remove indirect branch from do_softirq_own_stack
  s390: move spectre sysfs attribute code
  s390/kernel: use expoline for indirect branches
  s390/ftrace: use expoline for indirect branches
  s390/lib: use expoline for indirect branches
  s390/crc32-vx: use expoline for indirect branches
  s390: move expoline assembler macros to a header
  vfio: ccw: fix cleanup if cp_prefetch fails
  s390/kexec_file: add declaration of purgatory related globals
  s390: update defconfigs
  MAINTAINERS: update s390 zcrypt maintainers email address
2018-05-17 10:11:44 -07:00
Linus Torvalds
305bb55212 selinux/stable-4.17 PR 20180516
-----BEGIN PGP SIGNATURE-----
 
 iQJIBAABCAAyFiEEcQCq365ubpQNLgrWVeRaWujKfIoFAlr8kO8UHHBhdWxAcGF1
 bC1tb29yZS5jb20ACgkQVeRaWujKfIrEtg/5AWIHjkXWgUnwtG+zswaZmzXRCIHi
 Ixz/R7gDLBstLDORr0mZ19sllo9iQfiFfeKQL+8ewn5CM7vGViASBDrbscsU9QDI
 imy5PLcJ4iVRcLhpgKCQWrz2kE3lIkK1UlpMTnsHR7wXeLrTKF4bSI/Rdyu6jApB
 VnyOaeTp3BUKpY5mKURVP+N8jG/MF/kCx94lNlsBnVmPkbI8A8wALyZPZt9D7YRu
 3FGRQQ9FM0HTGTplnfvDLoEH97Dk4MRTGaKpHj/kKuqviQDpf/JH6/fk1nQDgHkW
 Mzj6YbMZddee7TDbhmmyvymaYNqcjbRiOiPBEodoDMHcN9Cba7gvtGA0J4/WSLaz
 ZdVUdqG1E0P3qsda4/pf1FLDTXOtwmxk0J/fwOixnfnVIvb/mUGzJrxb2HqXQBjH
 Mycd260b4LmZg1XSkAiBvF6XLanOx3VZHTMg5rsMgM2lZ8o7mH3nWwbEhy9qIuHp
 gSq63NU/X43pB8dfGVxWvVKild2uA2wKO4Kl6hZ0DW4VdM5423qz67aYy38EIguk
 cEvTGrFBqZy5ib1XzXSYjMsmHRZQAU2SDI4g6gjSTjK+WnzaUgliFN0EyS7IIK1c
 us1gYIPa3LrQ7giUsCqyKAcp08tHSAHYw6z1vHS1tlu447EkTX6QzO99dMPtMzWd
 69zSUhOtbYamaiA=
 =SSWK
 -----END PGP SIGNATURE-----

Merge tag 'selinux-pr-20180516' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull SELinux fixes from Paul Moore:
 "A small pull request to fix a few regressions in the SELinux/SCTP code
  with applications that call bind() with AF_UNSPEC/INADDR_ANY.

  The individual commit descriptions have more information, but the
  commits themselves should be self explanatory"

* tag 'selinux-pr-20180516' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: correctly handle sa_family cases in selinux_sctp_bind_connect()
  selinux: fix address family in bind() and connect() to match address/port
  selinux: add AF_UNSPEC and INADDR_ANY checks to selinux_socket_bind()
2018-05-17 10:02:19 -07:00
Willy Tarreau
7f7ccc2ccc proc: do not access cmdline nor environ from file-backed areas
proc_pid_cmdline_read() and environ_read() directly access the target
process' VM to retrieve the command line and environment. If this
process remaps these areas onto a file via mmap(), the requesting
process may experience various issues such as extra delays if the
underlying device is slow to respond.

Let's simply refuse to access file-backed areas in these functions.
For this we add a new FOLL_ANON gup flag that is passed to all calls
to access_remote_vm(). The code already takes care of such failures
(including unmapped areas). Accesses via /proc/pid/mem were not
changed though.

This was assigned CVE-2018-1120.

Note for stable backports: the patch may apply to kernels prior to 4.11
but silently miss one location; it must be checked that no call to
access_remote_vm() keeps zero as the last argument.

Reported-by: Qualys Security Advisory <qsa@qualys.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-05-17 09:27:47 -07:00
Coly Li
1c1a2ee1b5 bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n
Commit 539d39eb2708 ("bcache: fix wrong return value in bch_debug_init()")
returns the return value of debugfs_create_dir() to bcache_init(). When
CONFIG_DEBUG_FS=n, bch_debug_init() always returns 1 and makes
bcache_init() failedi.

This patch makes bch_debug_init() always returns 0 if CONFIG_DEBUG_FS=n,
so bcache can continue to work for the kernels which don't have debugfs
enanbled.

Changelog:
v4: Add Acked-by from Kent Overstreet.
v3: Use IS_ENABLED(CONFIG_DEBUG_FS) to replace #ifdef DEBUG_FS.
v2: Remove a warning information
v1: Initial version.

Fixes: Commit 539d39eb2708 ("bcache: fix wrong return value in bch_debug_init()")
Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <colyli@suse.de>
Reported-by: Massimo B. <massimo.b@gmx.net>
Reported-by: Kai Krakow <kai@kaishome.de>
Tested-by: Kai Krakow <kai@kaishome.de>
Acked-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-05-17 09:43:40 -06:00
Tom Lendacky
bc226f07dc KVM: SVM: Implement VIRT_SPEC_CTRL support for SSBD
Expose the new virtualized architectural mechanism, VIRT_SSBD, for using
speculative store bypass disable (SSBD) under SVM.  This will allow guests
to use SSBD on hardware that uses non-architectural mechanisms for enabling
SSBD.

[ tglx: Folded the migration fixup from Paolo Bonzini ]

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2018-05-17 17:09:21 +02:00
Thomas Gleixner
47c61b3955 x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG
Add the necessary logic for supporting the emulated VIRT_SPEC_CTRL MSR to
x86_virt_spec_ctrl().  If either X86_FEATURE_LS_CFG_SSBD or
X86_FEATURE_VIRT_SPEC_CTRL is set then use the new guest_virt_spec_ctrl
argument to check whether the state must be modified on the host. The
update reuses speculative_store_bypass_update() so the ZEN-specific sibling
coordination can be reused.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2018-05-17 17:09:21 +02:00
Thomas Gleixner
be6fcb5478 x86/bugs: Rework spec_ctrl base and mask logic
x86_spec_ctrL_mask is intended to mask out bits from a MSR_SPEC_CTRL value
which are not to be modified. However the implementation is not really used
and the bitmask was inverted to make a check easier, which was removed in
"x86/bugs: Remove x86_spec_ctrl_set()"

Aside of that it is missing the STIBP bit if it is supported by the
platform, so if the mask would be used in x86_virt_spec_ctrl() then it
would prevent a guest from setting STIBP.

Add the STIBP bit if supported and use the mask in x86_virt_spec_ctrl() to
sanitize the value which is supplied by the guest.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
2018-05-17 17:09:20 +02:00
Thomas Gleixner
4b59bdb569 x86/bugs: Remove x86_spec_ctrl_set()
x86_spec_ctrl_set() is only used in bugs.c and the extra mask checks there
provide no real value as both call sites can just write x86_spec_ctrl_base
to MSR_SPEC_CTRL. x86_spec_ctrl_base is valid and does not need any extra
masking or checking.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:20 +02:00
Thomas Gleixner
fa8ac49882 x86/bugs: Expose x86_spec_ctrl_base directly
x86_spec_ctrl_base is the system wide default value for the SPEC_CTRL MSR.
x86_spec_ctrl_get_default() returns x86_spec_ctrl_base and was intended to
prevent modification to that variable. Though the variable is read only
after init and globaly visible already.

Remove the function and export the variable instead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:19 +02:00
Borislav Petkov
cc69b34989 x86/bugs: Unify x86_spec_ctrl_{set_guest,restore_host}
Function bodies are very similar and are going to grow more almost
identical code. Add a bool arg to determine whether SPEC_CTRL is being set
for the guest or restored to the host.

No functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:19 +02:00
Thomas Gleixner
0270be3e34 x86/speculation: Rework speculative_store_bypass_update()
The upcoming support for the virtual SPEC_CTRL MSR on AMD needs to reuse
speculative_store_bypass_update() to avoid code duplication. Add an
argument for supplying a thread info (TIF) value and create a wrapper
speculative_store_bypass_update_current() which is used at the existing
call site.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:19 +02:00
Tom Lendacky
11fb068349 x86/speculation: Add virtualized speculative store bypass disable support
Some AMD processors only support a non-architectural means of enabling
speculative store bypass disable (SSBD).  To allow a simplified view of
this to a guest, an architectural definition has been created through a new
CPUID bit, 0x80000008_EBX[25], and a new MSR, 0xc001011f.  With this, a
hypervisor can virtualize the existence of this definition and provide an
architectural method for using SSBD to a guest.

Add the new CPUID feature, the new MSR and update the existing SSBD
support to use this MSR when present.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
2018-05-17 17:09:18 +02:00
Thomas Gleixner
ccbcd26744 x86/bugs, KVM: Extend speculation control for VIRT_SPEC_CTRL
AMD is proposing a VIRT_SPEC_CTRL MSR to handle the Speculative Store
Bypass Disable via MSR_AMD64_LS_CFG so that guests do not have to care
about the bit position of the SSBD bit and thus facilitate migration.
Also, the sibling coordination on Family 17H CPUs can only be done on
the host.

Extend x86_spec_ctrl_set_guest() and x86_spec_ctrl_restore_host() with an
extra argument for the VIRT_SPEC_CTRL MSR.

Hand in 0 from VMX and in SVM add a new virt_spec_ctrl member to the CPU
data structure which is going to be used in later patches for the actual
implementation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:18 +02:00
Thomas Gleixner
1f50ddb4f4 x86/speculation: Handle HT correctly on AMD
The AMD64_LS_CFG MSR is a per core MSR on Family 17H CPUs. That means when
hyperthreading is enabled the SSBD bit toggle needs to take both cores into
account. Otherwise the following situation can happen:

CPU0		CPU1

disable SSB
		disable SSB
		enable  SSB <- Enables it for the Core, i.e. for CPU0 as well

So after the SSB enable on CPU1 the task on CPU0 runs with SSB enabled
again.

On Intel the SSBD control is per core as well, but the synchronization
logic is implemented behind the per thread SPEC_CTRL MSR. It works like
this:

  CORE_SPEC_CTRL = THREAD0_SPEC_CTRL | THREAD1_SPEC_CTRL

i.e. if one of the threads enables a mitigation then this affects both and
the mitigation is only disabled in the core when both threads disabled it.

Add the necessary synchronization logic for AMD family 17H. Unfortunately
that requires a spinlock to serialize the access to the MSR, but the locks
are only shared between siblings.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:18 +02:00
Thomas Gleixner
d1035d9718 x86/cpufeatures: Add FEATURE_ZEN
Add a ZEN feature bit so family-dependent static_cpu_has() optimizations
can be built for ZEN.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:18 +02:00
Thomas Gleixner
52817587e7 x86/cpufeatures: Disentangle SSBD enumeration
The SSBD enumeration is similarly to the other bits magically shared
between Intel and AMD though the mechanisms are different.

Make X86_FEATURE_SSBD synthetic and set it depending on the vendor specific
features or family dependent setup.

Change the Intel bit to X86_FEATURE_SPEC_CTRL_SSBD to denote that SSBD is
controlled via MSR_SPEC_CTRL and fix up the usage sites.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:17 +02:00
Thomas Gleixner
7eb8956a7f x86/cpufeatures: Disentangle MSR_SPEC_CTRL enumeration from IBRS
The availability of the SPEC_CTRL MSR is enumerated by a CPUID bit on
Intel and implied by IBRS or STIBP support on AMD. That's just confusing
and in case an AMD CPU has IBRS not supported because the underlying
problem has been fixed but has another bit valid in the SPEC_CTRL MSR,
the thing falls apart.

Add a synthetic feature bit X86_FEATURE_MSR_SPEC_CTRL to denote the
availability on both Intel and AMD.

While at it replace the boot_cpu_has() checks with static_cpu_has() where
possible. This prevents late microcode loading from exposing SPEC_CTRL, but
late loading is already very limited as it does not reevaluate the
mitigation options and other bits and pieces. Having static_cpu_has() is
the simplest and least fragile solution.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2018-05-17 17:09:17 +02:00
Borislav Petkov
e7c587da12 x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP
Intel and AMD have different CPUID bits hence for those use synthetic bits
which get set on the respective vendor's in init_speculation_control(). So
that debacles like what the commit message of

  c65732e4f721 ("x86/cpu: Restore CPUID_8000_0008_EBX reload")

talks about don't happen anymore.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Jörg Otte <jrg.otte@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: https://lkml.kernel.org/r/20180504161815.GG9257@pd.tnic
2018-05-17 17:09:16 +02:00
Thomas Gleixner
15e6c22fd8 KVM: SVM: Move spec control call after restore of GS
svm_vcpu_run() invokes x86_spec_ctrl_restore_host() after VMEXIT, but
before the host GS is restored. x86_spec_ctrl_restore_host() uses 'current'
to determine the host SSBD state of the thread. 'current' is GS based, but
host GS is not yet restored and the access causes a triple fault.

Move the call after the host GS restore.

Fixes: 885f82bfbc6f x86/process: Allow runtime control of Speculative Store Bypass
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
2018-05-17 17:09:16 +02:00
Nicholas Piggin
c1d2a31397 powerpc/powernv: Fix NVRAM sleep in invalid context when crashing
Similarly to opal_event_shutdown, opal_nvram_write can be called in
the crash path with irqs disabled. Special case the delay to avoid
sleeping in invalid context.

Fixes: 3b8070335f75 ("powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops")
Cc: stable@vger.kernel.org # v3.2
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-05-18 00:23:07 +10:00
Pierre-Yves MORDRET
22aac3eb0c MAINTAINERS: add entry for STM32 I2C driver
Add I2C/SMBUS Driver entry for STM32 family from ST Microelectronics.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-05-17 16:02:19 +02:00
Michal Kubecek
8438ee76b0 Makefile: disable PIE before testing asm goto
Since commit e501ce957a78 ("x86: Force asm-goto"), aarch64 build on
distributions which enable PIE by default (e.g. openSUSE Tumbleweed) does
not detect support for asm goto correctly. The problem is that ARM specific
part of scripts/gcc-goto.sh fails with PIE even with recent gcc versions.
Moving the asm goto detection up in Makefile put it before the place where
we disable PIE. As a result, kernel is built without jump label support.

Move the lines disabling PIE before the asm goto test to make it work.

Fixes: e501ce957a78 ("x86: Force asm-goto")
Reported-by: Andreas Faerber <afaerber@suse.com>
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-05-17 22:36:40 +09:00
Nick Desaulniers
c64ba044ed kbuild: gcov: enable -fno-tree-loop-im if supported
Clang does not recognize this compiler option.

Reported-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-05-17 22:35:30 +09:00
Anand Jain
02ee654d3a btrfs: fix crash when trying to resume balance without the resume flag
We set the BTRFS_BALANCE_RESUME flag in the btrfs_recover_balance()
only, which isn't called during the remount. So when resuming from
the paused balance we hit the bug:

 kernel: kernel BUG at fs/btrfs/volumes.c:3890!
 ::
 kernel:  balance_kthread+0x51/0x60 [btrfs]
 kernel:  kthread+0x111/0x130
 ::
 kernel: RIP: btrfs_balance+0x12e1/0x1570 [btrfs] RSP: ffffba7d0090bde8

Reproducer:
  On a mounted filesystem:

  btrfs balance start --full-balance /btrfs
  btrfs balance pause /btrfs
  mount -o remount,ro /dev/sdb /btrfs
  mount -o remount,rw /dev/sdb /btrfs

To fix this set the BTRFS_BALANCE_RESUME flag in
btrfs_resume_balance_async().

CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-05-17 14:38:24 +02:00
Nikolay Borisov
fe816d0f1d btrfs: Fix delalloc inodes invalidation during transaction abort
When a transaction is aborted btrfs_cleanup_transaction is called to
cleanup all the various in-flight bits and pieces which migth be
active. One of those is delalloc inodes - inodes which have dirty
pages which haven't been persisted yet. Currently the process of
freeing such delalloc inodes in exceptional circumstances such as
transaction abort boiled down to calling btrfs_invalidate_inodes whose
sole job is to invalidate the dentries for all inodes related to a
root. This is in fact wrong and insufficient since such delalloc inodes
will likely have pending pages or ordered-extents and will be linked to
the sb->s_inode_list. This means that unmounting a btrfs instance with
an aborted transaction could potentially lead inodes/their pages
visible to the system long after their superblock has been freed. This
in turn leads to a "use-after-free" situation once page shrink is
triggered. This situation could be simulated by running generic/019
which would cause such inodes to be left hanging, followed by
generic/176 which causes memory pressure and page eviction which lead
to touching the freed super block instance. This situation is
additionally detected by the unmount code of VFS with the following
message:

"VFS: Busy inodes after unmount of Self-destruct in 5 seconds.  Have a nice day..."

Additionally btrfs hits WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
in free_fs_root for the same reason.

This patch aims to rectify the sitaution by doing the following:

1. Change btrfs_destroy_delalloc_inodes so that it calls
invalidate_inode_pages2 for every inode on the delalloc list, this
ensures that all the pages of the inode are released. This function
boils down to calling btrfs_releasepage. During test I observed cases
where inodes on the delalloc list were having an i_count of 0, so this
necessitates using igrab to be sure we are working on a non-freed inode.

2. Since calling btrfs_releasepage might queue delayed iputs move the
call out to btrfs_cleanup_transaction in btrfs_error_commit_super before
calling run_delayed_iputs for the last time. This is necessary to ensure
that delayed iputs are run.

Note: this patch is tagged for 4.14 stable but the fix applies to older
versions too but needs to be backported manually due to conflicts.

CC: stable@vger.kernel.org # 4.14.x: 2b8773313494: btrfs: Split btrfs_del_delalloc_inode into 2 functions
CC: stable@vger.kernel.org # 4.14.x
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add comment to igrab ]
Signed-off-by: David Sterba <dsterba@suse.com>
2018-05-17 14:38:18 +02:00
Nikolay Borisov
2b87733134 btrfs: Split btrfs_del_delalloc_inode into 2 functions
This is in preparation of fixing delalloc inodes leakage on transaction
abort. Also export the new function.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-05-17 14:18:26 +02:00