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Since commit 7969e5c40dfd ("ip: discard IPv4 datagrams with overlapping
segments.") IPv4 reassembly code drops the whole queue whenever an
overlapping fragment is received. However, the test is written in a way
which detects duplicate fragments as overlapping so that in environments
with many duplicate packets, fragmented packets may be undeliverable.
Add an extra test and for (potentially) duplicate fragment, only drop the
new fragment rather than the whole queue. Only starting offset and length
are checked, not the contents of the fragments as that would be too
expensive. For similar reason, linear list ("run") of a rbtree node is not
iterated, we only check if the new fragment is a subset of the interval
covered by existing consecutive fragments.
v2: instead of an exact check iterating through linear list of an rbtree
node, only check if the new fragment is subset of the "run" (suggested
by Eric Dumazet)
Fixes: 7969e5c40dfd ("ip: discard IPv4 datagrams with overlapping segments.")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The *_frag_reasm() functions are susceptible to miscalculating the byte
count of packet fragments in case the truesize of a head buffer changes.
The truesize member may be changed by the call to skb_unclone(), leaving
the fragment memory limit counter unbalanced even if all fragments are
processed. This miscalculation goes unnoticed as long as the network
namespace which holds the counter is not destroyed.
Should an attempt be made to destroy a network namespace that holds an
unbalanced fragment memory limit counter the cleanup of the namespace
never finishes. The thread handling the cleanup gets stuck in
inet_frags_exit_net() waiting for the percpu counter to reach zero. The
thread is usually in running state with a stacktrace similar to:
PID: 1073 TASK: ffff880626711440 CPU: 1 COMMAND: "kworker/u48:4"
#5 [ffff880621563d48] _raw_spin_lock at ffffffff815f5480
#6 [ffff880621563d48] inet_evict_bucket at ffffffff8158020b
#7 [ffff880621563d80] inet_frags_exit_net at ffffffff8158051c
#8 [ffff880621563db0] ops_exit_list at ffffffff814f5856
#9 [ffff880621563dd8] cleanup_net at ffffffff814f67c0
#10 [ffff880621563e38] process_one_work at ffffffff81096f14
It is not possible to create new network namespaces, and processes
that call unshare() end up being stuck in uninterruptible sleep state
waiting to acquire the net_mutex.
The bug was observed in the IPv6 netfilter code by Per Sundstrom.
I thank him for his analysis of the problem. The parts of this patch
that apply to IPv4 and IPv6 fragment reassembly are preemptive measures.
Signed-off-by: Jiri Wiesner <jwiesner@suse.com>
Reported-by: Per Sundstrom <per.sundstrom@redqube.se>
Acked-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Most callers of pskb_trim_rcsum() simply drop the skb when
it fails, however, ip_check_defrag() still continues to pass
the skb up to stack. This is suspicious.
In ip_check_defrag(), after we learn the skb is an IP fragment,
passing the skb to callers makes no sense, because callers expect
fragments are defrag'ed on success. So, dropping the skb when we
can't defrag it is reasonable.
Note, prior to commit 88078d98d1bb, this is not a big problem as
checksum will be fixed up anyway. After it, the checksum is not
correct on failure.
Found this during code review.
Fixes: 88078d98d1bb ("net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends")
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently, ip[6]frag_high_thresh sysctl values in new namespaces are
hard-limited to those of the root/init ns.
There are at least two use cases when it would be desirable to
set the high_thresh values higher in a child namespace vs the global hard
limit:
- a security/ddos protection policy may lower the thresholds in the
root/init ns but allow for a special exception in a child namespace
- testing: a test running in a namespace may want to set these
thresholds higher in its namespace than what is in the root/init ns
The new behavior:
# ip netns add testns
# ip netns exec testns bash
# sysctl -w net.ipv4.ipfrag_high_thresh=9000000
net.ipv4.ipfrag_high_thresh = 9000000
# sysctl net.ipv4.ipfrag_high_thresh
net.ipv4.ipfrag_high_thresh = 9000000
# sysctl -w net.ipv6.ip6frag_high_thresh=9000000
net.ipv6.ip6frag_high_thresh = 9000000
# sysctl net.ipv6.ip6frag_high_thresh
net.ipv6.ip6frag_high_thresh = 9000000
The old behavior:
# ip netns add testns
# ip netns exec testns bash
# sysctl -w net.ipv4.ipfrag_high_thresh=9000000
net.ipv4.ipfrag_high_thresh = 9000000
# sysctl net.ipv4.ipfrag_high_thresh
net.ipv4.ipfrag_high_thresh = 4194304
# sysctl -w net.ipv6.ip6frag_high_thresh=9000000
net.ipv6.ip6frag_high_thresh = 9000000
# sysctl net.ipv6.ip6frag_high_thresh
net.ipv6.ip6frag_high_thresh = 4194304
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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kfree_skb has taken the null pointer into account. hence it is safe
to remove the redundant null pointer check before kfree_skb.
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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An SKB is not on a list if skb->next is NULL.
Codify this convention into a helper function and use it
where we are dequeueing an SKB and need to mark it as such.
Signed-off-by: David S. Miller <davem@davemloft.net>
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A kernel crash occurrs when defragmented packet is fragmented
in ip_do_fragment().
In defragment routine, skb_orphan() is called and
skb->ip_defrag_offset is set. but skb->sk and
skb->ip_defrag_offset are same union member. so that
frag->sk is not NULL.
Hence crash occurrs in skb->sk check routine in ip_do_fragment() when
defragmented packet is fragmented.
test commands:
%iptables -t nat -I POSTROUTING -j MASQUERADE
%hping3 192.168.4.2 -s 1000 -p 2000 -d 60000
splat looks like:
[ 261.069429] kernel BUG at net/ipv4/ip_output.c:636!
[ 261.075753] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[ 261.083854] CPU: 1 PID: 1349 Comm: hping3 Not tainted 4.19.0-rc2+ #3
[ 261.100977] RIP: 0010:ip_do_fragment+0x1613/0x2600
[ 261.106945] Code: e8 e2 38 e3 fe 4c 8b 44 24 18 48 8b 74 24 08 e9 92 f6 ff ff 80 3c 02 00 0f 85 da 07 00 00 48 8b b5 d0 00 00 00 e9 25 f6 ff ff <0f> 0b 0f 0b 44 8b 54 24 58 4c 8b 4c 24 18 4c 8b 5c 24 60 4c 8b 6c
[ 261.127015] RSP: 0018:ffff8801031cf2c0 EFLAGS: 00010202
[ 261.134156] RAX: 1ffff1002297537b RBX: ffffed0020639e6e RCX: 0000000000000004
[ 261.142156] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880114ba9bd8
[ 261.150157] RBP: ffff880114ba8a40 R08: ffffed0022975395 R09: ffffed0022975395
[ 261.158157] R10: 0000000000000001 R11: ffffed0022975394 R12: ffff880114ba9ca4
[ 261.166159] R13: 0000000000000010 R14: ffff880114ba9bc0 R15: dffffc0000000000
[ 261.174169] FS: 00007fbae2199700(0000) GS:ffff88011b400000(0000) knlGS:0000000000000000
[ 261.183012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 261.189013] CR2: 00005579244fe000 CR3: 0000000119bf4000 CR4: 00000000001006e0
[ 261.198158] Call Trace:
[ 261.199018] ? dst_output+0x180/0x180
[ 261.205011] ? save_trace+0x300/0x300
[ 261.209018] ? ip_copy_metadata+0xb00/0xb00
[ 261.213034] ? sched_clock_local+0xd4/0x140
[ 261.218158] ? kill_l4proto+0x120/0x120 [nf_conntrack]
[ 261.223014] ? rt_cpu_seq_stop+0x10/0x10
[ 261.227014] ? find_held_lock+0x39/0x1c0
[ 261.233008] ip_finish_output+0x51d/0xb50
[ 261.237006] ? ip_fragment.constprop.56+0x220/0x220
[ 261.243011] ? nf_ct_l4proto_register_one+0x5b0/0x5b0 [nf_conntrack]
[ 261.250152] ? rcu_is_watching+0x77/0x120
[ 261.255010] ? nf_nat_ipv4_out+0x1e/0x2b0 [nf_nat_ipv4]
[ 261.261033] ? nf_hook_slow+0xb1/0x160
[ 261.265007] ip_output+0x1c7/0x710
[ 261.269005] ? ip_mc_output+0x13f0/0x13f0
[ 261.273002] ? __local_bh_enable_ip+0xe9/0x1b0
[ 261.278152] ? ip_fragment.constprop.56+0x220/0x220
[ 261.282996] ? nf_hook_slow+0xb1/0x160
[ 261.287007] raw_sendmsg+0x21f9/0x4420
[ 261.291008] ? dst_output+0x180/0x180
[ 261.297003] ? sched_clock_cpu+0x126/0x170
[ 261.301003] ? find_held_lock+0x39/0x1c0
[ 261.306155] ? stop_critical_timings+0x420/0x420
[ 261.311004] ? check_flags.part.36+0x450/0x450
[ 261.315005] ? _raw_spin_unlock_irq+0x29/0x40
[ 261.320995] ? _raw_spin_unlock_irq+0x29/0x40
[ 261.326142] ? cyc2ns_read_end+0x10/0x10
[ 261.330139] ? raw_bind+0x280/0x280
[ 261.334138] ? sched_clock_cpu+0x126/0x170
[ 261.338995] ? check_flags.part.36+0x450/0x450
[ 261.342991] ? __lock_acquire+0x4500/0x4500
[ 261.348994] ? inet_sendmsg+0x11c/0x500
[ 261.352989] ? dst_output+0x180/0x180
[ 261.357012] inet_sendmsg+0x11c/0x500
[ ... ]
v2:
- clear skb->sk at reassembly routine.(Eric Dumarzet)
Fixes: fa0f527358bd ("ip: use rb trees for IP frag queue.")
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The current behavior of IP defragmentation is inconsistent:
- some overlapping/wrong length fragments are dropped without
affecting the queue;
- most overlapping fragments cause the whole frag queue to be dropped.
This patch brings consistency: if a bad fragment is detected,
the whole frag queue is dropped. Two major benefits:
- fail fast: corrupted frag queues are cleared immediately, instead of
by timeout;
- testing of overlapping fragments is now much easier: any kind of
random fragment length mutation now leads to the frag queue being
discarded (IP packet dropped); before this patch, some overlaps were
"corrected", with tests not seeing expected packet drops.
Note that in one case (see "if (end&7)" conditional) the current
behavior is preserved as there are concerns that this could be
legitimate padding.
Signed-off-by: Peter Oskolkov <posk@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch changes the runtime behavior of IP defrag queue:
incoming in-order fragments are added to the end of the current
list/"run" of in-order fragments at the tail.
On some workloads, UDP stream performance is substantially improved:
RX: ./udp_stream -F 10 -T 2 -l 60
TX: ./udp_stream -c -H <host> -F 10 -T 5 -l 60
with this patchset applied on a 10Gbps receiver:
throughput=9524.18
throughput_units=Mbit/s
upstream (net-next):
throughput=4608.93
throughput_units=Mbit/s
Reported-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch introduces several helper functions/macros that will be
used in the follow-up patch. No runtime changes yet.
The new logic (fully implemented in the second patch) is as follows:
* Nodes in the rb-tree will now contain not single fragments, but lists
of consecutive fragments ("runs").
* At each point in time, the current "active" run at the tail is
maintained/tracked. Fragments that arrive in-order, adjacent
to the previous tail fragment, are added to this tail run without
triggering the re-balancing of the rb-tree.
* If a fragment arrives out of order with the offset _before_ the tail run,
it is inserted into the rb-tree as a single fragment.
* If a fragment arrives after the current tail fragment (with a gap),
it starts a new "tail" run, as is inserted into the rb-tree
at the end as the head of the new run.
skb->cb is used to store additional information
needed here (suggested by Eric Dumazet).
Reported-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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We accidentally removed the parentheses here, but they are required
because '!' has higher precedence than '&'.
Fixes: fa0f527358bd ("ip: use rb trees for IP frag queue.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Similar to TCP OOO RX queue, it makes sense to use rb trees to store
IP fragments, so that OOO fragments are inserted faster.
Tested:
- a follow-up patch contains a rather comprehensive ip defrag
self-test (functional)
- ran neper `udp_stream -c -H <host> -F 100 -l 300 -T 20`:
netstat --statistics
Ip:
282078937 total packets received
0 forwarded
0 incoming packets discarded
946760 incoming packets delivered
18743456 requests sent out
101 fragments dropped after timeout
282077129 reassemblies required
944952 packets reassembled ok
262734239 packet reassembles failed
(The numbers/stats above are somewhat better re:
reassemblies vs a kernel without this patchset. More
comprehensive performance testing TBD).
Reported-by: Jann Horn <jannh@google.com>
Reported-by: Juha-Matti Tilli <juha-matti.tilli@iki.fi>
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This behavior is required in IPv6, and there is little need
to tolerate overlapping fragments in IPv4. This change
simplifies the code and eliminates potential DDoS attack vectors.
Tested: ran ip_defrag selftest (not yet available uptream).
Suggested-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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ip_frag_queue() might call pskb_pull() on one skb that
is already in the fragment queue.
We need to take care of possible truesize change, or we
might have an imbalance of the netns frags memory usage.
IPv6 is immune to this bug, because RFC5722, Section 4,
amended by Errata ID 3089 states :
When reassembling an IPv6 datagram, if
one or more its constituent fragments is determined to be an
overlapping fragment, the entire datagram (and any constituent
fragments) MUST be silently discarded.
Fixes: 158f323b9868 ("net: adjust skb->truesize in pskb_expand_head()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Giving an integer to proc_doulongvec_minmax() is dangerous on 64bit arches,
since linker might place next to it a non zero value preventing a change
to ip6frag_low_thresh.
ip6frag_low_thresh is not used anymore in the kernel, but we do not
want to prematuraly break user scripts wanting to change it.
Since specifying a minimal value of 0 for proc_doulongvec_minmax()
is moot, let's remove these zero values in all defrag units.
Fixes: 6e00f7dd5e4e ("ipv6: frags: fix /proc/sys/net/ipv6/ip6frag_low_thresh")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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ip_defrag uses skb->cb[] to store the fragment offset, and unfortunately
this integer is currently in a different cache line than skb->next,
meaning that we use two cache lines per skb when finding the insertion point.
By aliasing skb->ip_defrag_offset and skb->dev, we pack all the fields
in a single cache line and save precious memory bandwidth.
Note that after the fast path added by Changli Gao in commit
d6bebca92c66 ("fragment: add fast path for in-order fragments")
this change wont help the fast path, since we still need
to access prev->len (2nd cache line), but will show great
benefits when slow path is entered, since we perform
a linear scan of a potentially long list.
Also, note that this potential long list is an attack vector,
we might consider also using an rb-tree there eventually.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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An skb_clone() was added in commit ec4fbd64751d ("inet: frag: release
spinlock before calling icmp_send()")
While fixing the bug at that time, it also added a very high cost
for DDOS frags, as the ICMP rate limit is applied after this
expensive operation (skb_clone() + consume_skb(), implying memory
allocations, copy, and freeing)
We can use skb_get(head) here, all we want is to make sure skb wont
be freed by another cpu.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Some users are willing to provision huge amounts of memory to be able
to perform reassembly reasonnably well under pressure.
Current memory tracking is using one atomic_t and integers.
Switch to atomic_long_t so that 64bit arches can use more than 2GB,
without any cost for 32bit arches.
Note that this patch avoids an overflow error, if high_thresh was set
to ~2GB, since this test in inet_frag_alloc() was never true :
if (... || frag_mem_limit(nf) > nf->high_thresh)
Tested:
$ echo 16000000000 >/proc/sys/net/ipv4/ipfrag_high_thresh
<frag DDOS>
$ grep FRAG /proc/net/sockstat
FRAG: inuse 14705885 memory 16000002880
$ nstat -n ; sleep 1 ; nstat | grep Reas
IpReasmReqds 3317150 0.0
IpReasmFails 3317112 0.0
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This function is obsolete, after rhashtable addition to inet defrag.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This refactors ip_expire() since one indentation level is removed.
Note: in the future, we should try hard to avoid the skb_clone()
since this is a serious performance cost.
Under DDOS, the ICMP message wont be sent because of rate limits.
Fact that ip6_expire_frag_queue() does not use skb_clone() is
disturbing too. Presumably IPv6 should have the same
issue than the one we fixed in commit ec4fbd64751d
("inet: frag: release spinlock before calling icmp_send()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Remove sum_frag_mem_limit(), ip_frag_mem() & ip6_frag_mem()
Also since we use rhashtable we can bring back the number of fragments
in "grep FRAG /proc/net/sockstat /proc/net/sockstat6" that was
removed in commit 434d305405ab ("inet: frag: don't account number
of fragment queues")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Some applications still rely on IP fragmentation, and to be fair linux
reassembly unit is not working under any serious load.
It uses static hash tables of 1024 buckets, and up to 128 items per bucket (!!!)
A work queue is supposed to garbage collect items when host is under memory
pressure, and doing a hash rebuild, changing seed used in hash computations.
This work queue blocks softirqs for up to 25 ms when doing a hash rebuild,
occurring every 5 seconds if host is under fire.
Then there is the problem of sharing this hash table for all netns.
It is time to switch to rhashtables, and allocate one of them per netns
to speedup netns dismantle, since this is a critical metric these days.
Lookup is now using RCU. A followup patch will even remove
the refcount hold/release left from prior implementation and save
a couple of atomic operations.
Before this patch, 16 cpus (16 RX queue NIC) could not handle more
than 1 Mpps frags DDOS.
After the patch, I reach 9 Mpps without any tuning, and can use up to 2GB
of storage for the fragments (exact number depends on frags being evicted
after timeout)
$ grep FRAG /proc/net/sockstat
FRAG: inuse 1966916 memory 2140004608
A followup patch will change the limits for 64bit arches.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Florian Westphal <fw@strlen.de>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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We need to call inet_frags_init() before register_pernet_subsys(),
as a prereq for following patch ("inet: frags: use rhashtables for reassembly units")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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In order to simplify the API, add a pointer to struct inet_frags.
This will allow us to make things less complex.
These functions no longer have a struct inet_frags parameter :
inet_frag_destroy(struct inet_frag_queue *q /*, struct inet_frags *f */)
inet_frag_put(struct inet_frag_queue *q /*, struct inet_frags *f */)
inet_frag_kill(struct inet_frag_queue *q /*, struct inet_frags *f */)
inet_frags_exit_net(struct netns_frags *nf /*, struct inet_frags *f */)
ip6_expire_frag_queue(struct net *net, struct frag_queue *fq)
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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We will soon initialize one rhashtable per struct netns_frags
in inet_frags_init_net().
This patch changes the return value to eventually propagate an
error.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Synchronous pernet_operations are not allowed anymore.
All are asynchronous. So, drop the structure member.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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arp_net_ops just addr/removes /proc entry.
devinet_ops allocates and frees duplicate of init_net tables
and (un)registers sysctl entries.
fib_net_ops allocates and frees pernet tables, creates/destroys
netlink socket and (un)initializes /proc entries. Foreign
pernet_operations do not touch them.
ip_rt_proc_ops only modifies pernet /proc entries.
xfrm_net_ops creates/destroys /proc entries, allocates/frees
pernet statistics, hashes and tables, and (un)initializes
sysctl files. These are not touched by foreigh pernet_operations
xfrm4_net_ops allocates/frees private pernet memory, and
configures sysctls.
sysctl_route_ops creates/destroys sysctls.
rt_genid_ops only initializes fields of just allocated net.
ipv4_inetpeer_ops allocated/frees net private memory.
igmp_net_ops just creates/destroys /proc files and socket,
noone else interested in.
tcp_sk_ops seems to be safe, because tcp_sk_init() does not
depend on any other pernet_operations modifications. Iteration
over hash table in inet_twsk_purge() is made under RCU lock,
and it's safe to iterate the table this way. Removing from
the table happen from inet_twsk_deschedule_put(), but this
function is safe without any extern locks, as it's synchronized
inside itself. There are many examples, it's used in different
context. So, it's safe to leave tcp_sk_exit_batch() unlocked.
tcp_net_metrics_ops is synchronized on tcp_metrics_lock and safe.
udplite4_net_ops only creates/destroys pernet /proc file.
icmp_sk_ops creates percpu sockets, not touched by foreign
pernet_operations.
ipmr_net_ops creates/destroys pernet fib tables, (un)registers
fib rules and /proc files. This seem to be safe to execute
in parallel with foreign pernet_operations.
af_inet_ops just sets up default parameters of newly created net.
ipv4_mib_ops creates and destroys pernet percpu statistics.
raw_net_ops, tcp4_net_ops, udp4_net_ops, ping_v4_net_ops
and ip_proc_ops only create/destroy pernet /proc files.
ip4_frags_ops creates and destroys sysctl file.
So, it's safe to make the pernet_operations async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Files removed in 'net-next' had their license header updated
in 'net'. We take the remove from 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.
Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@osg.samsung.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: Florian Westphal <fw@strlen.de>
Cc: linux-wpan@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Stefan Schmidt <stefan@osg.samsung.com> # for ieee802154
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
This reverts commit 1d6119baf0610f813eb9d9580eb4fd16de5b4ceb.
After reverting commit 6d7b857d541e ("net: use lib/percpu_counter API
for fragmentation mem accounting") then here is no need for this
fix-up patch. As percpu_counter is no longer used, it cannot
memory leak it any-longer.
Fixes: 6d7b857d541e ("net: use lib/percpu_counter API for fragmentation mem accounting")
Fixes: 1d6119baf061 ("net: fix percpu memory leaks")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
Dmitry reported a lockdep splat [1] (false positive) that we can fix
by releasing the spinlock before calling icmp_send() from ip_expire()
This is a false positive because sending an ICMP message can not
possibly re-enter the IP frag engine.
[1]
[ INFO: possible circular locking dependency detected ]
4.10.0+ #29 Not tainted
-------------------------------------------------------
modprobe/12392 is trying to acquire lock:
(_xmit_ETHER#2){+.-...}, at: [<ffffffff837a8182>] spin_lock
include/linux/spinlock.h:299 [inline]
(_xmit_ETHER#2){+.-...}, at: [<ffffffff837a8182>] __netif_tx_lock
include/linux/netdevice.h:3486 [inline]
(_xmit_ETHER#2){+.-...}, at: [<ffffffff837a8182>]
sch_direct_xmit+0x282/0x6d0 net/sched/sch_generic.c:180
but task is already holding lock:
(&(&q->lock)->rlock){+.-...}, at: [<ffffffff8389a4d1>] spin_lock
include/linux/spinlock.h:299 [inline]
(&(&q->lock)->rlock){+.-...}, at: [<ffffffff8389a4d1>]
ip_expire+0x51/0x6c0 net/ipv4/ip_fragment.c:201
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&(&q->lock)->rlock){+.-...}:
validate_chain kernel/locking/lockdep.c:2267 [inline]
__lock_acquire+0x2149/0x3430 kernel/locking/lockdep.c:3340
lock_acquire+0x2a1/0x630 kernel/locking/lockdep.c:3755
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x33/0x50 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:299 [inline]
ip_defrag+0x3a2/0x4130 net/ipv4/ip_fragment.c:669
ip_check_defrag+0x4e3/0x8b0 net/ipv4/ip_fragment.c:713
packet_rcv_fanout+0x282/0x800 net/packet/af_packet.c:1459
deliver_skb net/core/dev.c:1834 [inline]
dev_queue_xmit_nit+0x294/0xa90 net/core/dev.c:1890
xmit_one net/core/dev.c:2903 [inline]
dev_hard_start_xmit+0x16b/0xab0 net/core/dev.c:2923
sch_direct_xmit+0x31f/0x6d0 net/sched/sch_generic.c:182
__dev_xmit_skb net/core/dev.c:3092 [inline]
__dev_queue_xmit+0x13e5/0x1e60 net/core/dev.c:3358
dev_queue_xmit+0x17/0x20 net/core/dev.c:3423
neigh_resolve_output+0x6b9/0xb10 net/core/neighbour.c:1308
neigh_output include/net/neighbour.h:478 [inline]
ip_finish_output2+0x8b8/0x15a0 net/ipv4/ip_output.c:228
ip_do_fragment+0x1d93/0x2720 net/ipv4/ip_output.c:672
ip_fragment.constprop.54+0x145/0x200 net/ipv4/ip_output.c:545
ip_finish_output+0x82d/0xe10 net/ipv4/ip_output.c:314
NF_HOOK_COND include/linux/netfilter.h:246 [inline]
ip_output+0x1f0/0x7a0 net/ipv4/ip_output.c:404
dst_output include/net/dst.h:486 [inline]
ip_local_out+0x95/0x170 net/ipv4/ip_output.c:124
ip_send_skb+0x3c/0xc0 net/ipv4/ip_output.c:1492
ip_push_pending_frames+0x64/0x80 net/ipv4/ip_output.c:1512
raw_sendmsg+0x26de/0x3a00 net/ipv4/raw.c:655
inet_sendmsg+0x164/0x5b0 net/ipv4/af_inet.c:761
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:643
___sys_sendmsg+0x4a3/0x9f0 net/socket.c:1985
__sys_sendmmsg+0x25c/0x750 net/socket.c:2075
SYSC_sendmmsg net/socket.c:2106 [inline]
SyS_sendmmsg+0x35/0x60 net/socket.c:2101
do_syscall_64+0x2e8/0x930 arch/x86/entry/common.c:281
return_from_SYSCALL_64+0x0/0x7a
-> #0 (_xmit_ETHER#2){+.-...}:
check_prev_add kernel/locking/lockdep.c:1830 [inline]
check_prevs_add+0xa8f/0x19f0 kernel/locking/lockdep.c:1940
validate_chain kernel/locking/lockdep.c:2267 [inline]
__lock_acquire+0x2149/0x3430 kernel/locking/lockdep.c:3340
lock_acquire+0x2a1/0x630 kernel/locking/lockdep.c:3755
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x33/0x50 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:299 [inline]
__netif_tx_lock include/linux/netdevice.h:3486 [inline]
sch_direct_xmit+0x282/0x6d0 net/sched/sch_generic.c:180
__dev_xmit_skb net/core/dev.c:3092 [inline]
__dev_queue_xmit+0x13e5/0x1e60 net/core/dev.c:3358
dev_queue_xmit+0x17/0x20 net/core/dev.c:3423
neigh_hh_output include/net/neighbour.h:468 [inline]
neigh_output include/net/neighbour.h:476 [inline]
ip_finish_output2+0xf6c/0x15a0 net/ipv4/ip_output.c:228
ip_finish_output+0xa29/0xe10 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:246 [inline]
ip_output+0x1f0/0x7a0 net/ipv4/ip_output.c:404
dst_output include/net/dst.h:486 [inline]
ip_local_out+0x95/0x170 net/ipv4/ip_output.c:124
ip_send_skb+0x3c/0xc0 net/ipv4/ip_output.c:1492
ip_push_pending_frames+0x64/0x80 net/ipv4/ip_output.c:1512
icmp_push_reply+0x372/0x4d0 net/ipv4/icmp.c:394
icmp_send+0x156c/0x1c80 net/ipv4/icmp.c:754
ip_expire+0x40e/0x6c0 net/ipv4/ip_fragment.c:239
call_timer_fn+0x241/0x820 kernel/time/timer.c:1268
expire_timers kernel/time/timer.c:1307 [inline]
__run_timers+0x960/0xcf0 kernel/time/timer.c:1601
run_timer_softirq+0x21/0x80 kernel/time/timer.c:1614
__do_softirq+0x31f/0xbe7 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1cc/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:657 [inline]
smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:962
apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:707
__read_once_size include/linux/compiler.h:254 [inline]
atomic_read arch/x86/include/asm/atomic.h:26 [inline]
rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:350 [inline]
__rcu_is_watching kernel/rcu/tree.c:1133 [inline]
rcu_is_watching+0x83/0x110 kernel/rcu/tree.c:1147
rcu_read_lock_held+0x87/0xc0 kernel/rcu/update.c:293
radix_tree_deref_slot include/linux/radix-tree.h:238 [inline]
filemap_map_pages+0x6d4/0x1570 mm/filemap.c:2335
do_fault_around mm/memory.c:3231 [inline]
do_read_fault mm/memory.c:3265 [inline]
do_fault+0xbd5/0x2080 mm/memory.c:3370
handle_pte_fault mm/memory.c:3600 [inline]
__handle_mm_fault+0x1062/0x2cb0 mm/memory.c:3714
handle_mm_fault+0x1e2/0x480 mm/memory.c:3751
__do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1397
do_page_fault+0x54/0x70 arch/x86/mm/fault.c:1460
page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1011
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&q->lock)->rlock);
lock(_xmit_ETHER#2);
lock(&(&q->lock)->rlock);
lock(_xmit_ETHER#2);
*** DEADLOCK ***
10 locks held by modprobe/12392:
#0: (&mm->mmap_sem){++++++}, at: [<ffffffff81329758>]
__do_page_fault+0x2b8/0xb60 arch/x86/mm/fault.c:1336
#1: (rcu_read_lock){......}, at: [<ffffffff8188cab6>]
filemap_map_pages+0x1e6/0x1570 mm/filemap.c:2324
#2: (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff81984a78>]
spin_lock include/linux/spinlock.h:299 [inline]
#2: (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff81984a78>]
pte_alloc_one_map mm/memory.c:2944 [inline]
#2: (&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff81984a78>]
alloc_set_pte+0x13b8/0x1b90 mm/memory.c:3072
#3: (((&q->timer))){+.-...}, at: [<ffffffff81627e72>]
lockdep_copy_map include/linux/lockdep.h:175 [inline]
#3: (((&q->timer))){+.-...}, at: [<ffffffff81627e72>]
call_timer_fn+0x1c2/0x820 kernel/time/timer.c:1258
#4: (&(&q->lock)->rlock){+.-...}, at: [<ffffffff8389a4d1>] spin_lock
include/linux/spinlock.h:299 [inline]
#4: (&(&q->lock)->rlock){+.-...}, at: [<ffffffff8389a4d1>]
ip_expire+0x51/0x6c0 net/ipv4/ip_fragment.c:201
#5: (rcu_read_lock){......}, at: [<ffffffff8389a633>]
ip_expire+0x1b3/0x6c0 net/ipv4/ip_fragment.c:216
#6: (slock-AF_INET){+.-...}, at: [<ffffffff839b3313>] spin_trylock
include/linux/spinlock.h:309 [inline]
#6: (slock-AF_INET){+.-...}, at: [<ffffffff839b3313>] icmp_xmit_lock
net/ipv4/icmp.c:219 [inline]
#6: (slock-AF_INET){+.-...}, at: [<ffffffff839b3313>]
icmp_send+0x803/0x1c80 net/ipv4/icmp.c:681
#7: (rcu_read_lock_bh){......}, at: [<ffffffff838ab9a1>]
ip_finish_output2+0x2c1/0x15a0 net/ipv4/ip_output.c:198
#8: (rcu_read_lock_bh){......}, at: [<ffffffff836d1dee>]
__dev_queue_xmit+0x23e/0x1e60 net/core/dev.c:3324
#9: (dev->qdisc_running_key ?: &qdisc_running_key){+.....}, at:
[<ffffffff836d3a27>] dev_queue_xmit+0x17/0x20 net/core/dev.c:3423
stack backtrace:
CPU: 0 PID: 12392 Comm: modprobe Not tainted 4.10.0+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine,
BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x2ee/0x3ef lib/dump_stack.c:52
print_circular_bug+0x307/0x3b0 kernel/locking/lockdep.c:1204
check_prev_add kernel/locking/lockdep.c:1830 [inline]
check_prevs_add+0xa8f/0x19f0 kernel/locking/lockdep.c:1940
validate_chain kernel/locking/lockdep.c:2267 [inline]
__lock_acquire+0x2149/0x3430 kernel/locking/lockdep.c:3340
lock_acquire+0x2a1/0x630 kernel/locking/lockdep.c:3755
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x33/0x50 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:299 [inline]
__netif_tx_lock include/linux/netdevice.h:3486 [inline]
sch_direct_xmit+0x282/0x6d0 net/sched/sch_generic.c:180
__dev_xmit_skb net/core/dev.c:3092 [inline]
__dev_queue_xmit+0x13e5/0x1e60 net/core/dev.c:3358
dev_queue_xmit+0x17/0x20 net/core/dev.c:3423
neigh_hh_output include/net/neighbour.h:468 [inline]
neigh_output include/net/neighbour.h:476 [inline]
ip_finish_output2+0xf6c/0x15a0 net/ipv4/ip_output.c:228
ip_finish_output+0xa29/0xe10 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:246 [inline]
ip_output+0x1f0/0x7a0 net/ipv4/ip_output.c:404
dst_output include/net/dst.h:486 [inline]
ip_local_out+0x95/0x170 net/ipv4/ip_output.c:124
ip_send_skb+0x3c/0xc0 net/ipv4/ip_output.c:1492
ip_push_pending_frames+0x64/0x80 net/ipv4/ip_output.c:1512
icmp_push_reply+0x372/0x4d0 net/ipv4/icmp.c:394
icmp_send+0x156c/0x1c80 net/ipv4/icmp.c:754
ip_expire+0x40e/0x6c0 net/ipv4/ip_fragment.c:239
call_timer_fn+0x241/0x820 kernel/time/timer.c:1268
expire_timers kernel/time/timer.c:1307 [inline]
__run_timers+0x960/0xcf0 kernel/time/timer.c:1601
run_timer_softirq+0x21/0x80 kernel/time/timer.c:1614
__do_softirq+0x31f/0xbe7 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1cc/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:657 [inline]
smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:962
apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:707
RIP: 0010:__read_once_size include/linux/compiler.h:254 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:350 [inline]
RIP: 0010:__rcu_is_watching kernel/rcu/tree.c:1133 [inline]
RIP: 0010:rcu_is_watching+0x83/0x110 kernel/rcu/tree.c:1147
RSP: 0000:ffff8801c391f120 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: ffff8801c391f148 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000055edd4374000 RDI: ffff8801dbe1ae0c
RBP: ffff8801c391f1a0 R08: 0000000000000002 R09: 0000000000000000
R10: dffffc0000000000 R11: 0000000000000002 R12: 1ffff10038723e25
R13: ffff8801dbe1ae00 R14: ffff8801c391f680 R15: dffffc0000000000
</IRQ>
rcu_read_lock_held+0x87/0xc0 kernel/rcu/update.c:293
radix_tree_deref_slot include/linux/radix-tree.h:238 [inline]
filemap_map_pages+0x6d4/0x1570 mm/filemap.c:2335
do_fault_around mm/memory.c:3231 [inline]
do_read_fault mm/memory.c:3265 [inline]
do_fault+0xbd5/0x2080 mm/memory.c:3370
handle_pte_fault mm/memory.c:3600 [inline]
__handle_mm_fault+0x1062/0x2cb0 mm/memory.c:3714
handle_mm_fault+0x1e2/0x480 mm/memory.c:3751
__do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1397
do_page_fault+0x54/0x70 arch/x86/mm/fault.c:1460
page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1011
RIP: 0033:0x7f83172f2786
RSP: 002b:00007fffe859ae80 EFLAGS: 00010293
RAX: 000055edd4373040 RBX: 00007f83175111c8 RCX: 000055edd4373238
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f8317510970
RBP: 00007fffe859afd0 R08: 0000000000000009 R09: 0000000000000000
R10: 0000000000000064 R11: 0000000000000000 R12: 000055edd4373040
R13: 0000000000000000 R14: 00007fffe859afe8 R15: 0000000000000000
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Rename IP_INC_STATS_BH() to __IP_INC_STATS(), to
better express this is used in non preemptible context.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Now that all the ip fragmentation related sysctls are namespaceified
there is no reason to hide them anymore from "root" users inside
containers.
Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Later parts of the stack (including fragmentation) expect that there is
never a socket attached to frag in a frag_list, however this invariant
was not enforced on all defrag paths. This could lead to the
BUG_ON(skb->sk) during ip_do_fragment(), as per the call stack at the
end of this commit message.
While the call could be added to openvswitch to fix this particular
error, the head and tail of the frags list are already orphaned
indirectly inside ip_defrag(), so it seems like the remaining fragments
should all be orphaned in all circumstances.
kernel BUG at net/ipv4/ip_output.c:586!
[...]
Call Trace:
<IRQ>
[<ffffffffa0205270>] ? do_output.isra.29+0x1b0/0x1b0 [openvswitch]
[<ffffffffa02167a7>] ovs_fragment+0xcc/0x214 [openvswitch]
[<ffffffff81667830>] ? dst_discard_out+0x20/0x20
[<ffffffff81667810>] ? dst_ifdown+0x80/0x80
[<ffffffffa0212072>] ? find_bucket.isra.2+0x62/0x70 [openvswitch]
[<ffffffff810e0ba5>] ? mod_timer_pending+0x65/0x210
[<ffffffff810b732b>] ? __lock_acquire+0x3db/0x1b90
[<ffffffffa03205a2>] ? nf_conntrack_in+0x252/0x500 [nf_conntrack]
[<ffffffff810b63c4>] ? __lock_is_held+0x54/0x70
[<ffffffffa02051a3>] do_output.isra.29+0xe3/0x1b0 [openvswitch]
[<ffffffffa0206411>] do_execute_actions+0xe11/0x11f0 [openvswitch]
[<ffffffff810b63c4>] ? __lock_is_held+0x54/0x70
[<ffffffffa0206822>] ovs_execute_actions+0x32/0xd0 [openvswitch]
[<ffffffffa020b505>] ovs_dp_process_packet+0x85/0x140 [openvswitch]
[<ffffffff810b63c4>] ? __lock_is_held+0x54/0x70
[<ffffffffa02068a2>] ovs_execute_actions+0xb2/0xd0 [openvswitch]
[<ffffffffa020b505>] ovs_dp_process_packet+0x85/0x140 [openvswitch]
[<ffffffffa0215019>] ? ovs_ct_get_labels+0x49/0x80 [openvswitch]
[<ffffffffa0213a1d>] ovs_vport_receive+0x5d/0xa0 [openvswitch]
[<ffffffff810b732b>] ? __lock_acquire+0x3db/0x1b90
[<ffffffff810b732b>] ? __lock_acquire+0x3db/0x1b90
[<ffffffff810b732b>] ? __lock_acquire+0x3db/0x1b90
[<ffffffffa0214895>] ? internal_dev_xmit+0x5/0x140 [openvswitch]
[<ffffffffa02148fc>] internal_dev_xmit+0x6c/0x140 [openvswitch]
[<ffffffffa0214895>] ? internal_dev_xmit+0x5/0x140 [openvswitch]
[<ffffffff81660299>] dev_hard_start_xmit+0x2b9/0x5e0
[<ffffffff8165fc21>] ? netif_skb_features+0xd1/0x1f0
[<ffffffff81660f20>] __dev_queue_xmit+0x800/0x930
[<ffffffff81660770>] ? __dev_queue_xmit+0x50/0x930
[<ffffffff810b53f1>] ? mark_held_locks+0x71/0x90
[<ffffffff81669876>] ? neigh_resolve_output+0x106/0x220
[<ffffffff81661060>] dev_queue_xmit+0x10/0x20
[<ffffffff816698e8>] neigh_resolve_output+0x178/0x220
[<ffffffff816a8e6f>] ? ip_finish_output2+0x1ff/0x590
[<ffffffff816a8e6f>] ip_finish_output2+0x1ff/0x590
[<ffffffff816a8cee>] ? ip_finish_output2+0x7e/0x590
[<ffffffff816a9a31>] ip_do_fragment+0x831/0x8a0
[<ffffffff816a8c70>] ? ip_copy_metadata+0x1b0/0x1b0
[<ffffffff816a9ae3>] ip_fragment.constprop.49+0x43/0x80
[<ffffffff816a9c9c>] ip_finish_output+0x17c/0x340
[<ffffffff8169a6f4>] ? nf_hook_slow+0xe4/0x190
[<ffffffff816ab4c0>] ip_output+0x70/0x110
[<ffffffff816a9b20>] ? ip_fragment.constprop.49+0x80/0x80
[<ffffffff816aa9f9>] ip_local_out+0x39/0x70
[<ffffffff816abf89>] ip_send_skb+0x19/0x40
[<ffffffff816abfe3>] ip_push_pending_frames+0x33/0x40
[<ffffffff816df21a>] icmp_push_reply+0xea/0x120
[<ffffffff816df93d>] icmp_reply.constprop.23+0x1ed/0x230
[<ffffffff816df9ce>] icmp_echo.part.21+0x4e/0x50
[<ffffffff810b63c4>] ? __lock_is_held+0x54/0x70
[<ffffffff810d5f9e>] ? rcu_read_lock_held+0x5e/0x70
[<ffffffff816dfa06>] icmp_echo+0x36/0x70
[<ffffffff816e0d11>] icmp_rcv+0x271/0x450
[<ffffffff816a4ca7>] ip_local_deliver_finish+0x127/0x3a0
[<ffffffff816a4bc1>] ? ip_local_deliver_finish+0x41/0x3a0
[<ffffffff816a5160>] ip_local_deliver+0x60/0xd0
[<ffffffff816a4b80>] ? ip_rcv_finish+0x560/0x560
[<ffffffff816a46fd>] ip_rcv_finish+0xdd/0x560
[<ffffffff816a5453>] ip_rcv+0x283/0x3e0
[<ffffffff810b6302>] ? match_held_lock+0x192/0x200
[<ffffffff816a4620>] ? inet_del_offload+0x40/0x40
[<ffffffff8165d062>] __netif_receive_skb_core+0x392/0xae0
[<ffffffff8165e68e>] ? process_backlog+0x8e/0x230
[<ffffffff810b53f1>] ? mark_held_locks+0x71/0x90
[<ffffffff8165d7c8>] __netif_receive_skb+0x18/0x60
[<ffffffff8165e678>] process_backlog+0x78/0x230
[<ffffffff8165e6dd>] ? process_backlog+0xdd/0x230
[<ffffffff8165e355>] net_rx_action+0x155/0x400
[<ffffffff8106b48c>] __do_softirq+0xcc/0x420
[<ffffffff816a8e87>] ? ip_finish_output2+0x217/0x590
[<ffffffff8178e78c>] do_softirq_own_stack+0x1c/0x30
<EOI>
[<ffffffff8106b88e>] do_softirq+0x4e/0x60
[<ffffffff8106b948>] __local_bh_enable_ip+0xa8/0xb0
[<ffffffff816a8eb0>] ip_finish_output2+0x240/0x590
[<ffffffff816a9a31>] ? ip_do_fragment+0x831/0x8a0
[<ffffffff816a9a31>] ip_do_fragment+0x831/0x8a0
[<ffffffff816a8c70>] ? ip_copy_metadata+0x1b0/0x1b0
[<ffffffff816a9ae3>] ip_fragment.constprop.49+0x43/0x80
[<ffffffff816a9c9c>] ip_finish_output+0x17c/0x340
[<ffffffff8169a6f4>] ? nf_hook_slow+0xe4/0x190
[<ffffffff816ab4c0>] ip_output+0x70/0x110
[<ffffffff816a9b20>] ? ip_fragment.constprop.49+0x80/0x80
[<ffffffff816aa9f9>] ip_local_out+0x39/0x70
[<ffffffff816abf89>] ip_send_skb+0x19/0x40
[<ffffffff816abfe3>] ip_push_pending_frames+0x33/0x40
[<ffffffff816d55d3>] raw_sendmsg+0x7d3/0xc30
[<ffffffff810b732b>] ? __lock_acquire+0x3db/0x1b90
[<ffffffff816e7557>] ? inet_sendmsg+0xc7/0x1d0
[<ffffffff810b63c4>] ? __lock_is_held+0x54/0x70
[<ffffffff816e759a>] inet_sendmsg+0x10a/0x1d0
[<ffffffff816e7495>] ? inet_sendmsg+0x5/0x1d0
[<ffffffff8163e398>] sock_sendmsg+0x38/0x50
[<ffffffff8163ec5f>] ___sys_sendmsg+0x25f/0x270
[<ffffffff811aadad>] ? handle_mm_fault+0x8dd/0x1320
[<ffffffff8178c147>] ? _raw_spin_unlock+0x27/0x40
[<ffffffff810529b2>] ? __do_page_fault+0x1e2/0x460
[<ffffffff81204886>] ? __fget_light+0x66/0x90
[<ffffffff8163f8e2>] __sys_sendmsg+0x42/0x80
[<ffffffff8163f932>] SyS_sendmsg+0x12/0x20
[<ffffffff8178cb17>] entry_SYSCALL_64_fastpath+0x12/0x6f
Code: 00 00 44 89 e0 e9 7c fb ff ff 4c 89 ff e8 e7 e7 ff ff 41 8b 9d 80 00 00 00 2b 5d d4 89 d8 c1 f8 03 0f b7 c0 e9 33 ff ff f
66 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48
RIP [<ffffffff816a9a92>] ip_do_fragment+0x892/0x8a0
RSP <ffff88006d603170>
Fixes: 7f8a436eaa2c ("openvswitch: Add conntrack action")
Signed-off-by: Joe Stringer <joe@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The only user was removed in commit
029f7f3b8701cc7a ("netfilter: ipv6: nf_defrag: avoid/free clone operations").
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch fixes following problems :
1) percpu_counter_init() can return an error, therefore
init_frag_mem_limit() must propagate this error so that
inet_frags_init_net() can do the same up to its callers.
2) If ip[46]_frags_ns_ctl_register() fail, we must unwind
properly and free the percpu_counter.
Without this fix, we leave freed object in percpu_counters
global list (if CONFIG_HOTPLUG_CPU) leading to crashes.
This bug was detected by KASAN and syzkaller tool
(http://github.com/google/syzkaller)
Fixes: 6d7b857d541e ("net: use lib/percpu_counter API for fragmentation mem accounting")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The function ip_defrag is called on both the input and the output
paths of the networking stack. In particular conntrack when it is
tracking outbound packets from the local machine calls ip_defrag.
So add a struct net parameter and stop making ip_defrag guess which
network namespace it needs to defragment packets in.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Replace calls to vrf_master_ifindex_rcu and vrf_master_ifindex with either
l3mdev_master_ifindex_rcu or l3mdev_master_ifindex.
The pattern:
oif = vrf_master_ifindex(dev) ? : dev->ifindex;
is replaced with
oif = l3mdev_fib_oif(dev);
And remove the now unused vrf macros.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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inetpeer caches based on address only, so duplicate IP addresses within
a namespace return the same cached entry. Enhance the ipv4 address key
to contain both the IPv4 address and VRF device index.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Fragmentation cache uses information from the IP header to reassemble
packets. That information can be duplicated across VRFs -- same source
and destination addresses, protocol and id. Handle fragmentation with
VRFs by adding the VRF device index to entries in the cache and the
lookup arg.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Conflicts:
arch/s390/net/bpf_jit_comp.c
drivers/net/ethernet/ti/netcp_ethss.c
net/bridge/br_multicast.c
net/ipv4/ip_fragment.c
All four conflicts were cases of simple overlapping
changes.
Signed-off-by: David S. Miller <davem@davemloft.net>
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We can simply remove the INET_FRAG_EVICTED flag to avoid all the flags
race conditions with the evictor and use a participation test for the
evictor list, when we're at that point (after inet_frag_kill) in the
timer there're 2 possible cases:
1. The evictor added the entry to its evictor list while the timer was
waiting for the chainlock
or
2. The timer unchained the entry and the evictor won't see it
In both cases we should be able to see list_evictor correctly due
to the sync on the chainlock.
Joint work with Florian Westphal.
Tested-by: Frank Schreuder <fschreuder@transip.nl>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Followup patch will call it after inet_frag_queue was freed, so q->net
doesn't work anymore (but netf = q->net; free(q); mem_limit(netf) would).
Tested-by: Frank Schreuder <fschreuder@transip.nl>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Conflicts:
net/bridge/br_mdb.c
br_mdb.c conflict was a function call being removed to fix a bug in
'net' but whose signature was changed in 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
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When ip_frag_queue() computes positions, it assumes that the passed
sk_buff does not contain L2 headers.
However, when PACKET_FANOUT_FLAG_DEFRAG is used, IP reassembly
functions can be called on outgoing packets that contain L2 headers.
Also, IPv4 checksum is not corrected after reassembly.
Fixes: 7736d33f4262 ("packet: Add pre-defragmentation support for ipv4 fanouts.")
Signed-off-by: Edward Hyunkoo Jee <edjee@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Jerry Chu <hkchu@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This reverts commit 3cc4949269e01f39443d0fcfffb5bc6b47878d45.
There is nothing wrong with coalescing during defragmentation, it
reduces truesize overhead and simplifies things for the receiving
socket (no fraglist walk needed).
However, it also destroys geometry of the original fragments.
While that doesn't cause any breakage (we make sure to not exceed largest
original size) ip_do_fragment contains a 'fastpath' that takes advantage
of a present frag list and results in fragments that (in most cases)
match what was received.
In case its needed the coalescing could be done later, when we're sure
the skb is not forwarded. But discussion during NFWS resulted in
'lets just remove this for now'.
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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