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linux/net
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Ilya Dryomov 3c7f1671af libceph: fall back to sendmsg for slab pages 
commit 7e241f647d upstream.

skb_can_coalesce() allows coalescing neighboring slab objects into
a single frag:

  return page == skb_frag_page(frag) &&
         off == frag->page_offset + skb_frag_size(frag);

ceph_tcp_sendpage() can be handed slab pages.  One example of this is
XFS: it passes down sector sized slab objects for its metadata I/O.  If
the kernel client is co-located on the OSD node, the skb may go through
loopback and pop on the receive side with the exact same set of frags.
When tcp_recvmsg() attempts to copy out such a frag, hardened usercopy
complains because the size exceeds the object's allocated size:

  usercopy: kernel memory exposure attempt detected from ffff9ba917f20a00 (kmalloc-512) (1024 bytes)

Although skb_can_coalesce() could be taught to return false if the
resulting frag would cross a slab object boundary, we already have
a fallback for non-refcounted pages.  Utilize it for slab pages too.

Cc: stable@vger.kernel.org # 4.8+
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-11-27 16:10:51 +01:00
..
6lowpan 6lowpan: iphc: reset mac_header after decompress to fix panic 2018-10-03 17:00:47 -07:00
9p 9p: clear dangling pointers in p9stat_free 2018-11-21 09:24:04 +01:00
802 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
8021q net: fix use-after-free in GRO with ESP 2018-07-22 14:28:44 +02:00
appletalk License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
atm atm: Preserve value of skb->truesize when accounting to vcc 2018-07-22 14:28:43 +02:00
ax25 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
batman-adv batman-adv: fix hardif_neigh refcount on queue_work() failure 2018-10-20 09:48:49 +02:00
bluetooth Bluetooth: SMP: fix crash in unpairing 2018-11-04 14:52:39 +01:00
bpf
bridge net: bridge: remove ipv6 zero address check in mcast queries 2018-11-04 14:52:48 +01:00
caif net: caif: Add a missing rcu_read_unlock() in caif_flow_cb 2018-09-05 09:26:27 +02:00
can can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once 2018-01-23 19:58:17 +01:00
ceph libceph: fall back to sendmsg for slab pages 2018-11-27 16:10:51 +01:00
core net-gro: reset skb->pkt_type in napi_reuse_skb() 2018-11-23 08:19:25 +01:00
dcb net: dcb: For wild-card lookups, use priority -1, not 0 2018-09-19 22:43:43 +02:00
dccp inet: make sure to grab rcu_read_lock before using ireq->ireq_opt 2018-10-18 09:16:21 +02:00
decnet dn_getsockoptdecnet: move nf_{get/set}sockopt outside sock lock 2018-02-25 11:07:52 +01:00
dns_resolver KEYS: DNS: fix parsing multiple options 2018-07-22 14:28:49 +02:00
dsa net: dsa: Do not suspend/resume closed slave_dev 2018-08-06 16:20:48 +02:00
ethernet networking: make skb_push & __skb_push return void pointers 2017-06-16 11:48:40 -04:00
hsr net/hsr: Check skb_put_padto() return value 2017-08-22 13:40:23 -07:00
ieee802154 inet: frags: fix ip6frag_low_thresh boundary 2018-09-19 22:43:47 +02:00
ife net: sched: ife: check on metadata length 2018-04-29 11:33:13 +02:00
ipv4 inet: frags: better deal with smp races 2018-11-23 08:19:27 +01:00
ipv6 ipv6: Fix PMTU updates for UDP/raw sockets in presence of VRF 2018-11-23 08:19:25 +01:00
ipx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iucv net/iucv: Free memory obtained by kzalloc 2018-03-31 18:10:41 +02:00
kcm kcm: Fix use-after-free caused by clonned sockets 2018-06-11 22:49:19 +02:00
key af_key: Always verify length of provided sadb_key 2018-06-16 09:45:14 +02:00
l2tp l2tp: remove configurable payload offset 2018-11-04 14:52:43 +01:00
l3mdev
lapb net, lapb: convert lapb_cb.refcnt from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
llc llc: set SOCK_RCU_FREE in llc_sap_add_socket() 2018-11-04 14:52:48 +01:00
mac80211 mac80211: fix TX status reporting for ieee80211s 2018-11-04 14:52:37 +01:00
mac802154 net: mac802154: tx: expand tailroom if necessary 2018-09-09 19:55:52 +02:00
mpls mpls, nospec: Sanitize array index in mpls_label_ok() 2018-02-22 15:42:28 +01:00
ncsi net/ncsi: Fix length of GVI response packet 2017-10-21 01:56:38 +01:00
netfilter netfilter: xt_IDLETIMER: add sysfs filename checking routine 2018-11-27 16:10:48 +01:00
netlabel netlabel: check for IPV4MASK in addrinfo_get 2018-10-18 09:16:18 +02:00
netlink netlink: Don't shift on 64 for ngroups 2018-08-09 12:16:38 +02:00
netrom net, netrom: convert nr_node.refcount from atomic_t to refcount_t 2017-07-04 22:35:17 +01:00
nfc NFC: Fix possible memory corruption when handling SHDLC I-Frame commands 2018-09-29 03:06:01 -07:00
nsh nsh: set mac len based on inner packet 2018-07-22 14:28:49 +02:00
openvswitch openvswitch: Fix push/pop ethernet validation 2018-11-04 14:52:50 +01:00
packet net/packet: fix packet drop as of virtio gso 2018-10-18 09:16:19 +02:00
phonet License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
psample MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
qrtr net: qrtr: Broadcast messages only from control port 2018-08-24 13:09:13 +02:00
rds rds: rds_ib_recv_alloc_cache() should call alloc_percpu_gfp() instead 2018-10-13 09:27:29 +02:00
rfkill rfkill: gpio: fix memory leak in probe error path 2018-05-16 10:10:26 +02:00
rose
rxrpc rxrpc: Fix connection-level abort handling 2018-11-04 14:52:46 +01:00
sched net: sched: Remove TCA_OPTIONS from policy 2018-11-13 11:15:18 -08:00
sctp sctp: not increase stream's incnt before sending addstrm_in request 2018-11-23 08:19:26 +01:00
smc net/smc: no shutdown in state SMC_LISTEN 2018-08-24 13:09:22 +02:00
strparser strparser: Remove early eaten to fix full tcp receive buffer stall 2018-07-22 14:28:47 +02:00
sunrpc SUNRPC: drop pointless static qualifier in xdr_get_next_encode_buffer() 2018-11-27 16:10:49 +01:00
switchdev net: switchdev: Remove bridge bypass support from switchdev 2017-08-07 14:48:48 -07:00
tipc tipc: fix flow control accounting for implicit connect 2018-10-18 09:16:19 +02:00
tls tls: possible hang when do_tcp_sendpages hits sndbuf is full case 2018-10-03 17:00:58 -07:00
unix License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
vmw_vsock vsock: split dwork to avoid reinitializations 2018-08-22 07:46:08 +02:00
wimax License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wireless cfg80211: fix use-after-free in reg_process_hint() 2018-11-04 14:52:40 +01:00
x25 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm xfrm: policy: use hlist rcu variants on insert 2018-11-13 11:14:50 -08:00
compat.c net: support compat 64-bit time in {s,g}etsockopt 2018-05-19 10:20:24 +02:00
Kconfig net: Remove CONFIG_NETFILTER_DEBUG and _ASSERT() macros. 2017-09-04 13:25:20 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
socket.c net: socket: fix a missing-check bug 2018-11-04 14:52:49 +01:00
sysctl_net.c