Bjørn Mork 49c2c3f246 cdc_ncm: avoid padding beyond end of skb ... Commit 4a0e3e989d ("cdc_ncm: Add support for moving NDP to end of NCM frame") added logic to reserve space for the NDP at the end of the NTB/skb. This reservation did not take the final alignment of the NDP into account, causing us to reserve too little space. Additionally the padding prior to NDP addition did not ensure there was enough space for the NDP. The NTB/skb with the NDP appended would then exceed the configured max size. This caused the final padding of the NTB to use a negative count, padding to almost INT_MAX, and resulting in: [60103.825970] BUG: unable to handle kernel paging request at ffff9641f2004000 [60103.825998] IP: __memset+0x24/0x30 [60103.826001] PGD a6a06067 P4D a6a06067 PUD 4f65a063 PMD 72003063 PTE 0 [60103.826013] Oops: 0002 [#1] SMP NOPTI [60103.826018] Modules linked in: (removed( [60103.826158] CPU: 0 PID: 5990 Comm: Chrome_DevTools Tainted: G O 4.14.0-3-amd64 #1 Debian 4.14.17-1 [60103.826162] Hardware name: LENOVO 20081 BIOS 41CN28WW(V2.04) 05/03/2012 [60103.826166] task: ffff964193484fc0 task.stack: ffffb2890137c000 [60103.826171] RIP: 0010:__memset+0x24/0x30 [60103.826174] RSP: 0000:ffff964316c03b68 EFLAGS: 00010216 [60103.826178] RAX: 0000000000000000 RBX: 00000000fffffffd RCX: 000000001ffa5000 [60103.826181] RDX: 0000000000000005 RSI: 0000000000000000 RDI: ffff9641f2003ffc [60103.826184] RBP: ffff964192f6c800 R08: 00000000304d434e R09: ffff9641f1d2c004 [60103.826187] R10: 0000000000000002 R11: 00000000000005ae R12: ffff9642e6957a80 [60103.826190] R13: ffff964282ff2ee8 R14: 000000000000000d R15: ffff9642e4843900 [60103.826194] FS: 00007f395aaf6700(0000) GS:ffff964316c00000(0000) knlGS:0000000000000000 [60103.826197] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [60103.826200] CR2: ffff9641f2004000 CR3: 0000000013b0c000 CR4: 00000000000006f0 [60103.826204] Call Trace: [60103.826212] <IRQ> [60103.826225] cdc_ncm_fill_tx_frame+0x5e3/0x740 [cdc_ncm] [60103.826236] cdc_ncm_tx_fixup+0x57/0x70 [cdc_ncm] [60103.826246] usbnet_start_xmit+0x5d/0x710 [usbnet] [60103.826254] ? netif_skb_features+0x119/0x250 [60103.826259] dev_hard_start_xmit+0xa1/0x200 [60103.826267] sch_direct_xmit+0xf2/0x1b0 [60103.826273] __dev_queue_xmit+0x5e3/0x7c0 [60103.826280] ? ip_finish_output2+0x263/0x3c0 [60103.826284] ip_finish_output2+0x263/0x3c0 [60103.826289] ? ip_output+0x6c/0xe0 [60103.826293] ip_output+0x6c/0xe0 [60103.826298] ? ip_forward_options+0x1a0/0x1a0 [60103.826303] tcp_transmit_skb+0x516/0x9b0 [60103.826309] tcp_write_xmit+0x1aa/0xee0 [60103.826313] ? sch_direct_xmit+0x71/0x1b0 [60103.826318] tcp_tasklet_func+0x177/0x180 [60103.826325] tasklet_action+0x5f/0x110 [60103.826332] __do_softirq+0xde/0x2b3 [60103.826337] irq_exit+0xae/0xb0 [60103.826342] do_IRQ+0x81/0xd0 [60103.826347] common_interrupt+0x98/0x98 [60103.826351] </IRQ> [60103.826355] RIP: 0033:0x7f397bdf2282 [60103.826358] RSP: 002b:00007f395aaf57d8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff6e [60103.826362] RAX: 0000000000000000 RBX: 00002f07bc6d0900 RCX: 00007f39752d7fe7 [60103.826365] RDX: 0000000000000022 RSI: 0000000000000147 RDI: 00002f07baea02c0 [60103.826368] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [60103.826371] R10: 00000000ffffffff R11: 0000000000000000 R12: 00002f07baea02c0 [60103.826373] R13: 00002f07bba227a0 R14: 00002f07bc6d090c R15: 0000000000000000 [60103.826377] Code: 90 90 90 90 90 90 90 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 <f3> 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 [60103.826442] RIP: __memset+0x24/0x30 RSP: ffff964316c03b68 [60103.826444] CR2: ffff9641f2004000 Commit e1069bbfcf ("net: cdc_ncm: Reduce memory use when kernel memory low") made this bug much more likely to trigger by reducing the NTB size under memory pressure. Link: https://bugs.debian.org/893393 Reported-by: Горбешко Богдан <bodqhrohro@gmail.com> Reported-and-tested-by: Dennis Wassenberg <dennis.wassenberg@secunet.com> Cc: Enrico Mioso <mrkiko.rs@gmail.com> Fixes: 4a0e3e989d ("cdc_ncm: Add support for moving NDP to end of NCM frame") Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>		2018-06-08 19:50:01 -04:00
..
appletalk
arcnet
bonding	bonding: re-evaluate force_primary when the primary slave name changes	2018-06-07 16:47:10 -04:00
caif
can	- Introduce arithmetic overflow test helper functions (Rasmus)	2018-06-06 17:27:14 -07:00
dsa	net: dsa: b53: Fix for brcm tag issue in Cygnus SoC	2018-06-06 13:47:16 -04:00
ethernet	net: aquantia: fix unsigned numvecs comparison with less than zero	2018-06-08 18:45:52 -04:00
fddi	net: fddi: fix a possible null-ptr-deref	2018-06-08 18:47:46 -04:00
fjes
hamradio	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-06-06 18:39:49 -07:00
hippi	hippi: fix spelling mistake: "Framming" -> "Framing"	2018-05-18 13:44:08 -04:00
hyperv	hv_netvsc: Fix a network regression after ifdown/ifup	2018-06-07 16:24:51 -04:00
ieee802154
ipvlan	ipvlan: call netdevice notifier when master mac address changed	2018-05-16 11:59:41 -04:00
netdevsim	netdevsim: Add extack error message for devlink reload	2018-06-05 12:32:37 -04:00
phy	net: phy: broadcom: Enable 125 MHz clock on LED4 pin for BCM54612E by default.	2018-06-05 09:43:09 -04:00
plip
ppp	Merge branch 'work.aio-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2018-06-04 13:57:43 -07:00
slip
team	team: use netdev_features_t instead of u32	2018-06-04 17:30:04 -04:00
usb	cdc_ncm: avoid padding beyond end of skb	2018-06-08 19:50:01 -04:00
vmxnet3	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-05-21 16:01:54 -04:00
wan	wan/fsl_ucc_hdlc: use dma_zalloc_coherent instead of allocator/memset	2018-06-04 17:27:59 -04:00
wimax
wireless	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-06-06 18:39:49 -07:00
xen-netback
dummy.c
eql.c
geneve.c
gtp.c
ifb.c	ifb: fix packets checksum	2018-05-28 23:02:22 -04:00
Kconfig	virtio_net: Extend virtio to use VF datapath when available	2018-05-28 22:59:54 -04:00
LICENSE.SRC
loopback.c
macsec.c
macvlan.c	macvlan: Use software path for offloaded local, broadcast, and multicast traffic	2018-04-25 08:26:19 -07:00
macvtap.c
Makefile	net: Introduce net_failover driver	2018-05-28 22:59:54 -04:00
mdio.c
mii.c
net_failover.c	net_failover: Use netdev_features_t instead of u32	2018-06-04 17:30:04 -04:00
netconsole.c
nlmon.c
ntb_netdev.c
rionet.c
sb1000.c
Space.c
sungem_phy.c
tap.c	net: in virtio_net_hdr only add VLAN_HLEN to csum_start if payload holds vlan	2018-06-07 16:15:38 -04:00
thunderbolt.c
tun.c	net: in virtio_net_hdr only add VLAN_HLEN to csum_start if payload holds vlan	2018-06-07 16:15:38 -04:00
veth.c
virtio_net.c	net: in virtio_net_hdr only add VLAN_HLEN to csum_start if payload holds vlan	2018-06-07 16:15:38 -04:00
vrf.c	vrf: add CRC32c offload to device features	2018-05-28 22:55:13 -04:00
vsockmon.c
vxlan.c
xen-netfront.c