Xuan Zhuo 5c37711d9f virtio-net: fix for unable to handle page fault for address ... In merge mode, when xdp is enabled, if the headroom of buf is smaller than virtnet_get_headroom(), xdp_linearize_page() will be called but the variable of "headroom" is still 0, which leads to wrong logic after entering page_to_skb(). [ 16.600944] BUG: unable to handle page fault for address: ffffecbfff7b43c8[ 16.602175] #PF: supervisor read access in kernel mode [ 16.603350] #PF: error_code(0x0000) - not-present page [ 16.604200] PGD 0 P4D 0 [ 16.604686] Oops: 0000 [#1] SMP PTI [ 16.605306] CPU: 4 PID: 715 Comm: sh Tainted: G B 5.12.0+ #312 [ 16.606429] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/04 [ 16.608217] RIP: 0010:unmap_page_range+0x947/0xde0 [ 16.609014] Code: 00 00 08 00 48 83 f8 01 45 19 e4 41 f7 d4 41 83 e4 03 e9 a4 fd ff ff e8 b7 63 ed ff 4c 89 e0 48 c1 e0 065 [ 16.611863] RSP: 0018:ffffc90002503c58 EFLAGS: 00010286 [ 16.612720] RAX: ffffecbfff7b43c0 RBX: 00007f19f7203000 RCX: ffffffff812ff359 [ 16.613853] RDX: ffff888107778000 RSI: 0000000000000000 RDI: 0000000000000005 [ 16.614976] RBP: ffffea000425e000 R08: 0000000000000000 R09: 3030303030303030 [ 16.616124] R10: ffffffff82ed7d94 R11: 6637303030302052 R12: 7c00000afffded0f [ 16.617276] R13: 0000000000000001 R14: ffff888119ee7010 R15: 00007f19f7202000 [ 16.618423] FS: 0000000000000000(0000) GS:ffff88842fd00000(0000) knlGS:0000000000000000 [ 16.619738] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 16.620670] CR2: ffffecbfff7b43c8 CR3: 0000000103220005 CR4: 0000000000370ee0 [ 16.621792] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 16.622920] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 16.624047] Call Trace: [ 16.624525] ? release_pages+0x24d/0x730 [ 16.625209] unmap_single_vma+0xa9/0x130 [ 16.625885] unmap_vmas+0x76/0xf0 [ 16.626480] exit_mmap+0xa0/0x210 [ 16.627129] mmput+0x67/0x180 [ 16.627673] do_exit+0x3d1/0xf10 [ 16.628259] ? do_user_addr_fault+0x231/0x840 [ 16.629000] do_group_exit+0x53/0xd0 [ 16.629631] __x64_sys_exit_group+0x1d/0x20 [ 16.630354] do_syscall_64+0x3c/0x80 [ 16.630988] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 16.631828] RIP: 0033:0x7f1a043d0191 [ 16.632464] Code: Unable to access opcode bytes at RIP 0x7f1a043d0167. [ 16.633502] RSP: 002b:00007ffe3d993308 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 16.634737] RAX: ffffffffffffffda RBX: 00007f1a044c9490 RCX: 00007f1a043d0191 [ 16.635857] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 16.636986] RBP: 0000000000000000 R08: ffffffffffffff88 R09: 0000000000000001 [ 16.638120] R10: 0000000000000008 R11: 0000000000000246 R12: 00007f1a044c9490 [ 16.639245] R13: 0000000000000001 R14: 00007f1a044c9968 R15: 0000000000000000 [ 16.640408] Modules linked in: [ 16.640958] CR2: ffffecbfff7b43c8 [ 16.641557] ---[ end trace bc4891c6ce46354c ]--- [ 16.642335] RIP: 0010:unmap_page_range+0x947/0xde0 [ 16.643135] Code: 00 00 08 00 48 83 f8 01 45 19 e4 41 f7 d4 41 83 e4 03 e9 a4 fd ff ff e8 b7 63 ed ff 4c 89 e0 48 c1 e0 065 [ 16.645983] RSP: 0018:ffffc90002503c58 EFLAGS: 00010286 [ 16.646845] RAX: ffffecbfff7b43c0 RBX: 00007f19f7203000 RCX: ffffffff812ff359 [ 16.647970] RDX: ffff888107778000 RSI: 0000000000000000 RDI: 0000000000000005 [ 16.649091] RBP: ffffea000425e000 R08: 0000000000000000 R09: 3030303030303030 [ 16.650250] R10: ffffffff82ed7d94 R11: 6637303030302052 R12: 7c00000afffded0f [ 16.651394] R13: 0000000000000001 R14: ffff888119ee7010 R15: 00007f19f7202000 [ 16.652529] FS: 0000000000000000(0000) GS:ffff88842fd00000(0000) knlGS:0000000000000000 [ 16.653887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 16.654841] CR2: ffffecbfff7b43c8 CR3: 0000000103220005 CR4: 0000000000370ee0 [ 16.655992] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 16.657150] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 16.658290] Kernel panic - not syncing: Fatal exception [ 16.659613] Kernel Offset: disabled [ 16.660234] ---[ end Kernel panic - not syncing: Fatal exception ]--- Fixes: fb32856b16 ("virtio-net: page_to_skb() use build_skb when there's sufficient tailroom") Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2021-06-01 15:24:11 -07:00
..
appletalk	net: appletalk: cops: Fix data race in cops_probe1	2021-05-24 14:00:32 -07:00
arcnet
bonding	bonding: init notify_work earlier to avoid uninitialized use	2021-05-17 15:24:20 -07:00
caif	net: caif: remove BUG_ON(dev == NULL) in caif_xmit	2021-05-13 17:30:41 +02:00
can	can: m_can: m_can_tx_work_queue(): fix tx_skb race condition	2021-05-06 09:24:07 +02:00
dsa	net: dsa: microchip: enable phy errata workaround on 9567	2021-05-24 14:27:18 -07:00
ethernet	net: stmmac: fix kernel panic due to NULL pointer dereference of mdio_bus_data	2021-05-30 13:41:55 -07:00
fddi	fddi/skfp: fix typo	2021-04-27 14:07:27 -07:00
fjes
hamradio
hippi
hyperv	hv_netvsc: Make netvsc/VF binding check both MAC and serial number	2021-04-25 18:19:23 -07:00
ieee802154
ipa	net: ipa: memory region array is variable size	2021-05-11 16:22:37 -07:00
ipvlan
mdio	net: mdio: octeon: Fix some double free issues	2021-05-13 15:43:52 -07:00
mhi
netdevsim	netdevsim: Only use sampling truncation length when valid	2021-04-22 13:23:56 -07:00
pcs
phy	net: mdiobus: get rid of a BUG_ON()	2021-05-17 15:50:58 -07:00
plip
ppp	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
slip
team
usb	net: usb: fix memory leak in smsc75xx_bind	2021-05-24 14:26:25 -07:00
vmxnet3
wan	Revert "drivers/net/wan/hdlc_fr: Fix a double free in pvc_xmit"	2021-05-03 13:37:58 -07:00
wireguard
wireless	Networking fixes for 5.13-rc4, including fixes from bpf, netfilter,	2021-05-26 17:44:49 -10:00
wwan	net: wwan: core: Return poll error in case of port removal	2021-04-22 13:26:02 -07:00
xen-netback
bareudp.c
dummy.c
eql.c
geneve.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-04-26 12:00:00 -07:00
gtp.c
ifb.c
Kconfig	net: Add a WWAN subsystem	2021-04-16 15:31:02 -07:00
LICENSE.SRC
loopback.c
macsec.c
macvlan.c	macvlan: Use 'hash' iterators to simplify code	2021-04-27 14:03:11 -07:00
macvtap.c
Makefile	net: Add a WWAN subsystem	2021-04-16 15:31:02 -07:00
mdio.c
mii.c
net_failover.c
netconsole.c
nlmon.c
ntb_netdev.c
rionet.c
sb1000.c
Space.c
sungem_phy.c
tap.c
thunderbolt.c
tun.c	net: tun: Remove redundant assignment to ret	2021-04-28 13:58:58 -07:00
veth.c	veth: check for NAPI instead of xdp_prog before xmit of XDP frame	2021-04-16 15:42:07 -07:00
virtio_net.c	virtio-net: fix for unable to handle page fault for address	2021-06-01 15:24:11 -07:00
vrf.c
vsockmon.c
vxlan.c
xen-netfront.c