AuxXxilium/linux_dsm_epyc7002
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b1c17a9a35
linux_dsm_epyc7002/net
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Eric Dumazet b1c17a9a35 flow_dissector: disable preemption around BPF calls 
Various things in eBPF really require us to disable preemption
before running an eBPF program.

syzbot reported :

BUG: assuming atomic context at net/core/flow_dissector.c:737
in_atomic(): 0, irqs_disabled(): 0, pid: 24710, name: syz-executor.3
2 locks held by syz-executor.3/24710:
 #0: 00000000e81a4bf1 (&tfile->napi_mutex){+.+.}, at: tun_get_user+0x168e/0x3ff0 drivers/net/tun.c:1850
 #1: 00000000254afebd (rcu_read_lock){....}, at: __skb_flow_dissect+0x1e1/0x4bb0 net/core/flow_dissector.c:822
CPU: 1 PID: 24710 Comm: syz-executor.3 Not tainted 5.1.0+ #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 __cant_sleep kernel/sched/core.c:6165 [inline]
 __cant_sleep.cold+0xa3/0xbb kernel/sched/core.c:6142
 bpf_flow_dissect+0xfe/0x390 net/core/flow_dissector.c:737
 __skb_flow_dissect+0x362/0x4bb0 net/core/flow_dissector.c:853
 skb_flow_dissect_flow_keys_basic include/linux/skbuff.h:1322 [inline]
 skb_probe_transport_header include/linux/skbuff.h:2500 [inline]
 skb_probe_transport_header include/linux/skbuff.h:2493 [inline]
 tun_get_user+0x2cfe/0x3ff0 drivers/net/tun.c:1940
 tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2037
 call_write_iter include/linux/fs.h:1872 [inline]
 do_iter_readv_writev+0x5fd/0x900 fs/read_write.c:693
 do_iter_write fs/read_write.c:970 [inline]
 do_iter_write+0x184/0x610 fs/read_write.c:951
 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1015
 do_writev+0x15b/0x330 fs/read_write.c:1058
 __do_sys_writev fs/read_write.c:1131 [inline]
 __se_sys_writev fs/read_write.c:1128 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1128
 do_syscall_64+0x103/0x670 arch/x86/entry/common.c:298
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Fixes: d58e468b11 ("flow_dissector: implements flow dissector BPF hook")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Petar Penkov <ppenkov@google.com>
Cc: Stanislav Fomichev <sdf@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-13 09:53:42 -07:00
..
6lowpan 6lowpan: Off by one handling ->nexthdr 2019-04-23 19:09:58 +02:00
9p 9p/net: fix memory leak in p9_client_create 2019-03-13 11:50:04 +01:00
802
8021q vlan: disable SIOCSHWTSTAMP in container 2019-05-09 09:31:16 -07:00
appletalk Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-02 22:14:21 -04:00
atm net: atm: clean up a range check 2019-05-05 10:25:52 -07:00
ax25 net: ax25: fix misuse of %x 2019-04-21 10:37:26 -07:00
batman-adv This feature/cleanup patchset includes the following patches: 2019-05-09 09:44:17 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
bpf bpf: Introduce bpf sk local storage 2019-04-27 09:07:04 -07:00
bpfilter bpfilter: re-add header search paths to tools include to fix build error 2019-02-23 13:34:40 -08:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2019-05-13 08:55:15 -07:00
caif net: caif: avoid using qdisc_qlen() 2019-04-10 12:20:46 -07:00
can netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
ceph Printk changes for 5.2 2019-05-07 09:18:12 -07:00
core flow_dissector: disable preemption around BPF calls 2019-05-13 09:53:42 -07:00
dcb netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
dccp net: dccp : proto: remove Unneeded variable "err" 2019-05-12 13:21:30 -07:00
decnet netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
dns_resolver dns: remove redundant zero length namelen check 2019-04-11 14:01:08 -07:00
dsa net: dsa: Initialize DSA_SKB_CB(skb)->deferred_xmit variable 2019-05-12 13:19:46 -07:00
ethernet net: ethernet: support of_get_mac_address new ERR_PTR error 2019-05-07 12:22:47 -07:00
hsr genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
ieee802154 genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
ife
ipv4 net/tcp: use deferred jump label for TCP acked data hook 2019-05-09 11:13:57 -07:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-07 17:22:09 -07:00
iucv iucv: Remove SKB list assumptions. 2018-11-10 16:55:11 -08:00
kcm kcm: switch order of device registration to fix a crash 2019-04-01 14:59:20 -07:00
key xfrm: clean up xfrm protocol checks 2019-03-26 08:35:36 +01:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-07 17:22:09 -07:00
l3mdev l3mdev: add function to retreive upper master 2018-12-03 14:15:26 -08:00
lapb
llc llc: Check address length before reading address field 2019-04-12 10:25:03 -07:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-02 22:14:21 -04:00
mac802154 mac802154: Remove VLA usage of skcipher 2018-09-28 12:46:07 +08:00
mpls netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
ncsi genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2019-05-13 08:55:15 -07:00
netlabel genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
netlink genetlink: do not validate dump requests if there is no policy 2019-05-04 01:27:10 -04:00
netrom net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
nfc genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
nsh nsh: set mac len based on inner packet 2018-07-12 16:55:29 -07:00
openvswitch openvswitch: Replace removed NF_NAT_NEEDED with IS_ENABLED(CONFIG_NF_NAT) 2019-05-08 09:43:15 -07:00
packet packet: Fix error path in packet_init 2019-05-09 13:45:46 -07:00
phonet netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
psample genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
qrtr net: qrtr: use protocol endiannes variable 2019-05-11 09:59:48 -07:00
rds net: rds: fix spelling mistake "syctl" -> "sysctl" 2019-05-05 10:19:43 -07:00
rfkill *: convert stream-like files from nonseekable_open -> stream_open 2019-05-06 17:46:41 +03:00
rose Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-25 23:52:29 -04:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-02 22:14:21 -04:00
sched net/sched: avoid double free on matchall reoffload 2019-05-08 16:34:58 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
smc 5.2 Merge Window pull request 2019-05-09 09:02:46 -07:00
strparser net: strparser: make it explicitly non-modular 2019-04-22 21:50:54 -07:00
sunrpc NFS client updates for Linux 5.2 2019-05-09 14:33:15 -07:00
switchdev switchdev: Remove unused transaction item queue 2019-03-01 21:35:19 -08:00
tipc tipc: fix hanging clients using poll with EPOLLOUT flag 2019-05-09 09:26:09 -07:00
tls net/tls: handle errors from padding_length() 2019-05-09 16:37:39 -07:00
unix datagram: remove rendundant 'peeked' argument 2019-04-08 09:51:54 -07:00
vmw_vsock vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock 2019-03-08 15:15:44 -08:00
wimax genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
x25 net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
xdp xsk: fix XDP socket ring buffer memory ordering 2019-04-16 20:13:10 -07:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
compat.c net: rework SIOCGSTAMP ioctl handling 2019-04-19 14:07:40 -07:00
Kconfig net: devlink: select NET_DEVLINK from drivers 2019-03-24 14:55:31 -04:00
Makefile net: split out functions related to registering inflight socket files 2019-02-28 08:24:23 -07:00
socket.c net: use indirect calls helpers at the socket layer 2019-05-05 10:38:04 -07:00
sysctl_net.c