linux/fs/afs
David Howells 5399d52233 rxrpc: Fix deadlock around release of dst cached on udp tunnel
AF_RXRPC sockets use UDP ports in encap mode.  This causes socket and dst
from an incoming packet to get stolen and attached to the UDP socket from
whence it is leaked when that socket is closed.

When a network namespace is removed, the wait for dst records to be cleaned
up happens before the cleanup of the rxrpc and UDP socket, meaning that the
wait never finishes.

Fix this by moving the rxrpc (and, by dependence, the afs) private
per-network namespace registrations to the device group rather than subsys
group.  This allows cached rxrpc local endpoints to be cleared and their
UDP sockets closed before we try waiting for the dst records.

The symptom is that lines looking like the following:

	unregister_netdevice: waiting for lo to become free

get emitted at regular intervals after running something like the
referenced syzbot test.

Thanks to Vadim for tracking this down and work out the fix.

Reported-by: syzbot+df400f2f24a1677cd7e0@syzkaller.appspotmail.com
Reported-by: Vadim Fedorenko <vfedorenko@novek.ru>
Fixes: 5271953cad ("rxrpc: Use the UDP encap_rcv hook")
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vadim Fedorenko <vfedorenko@novek.ru>
Link: https://lore.kernel.org/r/161196443016.3868642.5577440140646403533.stgit@warthog.procyon.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-29 21:38:11 -08:00
..
addr_list.c afs: Use kfree_rcu() instead of casting kfree() to rcu_callback_t 2020-03-13 10:47:33 -07:00
afs_cm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
afs_fs.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
afs_vl.h afs: Implement client support for the YFSVL.GetCellName RPC op 2020-06-04 15:37:57 +01:00
afs.h afs: Implement client support for the YFSVL.GetCellName RPC op 2020-06-04 15:37:57 +01:00
cache.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
callback.c afs: Fix the by-UUID server tree to allow servers with the same UUID 2020-06-04 15:37:57 +01:00
cell.c afs: Fix tracing deref-before-check 2020-10-27 22:05:56 +00:00
cmservice.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
dir_edit.c afs: Fix directory entry size calculation 2021-01-04 12:25:19 +00:00
dir_silly.c afs: Fix silly rename 2020-06-16 22:00:28 +01:00
dir.c afs: Fix directory entry size calculation 2021-01-04 12:25:19 +00:00
dynroot.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
file.c afs: Fix afs_invalidatepage to adjust the dirty region 2020-10-29 13:53:04 +00:00
flock.c afs: Remove erroneous fallthough annotation 2020-08-27 14:33:01 -05:00
fs_operation.c afs: Fix key ref leak in afs_put_operation() 2020-08-20 10:41:45 -07:00
fs_probe.c rxrpc: Make rxrpc_kernel_get_srtt() indicate validity 2020-08-20 18:21:28 +01:00
fsclient.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
inode.c afs: Fix speculative status fetch going out of order wrt to modifications 2020-11-22 11:27:03 -08:00
internal.h afs: Fix speculative status fetch going out of order wrt to modifications 2020-11-22 11:27:03 -08:00
Kconfig docs: filesystems: fix renamed references 2020-04-20 15:45:22 -06:00
main.c rxrpc: Fix deadlock around release of dst cached on udp tunnel 2021-01-29 21:38:11 -08:00
Makefile afs: Detect cell aliases 1 - Cells with root volumes 2020-06-04 15:37:57 +01:00
misc.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mntpt.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
proc.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
protocol_uae.h afs: Add support for the UAE error table 2019-06-28 18:37:53 +01:00
protocol_yfs.h afs: Implement client support for the YFSVL.GetCellName RPC op 2020-06-04 15:37:57 +01:00
rotate.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rxrpc.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
security.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
server_list.c afs: Reorganise volume and server trees to be rooted on the cell 2020-06-04 15:37:57 +01:00
server.c afs: Don't assert on unpurgeable server records 2020-10-16 14:39:34 +01:00
super.c afs: Fix memory leak when mounting with multiple source parameters 2020-12-08 15:59:25 -08:00
vl_alias.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
vl_list.c afs: Don't use VL probe running state to make decisions outside probe code 2020-08-20 18:21:28 +01:00
vl_probe.c afs: Don't use VL probe running state to make decisions outside probe code 2020-08-20 18:21:28 +01:00
vl_rotate.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
vlclient.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
volume.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
write.c afs: Fix afs_write_end() when called with copied == 0 [ver #3] 2020-11-14 11:51:18 -08:00
xattr.c afs: Fix incorrect freeing of the ACL passed to the YFS ACL store op 2020-11-03 09:53:40 -08:00
xdr_fs.h afs: Fix directory entry size calculation 2021-01-04 12:25:19 +00:00
yfsclient.c afs: Fix warning due to unadvanced marshalling pointer 2020-11-03 09:53:40 -08:00