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b10252c7ae
linux/fs/nfsd
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Alexander Sverdlin b10252c7ae nfsd: Fix nsfd startup race (again) 
Commit bd5ae9288d ("nfsd: register pernet ops last, unregister first")
has re-opened rpc_pipefs_event() race against nfsd_net_id registration
(register_pernet_subsys()) which has been fixed by commit bb7ffbf29e
("nfsd: fix nsfd startup race triggering BUG_ON").

Restore the order of register_pernet_subsys() vs register_cld_notifier().
Add WARN_ON() to prevent a future regression.

Crash info:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000012
CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1
pc : rpc_pipefs_event+0x54/0x120 [nfsd]
lr : rpc_pipefs_event+0x48/0x120 [nfsd]
Call trace:
 rpc_pipefs_event+0x54/0x120 [nfsd]
 blocking_notifier_call_chain
 rpc_fill_super
 get_tree_keyed
 rpc_fs_get_tree
 vfs_get_tree
 do_mount
 ksys_mount
 __arm64_sys_mount
 el0_svc_handler
 el0_svc

Fixes: bd5ae9288d ("nfsd: register pernet ops last, unregister first")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-12-10 11:54:59 -05:00
..
acl.h nfsd: eliminate an unnecessary acl size limit 2019-08-28 21:13:45 -04:00
auth.c nfsd: auth: Fix gid sorting when rootsquash enabled 2018-01-22 20:13:07 -08:00
auth.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blocklayout.c nfsd/blocklayout: use ->get_unique_id instead of sending SCSI commands 2021-10-22 08:33:57 -06:00
blocklayoutxdr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blocklayoutxdr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.h nfsd4: make drc_slab global, not per-net 2020-06-01 17:44:45 -04:00
current_stateid.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
export.c idmapped-mounts-v5.12 2021-02-23 13:39:45 -08:00
export.h nfsd: report per-export stats 2021-01-25 09:36:28 -05:00
fault_inject.c nfsd: no need to check return value of debugfs_create functions 2019-07-03 16:57:17 +02:00
filecache.c fsnotify: Protect fsnotify_handle_inode_event from no-inode events 2021-10-27 12:34:12 +02:00
filecache.h nfsd: convert file cache to use over/underflow safe refcount 2020-02-06 11:22:55 -05:00
flexfilelayout.c NFSD: simplify struct nfsfh 2021-10-02 15:51:10 -04:00
flexfilelayoutxdr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
flexfilelayoutxdr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idmap.h
Kconfig nfsd/blocklayout: use ->get_unique_id instead of sending SCSI commands 2021-10-22 08:33:57 -06:00
lockd.c NFSD: simplify struct nfsfh 2021-10-02 15:51:10 -04:00
Makefile nfsd: remove fault injection code 2020-09-25 18:01:26 -04:00
netns.h NFSD: delay unmount source's export after inter-server copy completed. 2021-05-25 17:06:51 -04:00
nfs2acl.c SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
nfs3acl.c SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
nfs3proc.c NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment() 2021-10-02 16:10:01 -04:00
nfs3xdr.c SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
nfs4acl.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
nfs4callback.c NFSD: simplify struct nfsfh 2021-10-02 15:51:10 -04:00
nfs4idmap.c nfsd: Use seq_putc() in two functions 2020-07-13 17:28:46 -04:00
nfs4layouts.c nfsd/blocklayout: use ->get_unique_id instead of sending SCSI commands 2021-10-22 08:33:57 -06:00
nfs4proc.c NFSD: Save location of NFSv4 COMPOUND status 2021-10-13 11:34:49 -04:00
nfs4recover.c nfsd: Fix nsfd startup race (again) 2021-12-10 11:54:59 -05:00
nfs4state.c A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping 2021-11-10 16:45:54 -08:00
nfs4xdr.c This is just one bugfix for a bufferflow in knfsd's xdr decoding. 2021-11-17 08:38:00 -08:00
nfscache.c NFSD: Optimize DRC bucket pruning 2021-09-21 18:21:34 -04:00
nfsctl.c nfsd: Fix nsfd startup race (again) 2021-12-10 11:54:59 -05:00
nfsd.h SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
nfsfh.c NFSD: simplify struct nfsfh 2021-10-02 15:51:10 -04:00
nfsfh.h NFSD: simplify struct nfsfh 2021-10-02 15:51:10 -04:00
nfsproc.c NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment() 2021-10-02 16:10:01 -04:00
nfssvc.c NFSD:fix boolreturn.cocci warning 2021-10-19 10:36:48 -04:00
nfsxdr.c SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
pnfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
state.h nfsd: track filehandle aliasing in nfs4_files 2021-04-19 16:41:36 -04:00
stats.c nfsd: protect concurrent access to nfsd stats counters 2021-01-25 09:36:27 -05:00
stats.h nfsd: report per-export stats 2021-01-25 09:36:28 -05:00
trace.c NFSD: Add SPDX header for fs/nfsd/trace.c 2020-11-30 13:00:24 -05:00
trace.h NFS: Move NFS protocol display macros to global header 2021-11-02 12:31:23 -04:00
vfs.c nfsd4: remove obselete comment 2021-11-01 17:17:14 -04:00
vfs.h NFSD: Update the NFSv3 ACCESS3res encoder to use struct xdr_stream 2021-03-22 10:18:52 -04:00
xdr3.h SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
xdr4.h SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00
xdr4cb.h NFSD CB_OFFLOAD xdr 2018-09-25 20:34:54 -04:00
xdr.h SUNRPC: Change return value type of .pc_encode 2021-10-13 11:34:49 -04:00