Marc Dionne e31fe702ed afs: Don't cross .backup mountpoint from backup volume ...

commit 29be9100aca2915fab54b5693309bc42956542e5 upstream.

Don't cross a mountpoint that explicitly specifies a backup volume
(target is <vol>.backup) when starting from a backup volume.

It it not uncommon to mount a volume's backup directly in the volume
itself.  This can cause tools that are not paying attention to get
into a loop mounting the volume onto itself as they attempt to
traverse the tree, leading to a variety of problems.

This doesn't prevent the general case of loops in a sequence of
mountpoints, but addresses a common special case in the same way
as other afs clients.

Reported-by: Jan Henrik Sylvester <jan.henrik.sylvester@uni-hamburg.de>
Link: http://lists.infradead.org/pipermail/linux-afs/2024-May/008454.html
Reported-by: Markus Suvanto <markus.suvanto@gmail.com>
Link: http://lists.infradead.org/pipermail/linux-afs/2024-February/008074.html
Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/768760.1716567475@warthog.procyon.org.uk
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2024-06-16 13:32:30 +02:00

..

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 usage of read_seqbegin_or_lock() in afs_lookup_volume_rcu()

2024-02-23 08:42:04 +01:00

cell.c

afs: Fix overwriting of result of DNS query

2024-01-05 15:12:25 +01:00

cmservice.c

afs: Fix tracepoint string placement with built-in AFS

2021-07-28 14:35:41 +02:00

dir_edit.c

afs: Fix updating of i_blocks on file/dir extension

2021-09-30 10:11:01 +02:00

dir_silly.c

afs: Fix speculative status fetches

2021-05-14 09:50:45 +02:00

dir.c

afs: Revert "afs: Hide silly-rename files from userspace"

2024-03-26 18:22:01 -04:00

dynroot.c

afs: Fix dynamic root lookup DNS check

2024-01-05 15:12:24 +01:00

file.c

afs: Stop listxattr() from listing "afs.*" attributes

2021-03-25 09:04:07 +01:00

flock.c

afs: Use the operation issue time instead of the reply time for callbacks

2022-09-15 11:32:05 +02:00

fs_operation.c

afs: Fix speculative status fetches

2021-05-14 09:50:45 +02:00

fs_probe.c

afs: Fix lost servers_outstanding count

2023-01-14 10:16:22 +01:00

fsclient.c

afs: Use the operation issue time instead of the reply time for callbacks

2022-09-15 11:32:05 +02:00

inode.c

afs: Fix updating of i_size with dv jump from server

2023-05-17 11:48:06 +02:00

internal.h

afs: Fix afs_server_list to be cleaned up with RCU

2023-12-08 08:46:07 +01:00

Kconfig

docs: filesystems: fix renamed references

2020-04-20 15:45:22 -06:00

main.c

afs: Fix an IS_ERR() vs NULL check

2021-06-23 14:42:40 +02:00

Makefile

afs: Detect cell aliases 1 - Cells with root volumes

2020-06-04 15:37:57 +01:00

misc.c

afs: Return -EAGAIN, not -EREMOTEIO, when a file already locked

2022-09-23 14:17:00 +02:00

mntpt.c

afs: Don't cross .backup mountpoint from backup volume

2024-06-16 13:32:30 +02:00

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

afs: Fix refcount underflow from error handling race

2023-12-20 15:44:27 +01:00

security.c

treewide: Remove uninitialized_var() usage

2020-07-16 12:35:15 -07:00

server_list.c

afs: Fix afs_server_list to be cleaned up with RCU

2023-12-08 08:46:07 +01:00

server.c

afs: fix the usage of read_seqbegin_or_lock() in afs_find_server*()

2024-02-23 08:42:04 +01:00

super.c

afs: Fix file locking on R/O volumes to operate in local mode

2023-12-08 08:46:09 +01:00

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: Fix vlserver probe RTT handling

2023-06-21 15:45:40 +02:00

vl_rotate.c

afs: Return ENOENT if no cell DNS record can be found

2023-12-08 08:46:09 +01:00

vlclient.c

treewide: Use fallthrough pseudo-keyword

2020-08-23 17:36:59 -05:00

volume.c

afs: Increase buffer size in afs_update_volume_status()

2024-03-01 13:16:50 +01:00

write.c

afs: Fix updating of i_blocks on file/dir extension

2021-09-30 10:11:01 +02:00

xattr.c

afs: Stop listxattr() from listing "afs.*" attributes

2021-03-25 09:04:07 +01:00

xdr_fs.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36

2019-05-24 17:27:11 +02:00

yfsclient.c

afs: Use the operation issue time instead of the reply time for callbacks

2022-09-15 11:32:05 +02:00