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Marc Dionne 29be9100ac
afs: Don't cross .backup mountpoint from backup volume
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>
2024-05-25 14:02:40 +02:00
arch asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
block Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
certs
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation soc: devicetree updates for v6.10, part 2 2024-05-20 15:11:53 -07:00
drivers asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
fs afs: Don't cross .backup mountpoint from backup volume 2024-05-25 14:02:40 +02:00
include filemap: add helper mapping_max_folio_size() 2024-05-24 13:34:06 +02:00
init Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
io_uring The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel swap: yield device immediately 2024-05-24 13:34:08 +02:00
lib Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
LICENSES
mm Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
net dma-mapping updates for Linux 6.10 2024-05-20 10:23:39 -07:00
rust The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
samples Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
scripts Coccinelle commits for 6.10 2024-05-20 16:00:04 -07:00
security The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
sound The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
tools asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
usr
virt The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
.clang-format
.cocciconfig
.editorconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap Another not-too-busy cycle for documentation, including: 2024-05-13 10:51:53 -07:00
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS VFIO updates for v6.10-rc1 2024-05-20 14:56:50 -07:00
Makefile Kbuild updates for v6.10 2024-05-18 12:39:20 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.