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Pablo Neira Ayuso f9a43007d3 netfilter: nf_tables: double hook unregistration in netns path 
__nft_release_hooks() is called from pre_netns exit path which
unregisters the hooks, then the NETDEV_UNREGISTER event is triggered
which unregisters the hooks again.

[  565.221461] WARNING: CPU: 18 PID: 193 at net/netfilter/core.c:495 __nf_unregister_net_hook+0x247/0x270
[...]
[  565.246890] CPU: 18 PID: 193 Comm: kworker/u64:1 Tainted: G            E     5.18.0-rc7+ #27
[  565.253682] Workqueue: netns cleanup_net
[  565.257059] RIP: 0010:__nf_unregister_net_hook+0x247/0x270
[...]
[  565.297120] Call Trace:
[  565.300900]  <TASK>
[  565.304683]  nf_tables_flowtable_event+0x16a/0x220 [nf_tables]
[  565.308518]  raw_notifier_call_chain+0x63/0x80
[  565.312386]  unregister_netdevice_many+0x54f/0xb50

Unregister and destroy netdev hook from netns pre_exit via kfree_rcu
so the NETDEV_UNREGISTER path see unregistered hooks.

Fixes: 767d1216bf ("netfilter: nftables: fix possible UAF over chains from packet path in netns")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2022-05-31 23:13:10 +02:00
arch Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
block Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
certs certs: Explain the rationale to call panic() 2022-05-23 18:47:49 +03:00
crypto certs: Factor out the blacklist hash creation 2022-05-23 18:47:49 +03:00
Documentation net/ipv6: Expand and rename accept_unsolicited_na to accept_untracked_na 2022-05-31 11:36:57 +02:00
drivers xen/netback: fix incorrect usage of RING_HAS_UNCONSUMED_REQUESTS() 2022-05-31 12:22:22 +02:00
fs Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
include net/ipv6: Expand and rename accept_unsolicited_na to accept_untracked_na 2022-05-31 11:36:57 +02:00
init slab changes for 5.19 2022-05-25 10:24:04 -07:00
ipc fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
kernel bpf: Fix probe read error in ___bpf_prog_run() 2022-05-28 01:09:18 +02:00
lib Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm linux-kselftest-kunit-5.19-rc1 2022-05-25 11:32:53 -07:00
net netfilter: nf_tables: double hook unregistration in netns path 2022-05-31 23:13:10 +02:00
samples Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
scripts Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
security linux-kselftest-kunit-5.19-rc1 2022-05-25 11:32:53 -07:00
sound xen: branch for v5.19-rc1 2022-05-23 20:49:45 -07:00
tools net/ipv6: Expand and rename accept_unsolicited_na to accept_untracked_na 2022-05-31 11:36:57 +02:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-20 13:02:05 -04:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap Scheduler changes in this cycle were: 2022-05-24 11:11:13 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Networking changes for 5.19. 2022-05-25 12:22:58 -07:00
Makefile kernel-hardening updates for v5.19-rc1 2022-05-24 12:27:09 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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 Restructured Text 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.