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Eyal Birger 5918c3f480 xfrm: interface: fix use-after-free after changing collect_md xfrm interface 
[ Upstream commit a90b2a1aaa ]

collect_md property on xfrm interfaces can only be set on device creation,
thus xfrmi_changelink() should fail when called on such interfaces.

The check to enforce this was done only in the case where the xi was
returned from xfrmi_locate() which doesn't look for the collect_md
interface, and thus the validation was never reached.

Calling changelink would thus errornously place the special interface xi
in the xfrmi_net->xfrmi hash, but since it also exists in the
xfrmi_net->collect_md_xfrmi pointer it would lead to a double free when
the net namespace was taken down [1].

Change the check to use the xi from netdev_priv which is available earlier
in the function to prevent changes in xfrm collect_md interfaces.

[1] resulting oops:
[    8.516540] kernel BUG at net/core/dev.c:12029!
[    8.516552] Oops: invalid opcode: 0000 [#1] SMP NOPTI
[    8.516559] CPU: 0 UID: 0 PID: 12 Comm: kworker/u80:0 Not tainted 6.15.0-virtme #5 PREEMPT(voluntary)
[    8.516565] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    8.516569] Workqueue: netns cleanup_net
[    8.516579] RIP: 0010:unregister_netdevice_many_notify+0x101/0xab0
[    8.516590] Code: 90 0f 0b 90 48 8b b0 78 01 00 00 48 8b 90 80 01 00 00 48 89 56 08 48 89 32 4c 89 80 78 01 00 00 48 89 b8 80 01 00 00 eb ac 90 <0f> 0b 48 8b 45 00 4c 8d a0 88 fe ff ff 48 39 c5 74 5c 41 80 bc 24
[    8.516593] RSP: 0018:ffffa93b8006bd30 EFLAGS: 00010206
[    8.516598] RAX: ffff98fe4226e000 RBX: ffffa93b8006bd58 RCX: ffffa93b8006bc60
[    8.516601] RDX: 0000000000000004 RSI: 0000000000000000 RDI: dead000000000122
[    8.516603] RBP: ffffa93b8006bdd8 R08: dead000000000100 R09: ffff98fe4133c100
[    8.516605] R10: 0000000000000000 R11: 00000000000003d2 R12: ffffa93b8006be00
[    8.516608] R13: ffffffff96c1a510 R14: ffffffff96c1a510 R15: ffffa93b8006be00
[    8.516615] FS:  0000000000000000(0000) GS:ffff98fee73b7000(0000) knlGS:0000000000000000
[    8.516619] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.516622] CR2: 00007fcd2abd0700 CR3: 000000003aa40000 CR4: 0000000000752ef0
[    8.516625] PKRU: 55555554
[    8.516627] Call Trace:
[    8.516632]  <TASK>
[    8.516635]  ? rtnl_is_locked+0x15/0x20
[    8.516641]  ? unregister_netdevice_queue+0x29/0xf0
[    8.516650]  ops_undo_list+0x1f2/0x220
[    8.516659]  cleanup_net+0x1ad/0x2e0
[    8.516664]  process_one_work+0x160/0x380
[    8.516673]  worker_thread+0x2aa/0x3c0
[    8.516679]  ? __pfx_worker_thread+0x10/0x10
[    8.516686]  kthread+0xfb/0x200
[    8.516690]  ? __pfx_kthread+0x10/0x10
[    8.516693]  ? __pfx_kthread+0x10/0x10
[    8.516697]  ret_from_fork+0x82/0xf0
[    8.516705]  ? __pfx_kthread+0x10/0x10
[    8.516709]  ret_from_fork_asm+0x1a/0x30
[    8.516718]  </TASK>

Fixes: abc340b38b ("xfrm: interface: support collect metadata mode")
Reported-by: Lonial Con <kongln9170@gmail.com>
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-01 09:48:41 +01:00
arch x86/hyperv: Fix usage of cpu_online_mask to get valid cpu 2025-08-01 09:48:40 +01:00
block block: fix kobject leak in blk_unregister_queue 2025-07-24 08:56:30 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() 2025-07-17 18:37:24 +02:00
Documentation bpf: Adjust free target to avoid global starvation of LRU map 2025-07-17 18:37:22 +02:00
drivers staging: vchiq_arm: Make vchiq_shutdown never fail 2025-08-01 09:48:40 +01:00
fs smb: client: let smbd_post_send_iter() respect the peers max_send_size and transmit all data 2025-07-24 08:56:38 +02:00
include rxrpc: Fix recv-recv race of completed call 2025-07-24 08:56:35 +02:00
init rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
io_uring io_uring/poll: fix POLLERR handling 2025-07-24 08:56:23 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel sched,freezer: Remove unnecessary warning in __thaw_task 2025-07-24 08:56:37 +02:00
lib lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users() 2025-07-17 18:37:14 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm kasan: remove kasan_find_vm_area() to prevent possible deadlock 2025-07-17 18:37:23 +02:00
net xfrm: interface: fix use-after-free after changing collect_md xfrm interface 2025-08-01 09:48:41 +01:00
rust rust: use #[used(compiler)] to fix build and modpost with Rust >= 1.89.0 2025-07-24 08:56:37 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-05-29 11:02:01 +02:00
scripts rust: use #[used(compiler)] to fix build and modpost with Rust >= 1.89.0 2025-07-24 08:56:37 +02:00
security selinux: change security_compute_sid to return the ssid or tsid on match 2025-07-10 16:05:04 +02:00
sound ALSA: hda/realtek: Add quirk for ASUS ROG Strix G712LWS 2025-07-24 08:56:23 +02:00
tools tools/hv: fcopy: Fix incorrect file path conversion 2025-08-01 09:48:40 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-18 08:24:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.40 2025-07-24 08:56:38 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -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 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.