CVE: CVE-2024-41047
Published: 2024-07-29
Description: In the Linux kernel, the following vulnerability has been resolved:

i40e: Fix XDP program unloading while removing the driver

The commit 6533e558c650 ("i40e: Fix reset path while removing
the driver") introduced a new PF state "__I40E_IN_REMOVE" to block
modifying the XDP program while the driver is being removed.
Unfortunately, such a change is useful only if the ".ndo_bpf()"
callback was called out of the rmmod context because unloading the
existing XDP program is also a part of driver removing procedure.
In other words, from the rmmod context the driver is expected to
unload the XDP program without reporting any errors. Otherwise,
the kernel warning with callstack is printed out to dmesg.

Example failing scenario:
 1. Load the i40e driver.
 2. Load the XDP program.
 3. Unload the i40e driver (using "rmmod" command).

The example kernel warning log:

[  +0.004646] WARNING: CPU: 94 PID: 10395 at net/core/dev.c:9290 unregister_netdevice_many_notify+0x7a9/0x870
[...]
[  +0.010959] RIP: 0010:unregister_netdevice_many_notify+0x7a9/0x870
[...]
[  +0.002726] Call Trace:
[  +0.002457]  <TASK>
[  +0.002119]  ? __warn+0x80/0x120
[  +0.003245]  ? unregister_netdevice_many_notify+0x7a9/0x870
[  +0.005586]  ? report_bug+0x164/0x190
[  +0.003678]  ? handle_bug+0x3c/0x80
[  +0.003503]  ? exc_invalid_op+0x17/0x70
[  +0.003846]  ? asm_exc_invalid_op+0x1a/0x20
[  +0.004200]  ? unregister_netdevice_many_notify+0x7a9/0x870
[  +0.005579]  ? unregister_netdevice_many_notify+0x3cc/0x870
[  +0.005586]  unregister_netdevice_queue+0xf7/0x140
[  +0.004806]  unregister_netdev+0x1c/0x30
[  +0.003933]  i40e_vsi_release+0x87/0x2f0 [i40e]
[  +0.004604]  i40e_remove+0x1a1/0x420 [i40e]
[  +0.004220]  pci_device_remove+0x3f/0xb0
[  +0.003943]  device_release_driver_internal+0x19f/0x200
[  +0.005243]  driver_detach+0x48/0x90
[  +0.003586]  bus_remove_driver+0x6d/0xf0
[  +0.003939]  pci_unregister_driver+0x2e/0xb0
[  +0.004278]  i40e_exit_module+0x10/0x5f0 [i40e]
[  +0.004570]  __do_sys_delete_module.isra.0+0x197/0x310
[  +0.005153]  do_syscall_64+0x85/0x170
[  +0.003684]  ? syscall_exit_to_user_mode+0x69/0x220
[  +0.004886]  ? do_syscall_64+0x95/0x170
[  +0.003851]  ? exc_page_fault+0x7e/0x180
[  +0.003932]  entry_SYSCALL_64_after_hwframe+0x71/0x79
[  +0.005064] RIP: 0033:0x7f59dc9347cb
[  +0.003648] Code: 73 01 c3 48 8b 0d 65 16 0c 00 f7 d8 64 89 01 48 83
c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 35 16 0c 00 f7 d8 64 89 01 48
[  +0.018753] RSP: 002b:00007ffffac99048 EFLAGS: 00000206 ORIG_RAX:[PII_REDACTED]0000b0
[  +0.007577] RAX: ffffffffffffffda RBX: 0000559b9bb2f6e0 RCX: 00007f59dc9347cb
[  +0.007140] RDX: [PII_REDACTED] RSI: [PII_REDACTED] RDI: 0000559b9bb2f748
[  +0.007146] RBP: 00007ffffac99070 R08: [PII_REDACTED] R09: [PII_REDACTED]
[  +0.007133] R10: 00007f59dc9a5ac0 R11: [PII_REDACTED] R12: [PII_REDACTED]
[  +0.007141] R13: 00007ffffac992d8 R14: 0000559b9bb2f6e0 R15: [PII_REDACTED]
[  +0.007151]  </TASK>
[  +0.002204] ---[ end trace [PII_REDACTED] ]---

Fix this by checking if the XDP program is being loaded or unloaded.
Then, block only loading a new program while "__I40E_IN_REMOVE" is set.
Also, move testing "__I40E_IN_REMOVE" flag to the beginning of XDP_SETUP
callback to avoid unnecessary operations and checks.
CVSS Score: 5.5 (MEDIUM)
References: https://git.kernel.org/stable/c/0075b8c94d76830c7b6f018f6e4eeb0bf6465fdc; https://git.kernel.org/stable/c/01fc5142ae6b06b61ed51a624f2732d6525d8ea3; https://git.kernel.org/stable/c/4bc336b2345f1485438c0eb7246d9c8a8d09f8ff