CVE-2022-49543
Description
From CVE.org
In the Linux kernel, the following vulnerability has been resolved: ath11k: fix the warning of dev_wake in mhi_pm_disable_transition() When test device recovery with below command, it has warning in message as below. echo assert > /sys/kernel/debug/ath11k/wcn6855\ hw2.0/simulate_fw_crash echo assert > /sys/kernel/debug/ath11k/qca6390\ hw2.0/simulate_fw_crash warning message: [ 1965.642121] ath11k_pci 0000:06:00.0: simulating firmware assert crash [ 1968.471364] ieee80211 phy0: Hardware restart was requested [ 1968.511305] ------------[ cut here ]------------ [ 1968.511368] WARNING: CPU: 3 PID: 1546 at drivers/bus/mhi/core/pm.c:505 mhi_pm_disable_transition+0xb37/0xda0 [mhi] [ 1968.511443] Modules linked in: ath11k_pci ath11k mac80211 libarc4 cfg80211 qmi_helpers qrtr_mhi mhi qrtr nvme nvme_core [ 1968.511563] CPU: 3 PID: 1546 Comm: kworker/u17:0 Kdump: loaded Tainted: G W 5.17.0-rc3-wt-ath+ #579 [ 1968.511629] Hardware name: Intel(R) Client Systems NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0067.2021.0528.1339 05/28/2021 [ 1968.511704] Workqueue: mhi_hiprio_wq mhi_pm_st_worker [mhi] [ 1968.511787] RIP: 0010:mhi_pm_disable_transition+0xb37/0xda0 [mhi] [ 1968.511870] Code: a9 fe ff ff 4c 89 ff 44 89 04 24 e8 03 46 f6 e5 44 8b 04 24 41 83 f8 01 0f 84 21 fe ff ff e9 4c fd ff ff 0f 0b e9 af f8 ff ff <0f> 0b e9 5c f8 ff ff 48 89 df e8 da 9e ee e3 e9 12 fd ff ff 4c 89 [ 1968.511923] RSP: 0018:ffffc900024efbf0 EFLAGS: 00010286 [ 1968.511969] RAX: 00000000ffffffff RBX: ffff88811d241250 RCX: ffffffffc0176922 [ 1968.512014] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888118a90a24 [ 1968.512059] RBP: ffff888118a90800 R08: 0000000000000000 R09: ffff888118a90a27 [ 1968.512102] R10: ffffed1023152144 R11: 0000000000000001 R12: ffff888118a908ac [ 1968.512229] R13: ffff888118a90928 R14: dffffc0000000000 R15: ffff888118a90a24 [ 1968.512310] FS: 0000000000000000(0000) GS:ffff888234200000(0000) knlGS:0000000000000000 [ 1968.512405] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1968.512493] CR2: 00007f5538f443a8 CR3: 000000016dc28001 CR4: 00000000003706e0 [ 1968.512587] Call Trace: [ 1968.512672] <TASK> [ 1968.512751] ? _raw_spin_unlock_irq+0x1f/0x40 [ 1968.512859] mhi_pm_st_worker+0x3ac/0x790 [mhi] [ 1968.512959] ? mhi_pm_mission_mode_transition.isra.0+0x7d0/0x7d0 [mhi] [ 1968.513063] process_one_work+0x86a/0x1400 [ 1968.513184] ? pwq_dec_nr_in_flight+0x230/0x230 [ 1968.513312] ? move_linked_works+0x125/0x290 [ 1968.513416] worker_thread+0x6db/0xf60 [ 1968.513536] ? process_one_work+0x1400/0x1400 [ 1968.513627] kthread+0x241/0x2d0 [ 1968.513733] ? kthread_complete_and_exit+0x20/0x20 [ 1968.513821] ret_from_fork+0x22/0x30 [ 1968.513924] </TASK> Reason is mhi_deassert_dev_wake() from mhi_device_put() is called but mhi_assert_dev_wake() from __mhi_device_get_sync() is not called in progress of recovery. Commit 8e0559921f9a ("bus: mhi: core: Skip device wake in error or shutdown state") add check for the pm_state of mhi in __mhi_device_get_sync(), and the pm_state is not the normal state untill recovery is completed, so it leads the dev_wake is not 0 and above warning print in mhi_pm_disable_transition() while checking mhi_cntrl->dev_wake. Add check in ath11k_pci_write32()/ath11k_pci_read32() to skip call mhi_device_put() if mhi_device_get_sync() does not really do wake, then the warning gone. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03003-QCAHSPSWPL_V1_V2_SILICONZ_LITE-2
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.4 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | High | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
