CVE-2022-49322

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

tracing: Fix sleeping function called from invalid context on RT kernel

When setting bootparams="trace_event=initcall:initcall_start tp_printk=1" in the

cmdline, the output_printk() was called, and the spin_lock_irqsave() was called in the

atomic and irq disable interrupt context suitation. On the PREEMPT_RT kernel,

these locks are replaced with sleepable rt-spinlock, so the stack calltrace will

be triggered.

Fix it by raw_spin_lock_irqsave when PREEMPT_RT and "trace_event=initcall:initcall_start

tp_printk=1" enabled.

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46

in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0

preempt_count: 2, expected: 0

RCU nest depth: 0, expected: 0

Preemption disabled at:

[<ffffffff8992303e>] try_to_wake_up+0x7e/0xba0

CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.17.1-rt17+ #19 34c5812404187a875f32bee7977f7367f9679ea7

Hardw

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References