CVE-2022-50382

About vulnerability

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

padata: Always leave BHs disabled when running ->parallel()

A deadlock can happen when an overloaded system runs ->parallel() in the context of the current task:

padata_do_parallel ->parallel() pcrypt_aead_enc/dec padata_do_serial spin_lock(&reorder->lock) // BHs still enabled … __do_softirq … padata_do_serial spin_lock(&reorder->lock)

It’s a bug for BHs to be on in _do_serial as Steffen points out, so ensure they’re off in the “current task” case like they are in padata_parallel_worker to avoid this situation.

Affected product:

AlmaLinux 9.2 ESU , TuxCare 9.6 ESU

Affected packages:

kernel @ 5.14.0 (+1 more)

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

padata: Always leave BHs disabled when running ->parallel()

A deadlock can happen when an overloaded system runs ->parallel() in the context of the current task:

padata_do_parallel ->parallel() pcrypt_aead_enc/dec padata_do_serial spin_lock(&reorder->lock) // BHs still enabled … __do_softirq … padata_do_serial spin_lock(&reorder->lock)

It’s a bug for BHs to be on in _do_serial as Steffen points out, so ensure they’re off in the “current task” case like they are in padata_parallel_worker to avoid this situation.