CVE-2022-50382: falha de média gravidade em Linux
padata: Always leave BHs disabled when running ->parallel()
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13Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 5.5epss 0.1%
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
<interrupt>
...
__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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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Referências
https://git.kernel.org/stable/c/17afa98bccec4f52203508b3f49b5f948c6fd6achttps://git.kernel.org/stable/c/34c3a47d20ae55b3600fed733bf96eafe9c500d5https://git.kernel.org/stable/c/6cfa9e60c0f88fdec6368e081ab968411cc706b1https://git.kernel.org/stable/c/7337adb20fcc0aebb50eaff2bc5a8dd9a7c6743dhttps://git.kernel.org/stable/c/8e0681dd4eee029eb1d533d06993f7cb091efb73