Fedora 39: FEDORA-2023-1b25e7d001 Urgent: Pmix Concurrency Flaw

The Process Management Interface (PMI) has been used for quite some time as

a means of exchanging wireup information needed for interprocess

communication. Two versions (PMI-1 and PMI-2) have been released as part of

the MPICH effort. While PMI-2 demonstrates better scaling properties than its

PMI-1 predecessor, attaining rapid launch and wireup of the roughly 1M

processes executing across 100k nodes expected for exascale operations remains

challenging.

PMI Exascale (PMIx) represents an attempt to resolve these questions by

providing an extended version of the PMI standard specifically designed to

support clusters up to and including exascale sizes. The overall objective of

the project is not to branch the existing pseudo-standard definitions - in

fact, PMIx fully supports both of the existing PMI-1 and PMI-2 APIs - but

rather to (a) augment and extend those APIs to eliminate some current

restrictions that impact scalability, and (b) provide a reference

implementation of the PMI-server that demonstrates the desired level of

scalability.

Security fix for CVE-2023-41915