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Added a note about new primitives for secure destruction

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2023-08-07 16:32:09 +02:00
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docs/architecture/psa-thread-safety.md
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@ -280,3 +280,5 @@ There is currently no indication of when a slot is in the WRITING state. This on
Problem: a key slot is destroyed (by `psa_wipe_key_slot`) while it's in use (READING or WRITING).
TODO: how do we ensure that? This needs something more sophisticated than mutexes (concurrency number >2)! Even a per-slot mutex isn't enough (we'd need a reader-writer lock).
Solution: after some team discussion, we've decided to rely on a new threading abstraction which mimics C11 (i.e. `mbedtls_fff` where `fff` is the C11 function name, having the same parameters and return type, with default implementations for C11, pthreads and Windows). We'll likely use condition variables in addition to mutexes.