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Changelog entry for the union initialization fixes

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2025-02-05 20:33:15 +01:00
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ChangeLog.d/union-initialization.txt Normal file
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Bugfix
* Fix failures of PSA multipart or interruptible operations when the
library or the application is built with a compiler where
"union foo x = {0}" does not initialize non-default members of the
union, such as GCC 15 and some versions of Clang 18. This affected MAC
multipart operations, MAC-based key derivation operations, interruptible
signature, interruptible verification, and potentially other operations
when using third-party drivers. This also affected one-shot MAC
operations using the built-in implementation. Fixes #9814.
* On entry to PSA driver entry points that set up a multipart operation
("xxx_setup"), the operation object is supposed to be all-bits-zero.
This was sometimes not the case when an operation object is reused,
or with compilers where "union foo x = {0}" does not initialize
non-default members of the union. The PSA core now ensures that this
guarantee is met in all cases. Fixes #9975.