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Document PSA's need for threading

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine
2025-03-11 15:04:05 +01:00
parent 2153b1bc03
commit 012ebb01f9
1 changed files with 34 additions and 4 deletions
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38
include/mbedtls/config.h
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@@ -2290,6 +2290,10 @@
* That is, the APIs enabled by this option are not covered by the usual
* promises of API stability.
*
* \warning In multithreaded applications, you must also enable
* #MBEDTLS_THREADING_C, unless only one thread ever calls PSA functions
* (`psa_xxx()`), including indirect calls through SSL/TLS, X.509 or PK.
*
* Requires: MBEDTLS_PSA_CRYPTO_C.
*
* Uncomment this to enable internal use of PSA Crypto and new associated APIs.
@@ -3389,6 +3393,14 @@
*
* Enable the Platform Security Architecture cryptography API.
*
* \note In multithreaded applications, you must enable #MBEDTLS_THREADING_C,
* unless only one thread ever calls `psa_xxx()` functions.
* That includes indirect calls, such as:
* - indirect calls from PK, X.509 or SSL functions when
* #MBEDTLS_USE_PSA_CRYPTO is enabled;
* - any other call to a function that requires calling psa_crypto_init()
* beforehand.
*
* Module: library/psa_crypto.c
*
* Requires: either MBEDTLS_CTR_DRBG_C and MBEDTLS_ENTROPY_C,
@@ -3605,11 +3617,29 @@
/**
* \def MBEDTLS_THREADING_C
*
* Enable the threading abstraction layer.
* By default Mbed TLS assumes it is used in a non-threaded environment or that
* contexts are not shared between threads. If you do intend to use contexts
* Traditionally, Mbed TLS assumes it is used in a non-threaded environment or
* that contexts are not shared between threads. If you do intend to use contexts
* between threads, you will need to enable this layer to prevent race
* conditions. See also our Knowledge Base article about threading:
* conditions.
*
* The PSA subsystem has an implicit shared context. Therefore, you must
* enable this option if more than one thread may use any part of
* Mbed TLS that is implemented on top of the PSA subsystem.
*
* You must enable this option in multithreaded applications where more than
* one thread performs any of the following operations:
*
* - Any call to a PSA function (`psa_xxx()`).
* - Any call to a TLS, X.509 or PK function (`mbedtls_ssl_xxx()`,
* `mbedtls_x509_xxx()`, `mbedtls_pkcs7_xxx()`, `mbedtls_pk_xxx()`)
* if `MBEDTLS_USE_PSA_CRYPTO` is enabled (regardless of whether individual
* TLS, X.509 or PK contexts are shared between threads).
* - Any use of a cryptographic context if the same context is used in
* multiple threads.
* - Any call to a function where the documentation specifies that
* psa_crypto_init() must be called prior to that function.
*
* See also our Knowledge Base article about threading:
* https://mbed-tls.readthedocs.io/en/latest/kb/development/thread-safety-and-multi-threading
*
* Module: library/threading.c