diff --git a/ChangeLog.d/psa-shared-memory-protection.txt b/ChangeLog.d/psa-shared-memory-protection.txt new file mode 100644 index 000000000..09779b7d2 --- /dev/null +++ b/ChangeLog.d/psa-shared-memory-protection.txt @@ -0,0 +1,17 @@ +Security + * Passing buffers that are stored in untrusted memory as arguments + to PSA functions is now secure by default. + The PSA core now protects against modification of inputs or exposure + of intermediate outputs during operations. This is currently implemented + by copying buffers. + This feature increases code size and memory usage. If buffers passed to + PSA functions are owned exclusively by the PSA core for the duration of + the function call (i.e. no buffer parameters are in shared memory), + copying may be disabled by setting MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS. + Note that setting this option will cause input-output buffer overlap to + be only partially supported (#3266). + Fixes CVE-2024-28960 +Bugfix + * Fully support arbitrary overlap between inputs and outputs of PSA + functions. Note that overlap is still only partially supported when + MBEDTLS_PSA_ASSUME_EXCLUSIVE_BUFFERS is set (#3266).