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Add setbuf platform function

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Add a platform function mbedtls_setbuf(), defaulting to setbuf().

The intent is to allow disabling stdio buffering when reading or writing
files with sensitive data, because this exposes the sensitive data to a
subsequent memory disclosure vulnerability.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-06-30 17:01:40 +02:00
parent a745c7d439
commit 6497b5a1d1
5 changed files with 101 additions and 0 deletions
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tests/scripts/all.sh
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@ -2178,6 +2178,7 @@ component_test_no_platform () {
scripts/config.py unset MBEDTLS_PLATFORM_SNPRINTF_ALT
scripts/config.py unset MBEDTLS_PLATFORM_TIME_ALT
scripts/config.py unset MBEDTLS_PLATFORM_EXIT_ALT
scripts/config.py unset MBEDTLS_PLATFORM_SETBUF_ALT
scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
scripts/config.py unset MBEDTLS_FS_IO