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Document and fix the MBEDTLS_xxx_ALT logic for the full config

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The intended logic around MBEDTLS_xxx_ALT is to exclude them from full
because they require the alternative implementation of one or more
library functions, except that MBEDTLS_PLATFORM_xxx_ALT are different:
they're alternative implementations of a platform function and they
have a built-in default, so they should be included in full. Document
this.

Fix a bug whereby MBEDTLS_PLATFORM_xxx_ALT didn't catch symbols where
xxx contains an underscore. As a consequence,
MBEDTLS_PLATFORM_GMTIME_R_ALT and MBEDTLS_PLATFORM_NV_SEED_ALT are now
enabled in the full config. Explicitly exclude
MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT because it behaves like the
non-platform ones, requiring an extra build-time dependency.
Explicitly exclude MBEDTLS_PLATFORM_NV_SEED_ALT from baremetal
because it requires MBEDTLS_ENTROPY_NV_SEED, and likewise explicitly
unset it from builds that unset MBEDTLS_ENTROPY_NV_SEED.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-04-12 23:43:28 +02:00
parent cfffc28a80
commit 32e889dfc3
2 changed files with 21 additions and 7 deletions
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4
tests/scripts/all.sh
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@ -1023,6 +1023,7 @@ component_test_check_params_without_platform () {
scripts/config.py unset MBEDTLS_PLATFORM_TIME_ALT
scripts/config.py unset MBEDTLS_PLATFORM_FPRINTF_ALT
scripts/config.py unset MBEDTLS_PLATFORM_MEMORY
scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
scripts/config.py unset MBEDTLS_PLATFORM_PRINTF_ALT
scripts/config.py unset MBEDTLS_PLATFORM_SNPRINTF_ALT
scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
@ -1052,6 +1053,7 @@ 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_NV_SEED_ALT
scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
scripts/config.py unset MBEDTLS_FS_IO
scripts/config.py unset MBEDTLS_PSA_CRYPTO_SE_C
@ -1069,6 +1071,7 @@ component_build_no_std_function () {
scripts/config.py full
scripts/config.py set MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
make CC=gcc CFLAGS='-Werror -Wall -Wextra -Os'
}
@ -1252,6 +1255,7 @@ component_test_null_entropy () {
scripts/config.py set MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
scripts/config.py set MBEDTLS_ENTROPY_C
scripts/config.py unset MBEDTLS_ENTROPY_NV_SEED
scripts/config.py unset MBEDTLS_PLATFORM_NV_SEED_ALT
scripts/config.py unset MBEDTLS_ENTROPY_HARDWARE_ALT
scripts/config.py unset MBEDTLS_HAVEGE_C
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan -D UNSAFE_BUILD=ON .