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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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24
scripts/config.py
View file

@ -183,6 +183,7 @@ EXCLUDE_FROM_FULL = frozenset([
'MBEDTLS_NO_UDBL_DIVISION', # variant toggle
'MBEDTLS_PKCS11_C', # build dependecy (libpkcs11-helper)
'MBEDTLS_PLATFORM_NO_STD_FUNCTIONS', # removes a feature
'MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT', # similar to non-platform xxx_ALT, requires platform_alt.h
'MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER', # variant toggle
'MBEDTLS_PSA_CRYPTO_SE_C',
'MBEDTLS_PSA_CRYPTO_SPM', # platform dependency (PSA SPM)
@ -200,18 +201,26 @@ EXCLUDE_FROM_FULL = frozenset([
'MBEDTLS_ZLIB_SUPPORT', # build dependency (libz)
])
def is_seamless_alt(name):
"""Include xxx_ALT symbols that don't have external dependencies.
Include alternative implementations of platform functions, which are
configurable function pointers that default to the built-in function.
This way we test that the function pointers exist and build correctly
without changing the behavior, and tests can verify that the function
pointers are used by modifying those pointers.
Exclude alternative implementations of library functions since they require
an implementation of the relevant functions and an xxx_alt.h header.
"""
return name.startswith('MBEDTLS_PLATFORM_')
def include_in_full(name):
"""Rules for symbols in the "full" configuration."""
if re.search(r'PLATFORM_[A-Z0-9]+_ALT', name):
# Include configurable functions that default to the built-in function.
# This way we test that they're in place without changing the behavior.
return True
if name in EXCLUDE_FROM_FULL:
return False
if name.endswith('_ALT'):
# Exclude alt implementations since they require an implementation
# of the relevant functions.
return False
return is_seamless_alt(name)
return True
def full_adapter(name, active, section):
@ -235,6 +244,7 @@ EXCLUDE_FROM_BAREMETAL = frozenset([
'MBEDTLS_HAVE_TIME_DATE', # requires a clock
'MBEDTLS_NET_C', # requires POSIX-like networking
'MBEDTLS_PLATFORM_FPRINTF_ALT', # requires FILE* from stdio.h
'MBEDTLS_PLATFORM_NV_SEED_ALT', # requires a filesystem
'MBEDTLS_PLATFORM_TIME_ALT', # requires timing
'MBEDTLS_PSA_CRYPTO_SE_C', # requires a filesystem
'MBEDTLS_PSA_CRYPTO_STORAGE_C', # requires a filesystem

4
tests/scripts/all.sh
View file

@ -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 .