DO-178C files and configurations for review (DON'T merge)#1
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tmael
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Apr 14, 2020
RSA PKCS #1.5 padding for signing is not reliant on a random.
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otherwise if profile_str_len is > strlen(gSrtpProfiles[i].name) we end up
comparing memory past gSrtpProfiles[i].name. -fsanitize=address catches this:
```
==100159==ERROR: AddressSanitizer: global-buffer-overflow on address 0x7f40d8d533b2 at pc 0x7f40d8eb014f bp 0x7f40d50fe240 sp 0x7f40d50fd9e8
READ of size 21 at 0x7f40d8d533b2 thread T107
#0 0x7f40d8eb014e in MemcmpInterceptorCommon(void*, int (*)(void const*, void const*, unsigned long), void const*, void const*, unsigned long) /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:860
#1 0x7f40d8eb06e6 in __interceptor_memcmp /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:892
#2 0x7f40d8eb06e6 in __interceptor_memcmp /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:887
#3 0x7f40d8c2e830 in DtlsSrtpFindProfile src/ssl.c:1310
#4 0x7f40d8c2e9ed in DtlsSrtpSelProfiles src/ssl.c:1347
#5 0x7f40d8c2eada in wolfSSL_CTX_set_tlsext_use_srtp src/ssl.c:1359
#6 0x563bf381b4c5 in server_test examples/server/server.c:2278
wolfSSL#7 0x7f40d88f0258 in start_thread (/usr/lib/libpthread.so.0+0x9258)
wolfSSL#8 0x7f40d88195e2 in __GI___clone (/usr/lib/libc.so.6+0xfe5e2)
```
tmael
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Jun 9, 2026
1. BasicConstraints pathLenConstraint absent vs. 0 — get_ext_d2i/set_ext/V3_EXT_d2i now distinguish "no constraint" from 0 per RFC 5280 §4.2.1.9, using the existing basicConstPlSet flag. 2. GENERAL_NAME_print GEN_DIRNAME — added missing return-value normalization so the directory name is actually printed (was emitting only DirName:). 3. GENERAL_NAME_print GEN_DNS — use ASN1_STRING_print like the EMAIL/URI cases, avoiding NULL-strData deref and NUL-truncation. 4. X509_print BasicConstraints — print , pathlen:N to match OpenSSL. 5. X509_print Extended Key Usage — print Any Extended Key Usage (was omitted). 6. get_ext_d2i CRL_DIST_OID double-free — null gn immediately after ownership transfers to dp, so an error from the next push doesn't free it twice. 7. X509V3_EXT_print SAN truncation/failure — match XSNPRINTF size cap to the allocation; was truncating at indent==1 and failing at indent>=2. 8. X509V3_EXT_print AUTH_KEY/SUBJ_KEY NULL deref — NULL-check i2s_ASN1_STRING return before passing to %s. 9. X509_add_ext SAN type confusion — reject DIRNAME/RID/X400/EDIPARTY; only the ASN1_STRING*-backed types are read via gn->d.ia5. Was performing a wild-pointer XMEMCPY in add_altname_ex. Also: extracted the SAN and WOLFSSL_CUSTOM_OID arms of X509_add_ext into static helpers (behavior-preserving). Regression tests added for #1–5 and wolfSSL#9; existing GENERAL_NAME_print test hardened (gives GEN_DIRNAME a real directoryName, eliminating an OOB read that the print fix would otherwise expose).
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32-bit, C only
Source files to certify:
sha256_cert.c
aes_cert.c
sp_int.c
sp_c32.c
random.c
rsa_cert.c
asn_cert.c
misc.c
chacha_cert.c
poly1305_cert.c
chacha20_poly1305.c
Tested with segger project for RISC-V and Cortex-M based boards
Autotools build in Ubuntu