ASN1_STRING_to_UTF8() passes an ASN1_STRING to ASN1_STRING_set() but forgot to
initialize the `length` field.
Fixes the following valgrind error:
$ valgrind -q --track-origins=yes --num-callers=19 \
out/Debug/node test/simple/test-tls-client-abort.js
==2690== Conditional jump or move depends on uninitialised value(s)
==2690== at 0x784B69: ASN1_STRING_set (asn1_lib.c:382)
==2690== by 0x809564: ASN1_mbstring_ncopy (a_mbstr.c:204)
==2690== by 0x8090F0: ASN1_mbstring_copy (a_mbstr.c:86)
==2690== by 0x782F1F: ASN1_STRING_to_UTF8 (a_strex.c:570)
==2690== by 0x78F090: asn1_string_canon (x_name.c:409)
==2690== by 0x78EF17: x509_name_canon (x_name.c:354)
==2690== by 0x78EA7D: x509_name_ex_d2i (x_name.c:210)
==2690== by 0x788058: ASN1_item_ex_d2i (tasn_dec.c:239)
==2690== by 0x7890D4: asn1_template_noexp_d2i (tasn_dec.c:746)
==2690== by 0x788CB6: asn1_template_ex_d2i (tasn_dec.c:607)
==2690== by 0x78877A: ASN1_item_ex_d2i (tasn_dec.c:448)
==2690== by 0x7890D4: asn1_template_noexp_d2i (tasn_dec.c:746)
==2690== by 0x788CB6: asn1_template_ex_d2i (tasn_dec.c:607)
==2690== by 0x78877A: ASN1_item_ex_d2i (tasn_dec.c:448)
==2690== by 0x787C93: ASN1_item_d2i (tasn_dec.c:136)
==2690== by 0x78F5E4: d2i_X509 (x_x509.c:141)
==2690== by 0x7C9B91: PEM_ASN1_read_bio (pem_oth.c:81)
==2690== by 0x7CA506: PEM_read_bio_X509 (pem_x509.c:67)
==2690== by 0x703C9A: node::crypto::SecureContext::AddRootCerts(v8::Arguments const&) (node_crypto.cc:497)
==2690== Uninitialised value was created by a stack allocation
==2690== at 0x782E89: ASN1_STRING_to_UTF8 (a_strex.c:560)
* valgrind complained too much about memory leaks from the V8 heap to be
useful, run it with --leak-check=no. Not ideal, needs to be revisited,
preferably with a suppression file.
* tools/run-valgrind.py didn't deal with tests that logged to stderr, rewrite
the heuristic and make valgrind write to a socket instead of stderr.
Fixes#3869.
Compile at -O2 and disable optimizations that trigger gcc bugs.
Some people still reported mksnapshot crashes after commit b40f813 ("build: fix
spurious mksnapshot crashes for good" - so much for that).
Average performance of the -O2 binary is on par with the -O3 binary. Variance
on the http_simple bytes/8 benchmark appears to be slightly greater but small
enough that the possibly of it being noise cannot be excluded.
The new binary very slightly but consistently outperforms the -O3 binary (by
about 0.5%) on the mostly CPU-bound bytes/102400 benchmark. That could be an
artifact of the system I benchmarked it on, a Core 2 Duo with a puny 32 kB of
L1 instruction cache. The smaller binary seems to play nicer with the cache.