Fix wherelen handling in BIO_ADDR_rawmake AF_UNIX path

[samuel40791765]

Issues:

Addresses V2196133741

Description of changes:

Two issues in the AF_UNIX branch of BIO_ADDR_rawmake:

1. wherelen + 1 > sizeof(...) wraps to 0 when wherelen == SIZE_MAX, bypassing the bound check. Rewritten as wherelen >= sizeof(...).
2. OPENSSL_strlcpy(dst, src, wherelen) treats its third argument as the destination buffer size, not the number of source bytes, so only wherelen - 1 bytes were copied and src was required to be NUL-terminated even though the comment above states it isn't. Replaced with OPENSSL_memcpy; the preceding OPENSSL_cleanse of ap->s_un already leaves a trailing NUL.

Call-outs:

None.

Testing:

Existing bio_socket_test cases continue to pass.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.29%. Comparing base (9651480) to head (f13b21f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3233      +/-   ##
==========================================
+ Coverage   78.12%   78.29%   +0.17%     
==========================================
  Files         689      689              
  Lines      123214   123217       +3     
  Branches    17137    17141       +4     
==========================================
+ Hits        96257    96476     +219     
+ Misses      26047    25829     -218     
- Partials      910      912       +2     

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