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Read wp-config.php located in specified WP path.
The file is tenant-owned, so open it with O_NOFOLLOW (reject a symlinked
final component) and O_NONBLOCK (open() cannot block on a FIFO with no
writer), fstat the opened fd to require a regular file (reject
FIFO/device/socket/dir), and bound the actual read to MAX_WP_CONFIG_BYTES.
The fstat st_size is only a fast-reject of an already-oversized file; it
does not bound the read, because a tenant can grow (append to) the file
after the fstat but before/while the bytes are consumed, so the read itself
must be hard-capped: pull at most MAX_WP_CONFIG_BYTES + 1 bytes and reject
if the file yielded more than the cap (a grown/sparse file), rather than
returning a truncated config that would corrupt the file on write-back.
The bytes are then split into lines exactly as the previous
open(errors='surrogateescape').readlines() did (universal-newline text
decode), so a small regular config returns the identical list of lines.
Because the type check is on the actually-opened fd it also closes the
stat-vs-open TOCTOU window. A symlinked path or a non-regular/oversized file
raises OSError, matching the missing/unreadable semantics of the previous
bare open() so callers' error handling is intact.
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