Noah Goldstein e3255e7d21 x86: Fix wcsnlen-avx2 page cross length comparison [BZ #29591]
Previous implementation was adjusting length (rsi) to match
bytes (eax), but since there is no bound to length this can cause
overflow.

Fix is to just convert the byte-count (eax) to length by dividing by
sizeof (wchar_t) before the comparison.

Full check passes on x86-64 and build succeeds w/ and w/o multiarch.

(cherry picked from commit b0969fa53a28b4ab2159806bf6c99a98999502ee)
2022-11-24 14:42:41 -08:00
..
2021-04-19 17:46:05 -07:00