[Bug 293353] No overflow handling in the strnlen function

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293353

            Bug ID: 293353
           Summary: No overflow handling in the strnlen function
           Product: Base System
           Version: Unspecified
          Hardware: riscv
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: riscv
          Assignee: riscv@FreeBSD.org
          Reporter: maxim.like.python@gmail.com

I found that there is no overflow check in the strnlen function. In the code
that I was trying to run, there is a strnlen(buf, MAX_SIZE_T) expression, the
result of which on riscv differs from other architectures.

After looking at the strnlen assembly code, the lack of overflow handling
became apparent.

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