[Bug 234885] cmp(1) Capsicum error if stdin closed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234885

            Bug ID: 234885
           Summary: cmp(1) Capsicum error if stdin closed
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: naddy at FreeBSD.org

cmp(1) errors out with a Capsicum error when called with stdin closed:

$ sh -c 'cmp /bin/ls /bin/cat <&-'
cmp: /bin/ls: Capabilities insufficient

Since fd 0 is closed, open() of the first file argument returns fd=0, and a
subsequent fstat(0, ...) produces the error.


I found this because GNU tar 1.31's test suite includes some test scripts that,
for whatever reason, close stdin (exec <&-) and later call cmp.

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