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Date:      Fri, 11 Jan 2019 20:07:05 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 234885] cmp(1) Capsicum error if stdin closed
Message-ID:  <bug-234885-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234885

            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@FreeBSD.org
          Reporter: naddy@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=3D0, and=
 a
subsequent fstat(0, ...) produces the error.


I found this because GNU tar 1.31's test suite includes some test scripts t=
hat,
for whatever reason, close stdin (exec <&-) and later call cmp.

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