[Bug 230120] capsicum: cap_ftruncate_rights doesn't work in 32-bit emulation

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230120

            Bug ID: 230120
           Summary: capsicum: cap_ftruncate_rights doesn't work in 32-bit
                    emulation
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

I don't know why, but cap_ftruncate_rights doesn't appear to work in 32-bit
emulation.  The bug can be reproduced by running i386's dd binary on a 64-bit
kernel:

$ /bin/dd if=/dev/zero of=1.file bs=1 count=1 oseek=1 conv=sparse
1+0 records in
1+0 records out
1 bytes transferred in 0.000235 secs (4263 bytes/sec)

$ /root32/bin/dd if=/dev/zero of=1.file bs=1 count=1 oseek=1 conv=sparse
dd: truncating 1.file: Not permitted in capability mode
1+0 records in
1+0 records out
1 bytes transferred in 0.000111 secs (9035 bytes/sec)

There doesn't appear to be anything obviously wrong with the code in either dd
or kern_ftruncate, so I think it's a deeper capsicum bug.

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