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Subject: [Bug 221987] ZFS does not validate the sharenfs parameter
Date: Fri, 01 Sep 2017 22:43:02 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221987

            Bug ID: 221987
           Summary: ZFS does not validate the sharenfs parameter
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

On Illumos, ZFS will validate that the "sharenfs" parameter is valid.  It w=
ill
refuse to set it to an invalid value.  But FreeBSD does not validate it.  T=
his
could cause mountd to crash or misbehave.

Note that this is _not_ a security vulnerability, even in combination with =
ZFS
delegations, because /etc/zfs/exports may only be updated by root, even when
the sharenfs property is delegated.

$ sudo zpool create foo da0
$ sudo zfs set sharenfs=3D$'XXX\n/usr/home' foo
$ sudo cat /etc/zfs/exports=20
# !!! DO NOT EDIT THIS FILE MANUALLY !!!

/foo    XXX
/usr/home

--=20
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