https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282995
Bug ID: 282995
Summary: mountd doesn't limit export with -alldirs
Product: Base System
Version: 14.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: m...@jellydonut.org
Found this while testing some NFS export operations, initially reported
https://lists.freebsd.org/archives/freebsd-stable/2024-November/002531.html
mountd doesn't limit exports to a filesystem mountpoint when -alldirs is
enabled. Per exports(5):
EXAMPLES
...
/cdrom -alldirs,quiet,ro -network 192.168.33.0 -mask 255.255.255.0
...
The file system rooted at /cdrom will be exported read-only to the entire
network 192.168.33.0/24, including all its subdirectories. Since /cdrom
is the conventional mountpoint for a CD-ROM device, this export will fail
if no CD-ROM medium is currently mounted there since that line would then
attempt to export a subdirectory of the root file system with the
-alldirs option which is not allowed. The -quiet option will then
suppress the error message for this condition that would normally be
syslogged. As soon as an actual CD-ROM is going to be mounted, mount(8)
will notify mountd(8) about this situation, and the /cdrom file system
will be exported as intended. Note that without using the -alldirs
option, the export would always succeed. While there is no CD-ROM medium
mounted under /cdrom, it would export the (normally empty) directory
/cdrom of the root file system instead.
mountd is currnetly not working as indicated. If /cdrom is exported via mountd
and is not at the time a filesystem mount-point, the root filesystem (/) is
exported instead with the mountd warning:
Nov 20 22:34:56 zfstest1 mountd[27724]: Warning: exporting /cdrom
exports entire / file system
More details provided via the lists link above
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