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When pointing users at mount_devfs to populate the /dev of a jail,

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tell them that they also need to use devfs rules to prevent
inappropriate devices from appearing in the jail; add an Xref.  In
earlier versions of this man page, the user was instructed to use
sh MAKEDEV jail, which only created a minimal set of device nodes.
This commit is contained in:
Robert Watson 2003-06-26 19:04:15 +00:00
parent 055d177fb0
commit d82dae3ec9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=116889
1 changed files with 10 additions and 0 deletions
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10
usr.sbin/jail/jail.8
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@ -88,6 +88,15 @@ cd $D
ln -sf dev/null kernel
.Ed
.Pp
NOTE: It is important that only appropriate device nodes in devfs be
exposed to a jail; access to disk devices in the jail may permit processes
in the jail to bypass the jail sandboxing by modifying files outside of
the jail.
See
.Xr devfs 8
for information on how to use devfs rules to limit access to entries
in the per-jail devfs.
.Pp
In many cases this example would put far more stuff in the jail than is needed.
In the other extreme case a jail might contain only one single file:
the executable to be run in the jail.
@ -402,6 +411,7 @@ by setting this MIB entry to 1.
.Xr procfs 5 ,
.Xr rc.conf 5 ,
.Xr sysctl.conf 5 ,
.Xr devfs 8 ,
.Xr halt 8 ,
.Xr inetd 8 ,
.Xr jexec 8 ,