https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248444
Bug ID: 248444
Summary: /usr/sbin/jail crashes when parsing certain
configuration files
Product: Base System
Version: 12.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Some variable names may cause the configuration parser to crash. So far I could
only reproduce this issue with "$interface".
Example:
Setting "$interface" in two jail configurations ("crash" and "nocrash"). Using
any jail configuration but the last one ("nocrash") will crash the
configuration parser. You could have any number of crashing jails ("crash1",
"crash2", ...), but only one jail that does not crash (the bottom most one).
jail.conf:
persist;
exec.prestart = "echo '\$interface = ${interface}'";
crash {
$interface = "vr0";
}
nocrash {
$interface = "vr1";
}
How to reproduce:
# jail -f jail.conf -c crash
Segmentation fault (core dumped)
# jail -f crash.conf -c nocrash
$interface = vr1
nocrash: created
# jail -f crash.conf -r nocrash
nocrash: removed
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