NAME
setpriv - run a program with different Linux privilege settings SYNOPSIS setpriv [options] program [arguments] DESCRIPTION Sets or queries various Linux privilege settings that are inherited across execve(2). OPTION
-d, dump Dumps current privilege state. Specify more than once to show extra, mostly useless, information. Incompatible with all other options.
no-new-privs Sets the nonewprivs bit. With this bit set, execve(2) will not grant new privileges. For example, the setuid and setgid bits as well as file capabilities will be disabled. (Executing binaries with these bits set will still work, but they will not gain privilege. Certain LSMs, especially AppArmor, may result in failures to execute certain programs.) This bit is inherited by child processes and cannot be unset. See prctl(2) and Docu‐ mentation/prctl/nonewprivs.txt in the Linux kernel source. The nonewprivs bit is supported since Linux 3.5.
inh-caps (+|-)cap,... or bounding-set (+|-)cap,... Sets inheritable capabilities or capability bounding set. See
capabilities(7). The argument is a comma-separated list of +cap
and -cap entries, which add or remove an entry respectively.
+all and -all can be used to add or remove all caps. The set of capabilities starts out as the current inheritable set for
inh-caps and the current bounding set for bounding-set. If you drop something from the bounding set without also dropping it from the inheritable set, you are likely to become confused. Do not do that.
list-caps Lists all known capabilities. Must be specified alone. ruid uid, euid uid, reuid uid Sets the real, effective, or both uids. Setting uid or gid does not change capabilities, although the exec call at the end might change capabilities. This means that, if you are root, you probably want to do something like:
reuid=1000 regid=1000 caps=-all rgid gid, egid gid, regid gid Sets the real, effective, or both gids.
For safety, you must specify one of keep-groups, clear- groups, or groups if you set any primary gid.
clear-groups Clears supplementary groups.
keep-groups Preserves supplementary groups. Only useful in conjunction with rgid, egid, or regid. groups group,... Sets supplementary groups.
securebits (+|-)securebit,... Sets or clears securebits. The valid securebits are noroot, norootlocked, nosetuidfixup, nosetuidfixuplocked, and keepcapslocked. keepcaps is cleared by execve(2) and is therefore not allowed.
selinux-label label Requests a particular SELinux transition (using a transition on exec, not dyntrans). This will fail and cause setpriv(1) to abort if SELinux is not in use, and the transition may be ignored or cause execve(2) to fail at SELinux's whim. (In par‐ ticular, this is unlikely to work in conjunction with nonew privs.) This is similar to runcon(1).
apparmor-profile profile Requests a particular AppArmor profile (using a transition on exec). This will fail and cause setpriv(1) to abort if AppArmor is not in use, and the transition may be ignored or cause execve(2) to fail at AppArmor's whim.
-V, version Display version information and exit.
-h, help Display help and exit. NOTES If applying any specified option fails, program will not be run and setpriv will return with exit code 127. Be careful with this tool it may have unexpected security conse‐ quences. For example, setting nonewprivs and then execing a program
that is SELinux-confined (as this tool would do) may prevent the SELinux restrictions from taking effect. SEE ALSO prctl(2), capability(7) AUTHOR Andy Lutomirski ⟨luto@amacapital.net⟩ AVAILABILITY
The setpriv command is part of the util-linux package and is available
from Linux Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util- linux/⟩.
util-linux January 2013 SETPRIV(1)