home *** CD-ROM | disk | FTP | other *** search
-
-
-
- cccchhhhrrrrooooooootttt((((1111MMMM)))) cccchhhhrrrrooooooootttt((((1111MMMM))))
-
-
-
- NNNNAAAAMMMMEEEE
- chroot - change root directory for a command
-
- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- cccchhhhrrrrooooooootttt newroot command
-
- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- _c_h_r_o_o_t causes the given _c_o_m_m_a_n_d to be executed relative to the new root,
- _n_e_w_r_o_o_t. The meaning of any initial slashes (////) in the pathnames is
- changed for the command and any of its child processes to _n_e_w_r_o_o_t.
- Furthermore, upon execution, the initial working directory is _n_e_w_r_o_o_t.
-
- If you redirect the output of the command to a file:
-
- _cccc_hhhh_rrrr_oooo_oooo_tttt _n_e_w_r_o_o_t _c_o_m_m_a_n_d _>>>> _x
-
- _c_h_r_o_o_t creates the file _x relative to the original root of the command,
- not the new one.
-
- The new root pathname is always relative to the current root; even if a
- _c_h_r_o_o_t is currently in effect, the _n_e_w_r_o_o_t argument is relative to the
- current root of the running process.
-
- This command can be run only by the superuser.
-
- CCCCAAAAVVVVEEEEAAAATTTT
- In order to execute programs that use shared libraries, the following
- directories and their contents must be present in the new root directory.
-
- /_l_i_b and /_l_i_b_3_2
- These directories must contain the run-time loader (/_l_i_b/_r_l_d
- and/or /_l_i_b_3_2/_r_l_d) and any shared object files needed by
- your applications (usually including _l_i_b_c._s_o._1). That means
- it must normally be in /_l_i_b and a symlink in /_u_s_r/_l_i_b to
- ../../_l_i_b/_l_i_b_c._s_o._1_P (_a_n_d _o_f_t_e_n _t_h_e _s_a_m_e _f_o_r /_u_s_r/_l_i_b_3_2 _t_o
- ../../_l_i_b_3_2/_l_i_b_c._s_o._1).
-
- ./_d_e_v The run-time loader needs the zero device in order to work
- correctly. /_d_e_v/_z_e_r_o is also needed; make it readonly (mode
- 444).
-
- A chroot can also be accomplished when users login by prefixing the shell
- field of their password entry with a ****, See the ppppaaaasssssssswwwwdddd(4) man page for
- more info.
-
- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- cd(1), chroot(2), ftpd(1m) (for more comments on issues in setting up
- chroot'ed environments), passwd(4)
-
-
-
-
-
-
-
- PPPPaaaaggggeeee 1111
-
-
-
-
-
-
- cccchhhhrrrrooooooootttt((((1111MMMM)))) cccchhhhrrrrooooooootttt((((1111MMMM))))
-
-
-
- NOTES
- Exercise extreme caution when referencing device files in the new root
- filesystem.
-
- When using _c_h_r_o_o_t, with commands that are dynamically linked, all of the
- libraries required must be in the chroot'ed environment. The system will
- usually log a message in /_v_a_r/_a_d_m/_S_Y_S_L_O_G if some libraries or _r_l_d are not
- found.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- PPPPaaaaggggeeee 2222
-
-
-
-