1/* chroot.c - Run command in new root directory. 2 * 3 * Copyright 2007 Rob Landley <rob@landley.net> 4 * 5 * TODO: The test for root is "==" so root can trivially escape a chroot by 6 * moving it below cwd, ala mkdir("sub"); chroot("sub"); chdir("../../../..") 7 * The container guys use pivot_root() to deal with this, which does actually 8 * edit mount tree. (New option? Kernel patch?) 9 10USE_CHROOT(NEWTOY(chroot, "^<1", TOYFLAG_USR|TOYFLAG_SBIN|TOYFLAG_ARGFAIL(125))) 11 12config CHROOT 13 bool "chroot" 14 default y 15 help 16 usage: chroot NEWROOT [COMMAND [ARG...]] 17 18 Run command within a new root directory. If no command, run /bin/sh. 19*/ 20 21#include "toys.h" 22 23void chroot_main(void) 24{ 25 char *binsh[] = {"/bin/sh", "-i", 0}; 26 27 if (chdir(*toys.optargs) || chroot(".")) { 28 toys.exitval = 125; 29 perror_exit_raw(*toys.optargs); 30 } 31 if (toys.optargs[1]) xexec(toys.optargs+1); 32 else xexec(binsh); 33} 34