1 /* chroot.c - Run command in new root directory. 2 * 3 * Copyright 2007 Rob Landley <rob (at) 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 10 USE_CHROOT(NEWTOY(chroot, "^<1", TOYFLAG_USR|TOYFLAG_SBIN)) 11 12 config CHROOT 13 bool "chroot" 14 default y 15 help 16 usage: chroot NEWPATH [commandline...] 17 18 Run command within a new root directory. If no command, run /bin/sh. 19 */ 20 21 #include "toys.h" 22 23 void chroot_main(void) 24 { 25 char *binsh[] = {"/bin/sh", "-i", 0}; 26 27 if (chdir(*toys.optargs) || chroot(".")) perror_exit_raw(*toys.optargs); 28 if (toys.optargs[1]) xexec(toys.optargs+1); 29 else xexec(binsh); 30 } 31
