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Full Discussion: Find and EXECDIR option
Top Forums UNIX for Dummies Questions & Answers Find and EXECDIR option Post 302341369 by mojoman on Wednesday 5th of August 2009 05:40:26 PM
Old 08-05-2009
Find and EXECDIR option

Hello,

I was reading the man pages of find and it says that the -exec option should not be used. I read the following about the recommended option, -execdir:

Code:
 -execdir command {} +
              Like -exec, but the specified command is run from the  subdirec‐
              tory  containing  the  matched  file,  which is not normally the
              directory in which you started find.  This a  much  more  secure
              method  for invoking commands, as it avoids race conditions dur‐
              ing resolution of the paths to the matched files.  As  with  the
              -exec option, the '+' form of -execdir will build a command line
              to process more than one matched file, but any given  invocation
              of command will only list files that exist in the same subdirec‐
              tory.  If you use this option, you must ensure that  your  $PATH
              environment  variable  does not reference the current directory;
              otherwise, an attacker can run any commands they like by leaving
              an appropriately-named file in a directory in which you will run
              -execdir.

I do not really follow the explanation well.

Question 1: What is this race condition they arte talking about?
Question 2: Why if a hacker leaves a file in a directory that the execdir will examine poses a risk? Does the execdir option RUN every file?
 

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DH_INSTALL(1)							     Debhelper							     DH_INSTALL(1)

NAME
dh_install - install files into package build directories SYNOPSIS
dh_install [-Xitem] [--autodest] [--sourcedir=dir] [debhelperoptions] [file|dir...destdir] DESCRIPTION
dh_install is a debhelper program that handles installing files into package build directories. There are many dh_install* commands that handle installing specific types of files such as documentation, examples, man pages, and so on, and they should be used when possible as they often have extra intelligence for those particular tasks. dh_install, then, is useful for installing everything else, for which no particular intelligence is needed. It is a replacement for the old dh_movefiles command. This program may be used in one of two ways. If you just have a file or two that the upstream Makefile does not install for you, you can run dh_install on them to move them into place. On the other hand, maybe you have a large package that builds multiple binary packages. You can use the upstream Makefile to install it all into debian/tmp, and then use dh_install to copy directories and files from there into the proper package build directories. From debhelper compatibility level 7 on, dh_install will fall back to looking in debian/tmp for files, if it does not find them in the current directory (or wherever you've told it to look using --sourcedir). FILES
debian/package.install List the files to install into each package and the directory they should be installed to. The format is a set of lines, where each line lists a file or files to install, and at the end of the line tells the directory it should be installed in. The name of the files (or directories) to install should be given relative to the current directory, while the installation directory is given relative to the package build directory. You may use wildcards in the names of the files to install. Note that if you list exactly one filename or wildcard-pattern on a line by itself, with no explicit destination, then dh_install will automatically guess the destination to use, the same as if the --autodest option were used. debian/not-installed Used with the deprecated --list-missing and --fail-missing options. Please refer to dh_missing(1) for the documentation of this file. OPTIONS
--list-missing Deprecated: Please use dh_missing --list-missing instead. If you use this option, dh_install will call dh_missing with that option after it has processed all the files. Please see dh_missing(1) for the documentation of this option. This option is removed in compat 12. --fail-missing Deprecated: Please use dh_missing --fail-missing instead. If you use this option, dh_install will call dh_missing with that option after it has processed all the files. Please see dh_missing(1) for the documentation of this option. This option is removed in compat 12. --sourcedir=dir Look in the specified directory for files to be installed. Note that this is not the same as the --sourcedirectory option used by the dh_auto_* commands. You rarely need to use this option, since dh_install automatically looks for files in debian/tmp in debhelper compatibility level 7 and above. --autodest Guess as the destination directory to install things to. If this is specified, you should not list destination directories in debian/package.install files or on the command line. Instead, dh_install will guess as follows: Strip off debian/tmp (or the sourcedir if one is given) from the front of the filename, if it is present, and install into the dirname of the filename. So if the filename is debian/tmp/usr/bin, then that directory will be copied to debian/package/usr/. If the filename is debian/tmp/etc/passwd, it will be copied to debian/package/etc/. file|dir ... destdir Lists files (or directories) to install and where to install them to. The files will be installed into the first package dh_install acts on. LIMITATIONS
dh_install cannot rename files or directories, it can only install them with the names they already have into wherever you want in the package build tree. However, renaming can be achieved by using dh-exec with compatibility level 9 or later. An example debian/package.install file using dh- exec could look like: #!/usr/bin/dh-exec debian/default.conf => /etc/my-package/start.conf Please remember the following three things: o The package must be using compatibility level 9 or later (see debhelper(7)) o The package will need a build-dependency on dh-exec. o The install file must be marked as executable. SEE ALSO
debhelper(7) This program is a part of debhelper. AUTHOR
Joey Hess <joeyh@debian.org> 11.1.6ubuntu2 2018-05-10 DH_INSTALL(1)
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