This is "fixed" in disco - the "su" binary does no longer comes from
"shadow" here but from util-linux. And there this bug does not exist.
** Changed in: shadow (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/984390
Title:
$PATH is taken from login.defs not /etc/environment
Status in shadow package in Ubuntu:
Fix Released
Status in shadow source package in Precise:
Won't Fix
Status in shadow source package in Xenial:
New
Status in shadow source package in Bionic:
New
Bug description:
$PATH isn't sourced from /etc/environment, instead the version in
/etc/login.defs is used. (The example below comes from a precise install.)
| james@panlong:~$ echo $PATH
| /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
| james@panlong:~$ sudo su - buildd
| buildd@panlong:~$ echo $PATH
| /usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
| buildd@panlong:~$ cat /etc/environment
|
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
| buildd@panlong:~$ grep PATH /etc/login.defs
| # Three items must be defined: MAIL_DIR, ENV_SUPATH, and ENV_PATH.
| # *REQUIRED* The default PATH settings, for superuser and normal users.
| ENV_SUPATH
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
| ENV_PATH
PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
| #CRACKLIB_DICTPATH
| buildd@panlong:~$ sudo sed -i -e "s#^ENV_PATH.*#ENV_PATH
PATH=/wtf:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games#"
/etc/login.defs
| buildd@panlong:~$ logout
| james@panlong:~$ sudo su - buildd
| buildd@panlong:~$ echo $PATH
| /wtf:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
| buildd@panlong:~$
REGRESSION POTENTIAL:
- medium: it changes (incorrect) existing behaviour so https://xkcd.com/1172/
may apply
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