emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

sulogin: increase util-linux compatibility

Browse Source 
Change to root's HOME. Set some envvars. Steal ctty if necessary and possible.

function                                             old     new   delta
sulogin_main                                         240     340    +100
setup_environment                                    225     233      +8
su_main                                              479     474      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 108/-5)            Total: 103 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2022-01-12 23:19:11 +01:00
parent 004cefa918
commit d162a7b978
3 changed files with 37 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
include/libbb.h
View File

@@ -1726,15 +1726,16 @@ extern void selinux_or_die(void) FAST_FUNC;
/* setup_environment:
* if chdir pw->pw_dir: ok: else if to_tmp == 1: goto /tmp else: goto / or die
* if clear_env = 1: cd(pw->pw_dir), clear environment, then set
* if !SETUP_ENV_NO_CHDIR:
* if cd(pw->pw_dir): ok: else if SETUP_ENV_TO_TMP: cd(/tmp) else: cd(/) or die
* if SETUP_ENV_CLEARENV: cd(pw->pw_dir), clear environment, then set
* TERM=(old value)
* USER=pw->pw_name, LOGNAME=pw->pw_name
* PATH=bb_default_[root_]path
* HOME=pw->pw_dir
* SHELL=shell
* else if change_env = 1:
* if not root (if pw->pw_uid != 0):
* else if SETUP_ENV_CHANGEENV:
* if not root (if pw->pw_uid != 0) or if SETUP_ENV_CHANGEENV_LOGNAME:
* USER=pw->pw_name, LOGNAME=pw->pw_name
* HOME=pw->pw_dir
* SHELL=shell
@@ -1743,10 +1744,11 @@ extern void selinux_or_die(void) FAST_FUNC;
* NB: CHANGEENV and CLEARENV use setenv() - this leaks memory!
* If setup_environment() is used is vforked child, this leaks memory _in parent too_!
*/
#define SETUP_ENV_CHANGEENV (1 << 0)
#define SETUP_ENV_CLEARENV (1 << 1)
#define SETUP_ENV_TO_TMP (1 << 2)
#define SETUP_ENV_NO_CHDIR (1 << 4)
#define SETUP_ENV_CHANGEENV (1 << 0)
#define SETUP_ENV_CHANGEENV_LOGNAME (1 << 1)
#define SETUP_ENV_CLEARENV (1 << 2)
#define SETUP_ENV_TO_TMP (1 << 3)
#define SETUP_ENV_NO_CHDIR (1 << 4)
void setup_environment(const char *shell, int flags, const struct passwd *pw) FAST_FUNC;
void nuke_str(char *str) FAST_FUNC;
#if ENABLE_FEATURE_SECURETTY && !ENABLE_PAM