diff options
| -rw-r--r-- | loginutils/sulogin.c | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c index d2ac1f6..33f078a 100644 --- a/loginutils/sulogin.c +++ b/loginutils/sulogin.c @@ -32,6 +32,14 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv) struct passwd *pwd; const char *shell; + /* Note: sulogin is not a suid app. It is meant to be run by init + * for single user / emergency mode. init starts it as root. + * Normal users (potentially malisious ones) can only run it under + * their UID, therefore no paranoia here is warranted: + * $LD_LIBRARY_PATH in env, TTY = /dev/sda + * are no more dangerous here than in e.g. cp applet. + */ + logmode = LOGMODE_BOTH; openlog(applet_name, 0, LOG_AUTH); @@ -47,18 +55,9 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv) dup(0); } - /* Malicious use like "sulogin /dev/sda"? */ - if (!isatty(0) || !isatty(1) || !isatty(2)) { - logmode = LOGMODE_SYSLOG; - bb_error_msg_and_die("not a tty"); - } - - /* Clear dangerous stuff, set PATH */ - sanitize_env_if_suid(); - pwd = getpwuid(0); if (!pwd) { - goto auth_error; + bb_error_msg_and_die("no password entry for root"); } while (1) { @@ -92,7 +91,4 @@ int sulogin_main(int argc UNUSED_PARAM, char **argv) /* Exec login shell with no additional parameters. Never returns. */ run_shell(shell, 1, NULL, NULL); - - auth_error: - bb_error_msg_and_die("no password entry for root"); } |