isa/sudo
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Prevent sudo from receiving SIGTTOU when it tries to restore the

Browse Source 
controlling terminal.  There appears to be a race with the shell
(bash) which we may lose.
This commit is contained in:
Todd C. Miller
2017-03-06 13:05:17 -07:00
parent 00b4732c9d
commit 2f074d33ab
1 changed files with 13 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/exec_nopty.c
View File

@@ -391,11 +391,21 @@ dispatch_signal(struct exec_closure_nopty *ec, int signo, char *signame)
}
if (saved_pgrp != -1) {
/*
* Restore command's process group if different.
* Otherwise, we cannot resume some shells.
* Restore foreground process group, if different.
* Otherwise, we cannot resume some shells (pdksh).
*
* There appears to be a race with shells that do restore
* the controlling group. Sudo can receive SIGTTOU
* if the shell has already changed the controlling tty.
*/
if (saved_pgrp != ppgrp)
if (saved_pgrp != ppgrp) {
sigset_t set, oset;
sigemptyset(&set);
sigaddset(&set, SIGTTOU);
sigprocmask(SIG_BLOCK, &set, &oset);
(void)tcsetpgrp(fd, saved_pgrp);
sigprocmask(SIG_SETMASK, &oset, NULL);
}
close(fd);
}
} else {