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Apply the correct fix for bin/50679: don't mess around with process groups

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or the tty, just block selected signals in the parent like system(3) does.
Many thanks to bde for his assistance in finding the correct solution.

PR:		bin/50679
This commit is contained in:
Dag-Erling Smørgrav 2003-04-09 16:39:47 +00:00
parent 7e9b53e399
commit e947f78c16
1 changed files with 19 additions and 13 deletions
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32
lib/libutil/pw_util.c
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@ -287,54 +287,60 @@ pw_mkdb(const char *user)
int
pw_edit(int notsetuid)
{
struct sigaction sa, sa_int, sa_quit;
sigset_t sigset, oldsigset;
struct stat st1, st2;
const char *editor;
char *editcmd;
int pstat;
if ((editor = getenv("EDITOR")) == NULL)
editor = _PATH_VI;
if (stat(tempname, &st1) == -1)
return (-1);
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGINT, &sa, &sa_int);
sigaction(SIGQUIT, &sa, &sa_quit);
sigemptyset(&sigset);
sigaddset(&sigset, SIGCHLD);
sigprocmask(SIG_BLOCK, &sigset, &oldsigset);
switch ((editpid = fork())) {
case -1:
return (-1);
case 0:
/* child */
sigaction(SIGINT, &sa_int, NULL);
sigaction(SIGQUIT, &sa_quit, NULL);
sigprocmask(SIG_SETMASK, &oldsigset, NULL);
if (notsetuid) {
(void)setgid(getgid());
(void)setuid(getuid());
}
if (asprintf(&editcmd, "exec %s %s", editor, tempname) == NULL)
_exit(EXIT_FAILURE);
errno = 0;
execl(_PATH_BSHELL, "sh", "-c", editcmd, NULL);
free(editcmd);
execlp(editor, editor, tempname, NULL);
_exit(errno);
default:
/* parent */
break;
}
setpgid(editpid, editpid);
tcsetpgrp(1, editpid);
for (;;) {
if (waitpid(editpid, &pstat, WUNTRACED) == -1) {
unlink(tempname);
return (-1);
break;
} else if (WIFSTOPPED(pstat)) {
raise(WSTOPSIG(pstat));
tcsetpgrp(1, getpgid(editpid));
kill(editpid, SIGCONT);
} else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) {
editpid = -1;
break;
} else {
unlink(tempname);
*tempname = '\0';
editpid = -1;
return (-1);
break;
}
}
sigaction(SIGINT, &sa_int, NULL);
sigaction(SIGQUIT, &sa_quit, NULL);
sigprocmask(SIG_SETMASK, &oldsigset, NULL);
if (stat(tempname, &st2) == -1)
return (-1);
return (st1.st_mtime != st2.st_mtime);