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Don't try to suspend sudo if the user's tty has gone away.

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Fixes a problem on Solaris 11.4 (and possibly others) where sudo
continually tries to put itself in the background after the user's
terminal has been revoked.
This commit is contained in:
Todd C. Miller
2020-06-01 14:19:50 -06:00
parent de31e6d53b
commit 592eb7ab49
1 changed files with 25 additions and 12 deletions
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33
src/exec_pty.c
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@@ -110,7 +110,7 @@ static void del_io_events(bool nonblocking);
static void sync_ttysize(struct exec_closure_pty *ec);
static int safe_close(int fd);
static void ev_free_by_fd(struct sudo_event_base *evbase, int fd);
static void check_foreground(struct exec_closure_pty *ec);
static pid_t check_foreground(struct exec_closure_pty *ec);
static void add_io_events(struct sudo_event_base *evbase);
static void schedule_signal(struct exec_closure_pty *ec, int signo);
@@ -487,22 +487,25 @@ log_winchange(unsigned int rows, unsigned int cols)
/*
* Check whether we are running in the foregroup.
* Updates the foreground global and does lazy init of the
* the pty slave as needed.
* Updates the foreground global and updates the window size.
* Returns 0 if there is no tty, the foreground process group ID
* on success, or -1 on failure (tty revoked).
*/
static void
static pid_t
check_foreground(struct exec_closure_pty *ec)
{
int ret = 0;
debug_decl(check_foreground, SUDO_DEBUG_EXEC);
if (io_fds[SFD_USERTTY] != -1) {
foreground = tcgetpgrp(io_fds[SFD_USERTTY]) == ec->ppgrp;
if ((ret = tcgetpgrp(io_fds[SFD_USERTTY])) != -1) {
foreground = ret == ec->ppgrp;
/* Also check for window size changes. */
sync_ttysize(ec);
}
debug_return;
}
debug_return_int(ret);
}
/*
@@ -525,8 +528,12 @@ suspend_sudo(struct exec_closure_pty *ec, int signo)
* If sudo is already the foreground process, just resume the command
* in the foreground. If not, we'll suspend sudo and resume later.
*/
if (!foreground)
check_foreground(ec);
if (!foreground) {
if (check_foreground(ec) == -1) {
/* User's tty was revoked. */
break;
}
}
if (foreground) {
if (ttymode != TERM_RAW) {
if (sudo_term_raw(io_fds[SFD_USERTTY], 0))
@@ -568,7 +575,10 @@ suspend_sudo(struct exec_closure_pty *ec, int signo)
log_suspend(SIGCONT);
/* Check foreground/background status on resume. */
check_foreground(ec);
if (check_foreground(ec) == -1) {
/* User's tty was revoked. */
break;
}
/*
* We always resume the command in the foreground if sudo itself
@@ -903,6 +913,9 @@ schedule_signal(struct exec_closure_pty *ec, int signo)
char signame[SIG2STR_MAX];
debug_decl(schedule_signal, SUDO_DEBUG_EXEC);
if (signo == 0)
debug_return;
if (signo == SIGCONT_FG)
strlcpy(signame, "CONT_FG", sizeof(signame));
else if (signo == SIGCONT_BG)