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Block signals between forking and clearing signal handlers (or calling

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event_reinit) - if the child gets a signal and fires the libevent signal
handler during this period it could write a signal into the parent's
signal pipe. GitHub issue 1001 from Aaron van Geffen.
This commit is contained in:
nicm
2017-07-12 10:04:51 +00:00
parent 0453ad0146
commit 51112221ee
4 changed files with 33 additions and 9 deletions
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18
window.c
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@ -22,6 +22,7 @@
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <signal.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
@ -886,6 +887,7 @@ window_pane_spawn(struct window_pane *wp, int argc, char **argv,
const char *ptr, *first, *home;
struct termios tio2;
int i;
sigset_t set, oldset;
if (wp->fd != -1) {
bufferevent_free(wp->event);
@ -915,14 +917,21 @@ window_pane_spawn(struct window_pane *wp, int argc, char **argv,
ws.ws_col = screen_size_x(&wp->base);
ws.ws_row = screen_size_y(&wp->base);
wp->pid = fdforkpty(ptm_fd, &wp->fd, wp->tty, NULL, &ws);
switch (wp->pid) {
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, &oldset);
switch (wp->pid = fdforkpty(ptm_fd, &wp->fd, wp->tty, NULL, &ws)) {
case -1:
wp->fd = -1;
xasprintf(cause, "%s: %s", cmd, strerror(errno));
free(cmd);
sigprocmask(SIG_SETMASK, &oldset, NULL);
return (-1);
case 0:
proc_clear_signals(server_proc);
sigprocmask(SIG_SETMASK, &oldset, NULL);
if (chdir(wp->cwd) != 0) {
if ((home = find_home()) == NULL || chdir(home) != 0)
chdir("/");
@ -936,6 +945,7 @@ window_pane_spawn(struct window_pane *wp, int argc, char **argv,
if (tcsetattr(STDIN_FILENO, TCSANOW, &tio2) != 0)
fatal("tcgetattr failed");
log_close();
closefrom(STDERR_FILENO + 1);
if (path != NULL)
@ -943,9 +953,6 @@ window_pane_spawn(struct window_pane *wp, int argc, char **argv,
environ_set(env, "TMUX_PANE", "%%%u", wp->id);
environ_push(env);
proc_clear_signals(server_proc);
log_close();
setenv("SHELL", wp->shell, 1);
ptr = strrchr(wp->shell, '/');
@ -978,6 +985,7 @@ window_pane_spawn(struct window_pane *wp, int argc, char **argv,
fatal("execl failed");
}
sigprocmask(SIG_SETMASK, &oldset, NULL);
setblocking(wp->fd, 0);
wp->event = bufferevent_new(wp->fd, window_pane_read_callback, NULL,