36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
From 727056e0c9519d8eecde801e950b35f2f69c72e2 Mon Sep 17 00:00:00 2001
|
|
From: "Todd C. Miller" <Todd.Miller@sudo.ws>
|
|
Date: Fri, 23 Apr 2021 07:41:27 -0600
|
|
Subject: [PATCH] Make sure SIGCHLD is not ignored when sudo is executed. If
|
|
SIGCHLD is ignored there is a race condition between when the process is
|
|
executed and when the SIGCHLD handler is installed. This fixes the bug
|
|
described by GitHub PR #98
|
|
|
|
---
|
|
src/signal.c | 12 ++++++++++++
|
|
1 file changed, 12 insertions(+)
|
|
|
|
diff --git a/src/signal.c b/src/signal.c
|
|
index 7f90d707b..866b64790 100644
|
|
--- a/src/signal.c
|
|
+++ b/src/signal.c
|
|
@@ -133,6 +133,18 @@ init_signals(void)
|
|
case SIGTTOU:
|
|
/* Don't install these until exec time. */
|
|
break;
|
|
+ case SIGCHLD:
|
|
+ /* Sudo needs to be able to catch SIGCHLD. */
|
|
+ if (ss->sa.sa_handler == SIG_IGN) {
|
|
+ sudo_debug_printf(SUDO_DEBUG_INFO,
|
|
+ "will restore signal %d on exec", SIGCHLD);
|
|
+ ss->restore = true;
|
|
+ }
|
|
+ if (sigaction(SIGCHLD, &sa, NULL) != 0) {
|
|
+ sudo_warn(U_("unable to set handler for signal %d"),
|
|
+ SIGCHLD);
|
|
+ }
|
|
+ break;
|
|
default:
|
|
if (ss->sa.sa_handler != SIG_IGN) {
|
|
if (sigaction(ss->signo, &sa, NULL) != 0) {
|