File sudo-observe-SIGCHLD.patch of Package sudo.27425

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

Edited by jsikes@suse.com for sudo-1.8.10p3
---
 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
@@ -132,13 +132,17 @@ init_signals(void)
 
     for (ss = saved_signals; ss->signo > 0; ss++) {
 	switch (ss->signo) {
-	    case SIGCHLD:
 	    case SIGCONT:
 	    case SIGPIPE:
 	    case SIGTTIN:
 	    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)
+		    sigaction(SIGCHLD, &sa, NULL);
+		break;
 	    default:
 		if (ss->sa.sa_handler != SIG_IGN)
 		    sigaction(ss->signo, &sa, NULL);