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