From 95534ef8f7558b5f7f93991043441adb9c7ddf33 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 15 Jan 2025 23:43:37 +0900
Subject: [PATCH] udev-rules: ignore whole command result if it is too long and
 does not contain newline

(cherry picked from commit 68b1e1b61ab333bb4dee4a43373bad54080e755f)

Resolves: RHEL-75774
---
 src/udev/udev-rules.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
index 53370f6085..9aa98a3b3c 100644
--- a/src/udev/udev-rules.c
+++ b/src/udev/udev-rules.c
@@ -2379,15 +2379,18 @@ static int udev_rule_apply_token_to_event(
                 }
 
                 if (truncated) {
-                        bool found = false;
+                        log_event_debug(event, token, "Result of \"%s\" is too long and truncated, ignoring the last line of the result.", buf);
 
                         /* Drop the last line. */
+                        bool found = false;
                         for (char *p = PTR_SUB1(buf + strlen(buf), buf); p; p = PTR_SUB1(p, buf))
                                 if (strchr(NEWLINE, *p)) {
                                         *p = '\0';
                                         found = true;
-                                } else if (found)
                                         break;
+                                }
+                        if (!found)
+                                buf[0] = '\0';
                 }
 
                 r = strv_split_newlines_full(&lines, result, EXTRACT_RETAIN_ESCAPE);