From 1c80b19fe5f631b8d6106630803d586c8a1616a7 Mon Sep 17 00:00:00 2001
From: Dag Lem <dag@nimrod.no>
Date: Mon, 22 Aug 2022 11:21:14 +0200
Subject: [PATCH] Handle short reads from timestamp file

---
 src/libfaketime.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/libfaketime.c b/src/libfaketime.c
index 28b90f5..b5b0fe2 100644
--- a/src/libfaketime.c
+++ b/src/libfaketime.c
@@ -3142,9 +3142,13 @@ int read_config_file()
       (faketimerc = open(filename, O_RDONLY)) != -1 ||
       (faketimerc = open("/etc/faketimerc", O_RDONLY)) != -1)
   {
-    ssize_t length = read(faketimerc, user_faked_time, sizeof(user_faked_time) - 1);
+    ssize_t bytes;
+    ssize_t length = 0;
+    while ((bytes = read(faketimerc, user_faked_time + length, sizeof(user_faked_time) - 1 - length)) > 0) {
+      length += bytes;
+    }
     close(faketimerc);
-    if (length < 0) {
+    if (bytes < 0) {
       length = 0;
     }
     user_faked_time[length] = 0;