From 7618f255df3b2d1a045d2fe7fd2dcbee420dfe66 Mon Sep 17 00:00:00 2001
From: Michael Banck <michael.banck@credativ.de>
Date: Tue, 28 Aug 2018 17:27:20 +0200
Subject: [PATCH] Check block size from PGDATA against compiled in BLCKSZ and
 abort on mismatch.

---
 pg_checksums.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/pg_checksums.c b/pg_checksums.c
index 9543b43..138db86 100644
--- a/pg_checksums.c
+++ b/pg_checksums.c
@@ -797,6 +797,17 @@ main(int argc, char *argv[])
 		exit(1);
 	}
 
+	/*
+	 * Check that the PGDATA blocksize is the same as the one pg_checksums
+	 * was compiled against (BLCKSZ).
+	 */
+	if (ControlFile->blcksz != BLCKSZ)
+	{
+		fprintf(stderr, _("%s: data directory block size %d is different to compiled-in block size %d.\n"),
+				progname, ControlFile->blcksz, BLCKSZ);
+		exit(1);
+	}
+
 	if (activate || verify)
 	{
 #if PG_VERSION_NUM < 100000