linux-kernel - [PATCH 2/2] selftest/vm: test that mremap fails on non-existent vma

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Date:   Thu, 28 Apr 2022 00:44:39 +0200
From:   Niels Dossche <dossche.niels@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mina Almasry <almasrymina@...gle.com>,
        Niels Dossche <dossche.niels@...il.com>
Subject: [PATCH 2/2] selftest/vm: test that mremap fails on non-existent vma

Add a regression test that validates that mremap fails for vma's that
don't exist.

Signed-off-by: Niels Dossche <dossche.niels@...il.com>
---
 tools/testing/selftests/vm/hugepage-mremap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/vm/hugepage-mremap.c b/tools/testing/selftests/vm/hugepage-mremap.c
index 1d689084a54b..585978f181ed 100644
--- a/tools/testing/selftests/vm/hugepage-mremap.c
+++ b/tools/testing/selftests/vm/hugepage-mremap.c
@@ -178,6 +178,12 @@ int main(int argc, char *argv[])
 
 	munmap(addr, length);
 
+	addr = mremap(addr, length, length, 0);
+	if (addr != MAP_FAILED) {
+		printf("mremap: Expected failure, but call succeeded\n");
+		exit(1);
+	}
+
 	close(fd);
 	unlink(argv[argc-1]);
 
-- 
2.35.2