From: Niels Dossche <dossche.niels@gmail.com>
Date: Tue, 10 May 2022 01:20:54 +0000 (-0700)
Subject: selftest/vm: test that mremap fails on non-existent vma
X-Git-Tag: v5.19-rc1~138^2~184
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9994715333515e82865e533250e488496b9742f4;p=thirdparty%2Fkernel%2Flinux.git

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.

Link: https://lkml.kernel.org/r/20220427224439.23828-3-dossche.niels@gmail.com
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/tools/testing/selftests/vm/hugepage-mremap.c b/tools/testing/selftests/vm/hugepage-mremap.c
index 1d689084a54ba..585978f181ed1 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]);