[LTP] [PATCH 06/13] Hugetlb: Migrating libhugetlbfs mremap-fixed-normal-near-huge

[Tarun Sahu <tsahu@linux.ibm.com>]

Migrating the libhugetlbfs/testcases/mremap-fixed-normal-near-huge.c test

Test Description: The kernel has bug for mremap() on some architecture.
mremap() can cause crashes on architectures with holes in the address
space (like ia64) and on powerpc with it's distinct page size "slices".

This test get the huge mapping address and mremap() normal mapping
near to this huge mapping.

Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
---
 runtest/hugetlb                               |   1 +
 testcases/kernel/mem/.gitignore               |   1 +
 .../kernel/mem/hugetlb/hugemmap/hugemmap26.c  | 131 ++++++++++++++++++
 3 files changed, 133 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap26.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 65265b0fe..55185f2f7 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -26,6 +26,7 @@ hugemmap21 hugemmap21
 hugemmap22 hugemmap22
 hugemmap23 hugemmap23
 hugemmap25 hugemmap25
+hugemmap26 hugemmap26
 hugemmap05_1 hugemmap05 -m
 hugemmap05_2 hugemmap05 -s
 hugemmap05_3 hugemmap05 -s -m
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index c865a1e55..4886c6a5f 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -25,6 +25,7 @@
 /hugetlb/hugemmap/hugemmap22
 /hugetlb/hugemmap/hugemmap23
 /hugetlb/hugemmap/hugemmap25
+/hugetlb/hugemmap/hugemmap26
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap26.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap26.c
new file mode 100644
index 000000000..03dd248bd
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap26.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2009 IBM Corporation.
+ * Author: David Gibson
+ */
+
+/*\
+ * [Description]
+ *
+ * Test Description: The kernel has bug for mremap() on some architecture.
+ * mremap() can cause crashes on architectures with holes in the address
+ * space (like ia64) and on powerpc with it's distinct page size "slices".
+ *
+ * This test get the huge mapping address and mremap() normal mapping
+ * near to this huge mapping.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/mount.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include "hugetlb.h"
+
+#define RANDOM_CONSTANT	0x1234ABCD
+#define MNTPOINT "hugetlbfs/"
+
+static int  fd = -1;
+static long hpage_size, page_size;
+
+static int do_readback(void *p, size_t size, const char *stage)
+{
+	unsigned int *q = p;
+	size_t i;
+
+	tst_res(TINFO, "%s(%p, 0x%lx, \"%s\")", __func__, p,
+	       (unsigned long)size, stage);
+
+	for (i = 0; i < (size / sizeof(*q)); i++)
+		q[i] = RANDOM_CONSTANT ^ i;
+
+	for (i = 0; i < (size / sizeof(*q)); i++) {
+		if (q[i] != (RANDOM_CONSTANT ^ i)) {
+			tst_res(TFAIL, "Stage \"%s\": Mismatch at offset 0x%lx: 0x%x "
+					"instead of 0x%lx", stage, i, q[i], RANDOM_CONSTANT ^ i);
+			return -1;
+		}
+	}
+	return 0;
+}
+
+static int do_remap(void *target)
+{
+	void *a, *b;
+	int ret;
+
+	a = SAFE_MMAP(NULL, page_size, PROT_READ|PROT_WRITE,
+		  MAP_SHARED|MAP_ANONYMOUS, -1, 0);
+
+	ret = do_readback(a, page_size, "base normal");
+	if (ret)
+		goto cleanup;
+	b = mremap(a, page_size, page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+		   target);
+
+	if (b != MAP_FAILED) {
+		do_readback(b, page_size, "remapped");
+		a = b;
+	} else
+		tst_res(TINFO|TERRNO, "mremap(MAYMOVE|FIXED) disallowed");
+
+cleanup:
+	SAFE_MUNMAP(a, page_size);
+	return ret;
+}
+
+static void run_test(void)
+{
+	void *p;
+	int ret;
+
+	fd = tst_creat_unlinked(MNTPOINT, 0);
+	p = SAFE_MMAP(NULL, 3*hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+		 fd, 0);
+
+	SAFE_MUNMAP(p, hpage_size);
+
+	SAFE_MUNMAP(p + 2*hpage_size, hpage_size);
+
+	p = p + hpage_size;
+
+	tst_res(TINFO, "Hugepage mapping at %p", p);
+
+	ret = do_readback(p, hpage_size, "base hugepage");
+	if (ret)
+		goto cleanup;
+	ret = do_remap(p - page_size);
+	if (ret)
+		goto cleanup;
+	ret = do_remap(p + hpage_size);
+	if (ret == 0)
+		tst_res(TPASS, "Successfully tested mremap normal near hpage mapping");
+cleanup:
+	SAFE_MUNMAP(p, hpage_size);
+	SAFE_CLOSE(fd);
+}
+
+static void setup(void)
+{
+	hpage_size = SAFE_READ_MEMINFO(MEMINFO_HPAGE_SIZE)*1024;
+	page_size = getpagesize();
+}
+
+static void cleanup(void)
+{
+	if (fd >= 0)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.needs_tmpdir = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {3, TST_NEEDS},
+};
-- 
2.31.1


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