[LTP] [PATCH 22/29] 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  | 148 ++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap26.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 3ae1065c7..2c65c1439 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -26,6 +26,7 @@ hugemmap21 hugemmap21 -T 2 -s 5
 hugemmap22 hugemmap22 -T 2 -s 5
 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..0a6981470
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap26.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2009 David Gibson, IBM Corporation.
+ *
+ * Test Name: mremap fixed normal near huge
+ *
+ * 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.
+ *
+ * HISTORY
+ *  Written by David Gibson
+ *
+ */
+
+#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
+
+static char *verbose;
+static int  fd = -1;
+static char hfile[MAXPATHLEN];
+static long hpage_size, page_size;
+
+static void do_readback(void *p, size_t size, const char *stage)
+{
+	unsigned int *q = p;
+	size_t i;
+
+	if (verbose)
+		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);
+			tst_brk(TBROK, "Once failed, No point in continue further");
+		}
+	}
+}
+
+static void do_remap(void *target)
+{
+	void *a, *b;
+
+	a = SAFE_MMAP(NULL, page_size, PROT_READ|PROT_WRITE,
+		  MAP_SHARED|MAP_ANONYMOUS, -1, 0);
+
+	if (verbose)
+		tst_res(TINFO, "Normal base mapping at %p\n", a);
+
+	do_readback(a, page_size, "base normal");
+
+	if (verbose)
+		tst_res(TINFO, "Attempting mremap(MAYMOVE|FIXED) to %p...", target);
+
+	b = mremap(a, page_size, page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+		   target);
+
+	if (b != MAP_FAILED) {
+		do_readback(b, page_size, "remapped");
+	} else {
+		if (verbose)
+			tst_res(TINFO|TERRNO, "disallowed");
+		b = a;
+	}
+
+	SAFE_MUNMAP(b, page_size);
+}
+
+static void run_test(void)
+{
+	void *p;
+
+	fd = SAFE_OPEN(hfile, O_RDWR | O_CREAT, 0600);
+	SAFE_UNLINK(hfile);
+	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;
+
+	if (verbose)
+		tst_res(TINFO, "Hugepage mapping at %p\n", p);
+
+	do_readback(p, hpage_size, "base hugepage");
+
+	do_remap(p - page_size);
+	do_remap(p + hpage_size);
+
+	tst_res(TPASS, "Successful");
+	SAFE_MUNMAP(p, hpage_size);
+	SAFE_CLOSE(fd);
+}
+
+static void setup(void)
+{
+	if (tst_hugepages < 3)
+		tst_brk(TCONF, "Not enough hugepages for testing.");
+
+	if (!Hopt)
+		Hopt = tst_get_tmpdir();
+	SAFE_MOUNT("none", Hopt, "hugetlbfs", 0, NULL);
+
+	snprintf(hfile, sizeof(hfile), "%s/ltp_hugetlbfile%d", Hopt, getpid());
+
+	hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024;
+	page_size = getpagesize();
+}
+
+static void cleanup(void)
+{
+	if (fd >= 0)
+		SAFE_CLOSE(fd);
+	umount2(Hopt, MNT_DETACH);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.options = (struct tst_option[]) {
+		{"v", &verbose, "Turns on verbose mode"},
+		{"H:", &Hopt,   "Location of hugetlbfs, i.e.  -H /var/hugetlbfs"},
+		{"s:", &nr_opt, "Set the number of the been allocated hugepages"},
+		{}
+	},
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {3, TST_REQUEST},
+};
-- 
2.31.1


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