@@ -30,6 +30,7 @@ hugemmap26 hugemmap26
hugemmap27 hugemmap27
hugemmap28 hugemmap28
hugemmap29 hugemmap29
+hugemmap30 hugemmap30
hugemmap05_1 hugemmap05 -m
hugemmap05_2 hugemmap05 -s
hugemmap05_3 hugemmap05 -s -m
@@ -29,6 +29,7 @@
/hugetlb/hugemmap/hugemmap27
/hugetlb/hugemmap/hugemmap28
/hugetlb/hugemmap/hugemmap29
+/hugetlb/hugemmap/hugemmap30
/hugetlb/hugeshmat/hugeshmat01
/hugetlb/hugeshmat/hugeshmat02
/hugetlb/hugeshmat/hugeshmat03
new file mode 100644
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2005-2006 IBM Corporation.
+ * Author: Mel Gorman
+ */
+
+/*\
+ * [Description]
+ *
+ * readahead() on some kernels can cause the reservation counter to get
+ * corrupted. The problem is that the pages are allocated for the
+ * reservation but not faulted in at the time of allocation. The
+ * counters do not get updated and effectively "leak". This test
+ * identifies whether the kernel is vulnerable to the problem or not.
+ * It's fixed in kernel by commit f2deae9d4e70.
+ */
+
+#define _GNU_SOURCE
+#include "hugetlb.h"
+
+#define MNTPOINT "hugetlbfs/"
+static long hpage_size;
+static int fd = -1;
+
+static void run_test(void)
+{
+ void *p;
+ unsigned long initial_rsvd, map_rsvd, readahead_rsvd, end_rsvd;
+
+ fd = tst_creat_unlinked(MNTPOINT, 0);
+ initial_rsvd = SAFE_READ_MEMINFO(MEMINFO_HPAGE_RSVD);
+
+ p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+ fd, 0);
+ map_rsvd = SAFE_READ_MEMINFO(MEMINFO_HPAGE_RSVD);
+ tst_res(TINFO, "map_rsvd: %lu", map_rsvd);
+
+ readahead(fd, 0, hpage_size);
+ readahead_rsvd = SAFE_READ_MEMINFO(MEMINFO_HPAGE_RSVD);
+ tst_res(TINFO, "readahead_rsvd: %lu", readahead_rsvd);
+
+ memset(p, 1, hpage_size);
+
+ SAFE_MUNMAP(p, hpage_size);
+ SAFE_CLOSE(fd);
+ end_rsvd = SAFE_READ_MEMINFO(MEMINFO_HPAGE_RSVD);
+
+ TST_EXP_EQ_LU(end_rsvd, initial_rsvd);
+}
+
+static void setup(void)
+{
+ hpage_size = tst_get_hugepage_size();
+}
+
+static void cleanup(void)
+{
+ if (fd >= 0)
+ SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+ .tags = (struct tst_tag[]) {
+ {"linux-git", "f2deae9d4e70"},
+ {}
+ },
+ .needs_root = 1,
+ .mntpoint = MNTPOINT,
+ .needs_hugetlbfs = 1,
+ .needs_tmpdir = 1,
+ .setup = setup,
+ .cleanup = cleanup,
+ .test_all = run_test,
+ .hugepages = {1, TST_NEEDS},
+};