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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Copyright (C) 2009 IBM Corporation.
* Author: David Gibson
*/
/*\
* [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 normal mapping address and mremap() hugepage mapping
* near to this normal mapping.
*/
#define _GNU_SOURCE
#include "hugetlb.h"
#define MNTPOINT "hugetlbfs/"
static int fd = -1;
static long hpage_size;
static int do_remap(int fd, void *target)
{
void *a, *b;
int ret;
a = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
ret = do_readback(a, hpage_size, "base huge");
if (ret)
goto cleanup;
b = mremap(a, hpage_size, hpage_size, MREMAP_MAYMOVE | MREMAP_FIXED,
target);
if (b != MAP_FAILED) {
ret = do_readback(b, hpage_size, "remapped");
a = b;
} else {
tst_res(TINFO|TERRNO, "mremap(MAYMOVE|FIXED) disallowed");
}
cleanup:
SAFE_MUNMAP(a, hpage_size);
return ret;
}
static void *map_align(size_t size, size_t align)
{
unsigned long xsize = size + align - getpagesize();
size_t t;
void *p, *q;
p = SAFE_MMAP(NULL, xsize, PROT_READ|PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
q = PALIGN(p, align);
t = q - p;
if (t)
SAFE_MUNMAP(p, t);
t = p + xsize - (q + size);
if (t)
SAFE_MUNMAP(q + size, t);
return q;
}
static void run_test(void)
{
void *p;
int ret;
fd = tst_creat_unlinked(MNTPOINT, 0);
p = map_align(3*hpage_size, hpage_size);
SAFE_MUNMAP(p, hpage_size);
SAFE_MUNMAP(p + 2*hpage_size, hpage_size);
p = p + hpage_size;
tst_res(TINFO, "Normal mapping at %p", p);
ret = do_readback(p, hpage_size, "base normal page");
if (ret)
goto cleanup;
ret = do_remap(fd, p - hpage_size);
if (ret)
goto cleanup;
ret = do_remap(fd, p + hpage_size);
if (ret == 0)
tst_res(TPASS, "Successfully tested mremap hpage near normal mapping");
cleanup:
SAFE_CLOSE(fd);
}
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 = {
.needs_root = 1,
.mntpoint = MNTPOINT,
.needs_hugetlbfs = 1,
.needs_tmpdir = 1,
.setup = setup,
.cleanup = cleanup,
.test_all = run_test,
.hugepages = {3, TST_NEEDS},
};
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