125 lines
2.3 KiB
C
125 lines
2.3 KiB
C
// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* Copyright (C) 2009 IBM Corporation.
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* Author: David Gibson
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*/
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/*\
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* [Description]
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*
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* The kernel has bug for mremap() on some architecture. mremap() can
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* cause crashes on architectures with holes in the address space
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* (like ia64) and on powerpc with it's distinct page size "slices".
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*
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* This test get the normal mapping address and mremap() hugepage mapping
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* near to this normal mapping.
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*/
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#define _GNU_SOURCE
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#include "hugetlb.h"
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#define MNTPOINT "hugetlbfs/"
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static int fd = -1;
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static long hpage_size;
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static int do_remap(int fd, void *target)
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{
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void *a, *b;
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int ret;
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a = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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ret = do_readback(a, hpage_size, "base huge");
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if (ret)
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goto cleanup;
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b = mremap(a, hpage_size, hpage_size, MREMAP_MAYMOVE | MREMAP_FIXED,
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target);
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if (b != MAP_FAILED) {
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ret = do_readback(b, hpage_size, "remapped");
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a = b;
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} else {
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tst_res(TINFO|TERRNO, "mremap(MAYMOVE|FIXED) disallowed");
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}
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cleanup:
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SAFE_MUNMAP(a, hpage_size);
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return ret;
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}
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static void *map_align(size_t size, size_t align)
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{
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unsigned long xsize = size + align - getpagesize();
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size_t t;
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void *p, *q;
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p = SAFE_MMAP(NULL, xsize, PROT_READ|PROT_WRITE,
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MAP_SHARED | MAP_ANONYMOUS, -1, 0);
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q = PALIGN(p, align);
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t = q - p;
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if (t)
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SAFE_MUNMAP(p, t);
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t = p + xsize - (q + size);
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if (t)
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SAFE_MUNMAP(q + size, t);
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return q;
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}
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static void run_test(void)
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{
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void *p;
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int ret;
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fd = tst_creat_unlinked(MNTPOINT, 0);
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p = map_align(3*hpage_size, hpage_size);
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SAFE_MUNMAP(p, hpage_size);
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SAFE_MUNMAP(p + 2*hpage_size, hpage_size);
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p = p + hpage_size;
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tst_res(TINFO, "Normal mapping at %p", p);
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ret = do_readback(p, hpage_size, "base normal page");
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if (ret)
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goto cleanup;
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ret = do_remap(fd, p - hpage_size);
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if (ret)
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goto cleanup;
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ret = do_remap(fd, p + hpage_size);
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if (ret == 0)
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tst_res(TPASS, "Successfully tested mremap hpage near normal mapping");
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cleanup:
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SAFE_CLOSE(fd);
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}
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static void setup(void)
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{
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hpage_size = tst_get_hugepage_size();
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}
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static void cleanup(void)
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{
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if (fd >= 0)
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SAFE_CLOSE(fd);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.mntpoint = MNTPOINT,
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.needs_hugetlbfs = 1,
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = run_test,
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.hugepages = {3, TST_NEEDS},
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};
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