108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* Copyright (C) 2005-2006 IBM Corporation.
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* Author: David Gibson & Adam Litke
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*/
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/*\
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* [Description]
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*
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* The test do mmap() with shared mapping and write. It matches the data
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* with private mmap() and then change it with other data. It checks
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* shared mapping data if data is not contaiminated by private mapping.
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* Similiarly checks for private data if it is not contaminated by changing
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* shared mmap data.
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*/
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#include "hugetlb.h"
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#define C1 0x1234ABCD
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#define C2 0xFEDC9876
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#define MNTPOINT "hugetlbfs/"
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static unsigned long hpage_size;
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static int fd = -1;
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static void run_test(void)
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{
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void *p, *q;
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unsigned int *pl, *ql;
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unsigned long i;
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fd = tst_creat_unlinked(MNTPOINT, 0);
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p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
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fd, 0);
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pl = p;
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for (i = 0; i < (hpage_size / sizeof(*pl)); i++)
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pl[i] = C1 ^ i;
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q = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
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fd, 0);
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ql = q;
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for (i = 0; i < (hpage_size / sizeof(*ql)); i++) {
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if (ql[i] != (C1 ^ i)) {
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tst_res(TFAIL, "Mismatch at offset %lu, got: %u, expected: %lu",
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i, ql[i], C1 ^ i);
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goto cleanup;
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}
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}
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for (i = 0; i < (hpage_size / sizeof(*ql)); i++)
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ql[i] = C2 ^ i;
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for (i = 0; i < (hpage_size / sizeof(*ql)); i++) {
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if (ql[i] != (C2 ^ i)) {
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tst_res(TFAIL, "PRIVATE mismatch at offset %lu, got: %u, expected: %lu",
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i, ql[i], C2 ^ i);
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goto cleanup;
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}
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}
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for (i = 0; i < (hpage_size / sizeof(*pl)); i++) {
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if (pl[i] != (C1 ^ i)) {
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tst_res(TFAIL, "SHARED map contaminated at offset %lu, "
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"got: %u, expected: %lu", i, pl[i], C1 ^ i);
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goto cleanup;
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}
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}
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memset(p, 0, hpage_size);
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for (i = 0; i < (hpage_size / sizeof(*ql)); i++) {
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if (ql[i] != (C2 ^ i)) {
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tst_res(TFAIL, "PRIVATE map contaminated at offset %lu, "
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"got: %u, expected: %lu", i, ql[i], C2 ^ i);
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goto cleanup;
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}
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}
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tst_res(TPASS, "Successfully tested shared/private mmaping and its data");
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cleanup:
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SAFE_MUNMAP(p, hpage_size);
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SAFE_MUNMAP(q, hpage_size);
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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 = {2, TST_NEEDS},
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};
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