127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* Copyright (C) 2005-2006 David Gibson & Adam Litke, 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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* On some old ppc64 kernel, when hpage is mmaped on 32 bit boundary and
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* normal page below it, it triggers the bug caused by off-by-one error.
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*
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* WARNING: The offsets and addresses used within are specifically
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* calculated to trigger the bug as it existed. Don't mess with them
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* unless you *really* know what you're doing.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <sys/mount.h>
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#include <limits.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include "hugetlb.h"
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#define FOURGB (1ULL << 32)
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#define MNTPOINT "hugetlbfs/"
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static int fd = -1;
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static unsigned long hpage_size;
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static int page_size;
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static void run_test(void)
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{
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void *p, *q = NULL;
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unsigned long long lowaddr;
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unsigned long long below_start;
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unsigned long long above_end;
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p = mmap((void *)FOURGB, hpage_size, PROT_READ|PROT_WRITE,
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MAP_SHARED | MAP_FIXED, fd, 0);
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if (p == MAP_FAILED) {
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/* slice 0 (high) spans from 4G-1T */
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below_start = FOURGB;
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above_end = 1024ULL*1024*1024*1024;
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if (range_is_mapped(below_start, above_end) == 1) {
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tst_res(TINFO|TERRNO, "region 4G-IT is not free & "
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"mmap() failed expected");
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tst_res(TPASS, "Successful but inconclusive");
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} else
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tst_res(TFAIL|TERRNO, "mmap() huge failed unexpected");
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goto cleanup;
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}
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if (p != (void *)FOURGB) {
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tst_res(TFAIL, "Wrong address with MAP_FIXED huge");
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goto cleanup;
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}
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tst_res(TINFO, "Mapped hugetlb at %p", p);
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memset(p, 0, hpage_size);
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/* Test just below 4GB to check for off-by-one errors */
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lowaddr = FOURGB - page_size;
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q = mmap((void *)lowaddr, page_size, PROT_READ|PROT_WRITE,
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MAP_SHARED|MAP_FIXED|MAP_ANONYMOUS, 0, 0);
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if (q == MAP_FAILED) {
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below_start = FOURGB - page_size;
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above_end = FOURGB;
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if (range_is_mapped(below_start, above_end) == 1) {
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tst_res(TINFO|TERRNO, "region (4G-page)-4G is not free & "
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"mmap() failed expected");
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tst_res(TPASS, "Successful but inconclusive");
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} else
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tst_res(TFAIL|TERRNO, "mmap() normal failed unexpected");
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goto cleanup;
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}
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if (q != (void *)lowaddr) {
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tst_res(TFAIL, "Wrong address with MAP_FIXED normal");
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goto cleanup;
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}
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memset(q, 0, page_size);
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tst_res(TPASS, "Successful");
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cleanup:
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if (p && p != MAP_FAILED)
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SAFE_MUNMAP(p, hpage_size);
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if (q && q != MAP_FAILED)
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SAFE_MUNMAP(q, page_size);
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}
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static void setup(void)
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{
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page_size = getpagesize();
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hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024;
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if (sizeof(void *) <= 4)
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tst_brk(TCONF, "Machine must be >32 bit");
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if (hpage_size > FOURGB)
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tst_brk(TCONF, "Huge page size is too large");
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fd = tst_creat_unlinked(MNTPOINT, 0);
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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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.tags = (struct tst_tag[]) {
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{"linux-git", "9a94c5793a7b"},
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{}
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},
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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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