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/*
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* libhugetlbfs - Easy use of Linux hugepages
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* Copyright (C) 2005-2007 David Gibson & Adam Litke, IBM Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/utsname.h>
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#include <hugetlbfs.h>
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#include "hugetests.h"
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/*
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* Test rationale:
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*
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* Just as normal mmap()s can't have an address, length or offset
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* which is not page aligned, so hugepage mmap()s can't have an
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* address, length or offset with is not hugepage aligned.
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*
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* However, from time to time when the various mmap() /
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* get_unmapped_area() paths are updated, somebody misses one of the
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* necessary checks for the hugepage paths. This testcase ensures
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* that attempted hugepage mappings with parameters which are not
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* correctly hugepage aligned are rejected.
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*
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* However starting with 3.10-rc1, length passed in mmap() doesn't need
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* to be aligned because commit af73e4d9506d3b797509f3c030e7dcd554f7d9c4
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* added ALIGN() to kernel side, in mmap_pgoff(), when mapping huge page
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* files.
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*/
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int main(int argc, char *argv[])
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{
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long page_size, hpage_size;
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int fd;
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void *p, *q;
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int err;
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struct utsname buf;
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test_init(argc, argv);
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if (uname(&buf) != 0)
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FAIL("uname failed %s", strerror(errno));
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page_size = getpagesize();
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hpage_size = check_hugepagesize();
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fd = hugetlbfs_unlinked_fd();
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if (fd < 0)
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FAIL("hugetlbfs_unlinked_fd()");
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/* First see what an ok mapping looks like, as a basis for our
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* bad addresses and so forth */
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p = mmap(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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if (p == MAP_FAILED)
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FAIL("mmap() without hint failed: %s", strerror(errno));
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if (((unsigned long)p % hpage_size) != 0)
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FAIL("mmap() without hint at misaligned address");
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verbose_printf("Mapped at %p, length 0x%lx\n", p, hpage_size);
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err = munmap(p, hpage_size);
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if (err != 0)
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FAIL("munmap() without hint failed: %s", strerror(errno));
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/* 1) Try a misaligned hint address */
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q = mmap(p + page_size, hpage_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE, fd, 0);
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if (q == MAP_FAILED)
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/* Bad hint shouldn't fail, just ignore the hint */
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FAIL("mmap() with hint failed: %s", strerror(errno));
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if (((unsigned long)q % hpage_size) != 0)
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FAIL("mmap() with hint at misaligned address");
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err = munmap(q, hpage_size);
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if (err != 0)
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FAIL("munmap() with hint failed: %s", strerror(errno));
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/* 2) Try a misaligned address with MAP_FIXED */
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q = mmap(p + page_size, hpage_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_FIXED, fd, 0);
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if (q != MAP_FAILED)
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FAIL("mmap() MAP_FIXED at misaligned address succeeded");
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/* 3) Try a misaligned length */
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q = mmap(NULL, page_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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if (test_compare_kver(buf.release, "3.10.0") < 0) {
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if (q != MAP_FAILED)
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FAIL("mmap() with misaligned length 0x%lx succeeded",
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page_size);
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} else {
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if (q == MAP_FAILED)
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FAIL("mmap() with misaligned length 0x%lx failed",
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page_size);
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}
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/* 4) Try a misaligned length with MAP_FIXED */
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q = mmap(p, page_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_FIXED, fd, 0);
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if (test_compare_kver(buf.release, "3.10.0") < 0) {
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if (q != MAP_FAILED)
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FAIL("mmap() MAP_FIXED with misaligned length 0x%lx "
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"succeeded", page_size);
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} else {
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if (q == MAP_FAILED)
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FAIL("mmap() MAP_FIXED with misaligned length 0x%lx "
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"failed", page_size);
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}
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/* 5) Try a misaligned offset */
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q = mmap(NULL, hpage_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE, fd, page_size);
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if (q != MAP_FAILED)
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FAIL("mmap() with misaligned offset 0x%lx succeeded",
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page_size);
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/* 6) Try a misaligned offset with MAP_FIXED*/
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q = mmap(p, hpage_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_FIXED, fd, page_size);
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if (q != MAP_FAILED)
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FAIL("mmap() MAP_FIXED with misaligned offset 0x%lx succeeded",
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page_size);
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PASS();
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}
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