134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2015-2017 Red Hat, Inc.
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*
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* DESCRIPTION
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*
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* There is a race condition if we map a same file on different processes.
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* Region tracking is protected by mmap_sem and hugetlb_instantiation_mutex.
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* When we do mmap, we don't grab a hugetlb_instantiation_mutex, but only
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* mmap_sem (exclusively). This doesn't prevent other tasks from modifying
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* the region structure, so it can be modified by two processes concurrently.
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*
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* This bug was fixed on stable kernel by commits:
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* f522c3ac00a4(mm, hugetlb: change variable name reservations to resv)
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* 9119a41e9091(mm, hugetlb: unify region structure handling)
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* 7b24d8616be3(mm, hugetlb: fix race in region tracking)
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* 1406ec9ba6c6(mm, hugetlb: improve, cleanup resv_map parameters)
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*
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* AUTHOR:
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* Herton R. Krzesinski <herton@redhat.com>
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* Li Wang <liwang@redhat.com>
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*/
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#define _GNU_SOURCE
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#include <pthread.h>
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#include <stdio.h>
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#include "hugetlb.h"
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#include "lapi/mmap.h"
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static long hpage_size;
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struct mp {
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char *addr;
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int sz;
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};
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#define ARSZ 50
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#define LOOP 5
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static void setup(void)
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{
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if (tst_hugepages != test.request_hugepages)
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tst_brk(TCONF, "System RAM is not enough to test.");
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hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
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}
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static void *thr(void *arg)
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{
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struct mp *mmap_sz = arg;
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int i, lim, a, b, c;
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srand(time(NULL));
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lim = rand() % 10;
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for (i = 0; i < lim; i++) {
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a = rand() % mmap_sz->sz;
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for (c = 0; c <= a; c++) {
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b = rand() % mmap_sz->sz;
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*(mmap_sz->addr + b * hpage_size) = rand();
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}
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}
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return NULL;
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}
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static void do_mmap(unsigned int j LTP_ATTRIBUTE_UNUSED)
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{
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int i, sz = ARSZ + 1;
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void *addr, *new_addr;
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struct mp mmap_sz[ARSZ];
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pthread_t tid[ARSZ];
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addr = mmap(NULL, sz * hpage_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
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-1, 0);
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if (addr == MAP_FAILED) {
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if (errno == ENOMEM) {
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tst_brk(TCONF,
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"Cannot allocate hugepage, memory too fragmented?");
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}
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tst_brk(TBROK | TERRNO, "Cannot allocate hugepage");
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}
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for (i = 0; i < ARSZ; ++i, --sz) {
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mmap_sz[i].sz = sz;
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mmap_sz[i].addr = addr;
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TEST(pthread_create(&tid[i], NULL, thr, &mmap_sz[i]));
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if (TST_RET)
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tst_brk(TBROK | TRERRNO,
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"pthread_create failed");
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new_addr = mmap(addr, (sz - 1) * hpage_size,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_FIXED,
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-1, 0);
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if (new_addr == MAP_FAILED)
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tst_brk(TFAIL | TERRNO, "mmap failed");
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addr = new_addr;
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}
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for (i = 0; i < ARSZ; ++i) {
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TEST(pthread_join(tid[i], NULL));
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if (TST_RET)
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tst_brk(TBROK | TRERRNO,
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"pthread_join failed");
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}
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if (munmap(addr, sz * hpage_size) == -1)
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tst_brk(TFAIL | TERRNO, "huge munmap failed");
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tst_res(TPASS, "No regression found.");
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}
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static struct tst_test test = {
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.min_kver = "2.6.32",
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.needs_root = 1,
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.tcnt = LOOP,
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.needs_tmpdir = 1,
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.test = do_mmap,
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.setup = setup,
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.request_hugepages = (ARSZ + 1) * LOOP,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "f522c3ac00a4"},
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{"linux-git", "9119a41e9091"},
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{"linux-git", "7b24d8616be3"},
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{"linux-git", "1406ec9ba6c6"},
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{}
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}
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};
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