103 lines
2.5 KiB
C
103 lines
2.5 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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*
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* DESCRIPTION
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* shmget()/shmat() fails to allocate huge pages shared memory segment
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* with EINVAL if its size is not in the range [ N*HUGE_PAGE_SIZE - 4095,
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* N*HUGE_PAGE_SIZE ]. This is a problem in the memory segment size round
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* up algorithm. The requested size is rounded up to PAGE_SIZE (4096), but
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* if this roundup does not match HUGE_PAGE_SIZE (2Mb) boundary - the
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* allocation fails.
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*
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* This bug is present in all RHEL6 versions, but not in RHEL7. It looks
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* like this was fixed in mainline kernel > v3.3 by the following patches:
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*
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* 091d0d55b286 (shm: fix null pointer deref when userspace specifies
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* invalid hugepage size)
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* af73e4d9506d (hugetlbfs: fix mmap failure in unaligned size request)
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* 42d7395feb56 (mm: support more pagesizes for MAP_HUGETLB/SHM_HUGETLB)
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* 40716e29243d (hugetlbfs: fix alignment of huge page requests)
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*
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* AUTHORS
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* Vladislav Dronov <vdronov@redhat.com>
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* Li Wang <liwang@redhat.com>
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*
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*/
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#include "hugetlb.h"
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static long page_size;
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static long hpage_size;
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#define N 4
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void setup(void)
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{
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if (tst_hugepages != test.request_hugepages)
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tst_brk(TCONF, "Not enough hugepages for testing.");
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page_size = getpagesize();
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hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
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}
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void shm_test(int size)
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{
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int shmid;
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char *shmaddr;
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shmid = shmget(IPC_PRIVATE, size, 0600 | IPC_CREAT | SHM_HUGETLB);
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if (shmid < 0)
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tst_brk(TBROK | TERRNO, "shmget failed");
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shmaddr = shmat(shmid, 0, 0);
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if (shmaddr == (char *)-1) {
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shmctl(shmid, IPC_RMID, NULL);
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tst_brk(TFAIL | TERRNO,
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"Bug: shared memory attach failure.");
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}
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shmaddr[0] = 1;
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tst_res(TINFO, "allocated %d huge bytes", size);
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if (shmdt((const void *)shmaddr) != 0) {
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shmctl(shmid, IPC_RMID, NULL);
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tst_brk(TFAIL | TERRNO, "Detach failure.");
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}
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shmctl(shmid, IPC_RMID, NULL);
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}
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static void test_hugeshmat(void)
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{
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unsigned int i;
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const int tst_sizes[] = {
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N * hpage_size - page_size,
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N * hpage_size - page_size - 1,
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hpage_size,
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hpage_size + 1
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};
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for (i = 0; i < ARRAY_SIZE(tst_sizes); ++i)
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shm_test(tst_sizes[i]);
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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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.needs_root = 1,
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.needs_tmpdir = 1,
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.test_all = test_hugeshmat,
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.setup = setup,
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.request_hugepages = N + 1,
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.tags = (const struct tst_tag[]) {
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{"linux-git", "091d0d55b286"},
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{"linux-git", "af73e4d9506d"},
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{"linux-git", "42d7395feb56"},
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{"linux-git", "40716e29243d"},
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{}
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}
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};
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