222 lines
7.8 KiB
C
222 lines
7.8 KiB
C
/*
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* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016 Red Hat, Inc.
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* Copyright (c) 2016-2017 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <asm/unistd.h>
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#if defined __NR_userfaultfd && defined HAVE_LINUX_USERFAULTFD_H
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# include <fcntl.h>
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# include <inttypes.h>
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# include <stdint.h>
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# include <stdio.h>
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# include <string.h>
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# include <unistd.h>
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# include <sys/ioctl.h>
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# include <sys/mman.h>
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# include <linux/ioctl.h>
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# include <linux/userfaultfd.h>
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#include "xlat.h"
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#include "xlat/uffd_api_features.h"
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int
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main(void)
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{
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int rc;
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int fd = syscall(__NR_userfaultfd, O_NONBLOCK);
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size_t pagesize = getpagesize();
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if (fd < 0)
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perror_msg_and_skip("userfaultfd");
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/* ---- API ---- */
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TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_api, api_struct);
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/* With a bad fd */
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memset(api_struct, 0, sizeof(*api_struct));
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rc = ioctl(-1, UFFDIO_API, api_struct);
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printf("ioctl(-1, UFFDIO_API, {api=0, features=0}) = %d %s (%m)\n",
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rc, errno2name());
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/* With a bad pointer */
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rc = ioctl(fd, UFFDIO_API, NULL);
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printf("ioctl(%d, UFFDIO_API, NULL) = %d %s (%m)\n",
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fd, rc, errno2name());
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/* Normal call */
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api_struct->api = UFFD_API;
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api_struct->features = 0;
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rc = ioctl(fd, UFFDIO_API, api_struct);
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printf("ioctl(%d, UFFDIO_API, {api=0xaa, features=0", fd);
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if (api_struct->features) {
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printf(" => features=");
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printflags(uffd_api_features, api_struct->features,
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"UFFD_FEATURE_???");
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}
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printf(", ioctls=1<<_UFFDIO_REGISTER|"
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"1<<_UFFDIO_UNREGISTER|1<<_UFFDIO_API");
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api_struct->ioctls &= ~(1ull<<_UFFDIO_REGISTER|
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1ull<<_UFFDIO_UNREGISTER|
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1ull<<_UFFDIO_API);
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if (api_struct->ioctls)
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printf("|%#" PRIx64, (uint64_t)api_struct->ioctls);
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printf("}) = %d\n", rc);
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/* For the rest of the tests we need some anonymous memory */
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void *area1 = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS,
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-1, 0);
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if (area1 == MAP_FAILED)
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perror_msg_and_fail("mmap area1");
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void *area2 = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS,
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-1, 0);
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if (area2 == MAP_FAILED)
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perror_msg_and_fail("mmap area2");
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madvise(area2, pagesize, MADV_DONTNEED);
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*(char *)area1 = 42;
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/* ---- REGISTER ---- */
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struct uffdio_register *register_struct =
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tail_alloc(sizeof(*register_struct));
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memset(register_struct, 0, sizeof(*register_struct));
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rc = ioctl(-1, UFFDIO_REGISTER, register_struct);
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printf("ioctl(-1, UFFDIO_REGISTER, {range={start=0, len=0}, "
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"mode=0}) = %d %s (%m)\n", rc, errno2name());
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rc = ioctl(fd, UFFDIO_REGISTER, NULL);
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printf("ioctl(%d, UFFDIO_REGISTER, NULL) = %d %s (%m)\n",
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fd, rc, errno2name());
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register_struct->range.start = (uint64_t)(uintptr_t)area2;
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register_struct->range.len = pagesize;
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register_struct->mode = UFFDIO_REGISTER_MODE_MISSING;
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rc = ioctl(fd, UFFDIO_REGISTER, register_struct);
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printf("ioctl(%d, UFFDIO_REGISTER, {range={start=%p, len=%#zx}, "
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"mode=UFFDIO_REGISTER_MODE_MISSING, ioctls="
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"1<<_UFFDIO_WAKE|1<<_UFFDIO_COPY|1<<_UFFDIO_ZEROPAGE",
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fd, area2, pagesize);
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register_struct->ioctls &= ~(1ull<<_UFFDIO_WAKE|
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1ull<<_UFFDIO_COPY|
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1ull<<_UFFDIO_ZEROPAGE);
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if (register_struct->ioctls)
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printf("|%#" PRIx64, (uint64_t)register_struct->ioctls);
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printf("}) = %d\n", rc);
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/* With area2 registered we can now do the atomic copies onto it
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* but be careful not to access it in any other way otherwise
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* userfaultfd will cause us to stall.
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*/
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/* ---- COPY ---- */
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TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_copy, copy_struct);
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memset(copy_struct, 0, sizeof(*copy_struct));
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rc = ioctl(-1, UFFDIO_COPY, copy_struct);
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printf("ioctl(-1, UFFDIO_COPY, {dst=0, src=0, len=0, mode=0"
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"}) = %d %s (%m)\n", rc, errno2name());
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rc = ioctl(fd, UFFDIO_COPY, NULL);
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printf("ioctl(%d, UFFDIO_COPY, NULL) = %d %s (%m)\n",
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fd, rc, errno2name());
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copy_struct->dst = (uint64_t)(uintptr_t)area2;
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copy_struct->src = (uint64_t)(uintptr_t)area1;
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copy_struct->len = pagesize;
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copy_struct->mode = UFFDIO_COPY_MODE_DONTWAKE;
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rc = ioctl(fd, UFFDIO_COPY, copy_struct);
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printf("ioctl(%d, UFFDIO_COPY, {dst=%p, src=%p, len=%#zx,"
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" mode=UFFDIO_COPY_MODE_DONTWAKE, copy=%#zx}) = %d\n",
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fd, area2, area1, pagesize, pagesize, rc);
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/* ---- ZEROPAGE ---- */
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TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_zeropage, zero_struct);
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madvise(area2, pagesize, MADV_DONTNEED);
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memset(zero_struct, 0, sizeof(*zero_struct));
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rc = ioctl(-1, UFFDIO_ZEROPAGE, zero_struct);
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printf("ioctl(-1, UFFDIO_ZEROPAGE, {range={start=0, len=0}, mode=0"
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"}) = %d %s (%m)\n", rc, errno2name());
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rc = ioctl(fd, UFFDIO_ZEROPAGE, NULL);
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printf("ioctl(%d, UFFDIO_ZEROPAGE, NULL) = %d %s (%m)\n",
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fd, rc, errno2name());
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zero_struct->range.start = (uint64_t)(uintptr_t)area2;
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zero_struct->range.len = pagesize;
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zero_struct->mode = UFFDIO_ZEROPAGE_MODE_DONTWAKE;
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rc = ioctl(fd, UFFDIO_ZEROPAGE, zero_struct);
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printf("ioctl(%d, UFFDIO_ZEROPAGE, {range={start=%p, len=%#zx},"
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" mode=UFFDIO_ZEROPAGE_MODE_DONTWAKE, zeropage=%#zx}) = %d\n",
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fd, area2, pagesize, pagesize, rc);
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/* ---- WAKE ---- */
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TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_range, range_struct);
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memset(range_struct, 0, sizeof(*range_struct));
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rc = ioctl(-1, UFFDIO_WAKE, range_struct);
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printf("ioctl(-1, UFFDIO_WAKE, {start=0, len=0}) = %d %s (%m)\n",
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rc, errno2name());
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rc = ioctl(fd, UFFDIO_WAKE, NULL);
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printf("ioctl(%d, UFFDIO_WAKE, NULL) = %d %s (%m)\n",
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fd, rc, errno2name());
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range_struct->start = (uint64_t)(uintptr_t)area2;
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range_struct->len = pagesize;
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rc = ioctl(fd, UFFDIO_WAKE, range_struct);
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printf("ioctl(%d, UFFDIO_WAKE, {start=%p, len=%#zx}) = %d\n",
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fd, area2, pagesize, rc);
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/* ---- UNREGISTER ---- */
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memset(range_struct, 0, sizeof(*range_struct));
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rc = ioctl(-1, UFFDIO_UNREGISTER, range_struct);
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printf("ioctl(-1, UFFDIO_UNREGISTER, {start=0, len=0}) = %d %s (%m)\n",
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rc, errno2name());
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rc = ioctl(fd, UFFDIO_UNREGISTER, NULL);
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printf("ioctl(%d, UFFDIO_UNREGISTER, NULL) = %d %s (%m)\n",
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fd, rc, errno2name());
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range_struct->start = (uint64_t)(uintptr_t)area2;
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range_struct->len = pagesize;
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rc = ioctl(fd, UFFDIO_UNREGISTER, range_struct);
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printf("ioctl(%d, UFFDIO_UNREGISTER, {start=%p, len=%#zx}) = %d\n",
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fd, area2, pagesize, rc);
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puts("+++ exited with 0 +++");
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return 0;
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}
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#else
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SKIP_MAIN_UNDEFINED("__NR_userfaultfd && HAVE_LINUX_USERFAULTFD_H")
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#endif
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