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/*
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016 Red Hat, Inc.
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include "kernel_fcntl.h"
#include <linux/ioctl.h>
#include <linux/userfaultfd.h>
#include "xlat.h"
#include "xlat/uffd_api_features.h"
int
main(void)
{
int rc;
int fd = syscall(__NR_userfaultfd, O_NONBLOCK);
size_t pagesize = getpagesize();
if (fd < 0)
perror_msg_and_skip("userfaultfd");
/* ---- API ---- */
TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_api, api_struct);
/* With a bad fd */
memset(api_struct, 0, sizeof(*api_struct));
rc = ioctl(-1, UFFDIO_API, api_struct);
printf("ioctl(-1, UFFDIO_API, {api=0, features=0}) = %d %s (%m)\n",
rc, errno2name());
/* With a bad pointer */
rc = ioctl(fd, UFFDIO_API, NULL);
printf("ioctl(%d, UFFDIO_API, NULL) = %d %s (%m)\n",
fd, rc, errno2name());
/* Normal call */
api_struct->api = UFFD_API;
api_struct->features = 0;
rc = ioctl(fd, UFFDIO_API, api_struct);
printf("ioctl(%d, UFFDIO_API, {api=0xaa, features=0", fd);
if (api_struct->features) {
printf(" => features=");
printflags(uffd_api_features, api_struct->features,
"UFFD_FEATURE_???");
}
printf(", ioctls=1<<_UFFDIO_REGISTER|"
"1<<_UFFDIO_UNREGISTER|1<<_UFFDIO_API");
api_struct->ioctls &= ~(1ull<<_UFFDIO_REGISTER|
1ull<<_UFFDIO_UNREGISTER|
1ull<<_UFFDIO_API);
if (api_struct->ioctls)
printf("|%#" PRIx64, (uint64_t)api_struct->ioctls);
printf("}) = %d\n", rc);
/* For the rest of the tests we need some anonymous memory */
void *area1 = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0);
if (area1 == MAP_FAILED)
perror_msg_and_fail("mmap area1");
void *area2 = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0);
if (area2 == MAP_FAILED)
perror_msg_and_fail("mmap area2");
madvise(area2, pagesize, MADV_DONTNEED);
*(char *)area1 = 42;
/* ---- REGISTER ---- */
struct uffdio_register *register_struct =
tail_alloc(sizeof(*register_struct));
memset(register_struct, 0, sizeof(*register_struct));
rc = ioctl(-1, UFFDIO_REGISTER, register_struct);
printf("ioctl(-1, UFFDIO_REGISTER, {range={start=0, len=0}, "
"mode=0}) = %d %s (%m)\n", rc, errno2name());
rc = ioctl(fd, UFFDIO_REGISTER, NULL);
printf("ioctl(%d, UFFDIO_REGISTER, NULL) = %d %s (%m)\n",
fd, rc, errno2name());
register_struct->range.start = (uint64_t)(uintptr_t)area2;
register_struct->range.len = pagesize;
register_struct->mode = UFFDIO_REGISTER_MODE_MISSING;
rc = ioctl(fd, UFFDIO_REGISTER, register_struct);
printf("ioctl(%d, UFFDIO_REGISTER, {range={start=%p, len=%#zx}, "
"mode=UFFDIO_REGISTER_MODE_MISSING, ioctls="
"1<<_UFFDIO_WAKE|1<<_UFFDIO_COPY|1<<_UFFDIO_ZEROPAGE",
fd, area2, pagesize);
register_struct->ioctls &= ~(1ull<<_UFFDIO_WAKE|
1ull<<_UFFDIO_COPY|
1ull<<_UFFDIO_ZEROPAGE);
if (register_struct->ioctls)
printf("|%#" PRIx64, (uint64_t)register_struct->ioctls);
printf("}) = %d\n", rc);
/* With area2 registered we can now do the atomic copies onto it
* but be careful not to access it in any other way otherwise
* userfaultfd will cause us to stall.
*/
/* ---- COPY ---- */
TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_copy, copy_struct);
memset(copy_struct, 0, sizeof(*copy_struct));
rc = ioctl(-1, UFFDIO_COPY, copy_struct);
printf("ioctl(-1, UFFDIO_COPY, {dst=0, src=0, len=0, mode=0"
"}) = %d %s (%m)\n", rc, errno2name());
rc = ioctl(fd, UFFDIO_COPY, NULL);
printf("ioctl(%d, UFFDIO_COPY, NULL) = %d %s (%m)\n",
fd, rc, errno2name());
copy_struct->dst = (uint64_t)(uintptr_t)area2;
copy_struct->src = (uint64_t)(uintptr_t)area1;
copy_struct->len = pagesize;
copy_struct->mode = UFFDIO_COPY_MODE_DONTWAKE;
rc = ioctl(fd, UFFDIO_COPY, copy_struct);
printf("ioctl(%d, UFFDIO_COPY, {dst=%p, src=%p, len=%#zx,"
" mode=UFFDIO_COPY_MODE_DONTWAKE, copy=%#zx}) = %d\n",
fd, area2, area1, pagesize, pagesize, rc);
copy_struct->mode = 0xdeadbeef;;
rc = ioctl(fd, UFFDIO_COPY, copy_struct);
printf("ioctl(%d, UFFDIO_COPY, {dst=%p, src=%p, len=%#zx,"
" mode=UFFDIO_COPY_MODE_DONTWAKE|UFFDIO_COPY_MODE_WP|0xdeadbeec"
"}) = %s\n",
fd, area2, area1, pagesize, sprintrc(rc));
/* ---- ZEROPAGE ---- */
TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_zeropage, zero_struct);
madvise(area2, pagesize, MADV_DONTNEED);
memset(zero_struct, 0, sizeof(*zero_struct));
rc = ioctl(-1, UFFDIO_ZEROPAGE, zero_struct);
printf("ioctl(-1, UFFDIO_ZEROPAGE, {range={start=0, len=0}, mode=0"
"}) = %d %s (%m)\n", rc, errno2name());
rc = ioctl(fd, UFFDIO_ZEROPAGE, NULL);
printf("ioctl(%d, UFFDIO_ZEROPAGE, NULL) = %d %s (%m)\n",
fd, rc, errno2name());
zero_struct->range.start = (uint64_t)(uintptr_t)area2;
zero_struct->range.len = pagesize;
zero_struct->mode = UFFDIO_ZEROPAGE_MODE_DONTWAKE;
rc = ioctl(fd, UFFDIO_ZEROPAGE, zero_struct);
printf("ioctl(%d, UFFDIO_ZEROPAGE, {range={start=%p, len=%#zx},"
" mode=UFFDIO_ZEROPAGE_MODE_DONTWAKE, zeropage=%#zx}) = %d\n",
fd, area2, pagesize, pagesize, rc);
/* ---- WAKE ---- */
TAIL_ALLOC_OBJECT_CONST_PTR(struct uffdio_range, range_struct);
memset(range_struct, 0, sizeof(*range_struct));
rc = ioctl(-1, UFFDIO_WAKE, range_struct);
printf("ioctl(-1, UFFDIO_WAKE, {start=0, len=0}) = %d %s (%m)\n",
rc, errno2name());
rc = ioctl(fd, UFFDIO_WAKE, NULL);
printf("ioctl(%d, UFFDIO_WAKE, NULL) = %d %s (%m)\n",
fd, rc, errno2name());
range_struct->start = (uint64_t)(uintptr_t)area2;
range_struct->len = pagesize;
rc = ioctl(fd, UFFDIO_WAKE, range_struct);
printf("ioctl(%d, UFFDIO_WAKE, {start=%p, len=%#zx}) = %d\n",
fd, area2, pagesize, rc);
/* ---- UNREGISTER ---- */
memset(range_struct, 0, sizeof(*range_struct));
rc = ioctl(-1, UFFDIO_UNREGISTER, range_struct);
printf("ioctl(-1, UFFDIO_UNREGISTER, {start=0, len=0}) = %d %s (%m)\n",
rc, errno2name());
rc = ioctl(fd, UFFDIO_UNREGISTER, NULL);
printf("ioctl(%d, UFFDIO_UNREGISTER, NULL) = %d %s (%m)\n",
fd, rc, errno2name());
range_struct->start = (uint64_t)(uintptr_t)area2;
range_struct->len = pagesize;
rc = ioctl(fd, UFFDIO_UNREGISTER, range_struct);
printf("ioctl(%d, UFFDIO_UNREGISTER, {start=%p, len=%#zx}) = %d\n",
fd, area2, pagesize, rc);
puts("+++ exited with 0 +++");
return 0;
}
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