2 * Copyright (c) 2015, 2020 The FreeBSD Foundation
5 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
6 * under sponsorship from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/sysctl.h>
47 #include <machine/vmparam.h>
49 static int scratch_file;
52 copyin_checker(uintptr_t uaddr, size_t len)
56 ret = write(scratch_file, (const void *)uaddr, len);
57 return (ret == -1 ? errno : 0);
60 #if __SIZEOF_POINTER__ == 8
62 * A slightly more direct path to calling copyin(), but without the ability
63 * to specify a length.
66 copyin_checker2(uintptr_t uaddr)
70 ret = fcntl(scratch_file, F_GETLK, (const void *)uaddr);
71 return (ret == -1 ? errno : 0);
77 get_maxuser_address(void)
79 struct kinfo_vm_layout kvm;
85 mib[2] = KERN_PROC_VM_LAYOUT;
88 error = sysctl(mib, nitems(mib), &kvm, &len, NULL, 0);
92 return (kvm.kvm_max_user_addr);
96 #define FMAX ULONG_MAX
97 #if __SIZEOF_POINTER__ == 8
99 #define ADDR_SIGNED 0x800000c000000000
102 ATF_TC_WITHOUT_HEAD(kern_copyin);
103 ATF_TC_BODY(kern_copyin, tc)
105 char template[] = "copyin.XXXXXX";
108 #if defined(__mips__)
110 * MIPS has different VM layout: the UVA map on mips ends the
111 * highest mapped entry at the VM_MAXUSER_ADDRESS - PAGE_SIZE,
112 * while all other arches map either stack or shared page up
113 * to the VM_MAXUSER_ADDRESS.
115 maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE;
116 #elif defined(__amd64__)
117 maxuser = get_maxuser_address();
118 ATF_REQUIRE(maxuser != 0);
120 maxuser = VM_MAXUSER_ADDRESS;
123 scratch_file = mkstemp(template);
124 ATF_REQUIRE(scratch_file != -1);
127 ATF_CHECK(copyin_checker(0, 0) == 0);
128 ATF_CHECK(copyin_checker(maxuser - 10, 9) == 0);
129 ATF_CHECK(copyin_checker(maxuser - 10, 10) == 0);
130 ATF_CHECK(copyin_checker(maxuser - 10, 11) == EFAULT);
131 ATF_CHECK(copyin_checker(maxuser - 1, 1) == 0);
132 ATF_CHECK(copyin_checker(maxuser, 0) == 0);
133 ATF_CHECK(copyin_checker(maxuser, 1) == EFAULT);
134 ATF_CHECK(copyin_checker(maxuser, 2) == EFAULT);
135 ATF_CHECK(copyin_checker(maxuser + 1, 0) == 0);
136 ATF_CHECK(copyin_checker(maxuser + 1, 2) == EFAULT);
137 ATF_CHECK(copyin_checker(FMAX - 10, 9) == EFAULT);
138 ATF_CHECK(copyin_checker(FMAX - 10, 10) == EFAULT);
139 ATF_CHECK(copyin_checker(FMAX - 10, 11) == EFAULT);
140 #if __SIZEOF_POINTER__ == 8
141 ATF_CHECK(copyin_checker(ADDR_SIGNED, 1) == EFAULT);
142 ATF_CHECK(copyin_checker2(ADDR_SIGNED) == EFAULT);
149 ATF_TP_ADD_TC(tp, kern_copyin);
150 return (atf_no_error());