2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2019 Mark Johnston <markj@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
30 #include <sys/ptrace.h>
42 test_wired_copy_on_write(void *addr, size_t len)
49 atf_tc_fail("fork() failed: %s", strerror(errno));
51 if (mlock(addr, len) != 0)
53 if (ptrace(PT_TRACE_ME, 0, NULL, 0) != 0)
55 if (raise(SIGSTOP) != 0)
57 if (munlock(addr, len) != 0)
62 ATF_REQUIRE(waitpid(pid, &status, 0) == pid);
63 ATF_REQUIRE_MSG(!WIFEXITED(status),
64 "child exited with status %d", WEXITSTATUS(status));
65 ATF_REQUIRE(WIFSTOPPED(status));
66 ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
69 val = ptrace(PT_READ_D, pid, addr, 0);
70 ATF_REQUIRE(errno == 0);
71 ATF_REQUIRE(ptrace(PT_WRITE_D, pid, addr, val) == 0);
72 ATF_REQUIRE(ptrace(PT_CONTINUE, pid, (caddr_t)1, 0) == 0);
73 ATF_REQUIRE(waitpid(pid, &status, 0) == pid);
74 ATF_REQUIRE(WIFEXITED(status));
75 ATF_REQUIRE_MSG(WEXITSTATUS(status) == 0,
76 "child exited with status %d", WSTOPSIG(status));
80 * Use ptrace(2) to trigger a copy-on-write fault of anonymous memory.
82 ATF_TC_WITHOUT_HEAD(mlock__copy_on_write_anon);
83 ATF_TC_BODY(mlock__copy_on_write_anon, tc)
89 addr = mmap(NULL, len, PROT_READ, MAP_ANON, -1, 0);
90 ATF_REQUIRE(addr != MAP_FAILED);
92 test_wired_copy_on_write(addr, len);
96 * Use ptrace(2) to trigger a copy-on-write fault of a read-only text page.
98 ATF_TC_WITHOUT_HEAD(mlock__copy_on_write_vnode);
99 ATF_TC_BODY(mlock__copy_on_write_vnode, tc)
105 addr = (void *)((uintptr_t)test_wired_copy_on_write & ~(len - 1));
107 test_wired_copy_on_write(addr, len);
111 * Try truncating and then resizing an mlock()ed mapping.
113 ATF_TC_WITHOUT_HEAD(mlock__truncate_and_resize);
114 ATF_TC_BODY(mlock__truncate_and_resize, tc)
120 snprintf(filename, sizeof(filename), "tmp.XXXXXX");
121 fd = mkstemp(filename);
122 ATF_REQUIRE(fd >= 0);
123 ATF_REQUIRE(unlink(filename) == 0);
126 ATF_REQUIRE(ftruncate(fd, len) == 0);
128 addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
129 ATF_REQUIRE(addr != MAP_FAILED);
130 ATF_REQUIRE(mlock(addr, len) == 0);
131 memset(addr, 1, len);
132 ATF_REQUIRE(ftruncate(fd, 0) == 0);
133 ATF_REQUIRE(ftruncate(fd, len) == 0);
134 for (i = 0; i < len; i++)
135 ATF_REQUIRE(addr[i] == 0);
136 ATF_REQUIRE(munlock(addr, len) == 0);
140 * Make sure that we can munlock() a truncated mapping.
142 ATF_TC_WITHOUT_HEAD(mlock__truncate_and_unlock);
143 ATF_TC_BODY(mlock__truncate_and_unlock, tc)
149 snprintf(filename, sizeof(filename), "tmp.XXXXXX");
150 fd = mkstemp(filename);
151 ATF_REQUIRE(fd >= 0);
152 ATF_REQUIRE(unlink(filename) == 0);
155 ATF_REQUIRE(ftruncate(fd, len) == 0);
157 addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
158 ATF_REQUIRE(addr != MAP_FAILED);
159 ATF_REQUIRE(mlock(addr, len) == 0);
160 ATF_REQUIRE(ftruncate(fd, 0) == 0);
161 ATF_REQUIRE(munlock(addr, len) == 0);
166 ATF_TP_ADD_TC(tp, mlock__copy_on_write_anon);
167 ATF_TP_ADD_TC(tp, mlock__copy_on_write_vnode);
168 ATF_TP_ADD_TC(tp, mlock__truncate_and_resize);
169 ATF_TP_ADD_TC(tp, mlock__truncate_and_unlock);
171 return (atf_no_error());