1 /* $NetBSD: t_mlock.c,v 1.5 2014/02/26 20:49:26 martin Exp $ */
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: t_mlock.c,v 1.5 2014/02/26 20:49:26 martin Exp $");
35 #include <sys/types.h>
38 #include <sys/resource.h>
39 #include <sys/sysctl.h>
51 #include <machine/vmparam.h>
57 ATF_TC_HEAD(mlock_clip, tc)
59 atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only "
60 "clips if the clip address is within the entry (PR kern/44788)");
63 ATF_TC_BODY(mlock_clip, tc)
68 ATF_REQUIRE(buf != NULL);
71 atf_tc_skip("page size too small");
73 for (size_t i = page; i >= 1; i = i - 1024) {
74 (void)mlock(buf, page - i);
75 (void)munlock(buf, page - i);
82 ATF_TC_HEAD(mlock_err, tc)
84 atf_tc_set_md_var(tc, "descr",
85 "Test error conditions in mlock(2) and munlock(2)");
88 ATF_TC_BODY(mlock_err, tc)
91 unsigned long vmin = 0;
92 size_t len = sizeof(vmin);
95 int null_errno = ENOMEM; /* error expected for NULL */
99 if ((uintptr_t)VM_MIN_ADDRESS > 0)
100 null_errno = EINVAL; /* NULL is not inside user VM */
103 if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0)
104 atf_tc_fail("failed to read vm.minaddress");
107 null_errno = EINVAL; /* NULL is not inside user VM */
111 ATF_REQUIRE_ERRNO(null_errno, mlock(NULL, page) == -1);
114 ATF_REQUIRE_ERRNO(null_errno, mlock((char *)0, page) == -1);
117 ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1);
120 ATF_REQUIRE_ERRNO(null_errno, munlock(NULL, page) == -1);
123 ATF_REQUIRE_ERRNO(null_errno, munlock((char *)0, page) == -1);
126 ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1);
129 * Try to create a pointer to an unmapped page - first after current
130 * brk will likely do.
132 invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1));
133 printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr);
136 ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1);
139 ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1);
142 ATF_TC(mlock_limits);
143 ATF_TC_HEAD(mlock_limits, tc)
145 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)");
148 ATF_TC_BODY(mlock_limits, tc)
156 ATF_REQUIRE(buf != NULL);
159 ATF_REQUIRE(pid >= 0);
163 for (ssize_t i = page; i >= 2; i -= 100) {
165 res.rlim_cur = i - 1;
166 res.rlim_max = i - 1;
168 (void)fprintf(stderr, "trying to lock %zd bytes "
169 "with %zu byte limit\n", i, (size_t)res.rlim_cur);
171 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0)
178 * NetBSD doesn't conform to POSIX with ENOMEM requirement;
181 * See: NetBSD PR # kern/48962 for more details.
183 if (mlock(buf, i) != -1 || errno != ENOMEM) {
185 if (mlock(buf, i) != -1 || errno != EAGAIN) {
187 (void)munlock(buf, i);
197 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
198 atf_tc_fail("mlock(2) locked beyond system limits");
204 ATF_TC_HEAD(mlock_mmap, tc)
206 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction");
209 ATF_TC_BODY(mlock_mmap, tc)
212 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED;
214 static const int flags = MAP_ANON | MAP_PRIVATE;
219 * Make a wired RW mapping and check that mlock(2)
220 * does not fail for the (already locked) mapping.
222 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0);
224 ATF_REQUIRE(buf != MAP_FAILED);
227 * The duplicate mlock call is added to ensure that the call works
228 * as described above without MAP_WIRED support.
230 ATF_REQUIRE(mlock(buf, page) == 0);
232 ATF_REQUIRE(mlock(buf, page) == 0);
233 ATF_REQUIRE(munlock(buf, page) == 0);
234 ATF_REQUIRE(munmap(buf, page) == 0);
235 ATF_REQUIRE(munlock(buf, page) != 0);
238 * But it should be impossible to mlock(2) a PROT_NONE mapping.
240 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0);
242 ATF_REQUIRE(buf != MAP_FAILED);
244 ATF_REQUIRE_ERRNO(ENOMEM, mlock(buf, page) != 0);
246 ATF_REQUIRE(mlock(buf, page) != 0);
248 ATF_REQUIRE(munmap(buf, page) == 0);
251 ATF_TC(mlock_nested);
252 ATF_TC_HEAD(mlock_nested, tc)
254 atf_tc_set_md_var(tc, "descr",
255 "Test that consecutive mlock(2) calls succeed");
258 ATF_TC_BODY(mlock_nested, tc)
260 const size_t maxiter = 100;
264 ATF_REQUIRE(buf != NULL);
266 for (size_t i = 0; i < maxiter; i++)
267 ATF_REQUIRE(mlock(buf, page) == 0);
269 ATF_REQUIRE(munlock(buf, page) == 0);
276 page = sysconf(_SC_PAGESIZE);
277 ATF_REQUIRE(page >= 0);
279 ATF_TP_ADD_TC(tp, mlock_clip);
280 ATF_TP_ADD_TC(tp, mlock_err);
281 ATF_TP_ADD_TC(tp, mlock_limits);
282 ATF_TP_ADD_TC(tp, mlock_mmap);
283 ATF_TP_ADD_TC(tp, mlock_nested);
285 return atf_no_error();