1 /* $NetBSD: t_mlock.c,v 1.6 2016/08/09 12:02:44 kre 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 1.6 2016/08/09 12:02:44 kre Exp $");
35 #include <sys/param.h> /* NetBSD requires sys/param.h for sysctl(3), unlike FreeBSD */
38 #include <sys/resource.h>
39 #include <sys/sysctl.h>
52 #include <machine/vmparam.h>
54 void set_vm_max_wired(int);
55 void restore_vm_max_wired(void);
61 ATF_TC_HEAD(mlock_clip, tc)
63 atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only "
64 "clips if the clip address is within the entry (PR kern/44788)");
67 ATF_TC_BODY(mlock_clip, tc)
72 ATF_REQUIRE(buf != NULL);
75 atf_tc_skip("page size too small");
77 for (size_t i = page; i >= 1; i = i - 1024) {
78 (void)mlock(buf, page - i);
79 (void)munlock(buf, page - i);
86 ATF_TC_WITH_CLEANUP(mlock_err);
90 ATF_TC_HEAD(mlock_err, tc)
92 atf_tc_set_md_var(tc, "descr",
93 "Test error conditions in mlock(2) and munlock(2)");
95 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
96 atf_tc_set_md_var(tc, "require.user", "root");
100 ATF_TC_BODY(mlock_err, tc)
103 unsigned long vmin = 0;
104 size_t len = sizeof(vmin);
107 int null_errno = ENOMEM; /* error expected for NULL */
111 #ifdef VM_MIN_ADDRESS
112 if ((uintptr_t)VM_MIN_ADDRESS > 0)
113 null_errno = EINVAL; /* NULL is not inside user VM */
115 /* Set max_wired really really high to avoid EAGAIN */
116 set_vm_max_wired(INT_MAX);
118 if (sysctlbyname("vm.minaddress", &vmin, &len, NULL, 0) != 0)
119 atf_tc_fail("failed to read vm.minaddress");
121 * Any bad address must return ENOMEM (for lock & unlock)
124 ATF_REQUIRE_ERRNO(ENOMEM, mlock(NULL, page) == -1);
127 null_errno = EINVAL; /* NULL is not inside user VM */
131 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1);
134 ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)-1, page) == -1);
137 ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1);
140 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1);
143 ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)-1, page) == -1);
146 ATF_REQUIRE(buf != NULL);
149 * unlocking memory that is not locked is an error...
153 ATF_REQUIRE_ERRNO(ENOMEM, munlock(buf, page) == -1);
156 * These are permitted to fail (EINVAL) but do not on NetBSD
158 ATF_REQUIRE(mlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0);
159 ATF_REQUIRE(munlock((void *)(((uintptr_t)buf) + page/3), page/5) == 0);
164 * Try to create a pointer to an unmapped page - first after current
165 * brk will likely do.
167 invalid_ptr = (void*)(((uintptr_t)sbrk(0)+page) & ~(page-1));
168 printf("testing with (hopefully) invalid pointer %p\n", invalid_ptr);
171 ATF_REQUIRE_ERRNO(ENOMEM, mlock(invalid_ptr, page) == -1);
174 ATF_REQUIRE_ERRNO(ENOMEM, munlock(invalid_ptr, page) == -1);
178 ATF_TC_CLEANUP(mlock_err, tc)
181 restore_vm_max_wired();
185 ATF_TC(mlock_limits);
186 ATF_TC_HEAD(mlock_limits, tc)
188 atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)");
191 ATF_TC_BODY(mlock_limits, tc)
199 ATF_REQUIRE(buf != NULL);
202 ATF_REQUIRE(pid >= 0);
206 for (ssize_t i = page; i >= 2; i -= 100) {
208 res.rlim_cur = i - 1;
209 res.rlim_max = i - 1;
211 (void)fprintf(stderr, "trying to lock %zd bytes "
212 "with %zu byte limit\n", i, (size_t)res.rlim_cur);
214 if (setrlimit(RLIMIT_MEMLOCK, &res) != 0)
221 * NetBSD doesn't conform to POSIX with ENOMEM requirement;
224 * See: NetBSD PR # kern/48962 for more details.
226 if (mlock(buf, i) != -1 || errno != ENOMEM) {
228 if (mlock(buf, i) != -1 || errno != EAGAIN) {
230 (void)munlock(buf, i);
240 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
241 atf_tc_fail("mlock(2) locked beyond system limits");
247 ATF_TC_WITH_CLEANUP(mlock_mmap);
251 ATF_TC_HEAD(mlock_mmap, tc)
253 atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction");
255 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
256 atf_tc_set_md_var(tc, "require.user", "root");
260 ATF_TC_BODY(mlock_mmap, tc)
263 static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED;
265 static const int flags = MAP_ANON | MAP_PRIVATE;
270 /* Set max_wired really really high to avoid EAGAIN */
271 set_vm_max_wired(INT_MAX);
275 * Make a wired RW mapping and check that mlock(2)
276 * does not fail for the (already locked) mapping.
278 buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0);
280 ATF_REQUIRE(buf != MAP_FAILED);
283 * The duplicate mlock call is added to ensure that the call works
284 * as described above without MAP_WIRED support.
286 ATF_REQUIRE(mlock(buf, page) == 0);
288 ATF_REQUIRE(mlock(buf, page) == 0);
289 ATF_REQUIRE(munlock(buf, page) == 0);
290 ATF_REQUIRE(munmap(buf, page) == 0);
291 ATF_REQUIRE(munlock(buf, page) != 0);
294 * But it should be impossible to mlock(2) a PROT_NONE mapping.
296 buf = mmap(NULL, page, PROT_NONE, flags, -1, 0);
298 ATF_REQUIRE(buf != MAP_FAILED);
300 ATF_REQUIRE_ERRNO(ENOMEM, mlock(buf, page) != 0);
302 ATF_REQUIRE(mlock(buf, page) != 0);
304 ATF_REQUIRE(munmap(buf, page) == 0);
308 ATF_TC_CLEANUP(mlock_mmap, tc)
311 restore_vm_max_wired();
316 ATF_TC_WITH_CLEANUP(mlock_nested);
318 ATF_TC(mlock_nested);
320 ATF_TC_HEAD(mlock_nested, tc)
322 atf_tc_set_md_var(tc, "descr",
323 "Test that consecutive mlock(2) calls succeed");
325 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
326 atf_tc_set_md_var(tc, "require.user", "root");
330 ATF_TC_BODY(mlock_nested, tc)
332 const size_t maxiter = 100;
336 /* Set max_wired really really high to avoid EAGAIN */
337 set_vm_max_wired(INT_MAX);
341 ATF_REQUIRE(buf != NULL);
343 for (size_t i = 0; i < maxiter; i++)
344 ATF_REQUIRE(mlock(buf, page) == 0);
346 ATF_REQUIRE(munlock(buf, page) == 0);
351 ATF_TC_CLEANUP(mlock_nested, tc)
354 restore_vm_max_wired();
361 page = sysconf(_SC_PAGESIZE);
362 ATF_REQUIRE(page >= 0);
364 ATF_TP_ADD_TC(tp, mlock_clip);
365 ATF_TP_ADD_TC(tp, mlock_err);
366 ATF_TP_ADD_TC(tp, mlock_limits);
367 ATF_TP_ADD_TC(tp, mlock_mmap);
368 ATF_TP_ADD_TC(tp, mlock_nested);
370 return atf_no_error();