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[src/trunk]: src Add few unit tests for mlock(2), including a case for PR ker...



details:   https://anonhg.NetBSD.org/src/rev/ff388a678097
branches:  trunk
changeset: 778919:ff388a678097
user:      jruoho <jruoho%NetBSD.org@localhost>
date:      Fri Apr 20 12:11:29 2012 +0000

description:
Add few unit tests for mlock(2), including a case for PR kern/44788.

diffstat:

 distrib/sets/lists/tests/mi  |    4 +-
 tests/lib/libc/sys/Makefile  |    3 +-
 tests/lib/libc/sys/t_mlock.c |  220 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 225 insertions(+), 2 deletions(-)

diffs (266 lines):

diff -r d8667d76c183 -r ff388a678097 distrib/sets/lists/tests/mi
--- a/distrib/sets/lists/tests/mi       Fri Apr 20 05:41:25 2012 +0000
+++ b/distrib/sets/lists/tests/mi       Fri Apr 20 12:11:29 2012 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.465 2012/04/19 18:51:36 jruoho Exp $
+# $NetBSD: mi,v 1.466 2012/04/20 12:11:30 jruoho Exp $
 #
 # Note: don't delete entries from here - mark them as "obsolete" instead.
 #
@@ -549,6 +549,7 @@
 ./usr/libdata/debug/usr/tests/lib/libc/sys/t_mkdir.debug               tests-lib-debug         debug,atf
 ./usr/libdata/debug/usr/tests/lib/libc/sys/t_mkfifo.debug              tests-lib-debug         debug,atf
 ./usr/libdata/debug/usr/tests/lib/libc/sys/t_mknod.debug               tests-lib-debug         debug,atf
+./usr/libdata/debug/usr/tests/lib/libc/sys/t_mlock.debug               tests-lib-debug         debug,atf
 ./usr/libdata/debug/usr/tests/lib/libc/sys/t_mmap.debug                        tests-lib-debug         debug,atf
 ./usr/libdata/debug/usr/tests/lib/libc/sys/t_mprotect.debug            tests-lib-debug         debug,atf
 ./usr/libdata/debug/usr/tests/lib/libc/sys/t_msgctl.debug              tests-lib-debug         debug,atf
@@ -2449,6 +2450,7 @@
 ./usr/tests/lib/libc/sys/t_mkdir               tests-lib-tests         atf
 ./usr/tests/lib/libc/sys/t_mkfifo              tests-lib-tests         atf
 ./usr/tests/lib/libc/sys/t_mknod               tests-lib-tests         atf
+./usr/tests/lib/libc/sys/t_mlock               tests-lib-tests         atf
 ./usr/tests/lib/libc/sys/t_mmap                        tests-lib-tests         atf
 ./usr/tests/lib/libc/sys/t_mprotect            tests-lib-tests         atf
 ./usr/tests/lib/libc/sys/t_msgctl              tests-lib-tests         atf
diff -r d8667d76c183 -r ff388a678097 tests/lib/libc/sys/Makefile
--- a/tests/lib/libc/sys/Makefile       Fri Apr 20 05:41:25 2012 +0000
+++ b/tests/lib/libc/sys/Makefile       Fri Apr 20 12:11:29 2012 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.21 2012/03/17 17:23:34 jruoho Exp $
+# $NetBSD: Makefile,v 1.22 2012/04/20 12:11:29 jruoho Exp $
 
 MKMAN= no
 
@@ -33,6 +33,7 @@
 TESTS_C+=              t_mkdir
 TESTS_C+=              t_mkfifo
 TESTS_C+=              t_mknod
+TESTS_C+=              t_mlock
 TESTS_C+=              t_mmap
 TESTS_C+=              t_mprotect
 TESTS_C+=              t_msgctl
diff -r d8667d76c183 -r ff388a678097 tests/lib/libc/sys/t_mlock.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/lib/libc/sys/t_mlock.c      Fri Apr 20 12:11:29 2012 +0000
@@ -0,0 +1,220 @@
+/* $NetBSD: t_mlock.c,v 1.1 2012/04/20 12:11:29 jruoho Exp $ */
+
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jukka Ruohonen.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_mlock.c,v 1.1 2012/04/20 12:11:29 jruoho Exp $");
+
+#include <sys/mman.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <atf-c.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static long page = 0;
+
+ATF_TC(mlock_clip);
+ATF_TC_HEAD(mlock_clip, tc)
+{
+       atf_tc_set_md_var(tc, "descr", "Test with mlock(2) that UVM only "
+           "clips if the clip address is within the entry (PR kern/44788)");
+}
+
+ATF_TC_BODY(mlock_clip, tc)
+{
+       void *buf;
+
+       buf = malloc(page);
+       ATF_REQUIRE(buf != NULL);
+
+       if (page < 1024)
+               atf_tc_skip("page size too small");
+
+       for (size_t i = page; i >= 1; i = i - 1024) {
+               (void)fprintf(stderr, "trying to lock %zu bytes\n", page - i);
+               (void)mlock(buf, page - i);
+               (void)munlock(buf, page - i);
+       }
+
+       free(buf);
+}
+
+ATF_TC(mlock_err);
+ATF_TC_HEAD(mlock_err, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Test error conditions in mlock(2) and munlock(2)");
+}
+
+ATF_TC_BODY(mlock_err, tc)
+{
+
+       errno = 0;
+       ATF_REQUIRE_ERRNO(ENOMEM, mlock(NULL, page) == -1);
+
+       errno = 0;
+       ATF_REQUIRE_ERRNO(ENOMEM, mlock((char *)0, page) == -1);
+
+       errno = 0;
+       ATF_REQUIRE_ERRNO(EINVAL, mlock((char *)-1, page) == -1);
+
+       errno = 0;
+       ATF_REQUIRE_ERRNO(ENOMEM, munlock(NULL, page) == -1);
+
+       errno = 0;
+       ATF_REQUIRE_ERRNO(ENOMEM, munlock((char *)0, page) == -1);
+
+       errno = 0;
+       ATF_REQUIRE_ERRNO(EINVAL, munlock((char *)-1, page) == -1);
+}
+
+ATF_TC(mlock_limits);
+ATF_TC_HEAD(mlock_limits, tc)
+{
+       atf_tc_set_md_var(tc, "descr", "Test system limits with mlock(2)");
+}
+
+ATF_TC_BODY(mlock_limits, tc)
+{
+       struct rlimit res;
+       void *buf;
+       pid_t pid;
+       int sta;
+
+       buf = malloc(page);
+       ATF_REQUIRE(buf != NULL);
+
+       pid = fork();
+       ATF_REQUIRE(pid >= 0);
+
+       if (pid == 0) {
+
+               for (ssize_t i = page; i >= 2; i -= 100) {
+
+                       res.rlim_cur = i - 1;
+                       res.rlim_max = i - 1;
+
+                       (void)fprintf(stderr, "trying to lock %zd bytes "
+                           "with %zu byte limit\n", i, (size_t)res.rlim_cur);
+
+                       if (setrlimit(RLIMIT_MEMLOCK, &res) != 0)
+                               _exit(EXIT_FAILURE);
+
+                       errno = 0;
+
+                       if (mlock(buf, i) != -1 || errno != EAGAIN) {
+                               (void)munlock(buf, i);
+                               _exit(EXIT_FAILURE);
+                       }
+               }
+
+               _exit(EXIT_SUCCESS);
+       }
+
+       (void)wait(&sta);
+
+       if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
+               atf_tc_fail("mlock(2) locked beyond system limits");
+
+       free(buf);
+}
+
+ATF_TC(mlock_mmap);
+ATF_TC_HEAD(mlock_mmap, tc)
+{
+       atf_tc_set_md_var(tc, "descr", "Test mlock(2)-mmap(2) interaction");
+}
+
+ATF_TC_BODY(mlock_mmap, tc)
+{
+       static const int flags = MAP_ANON | MAP_PRIVATE | MAP_WIRED;
+       void *buf;
+
+       /*
+        * Make a wired RW mapping and check that mlock(2)
+        * does not fail for the (already locked) mapping.
+        */
+       buf = mmap(NULL, page, PROT_READ | PROT_WRITE, flags, -1, 0);
+
+       ATF_REQUIRE(buf != MAP_FAILED);
+       ATF_REQUIRE(mlock(buf, page) == 0);
+       ATF_REQUIRE(munlock(buf, page) == 0);
+       ATF_REQUIRE(munmap(buf, page) == 0);
+       ATF_REQUIRE(munlock(buf, page) != 0);
+
+       /*
+        * But it should be impossible to mlock(2) a PROT_NONE mapping.
+        */
+       buf = mmap(NULL, page, PROT_NONE, flags, -1, 0);
+
+       ATF_REQUIRE(buf != MAP_FAILED);
+       ATF_REQUIRE(mlock(buf, page) != 0);
+       ATF_REQUIRE(munmap(buf, page) == 0);
+}
+
+ATF_TC(mlock_nested);
+ATF_TC_HEAD(mlock_nested, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Test that consecutive mlock(2) calls succeed");
+}
+
+ATF_TC_BODY(mlock_nested, tc)
+{
+       const size_t maxiter = 100;
+       void *buf;
+
+       buf = malloc(page);
+       ATF_REQUIRE(buf != NULL);
+
+       for (size_t i = 0; i < maxiter; i++)
+               ATF_REQUIRE(mlock(buf, page) == 0);
+
+       ATF_REQUIRE(munlock(buf, page) == 0);
+       free(buf);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+       page = sysconf(_SC_PAGESIZE);
+       ATF_REQUIRE(page >= 0);
+
+       ATF_TP_ADD_TC(tp, mlock_clip);
+       ATF_TP_ADD_TC(tp, mlock_err);
+       ATF_TP_ADD_TC(tp, mlock_limits);
+       ATF_TP_ADD_TC(tp, mlock_mmap);
+       ATF_TP_ADD_TC(tp, mlock_nested);
+
+       return atf_no_error();
+}



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