Add a few regression tests for mlock(2).
These are intended to exercise some rarely executed code paths. MFC after: 2 weeks
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@ -4,6 +4,7 @@ PACKAGE= tests
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TESTSDIR= ${TESTSBASE}/sys/vm
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ATF_TESTS_C+= mmap_test
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ATF_TESTS_C+= mlock_test \
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mmap_test
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.include <bsd.test.mk>
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174
tests/sys/vm/mlock_test.c
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174
tests/sys/vm/mlock_test.c
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@ -0,0 +1,174 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Mark Johnston <markj@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/mman.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <atf-c.h>
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static void
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test_wired_copy_on_write(void *addr, size_t len)
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{
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int status, val;
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pid_t pid;
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pid = fork();
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if (pid == -1)
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atf_tc_fail("fork() failed: %s", strerror(errno));
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if (pid == 0) {
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if (mlock(addr, len) != 0)
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_exit(1);
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if (ptrace(PT_TRACE_ME, 0, NULL, 0) != 0)
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_exit(2);
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if (raise(SIGSTOP) != 0)
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_exit(3);
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if (munlock(addr, len) != 0)
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_exit(4);
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_exit(0);
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}
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ATF_REQUIRE(waitpid(pid, &status, 0) == pid);
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ATF_REQUIRE_MSG(!WIFEXITED(status),
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"child exited with status %d", WEXITSTATUS(status));
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ATF_REQUIRE(WIFSTOPPED(status));
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ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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errno = 0;
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val = ptrace(PT_READ_D, pid, addr, 0);
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ATF_REQUIRE(errno == 0);
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ATF_REQUIRE(ptrace(PT_WRITE_D, pid, addr, val) == 0);
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ATF_REQUIRE(ptrace(PT_CONTINUE, pid, (caddr_t)1, 0) == 0);
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ATF_REQUIRE(waitpid(pid, &status, 0) == pid);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE_MSG(WEXITSTATUS(status) == 0,
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"child exited with status %d", WSTOPSIG(status));
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}
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/*
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* Use ptrace(2) to trigger a copy-on-write fault of anonymous memory.
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*/
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ATF_TC_WITHOUT_HEAD(mlock__copy_on_write_anon);
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ATF_TC_BODY(mlock__copy_on_write_anon, tc)
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{
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char *addr;
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int len;
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len = getpagesize();
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addr = mmap(NULL, len, PROT_READ, MAP_ANON, -1, 0);
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ATF_REQUIRE(addr != MAP_FAILED);
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test_wired_copy_on_write(addr, len);
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}
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/*
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* Use ptrace(2) to trigger a copy-on-write fault of a read-only text page.
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*/
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ATF_TC_WITHOUT_HEAD(mlock__copy_on_write_vnode);
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ATF_TC_BODY(mlock__copy_on_write_vnode, tc)
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{
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void *addr;
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int len;
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len = getpagesize();
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addr = (void *)((uintptr_t)test_wired_copy_on_write & ~(len - 1));
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test_wired_copy_on_write(addr, len);
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}
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/*
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* Try truncating and then resizing an mlock()ed mapping.
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*/
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ATF_TC_WITHOUT_HEAD(mlock__truncate_and_resize);
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ATF_TC_BODY(mlock__truncate_and_resize, tc)
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{
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char filename[16];
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char *addr;
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int fd, i, len;
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snprintf(filename, sizeof(filename), "tmp.XXXXXX");
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fd = mkstemp(filename);
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ATF_REQUIRE(fd >= 0);
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ATF_REQUIRE(unlink(filename) == 0);
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len = getpagesize();
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ATF_REQUIRE(ftruncate(fd, len) == 0);
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addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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ATF_REQUIRE(addr != MAP_FAILED);
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ATF_REQUIRE(mlock(addr, len) == 0);
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memset(addr, 1, len);
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ATF_REQUIRE(ftruncate(fd, 0) == 0);
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ATF_REQUIRE(ftruncate(fd, len) == 0);
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for (i = 0; i < len; i++)
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ATF_REQUIRE(addr[i] == 0);
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ATF_REQUIRE(munlock(addr, len) == 0);
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}
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/*
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* Make sure that we can munlock() a truncated mapping.
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*/
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ATF_TC_WITHOUT_HEAD(mlock__truncate_and_unlock);
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ATF_TC_BODY(mlock__truncate_and_unlock, tc)
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{
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char filename[16];
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void *addr;
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int fd, len;
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snprintf(filename, sizeof(filename), "tmp.XXXXXX");
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fd = mkstemp(filename);
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ATF_REQUIRE(fd >= 0);
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ATF_REQUIRE(unlink(filename) == 0);
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len = getpagesize();
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ATF_REQUIRE(ftruncate(fd, len) == 0);
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addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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ATF_REQUIRE(addr != MAP_FAILED);
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ATF_REQUIRE(mlock(addr, len) == 0);
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ATF_REQUIRE(ftruncate(fd, 0) == 0);
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ATF_REQUIRE(munlock(addr, len) == 0);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, mlock__copy_on_write_anon);
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ATF_TP_ADD_TC(tp, mlock__copy_on_write_vnode);
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ATF_TP_ADD_TC(tp, mlock__truncate_and_resize);
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ATF_TP_ADD_TC(tp, mlock__truncate_and_unlock);
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return (atf_no_error());
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}
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