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mlock.c
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Editing: mlock.c
/*- * Copyright (c) 2005 Robert N. M. Watson * All rights reserved. * * 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 AUTHOR 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 AUTHOR 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. * * $FreeBSD$ */ #include <sys/types.h> #include <sys/mman.h> #include <err.h> #include <errno.h> #include <pwd.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #define NOBODY "nobody" /* * Simple exercise for the mlock() system call -- confirm that mlock() and * munlock() return success on an anonymously mapped memory page when running * with privilege; confirm that they fail with EPERM when running * unprivileged. */ int main(int argc, char *argv[]) { struct passwd *pwd; int pagesize; char *page; if (geteuid() != 0) errx(-1, "mlock must run as root"); errno = 0; pwd = getpwnam(NOBODY); if (pwd == NULL && errno == 0) errx(-1, "getpwnam: user \"%s\" not found", NOBODY); if (pwd == NULL) errx(-1, "getpwnam: %s", strerror(errno)); if (pwd->pw_uid == 0) errx(-1, "getpwnam: user \"%s\" has uid 0", NOBODY); pagesize = getpagesize(); page = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0); if (page == MAP_FAILED) errx(-1, "mmap: %s", strerror(errno)); if (mlock(page, pagesize) < 0) errx(-1, "mlock privileged: %s", strerror(errno)); if (munlock(page, pagesize) < 0) errx(-1, "munlock privileged: %s", strerror(errno)); if (seteuid(pwd->pw_uid) < 0) errx(-1, "seteuid: %s", strerror(errno)); if (mlock(page, pagesize) == 0) errx(-1, "mlock unprivileged: succeeded but shouldn't have"); if (errno != EPERM) errx(-1, "mlock unprivileged: %s", strerror(errno)); if (munlock(page, pagesize) == 0) errx(-1, "munlock unprivileged: succeeded but shouldn't have"); if (errno != EPERM) errx(-1, "munlock unprivileged: %s", strerror(errno)); return (0); }
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