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ba54076e2e
freebsd/sbin/swapon/swapon.c
Jilles Tjoelker 1fdb18b01f swapon: Fix buffer overflow when configuring encrypted swap on GBDE. 
PR:		bin/184950
Tested by:	Radim Kolar
MFC after:	3 days
2013-12-21 11:59:58 +00:00

859 lines
20 KiB
C
Raw Blame History

/*-
* Copyright (c) 1980, 1993
* The Regents of the University of California. 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#if 0
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)swapon.c 8.1 (Berkeley) 6/5/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/mdioctl.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <vm/vm_param.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <fstab.h>
#include <libgen.h>
#include <libutil.h>
#include <limits.h>
#include <paths.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void usage(void);
static const char *swap_on_off(const char *, int, char *);
static const char *swap_on_off_gbde(const char *, int);
static const char *swap_on_off_geli(const char *, char *, int);
static const char *swap_on_off_md(const char *, char *, int);
static const char *swap_on_off_sfile(const char *, int);
static void swaplist(int, int, int);
static int run_cmd(int *, const char *, ...) __printflike(2, 3);
static enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL;
static int qflag;
int
main(int argc, char **argv)
{
struct fstab *fsp;
const char *swfile;
char *ptr;
int ret, ch, doall;
int sflag, lflag, late, hflag;
const char *etc_fstab;
sflag = lflag = late = hflag = 0;
if ((ptr = strrchr(argv[0], '/')) == NULL)
ptr = argv[0];
if (strstr(ptr, "swapon") != NULL)
which_prog = SWAPON;
else if (strstr(ptr, "swapoff") != NULL)
which_prog = SWAPOFF;
orig_prog = which_prog;
doall = 0;
etc_fstab = NULL;
while ((ch = getopt(argc, argv, "AadghklLmqsUF:")) != -1) {
switch(ch) {
case 'A':
if (which_prog == SWAPCTL) {
doall = 1;
which_prog = SWAPON;
} else
usage();
break;
case 'a':
if (which_prog == SWAPON || which_prog == SWAPOFF)
doall = 1;
else
which_prog = SWAPON;
break;
case 'd':
if (which_prog == SWAPCTL)
which_prog = SWAPOFF;
else
usage();
break;
case 'g':
hflag = 'G';
break;
case 'h':
hflag = 'H';
break;
case 'k':
hflag = 'K';
break;
case 'l':
lflag = 1;
break;
case 'L':
late = 1;
break;
case 'm':
hflag = 'M';
break;
case 'q':
if (which_prog == SWAPON || which_prog == SWAPOFF)
qflag = 1;
break;
case 's':
sflag = 1;
break;
case 'U':
if (which_prog == SWAPCTL) {
doall = 1;
which_prog = SWAPOFF;
} else
usage();
break;
case 'F':
etc_fstab = optarg;
break;
case '?':
default:
usage();
}
}
argv += optind;
ret = 0;
swfile = NULL;
if (etc_fstab != NULL)
setfstab(etc_fstab);
if (which_prog == SWAPON || which_prog == SWAPOFF) {
if (doall) {
while ((fsp = getfsent()) != NULL) {
if (strcmp(fsp->fs_type, FSTAB_SW) != 0)
continue;
if (strstr(fsp->fs_mntops, "noauto") != NULL)
continue;
/*
* Forcibly enable "late" option when file= is
* specified. This is because mounting file
* systems with rw option is typically
* required to make the backing store ready.
*/
if (which_prog != SWAPOFF &&
(strstr(fsp->fs_mntops, "late") != NULL ||
strstr(fsp->fs_mntops, "file=") != NULL) &&
late == 0)
continue;
swfile = swap_on_off(fsp->fs_spec, 1,
fsp->fs_mntops);
if (swfile == NULL) {
ret = 1;
continue;
}
if (qflag == 0) {
printf("%s: %sing %s as swap device\n",
getprogname(),
(which_prog == SWAPOFF) ?
"remov" : "add", swfile);
}
}
} else if (*argv == NULL)
usage();
for (; *argv; ++argv) {
swfile = swap_on_off(*argv, 0, NULL);
if (swfile == NULL) {
ret = 1;
continue;
}
if (orig_prog == SWAPCTL) {
printf("%s: %sing %s as swap device\n",
getprogname(),
(which_prog == SWAPOFF) ? "remov" : "add",
swfile);
}
}
} else {
if (lflag || sflag)
swaplist(lflag, sflag, hflag);
else
usage();
}
exit(ret);
}
static const char *
swap_on_off(const char *name, int doingall, char *mntops)
{
char base[PATH_MAX];
/* Swap on vnode-backed md(4) device. */
if (mntops != NULL &&
(fnmatch(_PATH_DEV MD_NAME "[0-9]*", name, 0) == 0 ||
fnmatch(MD_NAME "[0-9]*", name, 0) == 0 ||
strncmp(_PATH_DEV MD_NAME, name,
sizeof(_PATH_DEV) + sizeof(MD_NAME)) == 0 ||
strncmp(MD_NAME, name, sizeof(MD_NAME)) == 0))
return (swap_on_off_md(name, mntops, doingall));
basename_r(name, base);
/* Swap on encrypted device by GEOM_BDE. */
if (fnmatch("*.bde", base, 0) == 0)
return (swap_on_off_gbde(name, doingall));
/* Swap on encrypted device by GEOM_ELI. */
if (fnmatch("*.eli", base, 0) == 0)
return (swap_on_off_geli(name, mntops, doingall));
/* Swap on special file. */
return (swap_on_off_sfile(name, doingall));
}
/* Strip off .bde or .eli suffix from swap device name */
static char *
swap_basename(const char *name)
{
char *dname, *p;
dname = strdup(name);
p = strrchr(dname, '.');
/* assert(p != NULL); */
*p = '\0';
return (dname);
}
static const char *
swap_on_off_gbde(const char *name, int doingall)
{
const char *ret;
char pass[64 * 2 + 1];
unsigned char bpass[64];
char *dname;
int i, error;
dname = swap_basename(name);
if (dname == NULL)
return (NULL);
if (which_prog == SWAPON) {
arc4random_buf(bpass, sizeof(bpass));
for (i = 0; i < (int)sizeof(bpass); i++)
sprintf(&pass[2 * i], "%02x", bpass[i]);
pass[sizeof(pass) - 1] = '\0';
error = run_cmd(NULL, "%s init %s -P %s", _PATH_GBDE,
dname, pass);
if (error) {
/* bde device found. Ignore it. */
free(dname);
if (qflag == 0)
warnx("%s: Device already in use", name);
return (NULL);
}
error = run_cmd(NULL, "%s attach %s -p %s", _PATH_GBDE,
dname, pass);
free(dname);
if (error) {
warnx("gbde (attach) error: %s", name);
return (NULL);
}
}
ret = swap_on_off_sfile(name, doingall);
if (which_prog == SWAPOFF) {
error = run_cmd(NULL, "%s detach %s", _PATH_GBDE, dname);
free(dname);
if (error) {
/* bde device not found. Ignore it. */
if (qflag == 0)
warnx("%s: Device not found", name);
return (NULL);
}
}
return (ret);
}
/* Build geli(8) arguments from mntops */
static char *
swap_on_geli_args(const char *mntops)
{
const char *aalgo, *ealgo, *keylen_str, *sectorsize_str;
const char *aflag, *eflag, *lflag, *sflag;
char *p, *args, *token, *string, *ops;
int argsize, pagesize;
size_t pagesize_len;
u_long ul;
/* Use built-in defaults for geli(8). */
aalgo = ealgo = keylen_str = "";
aflag = eflag = lflag = "";
/* We will always specify sectorsize. */
sflag = " -s ";
sectorsize_str = NULL;
if (mntops != NULL) {
string = ops = strdup(mntops);
while ((token = strsep(&string, ",")) != NULL) {
if ((p = strstr(token, "aalgo=")) == token) {
aalgo = p + sizeof("aalgo=") - 1;
aflag = " -a ";
} else if ((p = strstr(token, "ealgo=")) == token) {
ealgo = p + sizeof("ealgo=") - 1;
eflag = " -e ";
} else if ((p = strstr(token, "keylen=")) == token) {
keylen_str = p + sizeof("keylen=") - 1;
errno = 0;
ul = strtoul(keylen_str, &p, 10);
if (errno == 0) {
if (*p != '\0' || ul > INT_MAX)
errno = EINVAL;
}
if (errno) {
warn("Invalid keylen: %s", keylen_str);
free(ops);
return (NULL);
}
lflag = " -l ";
} else if ((p = strstr(token, "sectorsize=")) == token) {
sectorsize_str = p + sizeof("sectorsize=") - 1;
errno = 0;
ul = strtoul(sectorsize_str, &p, 10);
if (errno == 0) {
if (*p != '\0' || ul > INT_MAX)
errno = EINVAL;
}
if (errno) {
warn("Invalid sectorsize: %s",
sectorsize_str);
free(ops);
return (NULL);
}
} else if (strcmp(token, "sw") != 0) {
warnx("Invalid option: %s", token);
free(ops);
return (NULL);
}
}
} else
ops = NULL;
/*
* If we do not have a sector size at this point, fill in
* pagesize as sector size.
*/
if (sectorsize_str == NULL) {
/* Use pagesize as default sectorsize. */
pagesize = getpagesize();
pagesize_len = snprintf(NULL, 0, "%d", pagesize) + 1;
p = alloca(pagesize_len);
snprintf(p, pagesize_len, "%d", pagesize);
sectorsize_str = p;
}
argsize = asprintf(&args, "%s%s%s%s%s%s%s%s -d",
aflag, aalgo, eflag, ealgo, lflag, keylen_str,
sflag, sectorsize_str);
free(ops);
return (args);
}
static const char *
swap_on_off_geli(const char *name, char *mntops, int doingall)
{
struct stat sb;
char *dname, *args;
int error;
error = stat(name, &sb);
if (which_prog == SWAPON) do {
/* Skip if the .eli device already exists. */
if (error == 0)
break;
args = swap_on_geli_args(mntops);
if (args == NULL)
return (NULL);
dname = swap_basename(name);
if (dname == NULL) {
free(args);
return (NULL);
}
error = run_cmd(NULL, "%s onetime%s %s", _PATH_GELI, args,
dname);
free(dname);
free(args);
if (error) {
/* error occured during creation. */
if (qflag == 0)
warnx("%s: Invalid parameters", name);
return (NULL);
}
} while (0);
return (swap_on_off_sfile(name, doingall));
}
static const char *
swap_on_off_md(const char *name, char *mntops, int doingall)
{
FILE *sfd;
int fd, mdunit, error;
const char *ret;
static char mdpath[PATH_MAX], linebuf[PATH_MAX];
char *p, *vnodefile;
size_t linelen;
u_long ul;
fd = -1;
sfd = NULL;
if (strlen(name) == (sizeof(MD_NAME) - 1))
mdunit = -1;
else {
errno = 0;
ul = strtoul(name + 2, &p, 10);
if (errno == 0) {
if (*p != '\0' || ul > INT_MAX)
errno = EINVAL;
}
if (errno) {
warn("Bad device unit: %s", name);
return (NULL);
}
mdunit = (int)ul;
}
vnodefile = NULL;
if ((p = strstr(mntops, "file=")) != NULL) {
vnodefile = strdup(p + sizeof("file=") - 1);
p = strchr(vnodefile, ',');
if (p != NULL)
*p = '\0';
}
if (vnodefile == NULL) {
warnx("file option not found for %s", name);
return (NULL);
}
if (which_prog == SWAPON) {
if (mdunit == -1) {
error = run_cmd(&fd, "%s -l -n -f %s",
_PATH_MDCONFIG, vnodefile);
if (error == 0) {
/* md device found. Ignore it. */
close(fd);
if (!qflag)
warnx("%s: Device already in use",
vnodefile);
free(vnodefile);
return (NULL);
}
error = run_cmd(&fd, "%s -a -t vnode -n -f %s",
_PATH_MDCONFIG, vnodefile);
if (error) {
warnx("mdconfig (attach) error: file=%s",
vnodefile);
free(vnodefile);
return (NULL);
}
sfd = fdopen(fd, "r");
if (sfd == NULL) {
warn("mdconfig (attach) fdopen error");
ret = NULL;
goto err;
}
p = fgetln(sfd, &linelen);
if (p == NULL &&
(linelen < 2 || linelen > sizeof(linebuf))) {
warn("mdconfig (attach) unexpected output");
ret = NULL;
goto err;
}
strncpy(linebuf, p, linelen);
linebuf[linelen - 1] = '\0';
errno = 0;
ul = strtoul(linebuf, &p, 10);
if (errno == 0) {
if (*p != '\0' || ul > INT_MAX)
errno = EINVAL;
}
if (errno) {
warn("mdconfig (attach) unexpected output: %s",
linebuf);
ret = NULL;
goto err;
}
mdunit = (int)ul;
} else {
error = run_cmd(&fd, "%s -l -n -f %s -u %d",
_PATH_MDCONFIG, vnodefile, mdunit);
if (error == 0) {
/* md device found. Ignore it. */
close(fd);
if (qflag == 0)
warnx("md%d on %s: Device already "
"in use", mdunit, vnodefile);
free(vnodefile);
return (NULL);
}
error = run_cmd(NULL, "%s -a -t vnode -u %d -f %s",
_PATH_MDCONFIG, mdunit, vnodefile);
if (error) {
warnx("mdconfig (attach) error: "
"md%d on file=%s", mdunit, vnodefile);
free(vnodefile);
return (NULL);
}
}
} else /* SWAPOFF */ {
if (mdunit == -1) {
error = run_cmd(&fd, "%s -l -n -f %s",
_PATH_MDCONFIG, vnodefile);
if (error) {
/* md device not found. Ignore it. */
close(fd);
if (!qflag)
warnx("md on %s: Device not found",
vnodefile);
free(vnodefile);
return (NULL);
}
sfd = fdopen(fd, "r");
if (sfd == NULL) {
warn("mdconfig (list) fdopen error");
ret = NULL;
goto err;
}
p = fgetln(sfd, &linelen);
if (p == NULL &&
(linelen < 2 || linelen > sizeof(linebuf) - 1)) {
warn("mdconfig (list) unexpected output");
ret = NULL;
goto err;
}
strncpy(linebuf, p, linelen);
linebuf[linelen - 1] = '\0';
p = strchr(linebuf, ' ');
if (p != NULL)
*p = '\0';
errno = 0;
ul = strtoul(linebuf, &p, 10);
if (errno == 0) {
if (*p != '\0' || ul > INT_MAX)
errno = EINVAL;
}
if (errno) {
warn("mdconfig (list) unexpected output: %s",
linebuf);
ret = NULL;
goto err;
}
mdunit = (int)ul;
} else {
error = run_cmd(&fd, "%s -l -n -f %s -u %d",
_PATH_MDCONFIG, vnodefile, mdunit);
if (error) {
/* md device not found. Ignore it. */
close(fd);
if (!qflag)
warnx("md%d on %s: Device not found",
mdunit, vnodefile);
free(vnodefile);
return (NULL);
}
}
}
snprintf(mdpath, sizeof(mdpath), "%s%s%d", _PATH_DEV,
MD_NAME, mdunit);
mdpath[sizeof(mdpath) - 1] = '\0';
ret = swap_on_off_sfile(mdpath, doingall);
if (which_prog == SWAPOFF) {
if (ret != NULL) {
error = run_cmd(NULL, "%s -d -u %d",
_PATH_MDCONFIG, mdunit);
if (error)
warn("mdconfig (detach) detach failed: %s%s%d",
_PATH_DEV, MD_NAME, mdunit);
}
}
err:
if (sfd != NULL)
fclose(sfd);
if (fd != -1)
close(fd);
free(vnodefile);
return (ret);
}
static int
run_cmd(int *ofd, const char *cmdline, ...)
{
va_list ap;
char **argv, **argvp, *cmd, *p;
int argc, pid, status, rv;
int pfd[2], nfd, dup2dn;
va_start(ap, cmdline);
rv = vasprintf(&cmd, cmdline, ap);
if (rv == -1) {
warn("%s", __func__);
return (rv);
}
va_end(ap);
for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++)
argc++;
argv = (char **)malloc(sizeof(*argv) * (argc + 1));
for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;)
if (**argvp != '\0' && (++argvp > &argv[argc])) {
*argvp = NULL;
break;
}
/* The argv array ends up NULL-terminated here. */
#if 0
{
int i;
fprintf(stderr, "DEBUG: running:");
/* Should be equivalent to 'cmd' (before strsep, of course). */
for (i = 0; argv[i] != NULL; i++)
fprintf(stderr, " %s", argv[i]);
fprintf(stderr, "\n");
}
#endif
dup2dn = 1;
if (ofd != NULL) {
if (pipe(&pfd[0]) == -1) {
warn("%s: pipe", __func__);
return (-1);
}
*ofd = pfd[0];
dup2dn = 0;
}
pid = fork();
switch (pid) {
case 0:
/* Child process. */
if (ofd != NULL)
if (dup2(pfd[1], STDOUT_FILENO) < 0)
err(1, "dup2 in %s", __func__);
nfd = open(_PATH_DEVNULL, O_RDWR);
if (nfd == -1)
err(1, "%s: open %s", __func__, _PATH_DEVNULL);
if (dup2(nfd, STDIN_FILENO) < 0)
err(1, "%s: dup2", __func__);
if (dup2dn && dup2(nfd, STDOUT_FILENO) < 0)
err(1, "%s: dup2", __func__);
if (dup2(nfd, STDERR_FILENO) < 0)
err(1, "%s: dup2", __func__);
execv(argv[0], argv);
warn("exec: %s", argv[0]);
_exit(-1);
case -1:
err(1, "%s: fork", __func__);
}
free(cmd);
free(argv);
while (waitpid(pid, &status, 0) != pid)
;
return (WEXITSTATUS(status));
}
static const char *
swap_on_off_sfile(const char *name, int doingall)
{
int error;
if (which_prog == SWAPON)
error = swapon(name);
else /* SWAPOFF */
error = swapoff(name);
if (error == -1) {
switch (errno) {
case EBUSY:
if (doingall == 0)
warnx("%s: Device already in use", name);
break;
case EINVAL:
if (which_prog == SWAPON)
warnx("%s: NSWAPDEV limit reached", name);
else if (doingall == 0)
warn("%s", name);
break;
default:
warn("%s", name);
break;
}
return (NULL);
}
return (name);
}
static void
usage(void)
{
fprintf(stderr, "usage: %s ", getprogname());
switch(orig_prog) {
case SWAPON:
case SWAPOFF:
fprintf(stderr, "[-F fstab] -aLq | file ...\n");
break;
case SWAPCTL:
fprintf(stderr, "[-AghklmsU] [-a file ... | -d file ...]\n");
break;
}
exit(1);
}
static void
sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen,
long blocksize)
{
char tmp[16];
if (hflag == 'H') {
humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE,
HN_B | HN_NOSPACE | HN_DECIMAL);
snprintf(buf, bufsize, "%*s", hlen, tmp);
} else
snprintf(buf, bufsize, "%*lld", hlen, val / blocksize);
}
static void
swaplist(int lflag, int sflag, int hflag)
{
size_t mibsize, size;
struct xswdev xsw;
int hlen, mib[16], n, pagesize;
long blocksize;
long long total = 0;
long long used = 0;
long long tmp_total;
long long tmp_used;
char buf[32];
pagesize = getpagesize();
switch(hflag) {
case 'G':
blocksize = 1024 * 1024 * 1024;
strlcpy(buf, "1GB-blocks", sizeof(buf));
hlen = 10;
break;
case 'H':
blocksize = -1;
strlcpy(buf, "Bytes", sizeof(buf));
hlen = 10;
break;
case 'K':
blocksize = 1024;
strlcpy(buf, "1kB-blocks", sizeof(buf));
hlen = 10;
break;
case 'M':
blocksize = 1024 * 1024;
strlcpy(buf, "1MB-blocks", sizeof(buf));
hlen = 10;
break;
default:
getbsize(&hlen, &blocksize);
snprintf(buf, sizeof(buf), "%ld-blocks", blocksize);
break;
}
mibsize = nitems(mib);
if (sysctlnametomib("vm.swap_info", mib, &mibsize) == -1)
err(1, "sysctlnametomib()");
if (lflag) {
printf("%-13s %*s %*s\n",
"Device:",
hlen, buf,
hlen, "Used:");
}
for (n = 0; ; ++n) {
mib[mibsize] = n;
size = sizeof xsw;
if (sysctl(mib, mibsize + 1, &xsw, &size, NULL, 0) == -1)
break;
if (xsw.xsw_version != XSWDEV_VERSION)
errx(1, "xswdev version mismatch");
tmp_total = (long long)xsw.xsw_nblks * pagesize;
tmp_used = (long long)xsw.xsw_used * pagesize;
total += tmp_total;
used += tmp_used;
if (lflag) {
sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen,
blocksize);
printf("/dev/%-8s %s ", devname(xsw.xsw_dev, S_IFCHR),
buf);
sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen,
blocksize);
printf("%s\n", buf);
}
}
if (errno != ENOENT)
err(1, "sysctl()");
if (sflag) {
sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize);
printf("Total: %s ", buf);
sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize);
printf("%s\n", buf);
}
}
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