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a11bf9a49b
freebsd/sbin/fsck_ffs/main.c
Kirk McKusick 0061238fb0 This update eliminates a kernel stack disclosure bug in UFS/FFS 
directory entries that is caused by uninitialized directory entry
padding written to the disk. It can be viewed by any user with read
access to that directory. Up to 3 bytes of kernel stack are disclosed
per file entry, depending on the the amount of padding the kernel
needs to pad out the entry to a 32 bit boundry. The offset in the
kernel stack that is disclosed is a function of the filename size.
Furthermore, if the user can create files in a directory, this 3
byte window can be expanded 3 bytes at a time to a 254 byte window
with 75% of the data in that window exposed. The additional exposure
is done by removing the entry, creating a new entry with a 4-byte
longer name, extracting 3 more bytes by reading the directory, and
repeating until a 252 byte name is created.

This exploit works in part because the area of the kernel stack
that is being disclosed is in an area that typically doesn't change
that often (perhaps a few times a second on a lightly loaded system),
and these file creates and unlinks themselves don't overwrite the
area of kernel stack being disclosed.

It appears that this bug originated with the creation of the Fast
File System in 4.1b-BSD (Circa 1982, more than 36 years ago!), and
is likely present in every Unix or Unix-like system that uses
UFS/FFS. Amazingly, nobody noticed until now.

This update also adds the -z flag to fsck_ffs to have it scrub
the leaked information in the name padding of existing directories.
It only needs to be run once on each UFS/FFS filesystem after a
patched kernel is installed and running.

Submitted by: David G. Lawrence <dg@dglawrence.com>
Reviewed by:  kib
MFC after:    1 week
2019-05-03 21:54:14 +00:00

755 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1980, 1986, 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.
* 3. 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, 1986, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/14/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define IN_RTLD /* So we pickup the P_OSREL defines */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/disklabel.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <grp.h>
#include <inttypes.h>
#include <mntopts.h>
#include <paths.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include "fsck.h"
int restarts;
static void usage(void) __dead2;
static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
static int checkfilesys(char *filesys);
static int chkdoreload(struct statfs *mntp);
static struct statfs *getmntpt(const char *);
int
main(int argc, char *argv[])
{
int ch;
struct rlimit rlimit;
struct itimerval itimerval;
int fsret;
int ret = 0;
sync();
skipclean = 1;
inoopt = 0;
while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) {
switch (ch) {
case 'b':
skipclean = 0;
bflag = argtoimax('b', "number", optarg, 10);
printf("Alternate super block location: %jd\n", bflag);
break;
case 'B':
bkgrdflag = 1;
break;
case 'c':
skipclean = 0;
cvtlevel = argtoimax('c', "conversion level", optarg,
10);
if (cvtlevel < 3)
errx(EEXIT, "cannot do level %d conversion",
cvtlevel);
break;
case 'd':
debug++;
break;
case 'E':
Eflag++;
break;
case 'f':
skipclean = 0;
break;
case 'F':
bkgrdcheck = 1;
break;
case 'm':
lfmode = argtoimax('m', "mode", optarg, 8);
if (lfmode &~ 07777)
errx(EEXIT, "bad mode to -m: %o", lfmode);
printf("** lost+found creation mode %o\n", lfmode);
break;
case 'n':
nflag++;
yflag = 0;
break;
case 'p':
preen++;
/*FALLTHROUGH*/
case 'C':
ckclean++;
break;
case 'R':
wantrestart = 1;
break;
case 'r':
inoopt++;
break;
case 'S':
surrender = 1;
break;
case 'y':
yflag++;
nflag = 0;
break;
case 'Z':
Zflag++;
break;
case 'z':
zflag++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (!argc)
usage();
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
(void)signal(SIGINT, catch);
if (ckclean)
(void)signal(SIGQUIT, catchquit);
signal(SIGINFO, infohandler);
if (bkgrdflag) {
signal(SIGALRM, alarmhandler);
itimerval.it_interval.tv_sec = 5;
itimerval.it_interval.tv_usec = 0;
itimerval.it_value.tv_sec = 5;
itimerval.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &itimerval, NULL);
}
/*
* Push up our allowed memory limit so we can cope
* with huge file systems.
*/
if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
rlimit.rlim_cur = rlimit.rlim_max;
(void)setrlimit(RLIMIT_DATA, &rlimit);
}
while (argc > 0) {
if ((fsret = checkfilesys(*argv)) == ERESTART)
continue;
ret |= fsret;
argc--;
argv++;
}
if (returntosingle)
ret = 2;
exit(ret);
}
static intmax_t
argtoimax(int flag, const char *req, const char *str, int base)
{
char *cp;
intmax_t ret;
ret = strtoimax(str, &cp, base);
if (cp == str || *cp)
errx(EEXIT, "-%c flag requires a %s", flag, req);
return (ret);
}
/*
* Check the specified file system.
*/
/* ARGSUSED */
static int
checkfilesys(char *filesys)
{
ufs2_daddr_t n_ffree, n_bfree;
struct dups *dp;
struct statfs *mntp;
struct stat snapdir;
struct group *grp;
struct iovec *iov;
char errmsg[255];
int ofsmodified;
int iovlen;
int cylno;
intmax_t blks, files;
size_t size;
iov = NULL;
iovlen = 0;
errmsg[0] = '\0';
fsutilinit();
fsckinit();
cdevname = filesys;
if (debug && ckclean)
pwarn("starting\n");
/*
* Make best effort to get the disk name. Check first to see
* if it is listed among the mounted file systems. Failing that
* check to see if it is listed in /etc/fstab.
*/
mntp = getmntpt(filesys);
if (mntp != NULL)
filesys = mntp->f_mntfromname;
else
filesys = blockcheck(filesys);
/*
* If -F flag specified, check to see whether a background check
* is possible and needed. If possible and needed, exit with
* status zero. Otherwise exit with status non-zero. A non-zero
* exit status will cause a foreground check to be run.
*/
sblock_init();
if (bkgrdcheck) {
if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
exit(3); /* Cannot read superblock */
close(fsreadfd);
/* Earlier background failed or journaled */
if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
exit(4);
if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
exit(5); /* Not running soft updates */
size = MIBSIZE;
if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
exit(6); /* Lacks kernel support */
if ((mntp == NULL && sblock.fs_clean == 1) ||
(mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
exit(7); /* Filesystem clean, report it now */
exit(0);
}
if (ckclean && skipclean) {
/*
* If file system is gjournaled, check it here.
*/
if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
exit(3); /* Cannot read superblock */
close(fsreadfd);
if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
//printf("GJournaled file system detected on %s.\n",
// filesys);
if (sblock.fs_clean == 1) {
pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
exit(0);
}
if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
gjournal_check(filesys);
if (chkdoreload(mntp) == 0)
exit(0);
exit(4);
} else {
pfatal(
"UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
}
}
}
/*
* If we are to do a background check:
* Get the mount point information of the file system
* create snapshot file
* return created snapshot file
* if not found, clear bkgrdflag and proceed with normal fsck
*/
if (bkgrdflag) {
if (mntp == NULL) {
bkgrdflag = 0;
pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
} else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
bkgrdflag = 0;
pfatal(
"NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
} else if ((mntp->f_flags & MNT_RDONLY) != 0) {
bkgrdflag = 0;
pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
} else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
if (readsb(0) != 0) {
if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
bkgrdflag = 0;
pfatal(
"UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
}
if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
skipclean && ckclean) {
/*
* file system is clean;
* skip snapshot and report it clean
*/
pwarn(
"FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
goto clean;
}
}
close(fsreadfd);
}
if (bkgrdflag) {
snprintf(snapname, sizeof snapname, "%s/.snap",
mntp->f_mntonname);
if (stat(snapname, &snapdir) < 0) {
if (errno != ENOENT) {
bkgrdflag = 0;
pfatal(
"CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
snapname, strerror(errno));
} else if ((grp = getgrnam("operator")) == NULL ||
mkdir(snapname, 0770) < 0 ||
chown(snapname, -1, grp->gr_gid) < 0 ||
chmod(snapname, 0770) < 0) {
bkgrdflag = 0;
pfatal(
"CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
snapname, strerror(errno));
}
} else if (!S_ISDIR(snapdir.st_mode)) {
bkgrdflag = 0;
pfatal(
"%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
snapname);
}
}
if (bkgrdflag) {
snprintf(snapname, sizeof snapname,
"%s/.snap/fsck_snapshot", mntp->f_mntonname);
build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
build_iovec(&iov, &iovlen, "from", snapname,
(size_t)-1);
build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
(size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg,
sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
while (nmount(iov, iovlen, mntp->f_flags) < 0) {
if (errno == EEXIST && unlink(snapname) == 0)
continue;
bkgrdflag = 0;
pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
snapname, strerror(errno), errmsg);
break;
}
if (bkgrdflag != 0)
filesys = snapname;
}
}
switch (setup(filesys)) {
case 0:
if (preen)
pfatal("CAN'T CHECK FILE SYSTEM.");
return (0);
case -1:
clean:
pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
(intmax_t)sblock.fs_cstotal.cs_nffree,
(intmax_t)sblock.fs_cstotal.cs_nbfree,
sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
return (0);
}
/*
* Determine if we can and should do journal recovery.
*/
if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
if (preen || reply("USE JOURNAL")) {
if (suj_check(filesys) == 0) {
printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
if (chkdoreload(mntp) == 0)
exit(0);
exit(4);
}
}
printf("** Skipping journal, falling through to full fsck\n\n");
}
/*
* Write the superblock so we don't try to recover the
* journal on another pass. If this is the only change
* to the filesystem, we do not want it to be called
* out as modified.
*/
sblock.fs_mtime = time(NULL);
sbdirty();
ofsmodified = fsmodified;
flush(fswritefd, &sblk);
fsmodified = ofsmodified;
}
/*
* If the filesystem was run on an old kernel that did not
* support check hashes, clear the check-hash flags so that
* we do not try to verify them.
*/
if ((sblock.fs_flags & FS_METACKHASH) == 0)
sblock.fs_metackhash = 0;
/*
* If we are running on a kernel that can provide check hashes
* that are not yet enabled for the filesystem and we are
* running manually without the -y flag, offer to add any
* supported check hashes that are not already enabled.
*/
ckhashadd = 0;
if (preen == 0 && yflag == 0 && sblock.fs_magic != FS_UFS1_MAGIC &&
fswritefd != -1 && getosreldate() >= P_OSREL_CK_CYLGRP) {
if ((sblock.fs_metackhash & CK_CYLGRP) == 0 &&
reply("ADD CYLINDER GROUP CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_CYLGRP;
sblock.fs_metackhash |= CK_CYLGRP;
}
if ((sblock.fs_metackhash & CK_SUPERBLOCK) == 0 &&
getosreldate() >= P_OSREL_CK_SUPERBLOCK &&
reply("ADD SUPERBLOCK CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_SUPERBLOCK;
sblock.fs_metackhash |= CK_SUPERBLOCK;
}
if ((sblock.fs_metackhash & CK_INODE) == 0 &&
getosreldate() >= P_OSREL_CK_INODE &&
reply("ADD INODE CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_INODE;
sblock.fs_metackhash |= CK_INODE;
}
#ifdef notyet
if ((sblock.fs_metackhash & CK_INDIR) == 0 &&
getosreldate() >= P_OSREL_CK_INDIR &&
reply("ADD INDIRECT BLOCK CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_INDIR;
sblock.fs_metackhash |= CK_INDIR;
}
if ((sblock.fs_metackhash & CK_DIR) == 0 &&
getosreldate() >= P_OSREL_CK_DIR &&
reply("ADD DIRECTORY CHECK-HASH PROTECTION") != 0) {
ckhashadd |= CK_DIR;
sblock.fs_metackhash |= CK_DIR;
}
#endif /* notyet */
if (ckhashadd != 0) {
sblock.fs_flags |= FS_METACKHASH;
sbdirty();
}
}
/*
* Cleared if any questions answered no. Used to decide if
* the superblock should be marked clean.
*/
resolved = 1;
/*
* 1: scan inodes tallying blocks used
*/
if (preen == 0) {
printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
printf("** Root file system\n");
printf("** Phase 1 - Check Blocks and Sizes\n");
}
clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
pass1();
IOstats("Pass1");
/*
* 1b: locate first references to duplicates, if any
*/
if (duplist) {
if (preen || usedsoftdep)
pfatal("INTERNAL ERROR: dups with %s%s%s",
preen ? "-p" : "",
(preen && usedsoftdep) ? " and " : "",
usedsoftdep ? "softupdates" : "");
printf("** Phase 1b - Rescan For More DUPS\n");
pass1b();
IOstats("Pass1b");
}
/*
* 2: traverse directories from root to mark all connected directories
*/
if (preen == 0)
printf("** Phase 2 - Check Pathnames\n");
pass2();
IOstats("Pass2");
/*
* 3: scan inodes looking for disconnected directories
*/
if (preen == 0)
printf("** Phase 3 - Check Connectivity\n");
pass3();
IOstats("Pass3");
/*
* 4: scan inodes looking for disconnected files; check reference counts
*/
if (preen == 0)
printf("** Phase 4 - Check Reference Counts\n");
pass4();
IOstats("Pass4");
/*
* 5: check and repair resource counts in cylinder groups
*/
if (preen == 0)
printf("** Phase 5 - Check Cyl groups\n");
pass5();
IOstats("Pass5");
/*
* print out summary statistics
*/
n_ffree = sblock.fs_cstotal.cs_nffree;
n_bfree = sblock.fs_cstotal.cs_nbfree;
files = maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
blks = n_blks +
sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
if (bkgrdflag && (files > 0 || blks > 0)) {
countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
countdirs, files - countdirs, blks);
}
pwarn("%ld files, %jd used, %ju free ",
(long)n_files, (intmax_t)n_blks,
(uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
(uintmax_t)n_ffree, (uintmax_t)n_bfree,
n_ffree * 100.0 / sblock.fs_dsize);
if (debug) {
if (files < 0)
printf("%jd inodes missing\n", -files);
if (blks < 0)
printf("%jd blocks missing\n", -blks);
if (duplist != NULL) {
printf("The following duplicate blocks remain:");
for (dp = duplist; dp; dp = dp->next)
printf(" %jd,", (intmax_t)dp->dup);
printf("\n");
}
}
duplist = (struct dups *)0;
muldup = (struct dups *)0;
inocleanup();
if (fsmodified) {
sblock.fs_time = time(NULL);
sbdirty();
}
if (cvtlevel && sblk.b_dirty) {
/*
* Write out the duplicate super blocks
*/
for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
blwrite(fswritefd, (char *)&sblock,
fsbtodb(&sblock, cgsblock(&sblock, cylno)),
SBLOCKSIZE);
}
if (rerun)
resolved = 0;
finalIOstats();
/*
* Check to see if the file system is mounted read-write.
*/
if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
resolved = 0;
ckfini(resolved);
for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
if (inostathead[cylno].il_stat != NULL)
free((char *)inostathead[cylno].il_stat);
free((char *)inostathead);
inostathead = NULL;
if (fsmodified && !preen)
printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
if (rerun) {
if (wantrestart && (restarts++ < 10) &&
(preen || reply("RESTART")))
return (ERESTART);
printf("\n***** PLEASE RERUN FSCK *****\n");
}
if (chkdoreload(mntp) != 0) {
if (!fsmodified)
return (0);
if (!preen)
printf("\n***** REBOOT NOW *****\n");
sync();
return (4);
}
return (rerun ? ERERUN : 0);
}
static int
chkdoreload(struct statfs *mntp)
{
struct iovec *iov;
int iovlen;
char errmsg[255];
if (mntp == NULL)
return (0);
iov = NULL;
iovlen = 0;
errmsg[0] = '\0';
/*
* We modified a mounted file system. Do a mount update on
* it unless it is read-write, so we can continue using it
* as safely as possible.
*/
if (mntp->f_flags & MNT_RDONLY) {
build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
(size_t)-1);
build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
(size_t)-1);
build_iovec(&iov, &iovlen, "errmsg", errmsg,
sizeof(errmsg));
build_iovec(&iov, &iovlen, "update", NULL, 0);
build_iovec(&iov, &iovlen, "reload", NULL, 0);
/*
* XX: We need the following line until we clean up
* nmount parsing of root mounts and NFS root mounts.
*/
build_iovec(&iov, &iovlen, "ro", NULL, 0);
if (nmount(iov, iovlen, mntp->f_flags) == 0) {
return (0);
}
pwarn("mount reload of '%s' failed: %s %s\n\n",
mntp->f_mntonname, strerror(errno), errmsg);
return (1);
}
return (0);
}
/*
* Get the mount point information for name.
*/
static struct statfs *
getmntpt(const char *name)
{
struct stat devstat, mntdevstat;
char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
char *ddevname;
struct statfs *mntbuf, *statfsp;
int i, mntsize, isdev;
if (stat(name, &devstat) != 0)
return (NULL);
if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
isdev = 1;
else
isdev = 0;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
statfsp = &mntbuf[i];
ddevname = statfsp->f_mntfromname;
if (*ddevname != '/') {
if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
sizeof(statfsp->f_mntfromname))
continue;
strcpy(device, _PATH_DEV);
strcat(device, ddevname);
strcpy(statfsp->f_mntfromname, device);
}
if (isdev == 0) {
if (strcmp(name, statfsp->f_mntonname))
continue;
return (statfsp);
}
if (stat(ddevname, &mntdevstat) == 0 &&
mntdevstat.st_rdev == devstat.st_rdev)
return (statfsp);
}
statfsp = NULL;
return (statfsp);
}
static void
usage(void)
{
(void) fprintf(stderr,
"usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
getprogname());
exit(1);
}
void
infohandler(int sig __unused)
{
got_siginfo = 1;
}
void
alarmhandler(int sig __unused)
{
got_sigalarm = 1;
}
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