Fix some unsafe signal handlers, and be careful not to overflow on fd_set.
Fix some string buffer operations. Based on: OpenBSD Reviewed by: audit MFC after: 2 weeks
This commit is contained in:
parent
e65cded7f3
commit
dc2bdcbddf
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=82724
@ -282,6 +282,8 @@ int LogFacPri = 0; /* Put facility and priority in log message: */
|
||||
/* 0=no, 1=numeric, 2=names */
|
||||
int KeepKernFac = 0; /* Keep remotely logged kernel facility */
|
||||
|
||||
volatile sig_atomic_t MarkSet, WantDie;
|
||||
|
||||
int allowaddr __P((char *));
|
||||
void cfline __P((char *, struct filed *, char *, char *));
|
||||
char *cvthname __P((struct sockaddr *));
|
||||
@ -289,6 +291,7 @@ void deadq_enter __P((pid_t, const char *));
|
||||
int deadq_remove __P((pid_t));
|
||||
int decode __P((const char *, CODE *));
|
||||
void die __P((int));
|
||||
void dodie __P((int));
|
||||
void domark __P((int));
|
||||
void fprintlog __P((struct filed *, int, char *));
|
||||
int* socksetup __P((int));
|
||||
@ -296,6 +299,7 @@ void init __P((int));
|
||||
void logerror __P((const char *));
|
||||
void logmsg __P((int, char *, char *, int));
|
||||
void log_deadchild __P((pid_t, int, const char *));
|
||||
void markit __P((void));
|
||||
void printline __P((char *, char *));
|
||||
void printsys __P((char *));
|
||||
int p_open __P((char *, pid_t *));
|
||||
@ -314,9 +318,10 @@ main(argc, argv)
|
||||
int argc;
|
||||
char *argv[];
|
||||
{
|
||||
int ch, i, l;
|
||||
int ch, i, fdsrmax = 0, l;
|
||||
struct sockaddr_un sunx, fromunix;
|
||||
struct sockaddr_storage frominet;
|
||||
fd_set *fdsr = NULL;
|
||||
FILE *fp;
|
||||
char *hname, line[MAXLINE + 1];
|
||||
struct timeval tv, *tvp;
|
||||
@ -397,11 +402,12 @@ main(argc, argv)
|
||||
endservent();
|
||||
|
||||
consfile.f_type = F_CONSOLE;
|
||||
(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
|
||||
(void)strcpy(bootfile, getbootfile());
|
||||
(void)signal(SIGTERM, die);
|
||||
(void)signal(SIGINT, Debug ? die : SIG_IGN);
|
||||
(void)signal(SIGQUIT, Debug ? die : SIG_IGN);
|
||||
(void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
|
||||
sizeof(consfile.f_un.f_fname));
|
||||
(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
|
||||
(void)signal(SIGTERM, dodie);
|
||||
(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
|
||||
(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
|
||||
/*
|
||||
* We don't want the SIGCHLD and SIGHUP handlers to interfere
|
||||
* with each other; they are likely candidates for being called
|
||||
@ -426,7 +432,7 @@ main(argc, argv)
|
||||
for (i = 0; i < nfunix; i++) {
|
||||
memset(&sunx, 0, sizeof(sunx));
|
||||
sunx.sun_family = AF_UNIX;
|
||||
(void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
|
||||
(void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
|
||||
funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
|
||||
if (funix[i] < 0 ||
|
||||
bind(funix[i], (struct sockaddr *)&sunx,
|
||||
@ -484,53 +490,65 @@ main(argc, argv)
|
||||
tvp = &tv;
|
||||
tv.tv_sec = tv.tv_usec = 0;
|
||||
|
||||
for (;;) {
|
||||
fd_set readfds;
|
||||
int nfds = 0;
|
||||
|
||||
FD_ZERO(&readfds);
|
||||
if (fklog != -1) {
|
||||
FD_SET(fklog, &readfds);
|
||||
if (fklog > nfds)
|
||||
nfds = fklog;
|
||||
if (fklog != -1 && fklog > fdsrmax)
|
||||
fdsrmax = fklog;
|
||||
if (finet && !SecureMode) {
|
||||
for (i = 0; i < *finet; i++) {
|
||||
if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
|
||||
fdsrmax = finet[i+1];
|
||||
}
|
||||
}
|
||||
for (i = 0; i < nfunix; i++) {
|
||||
if (funix[i] != -1 && funix[i] > fdsrmax)
|
||||
fdsrmax = funix[i];
|
||||
}
|
||||
|
||||
fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
|
||||
sizeof(fd_mask));
|
||||
if (fdsr == NULL)
|
||||
errx(1, "calloc fd_set");
|
||||
|
||||
for (;;) {
|
||||
if (MarkSet)
|
||||
markit();
|
||||
if (WantDie)
|
||||
die(WantDie);
|
||||
|
||||
bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
|
||||
sizeof(fd_mask));
|
||||
|
||||
if (fklog != -1)
|
||||
FD_SET(fklog, fdsr);
|
||||
if (finet && !SecureMode) {
|
||||
for (i = 0; i < *finet; i++) {
|
||||
FD_SET(finet[i+1], &readfds);
|
||||
if (finet[i+1] > nfds)
|
||||
nfds = finet[i+1];
|
||||
if (finet[i+1] != -1)
|
||||
FD_SET(finet[i+1], fdsr);
|
||||
}
|
||||
}
|
||||
for (i = 0; i < nfunix; i++) {
|
||||
if (funix[i] != -1) {
|
||||
FD_SET(funix[i], &readfds);
|
||||
if (funix[i] > nfds)
|
||||
nfds = funix[i];
|
||||
}
|
||||
if (funix[i] != -1)
|
||||
FD_SET(funix[i], fdsr);
|
||||
}
|
||||
|
||||
/*dprintf("readfds = %#x\n", readfds);*/
|
||||
nfds = select(nfds+1, &readfds, (fd_set *)NULL,
|
||||
(fd_set *)NULL, tvp);
|
||||
if (nfds == 0) {
|
||||
i = select(fdsrmax+1, fdsr, NULL, NULL, tvp);
|
||||
switch (i) {
|
||||
case 0:
|
||||
if (tvp) {
|
||||
tvp = NULL;
|
||||
if (ppid != 1)
|
||||
kill(ppid, SIGALRM);
|
||||
}
|
||||
continue;
|
||||
}
|
||||
if (nfds < 0) {
|
||||
case -1:
|
||||
if (errno != EINTR)
|
||||
logerror("select");
|
||||
continue;
|
||||
}
|
||||
/*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/
|
||||
if (fklog != -1 && FD_ISSET(fklog, &readfds))
|
||||
if (fklog != -1 && FD_ISSET(fklog, fdsr))
|
||||
readklog();
|
||||
if (finet && !SecureMode) {
|
||||
for (i = 0; i < *finet; i++) {
|
||||
if (FD_ISSET(finet[i+1], &readfds)) {
|
||||
if (FD_ISSET(finet[i+1], fdsr)) {
|
||||
len = sizeof(frominet);
|
||||
l = recvfrom(finet[i+1], line, MAXLINE,
|
||||
0, (struct sockaddr *)&frominet,
|
||||
@ -547,7 +565,7 @@ main(argc, argv)
|
||||
}
|
||||
}
|
||||
for (i = 0; i < nfunix; i++) {
|
||||
if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) {
|
||||
if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) {
|
||||
len = sizeof(fromunix);
|
||||
l = recvfrom(funix[i], line, MAXLINE, 0,
|
||||
(struct sockaddr *)&fromunix, &len);
|
||||
@ -559,6 +577,8 @@ main(argc, argv)
|
||||
}
|
||||
}
|
||||
}
|
||||
if (fdsr)
|
||||
free(fdsr);
|
||||
}
|
||||
|
||||
static void
|
||||
@ -837,7 +857,7 @@ logmsg(pri, msg, from, flags)
|
||||
if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
|
||||
!strcmp(msg, f->f_prevline) &&
|
||||
!strcasecmp(from, f->f_prevhost)) {
|
||||
(void)strncpy(f->f_lasttime, timestamp, 15);
|
||||
(void)strlcpy(f->f_lasttime, timestamp, 16);
|
||||
f->f_prevcount++;
|
||||
dprintf("msg repeated %d times, %ld sec of %d\n",
|
||||
f->f_prevcount, (long)(now - f->f_time),
|
||||
@ -858,13 +878,12 @@ logmsg(pri, msg, from, flags)
|
||||
fprintlog(f, 0, (char *)NULL);
|
||||
f->f_repeatcount = 0;
|
||||
f->f_prevpri = pri;
|
||||
(void)strncpy(f->f_lasttime, timestamp, 15);
|
||||
(void)strncpy(f->f_prevhost, from,
|
||||
sizeof(f->f_prevhost)-1);
|
||||
f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0';
|
||||
(void)strlcpy(f->f_lasttime, timestamp, 16);
|
||||
(void)strlcpy(f->f_prevhost, from,
|
||||
sizeof(f->f_prevhost));
|
||||
if (msglen < MAXSVLINE) {
|
||||
f->f_prevlen = msglen;
|
||||
(void)strcpy(f->f_prevline, msg);
|
||||
(void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
|
||||
fprintlog(f, flags, (char *)NULL);
|
||||
} else {
|
||||
f->f_prevline[0] = 0;
|
||||
@ -963,8 +982,8 @@ fprintlog(f, flags, msg)
|
||||
v->iov_len = strlen(msg);
|
||||
} else if (f->f_prevcount > 1) {
|
||||
v->iov_base = repbuf;
|
||||
v->iov_len = sprintf(repbuf, "last message repeated %d times",
|
||||
f->f_prevcount);
|
||||
v->iov_len = snprintf(repbuf, sizeof repbuf,
|
||||
"last message repeated %d times", f->f_prevcount);
|
||||
} else {
|
||||
v->iov_base = f->f_prevline;
|
||||
v->iov_len = f->f_prevlen;
|
||||
@ -1121,8 +1140,7 @@ wallmsg(f, iov)
|
||||
while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
|
||||
if (ut.ut_name[0] == '\0')
|
||||
continue;
|
||||
strncpy(line, ut.ut_line, sizeof(ut.ut_line));
|
||||
line[sizeof(ut.ut_line)] = '\0';
|
||||
(void)strlcpy(line, ut.ut_line, sizeof(line));
|
||||
if (f->f_type == F_WALL) {
|
||||
if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
|
||||
errno = 0; /* already in msg */
|
||||
@ -1223,57 +1241,20 @@ cvthname(f)
|
||||
return (hname);
|
||||
}
|
||||
|
||||
void
|
||||
dodie(signo)
|
||||
int signo;
|
||||
{
|
||||
|
||||
WantDie = signo;
|
||||
}
|
||||
|
||||
void
|
||||
domark(signo)
|
||||
int signo;
|
||||
{
|
||||
struct filed *f;
|
||||
dq_t q;
|
||||
|
||||
now = time((time_t *)NULL);
|
||||
MarkSeq += TIMERINTVL;
|
||||
if (MarkSeq >= MarkInterval) {
|
||||
logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK);
|
||||
MarkSeq = 0;
|
||||
}
|
||||
|
||||
for (f = Files; f; f = f->f_next) {
|
||||
if (f->f_prevcount && now >= REPEATTIME(f)) {
|
||||
dprintf("flush %s: repeated %d times, %d sec.\n",
|
||||
TypeNames[f->f_type], f->f_prevcount,
|
||||
repeatinterval[f->f_repeatcount]);
|
||||
fprintlog(f, 0, (char *)NULL);
|
||||
BACKOFF(f);
|
||||
}
|
||||
}
|
||||
|
||||
/* Walk the dead queue, and see if we should signal somebody. */
|
||||
for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
|
||||
switch (q->dq_timeout) {
|
||||
case 0:
|
||||
/* Already signalled once, try harder now. */
|
||||
if (kill(q->dq_pid, SIGKILL) != 0)
|
||||
(void)deadq_remove(q->dq_pid);
|
||||
break;
|
||||
|
||||
case 1:
|
||||
/*
|
||||
* Timed out on dead queue, send terminate
|
||||
* signal. Note that we leave the removal
|
||||
* from the dead queue to reapchild(), which
|
||||
* will also log the event (unless the process
|
||||
* didn't even really exist, in case we simply
|
||||
* drop it from the dead queue).
|
||||
*/
|
||||
if (kill(q->dq_pid, SIGTERM) != 0)
|
||||
(void)deadq_remove(q->dq_pid);
|
||||
/* FALLTHROUGH */
|
||||
|
||||
default:
|
||||
q->dq_timeout--;
|
||||
}
|
||||
|
||||
(void)alarm(TIMERINTVL);
|
||||
MarkSet = 1;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1316,7 +1297,7 @@ die(signo)
|
||||
Initialized = was_initialized;
|
||||
if (signo) {
|
||||
dprintf("syslogd: exiting on signal %d\n", signo);
|
||||
(void)sprintf(buf, "exiting on signal %d", signo);
|
||||
(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
|
||||
errno = 0;
|
||||
logerror(buf);
|
||||
}
|
||||
@ -1406,8 +1387,8 @@ init(signo)
|
||||
* Foreach line in the conf table, open that file.
|
||||
*/
|
||||
f = NULL;
|
||||
strcpy(host, "*");
|
||||
strcpy(prog, "*");
|
||||
(void)strlcpy(host, "*", sizeof(host));
|
||||
(void)strlcpy(prog, "*", sizeof(prog));
|
||||
while (fgets(cline, sizeof(cline), cf) != NULL) {
|
||||
/*
|
||||
* check for end-of-section, comments, strip off trailing
|
||||
@ -1427,7 +1408,7 @@ init(signo)
|
||||
host[0] = *p++;
|
||||
while (isspace(*p)) p++;
|
||||
if ((!*p) || (*p == '*')) {
|
||||
strcpy(host, "*");
|
||||
(void)strlcpy(host, "*", sizeof(host));
|
||||
continue;
|
||||
}
|
||||
if (*p == '@')
|
||||
@ -1444,7 +1425,7 @@ init(signo)
|
||||
p++;
|
||||
while (isspace(*p)) p++;
|
||||
if ((!*p) || (*p == '*')) {
|
||||
strcpy(prog, "*");
|
||||
(void)strlcpy(prog, "*", sizeof(prog));
|
||||
continue;
|
||||
}
|
||||
for (i = 0; i < NAME_MAX; i++) {
|
||||
@ -1652,9 +1633,8 @@ cfline(line, f, prog, host)
|
||||
switch (*p)
|
||||
{
|
||||
case '@':
|
||||
(void)strncpy(f->f_un.f_forw.f_hname, ++p,
|
||||
sizeof(f->f_un.f_forw.f_hname)-1);
|
||||
f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0';
|
||||
(void)strlcpy(f->f_un.f_forw.f_hname, ++p,
|
||||
sizeof(f->f_un.f_forw.f_hname));
|
||||
memset(&hints, 0, sizeof(hints));
|
||||
hints.ai_family = family;
|
||||
hints.ai_socktype = SOCK_DGRAM;
|
||||
@ -1679,16 +1659,17 @@ cfline(line, f, prog, host)
|
||||
f->f_type = F_CONSOLE;
|
||||
else
|
||||
f->f_type = F_TTY;
|
||||
(void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1);
|
||||
(void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV - 1),
|
||||
sizeof(f->f_un.f_fname));
|
||||
} else {
|
||||
(void)strcpy(f->f_un.f_fname, p);
|
||||
(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
|
||||
f->f_type = F_FILE;
|
||||
}
|
||||
break;
|
||||
|
||||
case '|':
|
||||
f->f_un.f_pipe.f_pid = 0;
|
||||
(void)strcpy(f->f_un.f_pipe.f_pname, p + 1);
|
||||
(void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
|
||||
f->f_type = F_PIPE;
|
||||
break;
|
||||
|
||||
@ -1743,6 +1724,59 @@ decode(name, codetab)
|
||||
return (-1);
|
||||
}
|
||||
|
||||
void
|
||||
markit(void)
|
||||
{
|
||||
struct filed *f;
|
||||
dq_t q;
|
||||
|
||||
now = time((time_t *)NULL);
|
||||
MarkSeq += TIMERINTVL;
|
||||
if (MarkSeq >= MarkInterval) {
|
||||
logmsg(LOG_INFO, "-- MARK --",
|
||||
LocalHostName, ADDDATE|MARK);
|
||||
MarkSeq = 0;
|
||||
}
|
||||
|
||||
for (f = Files; f; f = f->f_next) {
|
||||
if (f->f_prevcount && now >= REPEATTIME(f)) {
|
||||
dprintf("flush %s: repeated %d times, %d sec.\n",
|
||||
TypeNames[f->f_type], f->f_prevcount,
|
||||
repeatinterval[f->f_repeatcount]);
|
||||
fprintlog(f, 0, (char *)NULL);
|
||||
BACKOFF(f);
|
||||
}
|
||||
}
|
||||
|
||||
/* Walk the dead queue, and see if we should signal somebody. */
|
||||
for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries))
|
||||
switch (q->dq_timeout) {
|
||||
case 0:
|
||||
/* Already signalled once, try harder now. */
|
||||
if (kill(q->dq_pid, SIGKILL) != 0)
|
||||
(void)deadq_remove(q->dq_pid);
|
||||
break;
|
||||
|
||||
case 1:
|
||||
/*
|
||||
* Timed out on dead queue, send terminate
|
||||
* signal. Note that we leave the removal
|
||||
* from the dead queue to reapchild(), which
|
||||
* will also log the event (unless the process
|
||||
* didn't even really exist, in case we simply
|
||||
* drop it from the dead queue).
|
||||
*/
|
||||
if (kill(q->dq_pid, SIGTERM) != 0)
|
||||
(void)deadq_remove(q->dq_pid);
|
||||
/* FALLTHROUGH */
|
||||
|
||||
default:
|
||||
q->dq_timeout--;
|
||||
}
|
||||
MarkSet = 0;
|
||||
(void)alarm(TIMERINTVL);
|
||||
}
|
||||
|
||||
/*
|
||||
* fork off and become a daemon, but wait for the child to come online
|
||||
* before returing to the parent, or we get disk thrashing at boot etc.
|
||||
@ -1812,7 +1846,7 @@ timedout(sig)
|
||||
if (left == 0)
|
||||
errx(1, "timed out waiting for child");
|
||||
else
|
||||
exit(0);
|
||||
_exit(0);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2006,7 +2040,7 @@ validate(sa, hname)
|
||||
/* traditional behaviour, allow everything */
|
||||
return 1;
|
||||
|
||||
strlcpy(name, hname, sizeof name);
|
||||
(void)strlcpy(name, hname, sizeof(name));
|
||||
memset(&hints, 0, sizeof(hints));
|
||||
hints.ai_family = PF_UNSPEC;
|
||||
hints.ai_socktype = SOCK_DGRAM;
|
||||
|
Loading…
Reference in New Issue
Block a user