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o Explicitly set the close-on-exec flag of descriptor 3 before

Browse source 
exec()ing.  Tidy up file dups in general prior to exec().
  This prevents our tun device (fd 3) from staying open (and
  configured) despite handing off all it's links and exiting
  (because ``cat'' holds it open).
o Don't bother SIG_DFL'ing signals before exec() as they're
  already trapped with specific handlers and will be handled
  correctly by the exec.
o Use values from paths.h for "/dev/" and "/dev/tty".
o Don't assert() in physical.c.
This commit is contained in:
Brian Somers 1998-05-01 19:22:23 +00:00
parent 47723d29e5
commit b762af4f95
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/cvs2svn/branches/MP/; revision=35603
6 changed files with 25 additions and 46 deletions
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3
usr.sbin/ppp/bundle.c
View file

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: bundle.c,v 1.1.2.65 1998/04/30 23:53:21 brian Exp $
* $Id: bundle.c,v 1.1.2.66 1998/05/01 19:19:54 brian Exp $
*/
#include <sys/types.h>
@ -1196,6 +1196,7 @@ bundle_SendDatalink(struct datalink *dl, int ppp_fd)
ppp_fd = fcntl(ppp_fd, F_DUPFD, 3);
link_fd = fcntl(link_fd, F_DUPFD, 3);
nfd = dup2(open(_PATH_DEVNULL, O_WRONLY), STDERR_FILENO);
fcntl(3, F_SETFD, 1); /* Set close-on-exec flag */
setsid();
setuid(geteuid());

30
usr.sbin/ppp/chat.c
View file

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: chat.c,v 1.44.2.26 1998/04/28 01:25:09 brian Exp $
* $Id: chat.c,v 1.44.2.27 1998/04/30 23:53:26 brian Exp $
*/
#include <sys/types.h>
@ -34,6 +34,7 @@
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@ -728,25 +729,16 @@ ExecStr(struct physical *physical, char *command, char *out, int olen)
}
if ((pid = fork()) == 0) {
TermTimerService();
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGALRM, SIG_DFL);
/* XXX-ML This looks like it might need more encapsulation. */
if (Physical_GetFD(physical) == 2) {
Physical_DupAndClose(physical);
}
close(fids[0]);
dup2(fids[1], 2);
close(fids[1]);
dup2(Physical_GetFD(physical), 0);
dup2(Physical_GetFD(physical), 1);
if ((nb = open("/dev/tty", O_RDWR)) > 3) {
dup2(nb, 3);
close(nb);
fids[1] = fcntl(fids[1], F_DUPFD, 4);
dup2(Physical_GetFD(physical), STDIN_FILENO);
dup2(STDIN_FILENO, STDOUT_FILENO);
dup2(fids[1], STDERR_FILENO);
close(3);
if (open(_PATH_TTY, O_RDWR) == 3)
fcntl(3, F_SETFD, 0); /* Clear close-on-exec flag */
}
else
fcntl(3, F_SETFD, 1); /* Set close-on-exec flag */
setuid(geteuid());
execvp(vector[0], vector);
fprintf(stderr, "execvp failed: %s: %s\n", vector[0], strerror(errno));

11
usr.sbin/ppp/command.c
View file

@ -17,7 +17,7 @@
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: command.c,v 1.131.2.74 1998/04/30 23:53:29 brian Exp $
* $Id: command.c,v 1.131.2.75 1998/05/01 19:19:58 brian Exp $
*
*/
#include <sys/types.h>
@ -123,7 +123,7 @@
#define NEG_DNS 50
const char Version[] = "2.0-beta";
const char VersionDate[] = "$Date: 1998/04/30 23:53:29 $";
const char VersionDate[] = "$Date: 1998/05/01 19:19:58 $";
static int ShowCommand(struct cmdargs const *);
static int TerminalCommand(struct cmdargs const *);
@ -317,11 +317,6 @@ ShellCommand(struct cmdargs const *arg, int bg)
shell = _PATH_BSHELL;
TermTimerService();
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGALRM, SIG_DFL);
if (arg->prompt)
fd = arg->prompt->fd_out;
@ -333,6 +328,8 @@ ShellCommand(struct cmdargs const *arg, int bg)
for (i = 0; i < 3; i++)
dup2(fd, i);
fcntl(3, F_SETFD, 1); /* Set close-on-exec flag */
setuid(geteuid());
if (arg->argc > arg->argn) {
/* substitute pseudo args */

8
usr.sbin/ppp/modem.c
View file

@ -17,7 +17,7 @@
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: modem.c,v 1.77.2.60 1998/04/30 23:53:49 brian Exp $
* $Id: modem.c,v 1.77.2.61 1998/05/01 19:20:09 brian Exp $
*
* TODO:
*/
@ -251,10 +251,12 @@ IntToSpeed(int nspeed)
static void
modem_SetDevice(struct physical *physical, const char *name)
{
int len = strlen(_PATH_DEV);
strncpy(physical->name.full, name, sizeof physical->name.full - 1);
physical->name.full[sizeof physical->name.full - 1] = '\0';
physical->name.base = strncmp(physical->name.full, "/dev/", 5) ?
physical->name.full : physical->name.full + 5;
physical->name.base = strncmp(physical->name.full, _PATH_DEV, len) ?
physical->name.full : physical->name.full + len;
}
/*

16
usr.sbin/ppp/physical.c
View file

@ -16,13 +16,12 @@
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: physical.c,v 1.1.2.27 1998/04/28 01:25:37 brian Exp $
* $Id: physical.c,v 1.1.2.28 1998/04/30 23:53:53 brian Exp $
*
*/
#include <sys/types.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -104,21 +103,10 @@ Physical_SetSync(struct physical *phys) {
int
Physical_SetRtsCts(struct physical *phys, int enable) {
assert(enable == 0 || enable == 1);
phys->cfg.rts_cts = enable;
phys->cfg.rts_cts = enable ? 1 : 0;
return 1;
}
void
Physical_DupAndClose(struct physical *phys) {
int nmodem;
nmodem = dup(phys->fd);
close(phys->fd);
phys->fd = nmodem;
}
/* Encapsulation for a read on the FD. Avoids some exposure, and
concentrates control. */
ssize_t

3
usr.sbin/ppp/physical.h
View file

@ -16,7 +16,7 @@
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: physical.h,v 1.1.2.21 1998/04/10 23:51:33 brian Exp $
* $Id: physical.h,v 1.1.2.22 1998/04/20 00:20:41 brian Exp $
*
*/
@ -90,7 +90,6 @@ int /* Can this be set? (Might not be a relevant attribute for this
device, for instance) */
Physical_SetRtsCts(struct physical *, int);
void Physical_DupAndClose(struct physical *);
ssize_t Physical_Read(struct physical *, void *, size_t);
ssize_t Physical_Write(struct physical *, const void *, size_t);
int Physical_UpdateSet(struct descriptor *, fd_set *, fd_set *, fd_set *,