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screen/screen-cc.patch

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commit 6eb1f1426bfd99f88d927838d51eabc2b13e73af
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu Jan 13 17:37:47 2011 +0100
Avoid dereferencing null pointer in utmp.c.
diff --git a/src/utmp.c b/src/utmp.c
index aae1948..fa8b87b 100644
--- a/src/utmp.c
+++ b/src/utmp.c
@@ -575,7 +575,7 @@ struct win *wi;
return ut_delete_user(slot, u.ut_pid, 0, 0) != 0;
#endif
#ifdef HAVE_UTEMPTER
- if (eff_uid && wi->w_ptyfd != -1)
+ if (eff_uid && wi && wi->w_ptyfd != -1)
{
/* sigh, linux hackers made the helper functions void */
if (SLOT_USED(u))
commit 4ebd6db10c712eb56d4e61f1a8d4a41d0465ed89
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu Jan 13 17:36:06 2011 +0100
Add more tty checks.
diff --git a/src/extern.h b/src/extern.h
index 2b9722e..c787d99 100644
--- a/src/extern.h
+++ b/src/extern.h
@@ -110,6 +110,7 @@ extern void brktty __P((int));
extern struct baud_values *lookup_baud __P((int bps));
extern int SetBaud __P((struct mode *, int, int));
extern int SttyMode __P((struct mode *, char *));
+extern int CheckTtyname __P((char *));
/* mark.c */
diff --git a/src/screen.c b/src/screen.c
index 3dde3b4..cc8f565 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -970,8 +970,13 @@ char **av;
else \
attach_tty = ""; \
} \
- else if (stat(attach_tty, &st)) \
- Panic(errno, "Cannot access '%s'", attach_tty); \
+ else \
+ { \
+ if (stat(attach_tty, &st)) \
+ Panic(errno, "Cannot access '%s'", attach_tty); \
+ if (CheckTtyname(attach_tty)) \
+ Panic(0, "Bad tty '%s'", attach_tty); \
+ } \
if (strlen(attach_tty) >= MAXPATHLEN) \
Panic(0, "TtyName too long - sorry."); \
} while (0)
diff --git a/src/tty.sh b/src/tty.sh
index f2afd54..e264796 100644
--- a/src/tty.sh
+++ b/src/tty.sh
@@ -60,6 +60,7 @@ exit 0
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
+#include <sys/stat.h>
#ifndef sgi
# include <sys/file.h>
#endif
@@ -1506,6 +1507,19 @@ int ibaud, obaud;
return 0;
}
+
+int
+CheckTtyname (tty)
+char *tty;
+{
+ struct stat st;
+
+ if (lstat(tty, &st) || !S_ISCHR(st.st_mode) ||
+ (st.st_nlink > 1 && strncmp(tty, "/dev/", 5)))
+ return -1;
+ return 0;
+}
+
/*
* Write out the mode struct in a readable form
*/
diff --git a/src/utmp.c b/src/utmp.c
index afa0948..aae1948 100644
--- a/src/utmp.c
+++ b/src/utmp.c
@@ -361,7 +361,7 @@ RemoveLoginSlot()
char *tty;
debug("couln't zap slot -> do mesg n\n");
D_loginttymode = 0;
- if ((tty = ttyname(D_userfd)) && stat(tty, &stb) == 0 && (int)stb.st_uid == real_uid && ((int)stb.st_mode & 0777) != 0666)
+ if ((tty = ttyname(D_userfd)) && stat(tty, &stb) == 0 && (int)stb.st_uid == real_uid && !CheckTtyname(tty) && ((int)stb.st_mode & 0777) != 0666)
{
D_loginttymode = (int)stb.st_mode & 0777;
chmod(D_usertty, stb.st_mode & 0600);
@@ -387,7 +387,7 @@ RestoreLoginSlot()
}
UT_CLOSE;
D_loginslot = (slot_t)0;
- if (D_loginttymode && (tty = ttyname(D_userfd)))
+ if (D_loginttymode && (tty = ttyname(D_userfd)) && !CheckTtyname(tty))
chmod(tty, D_loginttymode);
}
@@ -853,7 +853,7 @@ getlogin()
for (fd = 0; fd <= 2 && (tty = ttyname(fd)) == NULL; fd++)
;
- if ((tty == NULL) || ((fd = open(UTMP_FILE, O_RDONLY)) < 0))
+ if ((tty == NULL) || CheckTtyname(tty) || ((fd = open(UTMP_FILE, O_RDONLY)) < 0))
return NULL;
tty = stripdev(tty);
retbuf[0] = '\0';
commit 8e7fcb821dc7204a27d88707284e259444671c12
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu Jan 13 17:31:16 2011 +0100
Don't assign address of auto variable to outer scope symbol.
diff --git a/src/socket.c b/src/socket.c
index 940034d..7507d75 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -722,6 +722,7 @@ struct msg *mp;
char *args[MAXARGS];
register int n;
register char **pp = args, *p = mp->m.create.line;
+ char buf[20];
nwin = nwin_undef;
n = mp->m.create.nargs;
@@ -731,7 +732,6 @@ struct msg *mp;
if (n)
{
int l, num;
- char buf[20];
l = strlen(p);
if (IsNumColon(p, 10, buf, sizeof(buf)))
commit 2a0e0dc7e05b36f374a074f6627efece3695f8c7
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu Jan 13 17:24:04 2011 +0100
Remove redundant if statements.
diff --git a/src/braille_tsi.c b/src/braille_tsi.c
index 6768291..6f84913 100644
--- a/src/braille_tsi.c
+++ b/src/braille_tsi.c
@@ -127,7 +127,6 @@ display_status_tsi()
r = read(bd.bd_fd,ibuf,1);
if (r != 1)
return -1;
- if (r != -1)
if (ibuf[0] == 'V')
r = read(bd.bd_fd, ibuf, 3);
else
diff --git a/src/fileio.c b/src/fileio.c
index 88fbf64..bd29011 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -80,8 +80,6 @@ register char *str1, *str2;
}
else
{
- if (len1 == 0)
- return 0;
if ((cp = malloc((unsigned) len1 + add_colon + 1)) == NULL)
Panic(0, "%s", strnomem);
cp[len1 + add_colon] = '\0';
commit e75e7a0cf5319e10aae0c45e17ce70d86ef2aee8
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu Jan 13 17:18:59 2011 +0100
Set PAM_TTY item.
diff --git a/src/attacher.c b/src/attacher.c
index 1fab5b2..460f1ea 100644
--- a/src/attacher.c
+++ b/src/attacher.c
@@ -861,6 +861,7 @@ screen_builtin_lck()
#ifdef USE_PAM
pam_handle_t *pamh = 0;
int pam_error;
+ char *tty_name;
#else
char *pass, mypass[16 + 1], salt[3];
#endif
@@ -932,6 +933,15 @@ screen_builtin_lck()
pam_error = pam_start("screen", ppp->pw_name, &PAM_conversation, &pamh);
if (pam_error != PAM_SUCCESS)
AttacherFinit(SIGARG); /* goodbye */
+
+ if (strncmp(attach_tty, "/dev/", 5) == 0)
+ tty_name = attach_tty + 5;
+ else
+ tty_name = attach_tty;
+ pam_error = pam_set_item(pamh, PAM_TTY, tty_name);
+ if (pam_error != PAM_SUCCESS)
+ AttacherFinit(SIGARG); /* goodbye */
+
pam_error = pam_authenticate(pamh, 0);
pam_end(pamh, pam_error);
PAM_conversation.appdata_ptr = 0;
commit eb2e13f633f9615e9b60f19e1649f46bd07b2802
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu Jan 13 17:16:59 2011 +0100
Check return code from setgid/setuid.
diff --git a/src/attacher.c b/src/attacher.c
index 370d594..1fab5b2 100644
--- a/src/attacher.c
+++ b/src/attacher.c
@@ -185,8 +185,8 @@ int how;
if (ret == SIG_POWER_BYE)
{
int ppid;
- setgid(real_gid);
- setuid(real_uid);
+ if (setgid(real_gid) || setuid(real_uid))
+ Panic(errno, "setuid/gid");
if ((ppid = getppid()) > 1)
Kill(ppid, SIGHUP);
exit(0);
@@ -282,7 +282,10 @@ int how;
#ifdef MULTIUSER
if (!multiattach)
#endif
- setuid(real_uid);
+ {
+ if (setuid(real_uid))
+ Panic(errno, "setuid");
+ }
#if defined(MULTIUSER) && defined(USE_SETEUID)
else
{
@@ -290,7 +293,8 @@ int how;
xseteuid(real_uid); /* multi_uid, allow backend to send signals */
}
#endif
- setgid(real_gid);
+ if (setgid(real_gid))
+ Panic(errno, "setgid");
eff_uid = real_uid;
eff_gid = real_gid;
@@ -486,7 +490,8 @@ AttacherFinit SIGDEFARG
#ifdef MULTIUSER
if (tty_oldmode >= 0)
{
- setuid(own_uid);
+ if (setuid(own_uid))
+ Panic(errno, "setuid");
chmod(attach_tty, tty_oldmode);
}
#endif
@@ -504,11 +509,14 @@ AttacherFinitBye SIGDEFARG
if (multiattach)
exit(SIG_POWER_BYE);
#endif
- setgid(real_gid);
+ if (setgid(real_gid))
+ Panic(errno, "setgid");
#ifdef MULTIUSER
- setuid(own_uid);
+ if (setuid(own_uid))
+ Panic(errno, "setuid");
#else
- setuid(real_uid);
+ if (setuid(real_uid))
+ Panic(errno, "setuid");
#endif
/* we don't want to disturb init (even if we were root), eh? jw */
if ((ppid = getppid()) > 1)
@@ -679,11 +687,14 @@ static sigret_t
LockHup SIGDEFARG
{
int ppid = getppid();
- setgid(real_gid);
+ if (setgid(real_gid))
+ Panic(errno, "setgid");
#ifdef MULTIUSER
- setuid(own_uid);
+ if (setuid(own_uid))
+ Panic(errno, "setuid");
#else
- setuid(real_uid);
+ if (setuid(real_uid))
+ Panic(errno, "setuid");
#endif
if (ppid > 1)
Kill(ppid, SIGHUP);
@@ -710,11 +721,14 @@ LockTerminal()
if ((pid = fork()) == 0)
{
/* Child */
- setgid(real_gid);
+ if (setgid(real_gid))
+ Panic(errno, "setgid");
#ifdef MULTIUSER
- setuid(own_uid);
+ if (setuid(own_uid))
+ Panic(errno, "setuid");
#else
- setuid(real_uid); /* this should be done already */
+ if (setuid(real_uid)) /* this should be done already */
+ Panic(errno, "setuid");
#endif
closeallfiles(0); /* important: /etc/shadow may be open */
execl(prg, "SCREEN-LOCK", NULL);
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