Petr Hracek
11 years ago
parent
810d81d695
commit
d74b327256
@ -1,114 +0,0 @@
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diff -Naur screen-orig/src/acls.c screen/src/acls.c
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--- screen-orig/src/acls.c 2012-03-07 06:05:35.000000000 -0500
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+++ screen/src/acls.c 2012-04-23 22:57:03.595468724 -0400
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@@ -544,12 +544,25 @@
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if (pw2 && *pw2 && *pw2 != '\377') /* provided a system password */
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{
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- if (!*pass || /* but needed none */
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- strcmp(crypt(pw2, pass), pass))
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+ if (!*pass) /* but needed none */
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{
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debug("System password mismatch\n");
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sorry++;
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}
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+ else
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+ {
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+ char *cryptbuf = crypt(pw2, pass);
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+ if(cryptbuf == NULL)
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+ {
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+ debug("System crypt() failed\n");
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+ sorry++;
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+ }
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+ else if (strcmp(cryptbuf, pass))
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+ {
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+ debug("System password mismatch\n");
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+ sorry++;
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+ }
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+ }
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}
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else /* no pasword provided */
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if (*pass) /* but need one */
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@@ -557,12 +570,29 @@
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#endif
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if (pw1 && *pw1 && *pw1 != '\377') /* provided a screen password */
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{
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- if (!*u->u_password || /* but needed none */
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- strcmp(crypt(pw1, u->u_password), u->u_password))
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+ char *cryptbuf;
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+ if (!*u->u_password) /* but needed none */
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{
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debug("screen password mismatch\n");
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- sorry++;
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+ sorry++;
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}
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+ else
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+ {
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+ cryptbuf = crypt(pw1, u->u_password);
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+ if (cryptbuf == NULL)
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+ {
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+ debug("crypt() failed\n");
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+ sorry++;
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+ }
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+ else
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+ {
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+ if(strcmp(cryptbuf, u->u_password))
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+ {
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+ debug("screen password mismatch\n");
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+ sorry++;
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+ }
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+ }
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+ }
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}
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else /* no pasword provided */
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if (*u->u_password) /* but need one */
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diff -Naur screen-orig/src/misc.c screen/src/misc.c
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--- screen-orig/src/misc.c 2012-03-07 06:05:35.000000000 -0500
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+++ screen/src/misc.c 2012-04-23 22:34:56.740665509 -0400
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@@ -56,6 +56,8 @@
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{
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register char *cp;
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+ if(str == NULL)
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+ Panic(0, "SaveStr() received NULL - possibly failed crypt()");
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if ((cp = malloc(strlen(str) + 1)) == NULL)
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Panic(0, "%s", strnomem);
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else
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diff -Naur screen-orig/src/process.c screen/src/process.c
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--- screen-orig/src/process.c 2012-03-07 06:05:35.000000000 -0500
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+++ screen/src/process.c 2012-04-23 22:41:09.318930088 -0400
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@@ -6343,6 +6343,10 @@
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salt[st] = 'A' + (int)((time(0) >> 6 * st) % 26);
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salt[2] = 0;
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buf = crypt(u->u_password, salt);
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+ if(buf == NULL) {
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+ Msg(0, "[ no working crypt() - no secure ]");
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+ return;
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+ }
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bzero(u->u_password, strlen(u->u_password));
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free((char *)u->u_password);
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u->u_password = SaveStr(buf);
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diff -Naur screen-orig/src/socket.c screen/src/socket.c
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--- screen-orig/src/socket.c 2012-04-23 22:17:55.678316716 -0400
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+++ screen/src/socket.c 2012-04-23 22:29:12.225173900 -0400
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@@ -1565,13 +1565,18 @@
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c = *(unsigned char *)ibuf++;
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if (c == '\r' || c == '\n')
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{
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+ char *buf;
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up = D_user->u_password;
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pwdata->buf[l] = 0;
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- if (strncmp(crypt(pwdata->buf, up), up, strlen(up)))
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+ buf = crypt(pwdata->buf, up);
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+ if((buf == NULL) || (strncmp(buf, up, strlen(up))))
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{
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/* uh oh, user failed */
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bzero(pwdata->buf, sizeof(pwdata->buf));
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- AddStr("\r\nPassword incorrect.\r\n");
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+ if(buf==NULL)
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+ AddStr("\r\ncrypt() failed.\r\n");
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+ else
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+ AddStr("\r\nPassword incorrect.\r\n");
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D_processinputdata = 0; /* otherwise freed by FreeDis */
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FreeDisplay();
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Msg(0, "Illegal reattach attempt from terminal %s.", pwdata->m.m_tty);
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@ -1,26 +0,0 @@
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diff --git a/src/display.h b/src/display.h
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index e8b3b80..b1ab748 100644
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--- a/src/display.h
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+++ b/src/display.h
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@@ -73,7 +73,7 @@ struct display
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struct win *d_other; /* pointer to other window */
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int d_nonblock; /* -1 don't block if obufmax reached */
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/* >0: block after nonblock secs */
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- char d_termname[20 + 1]; /* $TERM */
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+ char d_termname[40 + 1]; /* $TERM */
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char *d_tentry; /* buffer for tgetstr */
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char d_tcinited; /* termcap inited flag */
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int d_width, d_height; /* width/height of the screen */
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diff --git a/src/screen.h b/src/screen.h
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index 5c93f32..1a388e3 100644
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--- a/src/screen.h
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+++ b/src/screen.h
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@@ -214,7 +214,7 @@ struct msg
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char preselect[20];
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int esc; /* his new escape character unless -1 */
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int meta_esc; /* his new meta esc character unless -1 */
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- char envterm[20 + 1]; /* terminal type */
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+ char envterm[40 + 1]; /* terminal type */
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int encoding; /* encoding of display */
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int detachfirst; /* whether to detach remote sessions first */
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}
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@ -1,13 +0,0 @@
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diff --git a/src/screen.c b/src/screen.c
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index af0fd82..cd0c71b 100644
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--- a/src/screen.c
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+++ b/src/screen.c
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@@ -1005,7 +1005,7 @@ char **av;
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Panic(0, "$HOME too long - sorry.");
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attach_tty = "";
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- if (!detached && !lsflag && !cmdflag && !(dflag && !mflag && !rflag && !xflag) && !(!mflag && !SockMatch && sty && !xflag))
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+ if (!detached && !lsflag && !cmdflag && !(dflag && !mflag && !rflag && !xflag) && !(!mflag && !SockMatch && sty && !xflag && !rflag))
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{
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#ifndef NAMEDPIPE
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int fl;
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@ -1,323 +0,0 @@
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commit 6eb1f1426bfd99f88d927838d51eabc2b13e73af
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Author: Miroslav Lichvar <mlichvar@redhat.com>
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Date: Thu Jan 13 17:37:47 2011 +0100
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Avoid dereferencing null pointer in utmp.c.
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diff --git a/src/utmp.c b/src/utmp.c
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index aae1948..fa8b87b 100644
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--- a/src/utmp.c
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+++ b/src/utmp.c
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@@ -575,7 +575,7 @@ struct win *wi;
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return ut_delete_user(slot, u.ut_pid, 0, 0) != 0;
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#endif
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#ifdef HAVE_UTEMPTER
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- if (eff_uid && wi->w_ptyfd != -1)
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+ if (eff_uid && wi && wi->w_ptyfd != -1)
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{
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/* sigh, linux hackers made the helper functions void */
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if (SLOT_USED(u))
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commit 4ebd6db10c712eb56d4e61f1a8d4a41d0465ed89
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Author: Miroslav Lichvar <mlichvar@redhat.com>
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Date: Thu Jan 13 17:36:06 2011 +0100
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Add more tty checks.
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diff --git a/src/extern.h b/src/extern.h
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index 2b9722e..c787d99 100644
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--- a/src/extern.h
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+++ b/src/extern.h
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@@ -110,6 +110,7 @@ extern void brktty __P((int));
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extern struct baud_values *lookup_baud __P((int bps));
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extern int SetBaud __P((struct mode *, int, int));
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extern int SttyMode __P((struct mode *, char *));
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+extern int CheckTtyname __P((char *));
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/* mark.c */
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diff --git a/src/screen.c b/src/screen.c
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index 3dde3b4..cc8f565 100644
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--- a/src/screen.c
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+++ b/src/screen.c
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@@ -970,8 +970,13 @@ char **av;
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else \
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attach_tty = ""; \
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} \
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- else if (stat(attach_tty, &st)) \
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- Panic(errno, "Cannot access '%s'", attach_tty); \
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+ else \
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+ { \
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+ if (stat(attach_tty, &st)) \
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+ Panic(errno, "Cannot access '%s'", attach_tty); \
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+ if (CheckTtyname(attach_tty)) \
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+ Panic(0, "Bad tty '%s'", attach_tty); \
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+ } \
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if (strlen(attach_tty) >= MAXPATHLEN) \
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Panic(0, "TtyName too long - sorry."); \
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} while (0)
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diff --git a/src/tty.sh b/src/tty.sh
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index f2afd54..e264796 100644
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--- a/src/tty.sh
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+++ b/src/tty.sh
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@@ -60,6 +60,7 @@ exit 0
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#include <sys/types.h>
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#include <signal.h>
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#include <fcntl.h>
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+#include <sys/stat.h>
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#ifndef sgi
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# include <sys/file.h>
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#endif
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@@ -1506,6 +1507,19 @@ int ibaud, obaud;
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return 0;
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}
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+
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+int
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+CheckTtyname (tty)
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+char *tty;
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+{
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+ struct stat st;
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+
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+ if (lstat(tty, &st) || !S_ISCHR(st.st_mode) ||
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+ (st.st_nlink > 1 && strncmp(tty, "/dev/", 5)))
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+ return -1;
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+ return 0;
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+}
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+
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/*
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* Write out the mode struct in a readable form
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*/
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diff --git a/src/utmp.c b/src/utmp.c
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index afa0948..aae1948 100644
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--- a/src/utmp.c
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+++ b/src/utmp.c
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@@ -361,7 +361,7 @@ RemoveLoginSlot()
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char *tty;
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debug("couln't zap slot -> do mesg n\n");
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D_loginttymode = 0;
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- if ((tty = ttyname(D_userfd)) && stat(tty, &stb) == 0 && (int)stb.st_uid == real_uid && ((int)stb.st_mode & 0777) != 0666)
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+ if ((tty = ttyname(D_userfd)) && stat(tty, &stb) == 0 && (int)stb.st_uid == real_uid && !CheckTtyname(tty) && ((int)stb.st_mode & 0777) != 0666)
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{
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D_loginttymode = (int)stb.st_mode & 0777;
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chmod(D_usertty, stb.st_mode & 0600);
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@@ -387,7 +387,7 @@ RestoreLoginSlot()
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}
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UT_CLOSE;
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D_loginslot = (slot_t)0;
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- if (D_loginttymode && (tty = ttyname(D_userfd)))
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+ if (D_loginttymode && (tty = ttyname(D_userfd)) && !CheckTtyname(tty))
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chmod(tty, D_loginttymode);
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}
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@@ -853,7 +853,7 @@ getlogin()
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for (fd = 0; fd <= 2 && (tty = ttyname(fd)) == NULL; fd++)
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;
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- if ((tty == NULL) || ((fd = open(UTMP_FILE, O_RDONLY)) < 0))
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+ if ((tty == NULL) || CheckTtyname(tty) || ((fd = open(UTMP_FILE, O_RDONLY)) < 0))
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return NULL;
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tty = stripdev(tty);
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retbuf[0] = '\0';
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commit 8e7fcb821dc7204a27d88707284e259444671c12
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Author: Miroslav Lichvar <mlichvar@redhat.com>
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Date: Thu Jan 13 17:31:16 2011 +0100
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Don't assign address of auto variable to outer scope symbol.
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diff --git a/src/socket.c b/src/socket.c
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index 940034d..7507d75 100644
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--- a/src/socket.c
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+++ b/src/socket.c
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@@ -722,6 +722,7 @@ struct msg *mp;
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char *args[MAXARGS];
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register int n;
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register char **pp = args, *p = mp->m.create.line;
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+ char buf[20];
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nwin = nwin_undef;
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n = mp->m.create.nargs;
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@@ -731,7 +732,6 @@ struct msg *mp;
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if (n)
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{
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int l, num;
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- char buf[20];
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l = strlen(p);
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if (IsNumColon(p, 10, buf, sizeof(buf)))
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commit 2a0e0dc7e05b36f374a074f6627efece3695f8c7
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Author: Miroslav Lichvar <mlichvar@redhat.com>
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Date: Thu Jan 13 17:24:04 2011 +0100
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Remove redundant if statements.
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diff --git a/src/braille_tsi.c b/src/braille_tsi.c
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index 6768291..6f84913 100644
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--- a/src/braille_tsi.c
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+++ b/src/braille_tsi.c
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@@ -127,7 +127,6 @@ display_status_tsi()
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r = read(bd.bd_fd,ibuf,1);
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if (r != 1)
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return -1;
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- if (r != -1)
|
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if (ibuf[0] == 'V')
|
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r = read(bd.bd_fd, ibuf, 3);
|
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else
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diff --git a/src/fileio.c b/src/fileio.c
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index 88fbf64..bd29011 100644
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--- a/src/fileio.c
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+++ b/src/fileio.c
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@@ -80,8 +80,6 @@ register char *str1, *str2;
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}
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else
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{
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- if (len1 == 0)
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- return 0;
|
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if ((cp = malloc((unsigned) len1 + add_colon + 1)) == NULL)
|
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Panic(0, "%s", strnomem);
|
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cp[len1 + add_colon] = '\0';
|
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|
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commit e75e7a0cf5319e10aae0c45e17ce70d86ef2aee8
|
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Author: Miroslav Lichvar <mlichvar@redhat.com>
|
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Date: Thu Jan 13 17:18:59 2011 +0100
|
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|
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Set PAM_TTY item.
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|
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diff --git a/src/attacher.c b/src/attacher.c
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index 1fab5b2..460f1ea 100644
|
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--- a/src/attacher.c
|
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+++ b/src/attacher.c
|
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@@ -861,6 +861,7 @@ screen_builtin_lck()
|
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#ifdef USE_PAM
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pam_handle_t *pamh = 0;
|
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int pam_error;
|
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+ char *tty_name;
|
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#else
|
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char *pass, mypass[16 + 1], salt[3];
|
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#endif
|
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@@ -932,6 +933,15 @@ screen_builtin_lck()
|
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pam_error = pam_start("screen", ppp->pw_name, &PAM_conversation, &pamh);
|
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if (pam_error != PAM_SUCCESS)
|
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AttacherFinit(SIGARG); /* goodbye */
|
||||
+
|
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+ if (strncmp(attach_tty, "/dev/", 5) == 0)
|
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+ tty_name = attach_tty + 5;
|
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+ else
|
||||
+ tty_name = attach_tty;
|
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+ pam_error = pam_set_item(pamh, PAM_TTY, tty_name);
|
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+ if (pam_error != PAM_SUCCESS)
|
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+ AttacherFinit(SIGARG); /* goodbye */
|
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+
|
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pam_error = pam_authenticate(pamh, 0);
|
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pam_end(pamh, pam_error);
|
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PAM_conversation.appdata_ptr = 0;
|
||||
|
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commit eb2e13f633f9615e9b60f19e1649f46bd07b2802
|
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Author: Miroslav Lichvar <mlichvar@redhat.com>
|
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Date: Thu Jan 13 17:16:59 2011 +0100
|
||||
|
||||
Check return code from setgid/setuid.
|
||||
|
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diff --git a/src/attacher.c b/src/attacher.c
|
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index 370d594..1fab5b2 100644
|
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--- a/src/attacher.c
|
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+++ b/src/attacher.c
|
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@@ -185,8 +185,8 @@ int how;
|
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if (ret == SIG_POWER_BYE)
|
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{
|
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int ppid;
|
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- setgid(real_gid);
|
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- setuid(real_uid);
|
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+ if (setgid(real_gid) || setuid(real_uid))
|
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+ Panic(errno, "setuid/gid");
|
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if ((ppid = getppid()) > 1)
|
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Kill(ppid, SIGHUP);
|
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exit(0);
|
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@@ -282,7 +282,10 @@ int how;
|
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#ifdef MULTIUSER
|
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if (!multiattach)
|
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#endif
|
||||
- setuid(real_uid);
|
||||
+ {
|
||||
+ if (setuid(real_uid))
|
||||
+ Panic(errno, "setuid");
|
||||
+ }
|
||||
#if defined(MULTIUSER) && defined(USE_SETEUID)
|
||||
else
|
||||
{
|
||||
@@ -290,7 +293,8 @@ int how;
|
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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);
|
||||
@ -1,40 +0,0 @@
|
||||
diff --git a/src/help.c b/src/help.c
|
||||
index 095f96b..a2b8614 100644
|
||||
--- a/src/help.c
|
||||
+++ b/src/help.c
|
||||
@@ -86,12 +86,14 @@ char *myname, *message, *arg;
|
||||
#if defined(LOGOUTOK) && defined(UTMPOK)
|
||||
printf("-l Login mode on (update %s), -ln = off.\n", UTMPFILE);
|
||||
#endif
|
||||
- printf("-ls [match] or -list. Do nothing, just list our SockDir [on possible matches].\n");
|
||||
+ printf("-ls [match] or\n");
|
||||
+ printf("-list Do nothing, just list our SockDir [on possible matches].\n");
|
||||
printf("-L Turn on output logging.\n");
|
||||
printf("-m ignore $STY variable, do create a new screen session.\n");
|
||||
printf("-O Choose optimal output rather than exact vt100 emulation.\n");
|
||||
printf("-p window Preselect the named window if it exists.\n");
|
||||
printf("-q Quiet startup. Exits with non-zero return code if unsuccessful.\n");
|
||||
+ printf("-Q Commands will send the response to the stdout of the querying process.\n");
|
||||
printf("-r [session] Reattach to a detached screen process.\n");
|
||||
printf("-R Reattach if possible, otherwise start a new session.\n");
|
||||
printf("-s shell Shell to execute rather than $SHELL.\n");
|
||||
diff --git a/src/help.c.ipv6 b/src/help.c.ipv6
|
||||
index 8726b1b..8446f34 100644
|
||||
--- a/src/help.c.ipv6
|
||||
+++ b/src/help.c.ipv6
|
||||
@@ -82,12 +82,14 @@ char *myname, *message, *arg;
|
||||
#if defined(LOGOUTOK) && defined(UTMPOK)
|
||||
printf("-l Login mode on (update %s), -ln = off.\n", UTMPFILE);
|
||||
#endif
|
||||
- printf("-ls [match] or -list. Do nothing, just list our SockDir [on possible matches].\n");
|
||||
+ printf("-ls [match] or\n");
|
||||
+ printf("-list Do nothing, just list our SockDir [on possible matches].\n");
|
||||
printf("-L Turn on output logging.\n");
|
||||
printf("-m ignore $STY variable, do create a new screen session.\n");
|
||||
printf("-O Choose optimal output rather than exact vt100 emulation.\n");
|
||||
printf("-p window Preselect the named window if it exists.\n");
|
||||
printf("-q Quiet startup. Exits with non-zero return code if unsuccessful.\n");
|
||||
+ printf("-Q Commands will send the response to the stdout of the querying process.\n");
|
||||
printf("-r [session] Reattach to a detached screen process.\n");
|
||||
printf("-R Reattach if possible, otherwise start a new session.\n");
|
||||
printf("-s shell Shell to execute rather than $SHELL.\n");
|
||||
@ -1,13 +0,0 @@
|
||||
diff --git a/src/doc/screen.1 b/src/doc/screen.1
|
||||
index 70b39df..22d8dc8 100644
|
||||
--- a/src/doc/screen.1
|
||||
+++ b/src/doc/screen.1
|
||||
@@ -3058,7 +3058,7 @@ Stuff the string
|
||||
.I string
|
||||
in the input buffer of the current window.
|
||||
This is like the \*Qpaste\*U command but with much less overhead.
|
||||
-Without a paramter, screen will prompt for a string to stuff.
|
||||
+Without a parameter, screen will prompt for a string to stuff.
|
||||
You cannot paste
|
||||
large buffers with the \*Qstuff\*U command. It is most useful for key
|
||||
bindings. See also \*Qbindkey\*U.
|
||||
Loading…
Reference in new issue