diff -urN 2.3.99-pre6-pre3-manfred/drivers/char/serial.c 2.3.99-pre6-pre3-read-proc/drivers/char/serial.c
--- 2.3.99-pre6-pre3-manfred/drivers/char/serial.c	Fri Apr 21 19:17:19 2000
+++ 2.3.99-pre6-pre3-read-proc/drivers/char/serial.c	Fri Apr 21 19:21:44 2000
@@ -3137,30 +3137,32 @@
 	return ret;
 }
 
-int rs_read_proc(char *page, char **start, off_t off, int count,
+int rs_read_proc(char *page, char **start, off_t idx, ssize_t count,
 		 int *eof, void *data)
 {
-	int i, len = 0, l;
-	off_t	begin = 0;
+	int n;
 
-	len += sprintf(page, "serinfo:1.0 driver:%s%s revision:%s\n",
-		       serial_version, LOCAL_VERSTRING, serial_revdate);
-	for (i = 0; i < NR_PORTS && len < 4000; i++) {
-		l = line_info(page + len, &rs_table[i]);
-		len += l;
-		if (len+begin > off+count)
-			goto done;
-		if (len+begin < off) {
-			begin += len;
-			len = 0;
-		}
+	*start = (char *) 1L;
+
+	if (!idx) {
+		n = sprintf(page, "serinfo:1.0 driver:%s%s revision:%s\n",
+			    serial_version, LOCAL_VERSTRING, serial_revdate);
+		goto out;
 	}
-	*eof = 1;
-done:
-	if (off >= len+begin)
-		return 0;
-	*start = page + (off-begin);
-	return ((count < begin+len-off) ? count : begin+len-off);
+	idx--;
+
+	n = 0;
+	if (idx >= NR_PORTS || idx < 0)
+		goto out;
+
+	n = line_info(page, &rs_table[idx]);
+	if (idx + 1 == NR_PORTS)
+		*eof = 1;
+
+ out:
+	if (n > count)
+		n = 0;
+	return n;
 }
 
 /*
diff -urN 2.3.99-pre6-pre3-manfred/drivers/isdn/avmb1/kcapi.c 2.3.99-pre6-pre3-read-proc/drivers/isdn/avmb1/kcapi.c
--- 2.3.99-pre6-pre3-manfred/drivers/isdn/avmb1/kcapi.c	Fri Apr 21 19:17:19 2000
+++ 2.3.99-pre6-pre3-read-proc/drivers/isdn/avmb1/kcapi.c	Fri Apr 21 19:19:06 2000
@@ -320,7 +320,7 @@
 		*eof = 1;
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.3.99-pre6-pre3-manfred/drivers/scsi/sg.c 2.3.99-pre6-pre3-read-proc/drivers/scsi/sg.c
--- 2.3.99-pre6-pre3-manfred/drivers/scsi/sg.c	Tue Apr 18 16:11:40 2000
+++ 2.3.99-pre6-pre3-read-proc/drivers/scsi/sg.c	Fri Apr 21 19:37:35 2000
@@ -2429,8 +2429,7 @@
 	*eof = infofp(buffer, &len, &begin, offset, size);      \
 	if (offset >= (begin + len))                            \
 	    return 0;                                           \
-	*start = buffer + ((begin > offset) ?                   \
-			(begin - offset) : (offset - begin));   \
+	*start = buffer + offset - begin;			\
 	return (size < (begin + len - offset)) ?                \
 				size : begin + len - offset;    \
     } while(0)
diff -urN 2.3.99-pre6-pre3-manfred/fs/proc/generic.c 2.3.99-pre6-pre3-read-proc/fs/proc/generic.c
--- 2.3.99-pre6-pre3-manfred/fs/proc/generic.c	Tue Apr 18 16:11:41 2000
+++ 2.3.99-pre6-pre3-read-proc/fs/proc/generic.c	Fri Apr 21 19:33:36 2000
@@ -140,9 +140,13 @@
 {
     switch (orig) {
     case 0:
+	if (offset < 0)
+	    return -EINVAL;    
 	file->f_pos = offset;
 	return(file->f_pos);
     case 1:
+	if (offset + file->f_pos < 0)
+	    return -EINVAL;    
 	file->f_pos += offset;
 	return(file->f_pos);
     case 2: