patch-2.0.34 linux/fs/devices.c

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diff -u --recursive --new-file v2.0.33/linux/fs/devices.c linux/fs/devices.c
@@ -227,6 +227,10 @@
 int blkdev_open(struct inode * inode, struct file * filp)
 {
 	int ret = -ENODEV;
+
+	if (securelevel > 0 && (filp->f_mode & FMODE_WRITE))
+		return -EACCES; /* cevans */
+
 	filp->f_op = get_blkfops(MAJOR(inode->i_rdev));
 	if (filp->f_op != NULL){
 		ret = 0;

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