[uml-devel] [PATCH] fix writing into /dev/kmem

[Jeff Dike <jdike@addtoit.com>]

The patch below fixes a bug in the /dev/kmem driver which causes UML to
die if you write to it.  Of course, the kernel will die if you write random
crap to kernel memory, but at least it doesn't die in a UML-specific way.

This is a cut'n'paste from an xterm, so apply with patch -l.

				Jeff

--- drivers/char/mem.c~ 2004-01-05 11:23:32.000000000 -0500
+++ drivers/char/mem.c  2004-02-27 08:52:14.000000000 -0500
@@ -287,6 +287,7 @@
        ssize_t virtr = 0;
        char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
 
+       p = (unsigned long) __va(p);
        if (p < (unsigned long) high_memory) {
                wrote = count;
                if (count > (unsigned long) high_memory - p)
@@ -321,7 +322,7 @@
                free_page((unsigned long)kbuf);
        }
 
-       *ppos = p;
+       *ppos = __pa((void *) p);
        return virtr + wrote;
 }


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