Subverting mremap()

Subverting mremap()

Posted Jan 8, 2004 3:25 UTC (Thu) by StevenCole (guest, #3068)
Parent article: Subverting mremap()

The real fix for 2.6.1-rc2 showed up in the BK repository about an hour ago. Michal Schmidt posted this fix to the original fix. Here it is:

--- a/mm/mremap.c	Wed Jan  7 19:22:34 2004
+++ b/mm/mremap.c	Wed Jan  7 19:22:34 2004
@@ -316,7 +316,7 @@
 	new_len = PAGE_ALIGN(new_len);
 
 	/* Don't allow the degenerate cases */
-	if (!(old_len | new_len))
+	if (!old_len || !new_len)
 		goto out;
 
 	/* new_addr is only valid if MREMAP_FIXED is specified */

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