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http://www.freebsd.org/security/advisories/FreeBSD-SA-13:06.mmap.asc
https://bugs.gentoo.org/show_bug.cgi?id=473688
Index: sys/vm/vm_map.c
===================================================================
--- sys/vm/vm_map.c (revision 251636)
+++ sys/vm/vm_map.c (working copy)
@@ -3761,6 +3761,12 @@ RetryLookup:;
vm_map_unlock_read(map);
return (KERN_PROTECTION_FAILURE);
}
+ if ((fault_typea & VM_PROT_COPY) != 0 &&
+ (entry->max_protection & VM_PROT_WRITE) == 0 &&
+ (entry->eflags & MAP_ENTRY_COW) == 0) {
+ vm_map_unlock_read(map);
+ return (KERN_PROTECTION_FAILURE);
+ }
/*
* If this page is not pageable, we have to get it for all possible
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