3 May
2011
3 May
'11
1:26 p.m.
Access to the _free_map bitmap in the buddy allocator is possible beyond Max_mem when checking the free bit of the buddy. Thus bit bitmap size should be aligned to Max_size not Min_size.
regards Christian
diff --git a/src/kernel/fiasco/src/kern/buddy_alloc.cpp b/src/kernel/fiasco/src/kern/buddy_alloc.cpp index 96f2821..51e1239 100644 --- a/src/kernel/fiasco/src/kern/buddy_alloc.cpp +++ b/src/kernel/fiasco/src/kern/buddy_alloc.cpp @@ -55,7 +55,7 @@ public:
private: Head *_free[Num_sizes]; - Bitmap<(Max_mem+Min_size-1)/Min_size> _free_map; + Bitmap<(Max_mem+Max_size-1)/Min_size> _free_map; };