1. 01 May, 2015 2 commits
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  7. 02 Apr, 2015 3 commits
  8. 17 Mar, 2015 2 commits
  9. 28 Feb, 2015 1 commit
    • Ryusuke Konishi's avatar
      nilfs2: fix potential memory overrun on inode · 957ed60b
      Ryusuke Konishi authored
      Each inode of nilfs2 stores a root node of a b-tree, and it turned out to
      have a memory overrun issue:
      
      Each b-tree node of nilfs2 stores a set of key-value pairs and the number
      of them (in "bn_nchildren" member of nilfs_btree_node struct), as well as
      a few other "bn_*" members.
      
      Since the value of "bn_nchildren" is used for operations on the key-values
      within the b-tree node, it can cause memory access overrun if a large
      number is incorrectly set to "bn_nchildren".
      
      For instance, nilfs_btree_node_lookup() function determines the range of
      binary search with it, and too large "bn_nchildren" leads
      nilfs_btree_node_get_key() in that function to overrun.
      
      As for intermediate b-tree nodes, this is prevented by a sanity check
      performed when each node is read from a drive, however, no sanity check
      has been done for root nodes stored in inodes.
      
      This patch fixes the issue by adding missing sanity check against b-tree
      root nodes so that it's called when on-memory inodes are read from ifile,
      inode metadata file.
      Signed-off-by: default avatarRyusuke Konishi <[email protected]>
      Cc: <[email protected]>
      Signed-off-by: default avatarAndrew Morton <[email protected]>
      Signed-off-by: default avatarLinus Torvalds <[email protected]>
      957ed60b
  10. 23 Feb, 2015 4 commits