Commit 434a964d authored Nov 02, 2011 by Phillip Lougher Committed by Linus Torvalds Nov 02, 2011

hfs: fix hfs_find_init() sb->ext_tree NULL ptr oops



Clement Lecigne reports a filesystem which causes a kernel oops in
hfs_find_init() trying to dereference sb->ext_tree which is NULL.

This proves to be because the filesystem has a corrupted MDB extent
record, where the extents file does not fit into the first three extents
in the file record (the first blocks).

In hfs_get_block() when looking up the blocks for the extent file
(HFS_EXT_CNID), it fails the first blocks special case, and falls
through to the extent code (which ultimately calls hfs_find_init())
which is in the process of being initialised.

Hfs avoids this scenario by always having the extents b-tree fitting
into the first blocks (the extents B-tree can't have overflow extents).

The fix is to check at mount time that the B-tree fits into first
blocks, i.e.  fail if HFS_I(inode)->alloc_blocks >=
HFS_I(inode)->first_blocks

Note, the existing commit 47f365eb ("hfs: fix oops on mount with
corrupted btree extent records") becomes subsumed into this as a special
case, but only for the extents B-tree (HFS_EXT_CNID), it is perfectly
acceptable for the catalog B-Tree file to grow beyond three extents,
with the remaining extent descriptors in the extents overfow.

This fixes CVE-2011-2203

Reported-by: Clement LECIGNE <clement.lecigne@netasq.com>
Signed-off-by: Phillip Lougher <plougher@redhat.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 3069083c

fs/hfs/btree.c

+15 −5

Original line number	Diff line number	Diff line
		@@ -46,11 +46,26 @@ struct hfs_btree hfs_btree_open(struct super_block sb, u32 id, btree_keycmp ke
		case HFS_EXT_CNID:
		hfs_inode_read_fork(tree->inode, mdb->drXTExtRec, mdb->drXTFlSize,
		mdb->drXTFlSize, be32_to_cpu(mdb->drXTClpSiz));
		if (HFS_I(tree->inode)->alloc_blocks >
		HFS_I(tree->inode)->first_blocks) {
		printk(KERN_ERR "hfs: invalid btree extent records\n");
		unlock_new_inode(tree->inode);
		goto free_inode;
		}

		tree->inode->i_mapping->a_ops = &hfs_btree_aops;
		break;
		case HFS_CAT_CNID:
		hfs_inode_read_fork(tree->inode, mdb->drCTExtRec, mdb->drCTFlSize,
		mdb->drCTFlSize, be32_to_cpu(mdb->drCTClpSiz));

		if (!HFS_I(tree->inode)->first_blocks) {
		printk(KERN_ERR "hfs: invalid btree extent records "
		"(0 size).\n");
		unlock_new_inode(tree->inode);
		goto free_inode;
		}

		tree->inode->i_mapping->a_ops = &hfs_btree_aops;
		break;
		default:
		@@ -59,11 +74,6 @@ struct hfs_btree hfs_btree_open(struct super_block sb, u32 id, btree_keycmp ke
		}
		unlock_new_inode(tree->inode);

		if (!HFS_I(tree->inode)->first_blocks) {
		printk(KERN_ERR "hfs: invalid btree extent records (0 size).\n");
		goto free_inode;
		}

		mapping = tree->inode->i_mapping;
		page = read_mapping_page(mapping, 0, NULL);
		if (IS_ERR(page))

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