Commit f04b772b authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: Enhance chunk validation check 



Enhance chunk validation:
1) Num_stripes
   We already have such check but it's only in super block sys chunk
   array.
   Now check all on-disk chunks.

2) Chunk logical
   It should be aligned to sector size.
   This behavior should be *DOUBLE CHECKED* for 64K sector size like
   PPC64 or AArch64.
   Maybe we can found some hidden bugs.

3) Chunk length
   Same as chunk logical, should be aligned to sector size.

4) Stripe length
   It should be power of 2.

5) Chunk type
   Any bit out of TYPE_MAS | PROFILE_MASK is invalid.

With all these much restrict rules, several fuzzed image reported in
mail list should no longer cause kernel panic.

Reported-by: default avatarVegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 319e4d06

fs/btrfs/volumes.c

+32 −1
Original line number Diff line number Diff line
@@ -6211,6 +6211,7 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, 
	struct extent_map *em;

	u64 logical;

	u64 length;

	u64 stripe_len;

	u64 devid;

	u8 uuid[BTRFS_UUID_SIZE];

	int num_stripes;
@@ -6219,6 +6220,37 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, 


	logical = key->offset;

	length = btrfs_chunk_length(leaf, chunk);

	stripe_len = btrfs_chunk_stripe_len(leaf, chunk);

	num_stripes = btrfs_chunk_num_stripes(leaf, chunk);

	/* Validation check */

	if (!num_stripes) {

		btrfs_err(root->fs_info, "invalid chunk num_stripes: %u",

			  num_stripes);

		return -EIO;

	}

	if (!IS_ALIGNED(logical, root->sectorsize)) {

		btrfs_err(root->fs_info,

			  "invalid chunk logical %llu", logical);

		return -EIO;

	}

	if (!length || !IS_ALIGNED(length, root->sectorsize)) {

		btrfs_err(root->fs_info,

			"invalid chunk length %llu", length);

		return -EIO;

	}

	if (!is_power_of_2(stripe_len)) {

		btrfs_err(root->fs_info, "invalid chunk stripe length: %llu",

			  stripe_len);

		return -EIO;

	}

	if (~(BTRFS_BLOCK_GROUP_TYPE_MASK | BTRFS_BLOCK_GROUP_PROFILE_MASK) &

	    btrfs_chunk_type(leaf, chunk)) {

		btrfs_err(root->fs_info, "unrecognized chunk type: %llu",

			  ~(BTRFS_BLOCK_GROUP_TYPE_MASK |

			    BTRFS_BLOCK_GROUP_PROFILE_MASK) &

			  btrfs_chunk_type(leaf, chunk));

		return -EIO;

	}



	read_lock(&map_tree->map_tree.lock);

	em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
@@ -6235,7 +6267,6 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, 
	em = alloc_extent_map();

	if (!em)

		return -ENOMEM;

	num_stripes = btrfs_chunk_num_stripes(leaf, chunk);

	map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);

	if (!map) {

		free_extent_map(em);

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