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authorQu Wenruo <quwenruo@cn.fujitsu.com>2015-12-15 09:14:37 +0800
committerChris Mason <clm@fb.com>2016-01-19 18:21:41 -0800
commitf04b772bfc17f502703794f4d100d12155c1a1a9 (patch)
treef69d161dd9d146284d0e0870fcfce492ea210a6a
parent319e4d0661e5323c9f9945f0f8fb5905e5fe74c3 (diff)
downloadop-kernel-dev-f04b772bfc17f502703794f4d100d12155c1a1a9.zip
op-kernel-dev-f04b772bfc17f502703794f4d100d12155c1a1a9.tar.gz
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: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
-rw-r--r--fs/btrfs/volumes.c33
1 files changed, 32 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 3d0122d..91bd948 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -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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