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btrfs: inode: Verify inode mode to avoid NULL pointer dereference

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[BUG]
When accessing a file on a crafted image, btrfs can crash in block layer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  PGD 136501067 P4D 136501067 PUD 124519067 PMD 0
  CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.0.0-rc8-default #252
  RIP: 0010:end_bio_extent_readpage+0x144/0x700
  Call Trace:
   <IRQ>
   blk_update_request+0x8f/0x350
   blk_mq_end_request+0x1a/0x120
   blk_done_softirq+0x99/0xc0
   __do_softirq+0xc7/0x467
   irq_exit+0xd1/0xe0
   call_function_single_interrupt+0xf/0x20
   </IRQ>
  RIP: 0010:default_idle+0x1e/0x170

[CAUSE]
The crafted image has a tricky corruption, the INODE_ITEM has a
different type against its parent dir:

        item 20 key (268 INODE_ITEM 0) itemoff 2808 itemsize 160
                generation 13 transid 13 size 1048576 nbytes 1048576
                block group 0 mode 121644 links 1 uid 0 gid 0 rdev 0
                sequence 9 flags 0x0(none)

This mode number 0120000 means it's a symlink.

But the dir item think it's still a regular file:

        item 8 key (264 DIR_INDEX 5) itemoff 3707 itemsize 32
                location key (268 INODE_ITEM 0) type FILE
                transid 13 data_len 0 name_len 2
                name: f4
        item 40 key (264 DIR_ITEM 51821248) itemoff 1573 itemsize 32
                location key (268 INODE_ITEM 0) type FILE
                transid 13 data_len 0 name_len 2
                name: f4

For symlink, we don't set BTRFS_I(inode)->io_tree.ops and leave it
empty, as symlink is only designed to have inlined extent, all handled
by tree block read.  Thus no need to trigger btrfs_submit_bio_hook() for
inline file extent.

However end_bio_extent_readpage() expects tree->ops populated, as it's
reading regular data extent.  This causes NULL pointer dereference.

[FIX]
This patch fixes the problem in two ways:

- Verify inode mode against its dir item when looking up inode
  So in btrfs_lookup_dentry() if we find inode mode mismatch with dir
  item, we error out so that corrupted inode will not be accessed.

- Verify inode mode when getting extent mapping
  Only regular file should have regular or preallocated extent.
  If we found regular/preallocated file extent for symlink or
  the rest, we error out before submitting the read bio.

With this fix that crafted image can be rejected gracefully:

  BTRFS critical (device loop0): inode mode mismatch with dir: inode mode=0121644 btrfs type=7 dir type=1

Reported-by: Yoon Jungyeon <jungyeon@gatech.edu>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=202763
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-03-13 13:55:11 +08:00 committed by David Sterba
parent 496245cac5
commit 6bf9e4bd6a
2 changed files with 47 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
fs/btrfs/inode.c
View File

@ -5437,12 +5437,14 @@ void btrfs_evict_inode(struct inode *inode)
}
/*
* this returns the key found in the dir entry in the location pointer.
* Return the key found in the dir entry in the location pointer, fill @type
* with BTRFS_FT_*, and return 0.
*
* If no dir entries were found, returns -ENOENT.
* If found a corrupted location in dir entry, returns -EUCLEAN.
*/
static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
struct btrfs_key *location)
struct btrfs_key *location, u8 *type)
{
const char *name = dentry->d_name.name;
int namelen = dentry->d_name.len;
@ -5471,6 +5473,8 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
__func__, name, btrfs_ino(BTRFS_I(dir)),
location->objectid, location->type, location->offset);
}
if (!ret)
*type = btrfs_dir_type(path->nodes[0], di);
out:
btrfs_free_path(path);
return ret;
@ -5708,6 +5712,24 @@ static struct inode *new_simple_dir(struct super_block *s,
return inode;
}
static inline u8 btrfs_inode_type(struct inode *inode)
{
/*
* Compile-time asserts that generic FT_* types still match
* BTRFS_FT_* types
*/
BUILD_BUG_ON(BTRFS_FT_UNKNOWN != FT_UNKNOWN);
BUILD_BUG_ON(BTRFS_FT_REG_FILE != FT_REG_FILE);
BUILD_BUG_ON(BTRFS_FT_DIR != FT_DIR);
BUILD_BUG_ON(BTRFS_FT_CHRDEV != FT_CHRDEV);
BUILD_BUG_ON(BTRFS_FT_BLKDEV != FT_BLKDEV);
BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO);
BUILD_BUG_ON(BTRFS_FT_SOCK != FT_SOCK);
BUILD_BUG_ON(BTRFS_FT_SYMLINK != FT_SYMLINK);
return fs_umode_to_ftype(inode->i_mode);
}
struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
{
struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
@ -5715,18 +5737,31 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_root *sub_root = root;
struct btrfs_key location;
u8 di_type = 0;
int index;
int ret = 0;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
ret = btrfs_inode_by_name(dir, dentry, &location);
ret = btrfs_inode_by_name(dir, dentry, &location, &di_type);
if (ret < 0)
return ERR_PTR(ret);
if (location.type == BTRFS_INODE_ITEM_KEY) {
inode = btrfs_iget(dir->i_sb, &location, root, NULL);
if (IS_ERR(inode))
return inode;
/* Do extra check against inode mode with di_type */
if (btrfs_inode_type(inode) != di_type) {
btrfs_crit(fs_info,
"inode mode mismatch with dir: inode mode=0%o btrfs type=%u dir type=%u",
inode->i_mode, btrfs_inode_type(inode),
di_type);
iput(inode);
return ERR_PTR(-EUCLEAN);
}
return inode;
}
@ -6327,24 +6362,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
return ERR_PTR(ret);
}
static inline u8 btrfs_inode_type(struct inode *inode)
{
/*
* Compile-time asserts that generic FT_* types still match
* BTRFS_FT_* types
*/
BUILD_BUG_ON(BTRFS_FT_UNKNOWN != FT_UNKNOWN);
BUILD_BUG_ON(BTRFS_FT_REG_FILE != FT_REG_FILE);
BUILD_BUG_ON(BTRFS_FT_DIR != FT_DIR);
BUILD_BUG_ON(BTRFS_FT_CHRDEV != FT_CHRDEV);
BUILD_BUG_ON(BTRFS_FT_BLKDEV != FT_BLKDEV);
BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO);
BUILD_BUG_ON(BTRFS_FT_SOCK != FT_SOCK);
BUILD_BUG_ON(BTRFS_FT_SYMLINK != FT_SYMLINK);
return fs_umode_to_ftype(inode->i_mode);
}
/*
* utility function to add 'inode' into 'parent_inode' with
* a give name and a given sequence number.
@ -6862,6 +6879,14 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
extent_start = found_key.offset;
if (extent_type == BTRFS_FILE_EXTENT_REG ||
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
/* Only regular file could have regular/prealloc extent */
if (!S_ISREG(inode->vfs_inode.i_mode)) {
ret = -EUCLEAN;
btrfs_crit(fs_info,
"regular/prealloc extent found for non-regular inode %llu",
btrfs_ino(inode));
goto out;
}
extent_end = extent_start +
btrfs_file_extent_num_bytes(leaf, item);

1
fs/btrfs/tests/inode-tests.c
View File

@ -234,6 +234,7 @@ static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
return ret;
}
inode->i_mode = S_IFREG;
BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
BTRFS_I(inode)->location.offset = 0;