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Commit a0626e75 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Theodore Ts'o
Browse files

ext4: check EA value offset when loading 



When loading extended attributes, check each entry's value offset to
make sure it doesn't collide with the entries.

Without this check it is easy to crash the kernel by mounting a
malicious FS containing a file with an EA wherein e_value_offs = 0 and
e_value_size > 0 and then deleting the EA, which corrupts the name
list.

(See the f_ea_value_crash test's FS image in e2fsprogs for an example.)

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
parent 684de574

fs/ext4/xattr.c

+24 −8
Original line number Diff line number Diff line
@@ -190,14 +190,28 @@ ext4_listxattr(struct dentry *dentry, char *buffer, size_t size) 
}



static int

ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end)

ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end,

		       void *value_start)

{

	while (!IS_LAST_ENTRY(entry)) {

		struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry);

	struct ext4_xattr_entry *e = entry;



	while (!IS_LAST_ENTRY(e)) {

		struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e);

		if ((void *)next >= end)

			return -EIO;

		entry = next;

		e = next;

	}



	while (!IS_LAST_ENTRY(entry)) {

		if (entry->e_value_size != 0 &&

		    (value_start + le16_to_cpu(entry->e_value_offs) <

		     (void *)e + sizeof(__u32) ||

		     value_start + le16_to_cpu(entry->e_value_offs) +

		    le32_to_cpu(entry->e_value_size) > end))

			return -EIO;

		entry = EXT4_XATTR_NEXT(entry);

	}



	return 0;

}
@@ -214,7 +228,8 @@ ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh) 
		return -EIO;

	if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh)))

		return -EIO;

	error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size);

	error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size,

				       bh->b_data);

	if (!error)

		set_buffer_verified(bh);

	return error;
@@ -331,7 +346,7 @@ ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 
	header = IHDR(inode, raw_inode);

	entry = IFIRST(header);

	end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;

	error = ext4_xattr_check_names(entry, end);

	error = ext4_xattr_check_names(entry, end, entry);

	if (error)

		goto cleanup;

	error = ext4_xattr_find_entry(&entry, name_index, name,
@@ -463,7 +478,7 @@ ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 
	raw_inode = ext4_raw_inode(&iloc);

	header = IHDR(inode, raw_inode);

	end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;

	error = ext4_xattr_check_names(IFIRST(header), end);

	error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header));

	if (error)

		goto cleanup;

	error = ext4_xattr_list_entries(dentry, IFIRST(header),
@@ -980,7 +995,8 @@ int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 
	is->s.here = is->s.first;

	is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;

	if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {

		error = ext4_xattr_check_names(IFIRST(header), is->s.end);

		error = ext4_xattr_check_names(IFIRST(header), is->s.end,

					       IFIRST(header));

		if (error)

			return error;

		/* Find the named attribute. */