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ext4: add verifier check for symlink with append/immutable flags

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The Linux VFS does not allow a way to set append/immuttable
attributes to symlinks, this is just not possible. If this is
detected inform the user as the filesystem must be corrupted.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Luis R. Rodriguez 2018-05-13 16:45:56 -04:00 committed by Theodore Ts'o
parent 71fe989961
commit 6390d33bf5
1 changed files with 7 additions and 0 deletions
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7
fs/ext4/inode.c
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@ -4965,6 +4965,13 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
inode->i_op = &ext4_dir_inode_operations;
inode->i_fop = &ext4_dir_operations;
} else if (S_ISLNK(inode->i_mode)) {
/* VFS does not allow setting these so must be corruption */
if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
EXT4_ERROR_INODE(inode,
"immutable or append flags not allowed on symlinks");
ret = -EFSCORRUPTED;
goto bad_inode;
}
if (ext4_encrypted_inode(inode)) {
inode->i_op = &ext4_encrypted_symlink_inode_operations;
ext4_set_aops(inode);