| Message ID | 20180510231359.16899-5-mcgrof@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, May 10, 2018 at 04:13:59PM -0700, Luis R. Rodriguez wrote: > The Linux VFS does not allow a way to set append/immuttable ^^^^^^^^^^ Typo, in all 3 patches. > 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> > --- > fs/btrfs/inode.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c > index c4bdb597b323..d9c786be408c 100644 > --- a/fs/btrfs/inode.c > +++ b/fs/btrfs/inode.c > @@ -3933,6 +3933,15 @@ static int btrfs_read_locked_inode(struct inode *inode) > inode->i_op = &btrfs_dir_inode_operations; > break; > case S_IFLNK: > + /* VFS does not allow setting these so must be corruption */ > + if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) { > + ret = -EUCLEAN; > + btrfs_crit(fs_info, > + "corrupt symlink with append/immutable ino=%llu root=%llu\n", no "\n" and please un-indent the string so it fits 80 columns. > + btrfs_ino(BTRFS_I(inode)), > + root->root_key.objectid); > + goto make_bad; I found some error handling issues, before the switch, there's btrfs_free_path and there's one more at the make_bad label. To fix that, please set path = NULL after the first btrfs_free_path, it can handle a NULL when it's called again. Next thing I'm not sure about are the ACLs that get initialized in some cases. There's cache_no_acl() that only resets the inode::i_acl and inode::i_default_acl, so I think this should be called too. Thanks.
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c4bdb597b323..d9c786be408c 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3933,6 +3933,15 @@ static int btrfs_read_locked_inode(struct inode *inode) inode->i_op = &btrfs_dir_inode_operations; break; case S_IFLNK: + /* VFS does not allow setting these so must be corruption */ + if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) { + ret = -EUCLEAN; + btrfs_crit(fs_info, + "corrupt symlink with append/immutable ino=%llu root=%llu\n", + btrfs_ino(BTRFS_I(inode)), + root->root_key.objectid); + goto make_bad; + } inode->i_op = &btrfs_symlink_inode_operations; inode_nohighmem(inode); inode->i_mapping->a_ops = &btrfs_symlink_aops;
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> --- fs/btrfs/inode.c | 9 +++++++++ 1 file changed, 9 insertions(+)