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authorChristian Brauner2021-08-23 17:13:47 +0200
committerSteve French2021-09-03 23:29:44 -0500
commitda1e7ada5b62859b3a9d236a44035ae9d8f3f7e1 (patch)
tree8cd6144fa2ad54faf4ad74ba8fac292999577e25 /fs/ksmbd
parent9c849ce86e0fa93a218614eac562ace44053d7ce (diff)
ksmbd: fix lookup on idmapped mounts
It's great that the new in-kernel ksmbd server will support idmapped mounts out of the box! However, lookup is currently broken. Lookup helpers such as lookup_one_len() call inode_permission() internally to ensure that the caller is privileged over the inode of the base dentry they are trying to lookup under. So the permission checking here is currently wrong. Linux v5.15 will gain a new lookup helper lookup_one() that does take idmappings into account. I've added it as part of my patch series to make btrfs support idmapped mounts. The new helper is in linux-next as part of David's (Sterba) btrfs for-next branch as commit c972214c133b ("namei: add mapping aware lookup helper"). I've said it before during one of my first reviews: I would very much recommend adding fstests to [1]. It already seems to have very rudimentary cifs support. There is a completely generic idmapped mount testsuite that supports idmapped mounts. [1]: https://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git/ Cc: Colin Ian King <colin.king@canonical.com> Cc: Steve French <stfrench@microsoft.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Namjae Jeon <namjae.jeon@samsung.com> Cc: Hyunchul Lee <hyc.lee@gmail.com> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: David Sterba <dsterba@suse.com> Cc: linux-cifs@vger.kernel.org Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd')
-rw-r--r--fs/ksmbd/smb2pdu.c18
-rw-r--r--fs/ksmbd/vfs.c43
-rw-r--r--fs/ksmbd/vfs.h3
3 files changed, 37 insertions, 27 deletions
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index d329ea49fa14..a400dd292af1 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -3543,9 +3543,9 @@ static int process_query_dir_entries(struct smb2_query_dir_private *priv)
return -EINVAL;
lock_dir(priv->dir_fp);
- dent = lookup_one_len(priv->d_info->name,
- priv->dir_fp->filp->f_path.dentry,
- priv->d_info->name_len);
+ dent = lookup_one(user_ns, priv->d_info->name,
+ priv->dir_fp->filp->f_path.dentry,
+ priv->d_info->name_len);
unlock_dir(priv->dir_fp);
if (IS_ERR(dent)) {
@@ -5246,7 +5246,9 @@ int smb2_echo(struct ksmbd_work *work)
return 0;
}
-static int smb2_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
+static int smb2_rename(struct ksmbd_work *work,
+ struct ksmbd_file *fp,
+ struct user_namespace *user_ns,
struct smb2_file_rename_info *file_info,
struct nls_table *local_nls)
{
@@ -5310,7 +5312,7 @@ static int smb2_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
if (rc)
goto out;
- rc = ksmbd_vfs_setxattr(file_mnt_user_ns(fp->filp),
+ rc = ksmbd_vfs_setxattr(user_ns,
fp->filp->f_path.dentry,
xattr_stream_name,
NULL, 0, 0);
@@ -5624,6 +5626,7 @@ static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
char *buf)
{
+ struct user_namespace *user_ns;
struct ksmbd_file *parent_fp;
struct dentry *parent;
struct dentry *dentry = fp->filp->f_path.dentry;
@@ -5634,11 +5637,12 @@ static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
return -EACCES;
}
+ user_ns = file_mnt_user_ns(fp->filp);
if (ksmbd_stream_fd(fp))
goto next;
parent = dget_parent(dentry);
- ret = ksmbd_vfs_lock_parent(parent, dentry);
+ ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
if (ret) {
dput(parent);
return ret;
@@ -5655,7 +5659,7 @@ static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
}
}
next:
- return smb2_rename(work, fp,
+ return smb2_rename(work, fp, user_ns,
(struct smb2_file_rename_info *)buf,
work->sess->conn->local_nls);
}
diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c
index aee28ee6b19c..2bb506d1fb32 100644
--- a/fs/ksmbd/vfs.c
+++ b/fs/ksmbd/vfs.c
@@ -69,14 +69,15 @@ static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
*
* the reference count of @parent isn't incremented.
*/
-int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
+int ksmbd_vfs_lock_parent(struct user_namespace *user_ns, struct dentry *parent,
+ struct dentry *child)
{
struct dentry *dentry;
int ret = 0;
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
- dentry = lookup_one_len(child->d_name.name, parent,
- child->d_name.len);
+ dentry = lookup_one(user_ns, child->d_name.name, parent,
+ child->d_name.len);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto out_err;
@@ -102,7 +103,7 @@ int ksmbd_vfs_may_delete(struct user_namespace *user_ns,
int ret;
parent = dget_parent(dentry);
- ret = ksmbd_vfs_lock_parent(parent, dentry);
+ ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
if (ret) {
dput(parent);
return ret;
@@ -137,7 +138,7 @@ int ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
*daccess |= FILE_EXECUTE_LE;
parent = dget_parent(dentry);
- ret = ksmbd_vfs_lock_parent(parent, dentry);
+ ret = ksmbd_vfs_lock_parent(user_ns, parent, dentry);
if (ret) {
dput(parent);
return ret;
@@ -197,6 +198,7 @@ int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
*/
int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
{
+ struct user_namespace *user_ns;
struct path path;
struct dentry *dentry;
int err;
@@ -210,16 +212,16 @@ int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
return err;
}
+ user_ns = mnt_user_ns(path.mnt);
mode |= S_IFDIR;
- err = vfs_mkdir(mnt_user_ns(path.mnt), d_inode(path.dentry),
- dentry, mode);
+ err = vfs_mkdir(user_ns, d_inode(path.dentry), dentry, mode);
if (err) {
goto out;
} else if (d_unhashed(dentry)) {
struct dentry *d;
- d = lookup_one_len(dentry->d_name.name, dentry->d_parent,
- dentry->d_name.len);
+ d = lookup_one(user_ns, dentry->d_name.name, dentry->d_parent,
+ dentry->d_name.len);
if (IS_ERR(d)) {
err = PTR_ERR(d);
goto out;
@@ -582,6 +584,7 @@ int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
*/
int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
{
+ struct user_namespace *user_ns;
struct path path;
struct dentry *parent;
int err;
@@ -601,8 +604,9 @@ int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
return err;
}
+ user_ns = mnt_user_ns(path.mnt);
parent = dget_parent(path.dentry);
- err = ksmbd_vfs_lock_parent(parent, path.dentry);
+ err = ksmbd_vfs_lock_parent(user_ns, parent, path.dentry);
if (err) {
dput(parent);
path_put(&path);
@@ -616,14 +620,12 @@ int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name)
}
if (S_ISDIR(d_inode(path.dentry)->i_mode)) {
- err = vfs_rmdir(mnt_user_ns(path.mnt), d_inode(parent),
- path.dentry);
+ err = vfs_rmdir(user_ns, d_inode(parent), path.dentry);
if (err && err != -ENOTEMPTY)
ksmbd_debug(VFS, "%s: rmdir failed, err %d\n", name,
err);
} else {
- err = vfs_unlink(mnt_user_ns(path.mnt), d_inode(parent),
- path.dentry, NULL);
+ err = vfs_unlink(user_ns, d_inode(parent), path.dentry, NULL);
if (err)
ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name,
err);
@@ -748,7 +750,8 @@ static int __ksmbd_vfs_rename(struct ksmbd_work *work,
if (ksmbd_override_fsids(work))
return -ENOMEM;
- dst_dent = lookup_one_len(dst_name, dst_dent_parent, strlen(dst_name));
+ dst_dent = lookup_one(dst_user_ns, dst_name, dst_dent_parent,
+ strlen(dst_name));
err = PTR_ERR(dst_dent);
if (IS_ERR(dst_dent)) {
pr_err("lookup failed %s [%d]\n", dst_name, err);
@@ -779,6 +782,7 @@ out:
int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
char *newname)
{
+ struct user_namespace *user_ns;
struct path dst_path;
struct dentry *src_dent_parent, *dst_dent_parent;
struct dentry *src_dent, *trap_dent, *src_child;
@@ -808,8 +812,9 @@ int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
trap_dent = lock_rename(src_dent_parent, dst_dent_parent);
dget(src_dent);
dget(dst_dent_parent);
- src_child = lookup_one_len(src_dent->d_name.name, src_dent_parent,
- src_dent->d_name.len);
+ user_ns = file_mnt_user_ns(fp->filp);
+ src_child = lookup_one(user_ns, src_dent->d_name.name, src_dent_parent,
+ src_dent->d_name.len);
if (IS_ERR(src_child)) {
err = PTR_ERR(src_child);
goto out_lock;
@@ -823,7 +828,7 @@ int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
dput(src_child);
err = __ksmbd_vfs_rename(work,
- file_mnt_user_ns(fp->filp),
+ user_ns,
src_dent_parent,
src_dent,
mnt_user_ns(dst_path.mnt),
@@ -1109,7 +1114,7 @@ int ksmbd_vfs_unlink(struct user_namespace *user_ns,
{
int err = 0;
- err = ksmbd_vfs_lock_parent(dir, dentry);
+ err = ksmbd_vfs_lock_parent(user_ns, dir, dentry);
if (err)
return err;
dget(dentry);
diff --git a/fs/ksmbd/vfs.h b/fs/ksmbd/vfs.h
index cb0cba0d5d07..85db50abdb24 100644
--- a/fs/ksmbd/vfs.h
+++ b/fs/ksmbd/vfs.h
@@ -107,7 +107,8 @@ struct ksmbd_kstat {
__le32 file_attributes;
};
-int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child);
+int ksmbd_vfs_lock_parent(struct user_namespace *user_ns, struct dentry *parent,
+ struct dentry *child);
int ksmbd_vfs_may_delete(struct user_namespace *user_ns, struct dentry *dentry);
int ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
struct dentry *dentry, __le32 *daccess);