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ksmbd: remove setattr preparations in set_file_basic_info() 

Permission checking and copying over ownership information is the task
of the underlying filesystem not ksmbd. The order is also wrong here.
This modifies the inode before notify_change(). If notify_change() fails
this will have changed ownership nonetheless. All of this is unnecessary
though since the underlying filesystem's ->setattr handler will do all
this (if required) by itself.

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: 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>
This commit is contained in:
Christian Brauner 2021-08-26 10:07:05 +09:00 committed by Steve French
parent eb5784f0c6
commit db7fb6fe3d
1 changed files with 8 additions and 17 deletions
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25
fs/ksmbd/smb2pdu.c
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@ -5440,7 +5440,7 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
{
struct smb2_file_all_info *file_info;
struct iattr attrs;
struct iattr temp_attrs;
struct timespec64 ctime;
struct file *filp;
struct inode *inode;
struct user_namespace *user_ns;
@ -5464,11 +5464,11 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
}
if (file_info->ChangeTime) {
temp_attrs.ia_ctime = ksmbd_NTtimeToUnix(file_info->ChangeTime);
attrs.ia_ctime = temp_attrs.ia_ctime;
attrs.ia_ctime = ksmbd_NTtimeToUnix(file_info->ChangeTime);
ctime = attrs.ia_ctime;
attrs.ia_valid |= ATTR_CTIME;
} else {
temp_attrs.ia_ctime = inode->i_ctime;
ctime = inode->i_ctime;
}
if (file_info->LastWriteTime) {
@ -5507,13 +5507,6 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
rc = 0;
}
/*
* HACK : set ctime here to avoid ctime changed
* when file_info->ChangeTime is zero.
*/
attrs.ia_ctime = temp_attrs.ia_ctime;
attrs.ia_valid |= ATTR_CTIME;
if (attrs.ia_valid) {
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = d_inode(dentry);
@ -5521,14 +5514,12 @@ static int set_file_basic_info(struct ksmbd_file *fp, char *buf,
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EACCES;
rc = setattr_prepare(user_ns, dentry, &attrs);
if (rc)
return -EINVAL;
inode_lock(inode);
setattr_copy(user_ns, inode, &attrs);
attrs.ia_valid &= ~ATTR_CTIME;
rc = notify_change(user_ns, dentry, &attrs, NULL);
if (!rc) {
inode->i_ctime = ctime;
mark_inode_dirty(inode);
}
inode_unlock(inode);
}
return rc;