From: Amir Goldstein amir73il@gmail.com
commit b306e90ffabdaa7e3b3350dbcd19b7663e71ab17 upstream.
Underlying fs doesn't remove privs because copy_range/remap_range are called with privileged mounter credentials.
This fixes some failures in fstest generic/673.
Fixes: 8ede205541ff ("ovl: add reflink/copyfile/dedup support") Acked-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Christian Brauner (Microsoft) brauner@kernel.org Signed-off-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/overlayfs/file.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)
--- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -687,14 +687,23 @@ static loff_t ovl_copyfile(struct file * const struct cred *old_cred; loff_t ret;
+ inode_lock(inode_out); + if (op != OVL_DEDUPE) { + /* Update mode */ + ovl_copyattr(ovl_inode_real(inode_out), inode_out); + ret = file_remove_privs(file_out); + if (ret) + goto out_unlock; + } + ret = ovl_real_fdget(file_out, &real_out); if (ret) - return ret; + goto out_unlock;
ret = ovl_real_fdget(file_in, &real_in); if (ret) { fdput(real_out); - return ret; + goto out_unlock; }
old_cred = ovl_override_creds(file_inode(file_out)->i_sb); @@ -723,6 +732,9 @@ static loff_t ovl_copyfile(struct file * fdput(real_in); fdput(real_out);
+out_unlock: + inode_unlock(inode_out); + return ret; }