linux

iv/linux

History

Miklos Szeredi b10b85fe51 ovl: warn if trusted xattr creation fails

When mounting overlayfs in an unprivileged user namespace, trusted xattr
creation will fail.  This will lead to failures in some file operations,
e.g. in the following situation:

  mkdir lower upper work merged
  mkdir lower/directory
  mount -toverlay -olowerdir=lower,upperdir=upper,workdir=work none merged
  rmdir merged/directory
  mkdir merged/directory

The last mkdir will fail:

  mkdir: cannot create directory 'merged/directory': Input/output error

The cause for these failures is currently extremely non-obvious and hard to
debug.  Hence, warn the user and suggest using the userxattr mount option,
if it is not already supplied and xattr creation fails during the
self-check.

Reported-by: Alois Wohlschlager <alois1@gmx-topmail.de>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

2022-07-27 16:31:30 +02:00

copy_up.c

ovl: use ovl_path_getxattr() wrapper

2022-04-28 16:31:11 +02:00

dir.c

ovl: use ovl_copy_{real,upper}attr() wrappers

2022-04-28 16:31:12 +02:00

export.c

ovl: handle idmappings for layer lookup

2022-04-28 16:31:12 +02:00

file.c

overlayfs update for 5.19