linux-kernel - [PATCH v7 0/7] fuse: mounts from non-init user namespaces

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Date:   Mon, 26 Feb 2018 17:52:21 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Miklos Szeredi <mszeredi@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org,
        <linux-fsdevel@...r.kernel.org>, Alban Crequy <alban@...volk.io>,
        Seth Forshee <seth.forshee@...onical.com>,
        Sargun Dhillon <sargun@...gun.me>,
        Dongsu Park <dongsu@...volk.io>,
        "Serge E. Hallyn" <serge@...lyn.com>
Subject: [PATCH v7 0/7] fuse: mounts from non-init user namespaces


This patchset builds on the work by Donsu Park and Seth Forshee and is
reduced to the set of patches that just affect fuse.  The non-fuse
patches are far enough along we can ignore them except possibly for the
question of when does FS_USERNS_MOUNT get set in fuse_fs_type.

Fuse with a block device has been left as an exercise for a later time.

Since v5 I changed the core of this patchset around as the previous
patches were showing signs of bitrot.  Some important explanations were
missing, some important functionality was missing, and xattr handling
was completely absent.

Since v6 I have:
- Removed the failure case from fuse_get_req_nofail_nopages that I
  added.
- Updated fuse to always to use posix_acl_access_xattr_handler, and
  posix_acl_default_xattr_handler, by teaching fuse to set
  ACL_DONT_CACHE when FUSE_POSIX_ACL is not set.

Miklos can you take a look and see what you think?

I think this much of the fuse changes are ready, and as such I would
like to get them in this development cycle if possible.

These changes are also available at:

   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git userns-fuse-v7

Eric W. Biederman (6):
      fuse: Remove the buggy retranslation of pids in fuse_dev_do_read
      fuse: Fail all requests with invalid uids or gids
      fs/posix_acl: Document that get_acl respects ACL_DONT_CACHE
      fuse: Cache a NULL acl when FUSE_GETXATTR returns -ENOSYS
      fuse: Simplfiy the posix acl handling logic.
      fuse: Support fuse filesystems outside of init_user_ns

Seth Forshee (1):
      fuse: Restrict allow_other to the superblock's namespace or a descendant

 fs/fuse/acl.c           | 10 +++++-----
 fs/fuse/cuse.c          |  7 ++++++-
 fs/fuse/dev.c           | 30 +++++++++++++++++-------------
 fs/fuse/dir.c           | 27 +++++++++++++--------------
 fs/fuse/fuse_i.h        | 11 ++++++++---
 fs/fuse/inode.c         | 44 +++++++++++++++++++++++++++++---------------
 fs/fuse/xattr.c         |  6 +-----
 fs/posix_acl.c          |  7 +++++--
 kernel/user_namespace.c |  1 +
 9 files changed, 85 insertions(+), 58 deletions(-)

Eric