lkml.org 
[lkml]   [2018]   [May]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    Subject[REVIEW][PATCH 0/6] Wrapping up the vfs support for unprivileged mounts

    Very slowly the work has been progressing to ensure the vfs has the
    necessary support for mounting filesystems without privilege.

    This patchset contains one more core piece of that work, ensuring a few
    more operations that would write back an inode and confuse an exisiting
    filesystem are denied.

    The rest of the changes actually enable userns root to do things with
    filesystems that the userns root has mounted. Most of these have been
    waiting in the wings a long time, held back because I wanted the core
    of the patchset to be solid before I started allowing additional
    behavor.

    It is definitely time for these changes so the effect of s_user_ns
    becomes less theoretical.

    The change to allow mknod is new, but consistent with everything else
    and harmless as device nodes on filesystems mounted without privilege
    are ignored.

    Unless problems show up in the during review I plan to merge these changes.

    These changes are also available at:
    git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git userns-test

    Eric W. Biederman (5):
    vfs: Don't allow changing the link count of an inode with an invalid uid or gid
    vfs: Allow userns root to call mknod on owned filesystems.
    fs: Allow superblock owner to replace invalid owners of inodes
    fs: Allow superblock owner to access do_remount_sb()
    capabilities: Allow privileged user in s_user_ns to set security.* xattrs

    Seth Forshee (1):
    fs: Allow CAP_SYS_ADMIN in s_user_ns to freeze and thaw filesystems

    fs/attr.c | 36 ++++++++++++++++++++++++++++--------
    fs/ioctl.c | 4 ++--
    fs/namei.c | 16 ++++++++++++----
    fs/namespace.c | 4 ++--
    security/commoncap.c | 8 ++++++--
    5 files changed, 50 insertions(+), 18 deletions(-)

    Eric

    \
     
     \ /
      Last update: 2018-05-24 01:23    [W:3.074 / U:0.380 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site