• Linus Torvalds's avatar
    Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace · 77e40aae
    Linus Torvalds authored
    Pull namespace updates from Eric Biederman:
     "This is a bunch of small changes built against 3.16-rc6.  The most
      significant change for users is the first patch which makes setns
      drmatically faster by removing unneded rcu handling.
      The next chunk of changes are so that "mount -o remount,.." will not
      allow the user namespace root to drop flags on a mount set by the
      system wide root.  Aks this forces read-only mounts to stay read-only,
      no-dev mounts to stay no-dev, no-suid mounts to stay no-suid, no-exec
      mounts to stay no exec and it prevents unprivileged users from messing
      with a mounts atime settings.  I have included my test case as the
      last patch in this series so people performing backports can verify
      this change works correctly.
      The next change fixes a bug in NFS that was discovered while auditing
      nsproxy users for the first optimization.  Today you can oops the
      kernel by reading /proc/fs/nfsfs/{servers,volumes} if you are clever
      with pid namespaces.  I rebased and fixed the build of the
      !CONFIG_NFS_FS case yesterday when a build bot caught my typo.  Given
      that no one to my knowledge bases anything on my tree fixing the typo
      in place seems more responsible that requiring a typo-fix to be
      backported as well.
      The last change is a small semantic cleanup introducing
      /proc/thread-self and pointing /proc/mounts and /proc/net at it.  This
      prevents several kinds of problemantic corner cases.  It is a
      user-visible change so it has a minute chance of causing regressions
      so the change to /proc/mounts and /proc/net are individual one line
      commits that can be trivially reverted.  Unfortunately I lost and
      could not find the email of the original reporter so he is not
      credited.  From at least one perspective this change to /proc/net is a
      refgression fix to allow pthread /proc/net uses that were broken by
      the introduction of the network namespace"
    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
      proc: Point /proc/mounts at /proc/thread-self/mounts instead of /proc/self/mounts
      proc: Point /proc/net at /proc/thread-self/net instead of /proc/self/net
      proc: Implement /proc/thread-self to point at the directory of the current thread
      proc: Have net show up under /proc/<tgid>/task/<tid>
      NFS: Fix /proc/fs/nfsfs/servers and /proc/fs/nfsfs/volumes
      mnt: Add tests for unprivileged remount cases that have found to be faulty
      mnt: Change the default remount atime from relatime to the existing value
      mnt: Correct permission checks in do_remount
      mnt: Move the test for MNT_LOCK_READONLY from change_mount_flags into do_remount
      mnt: Only change user settable mount flags in remount
      namespaces: Use task_lock and not rcu to protect nsproxy
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