Eric Lee / smarc-fsl-linux-kernel

17 Jul, 2007

3 commits

  • 467e9f4b5   fix create_new_namespaces() return value ... Browse Code »

    dup_mnt_ns() and clone_uts_ns() return NULL on failure. This is wrong,
    create_new_namespaces() uses ERR_PTR() to catch an error. This means that the
    subsequent create_new_namespaces() will hit BUG_ON() in copy_mnt_ns() or
    copy_utsname().

    Modify create_new_namespaces() to also use the errors returned by the
    copy_*_ns routines and not to systematically return ENOMEM.

    [oleg@tv-sign.ru: better changelog]
    Signed-off-by: Cedric Le Goater
    Cc: Serge E. Hallyn
    Cc: Badari Pulavarty
    Cc: Pavel Emelianov
    Cc: Herbert Poetzl
    Cc: Eric W. Biederman
    Cc: Oleg Nesterov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Cedric Le Goater
     
  • 77ec739d8   user namespace: add unshare ... Browse Code »

    This patch enables the unshare of user namespaces.

    It adds a new clone flag CLONE_NEWUSER and implements copy_user_ns() which
    resets the current user_struct and adds a new root user (uid == 0)

    For now, unsharing the user namespace allows a process to reset its
    user_struct accounting and uid 0 in the new user namespace should be contained
    using appropriate means, for instance selinux

    The plan, when the full support is complete (all uid checks covered), is to
    keep the original user's rights in the original namespace, and let a process
    become uid 0 in the new namespace, with full capabilities to the new
    namespace.

    Signed-off-by: Serge E. Hallyn
    Signed-off-by: Cedric Le Goater
    Acked-by: Pavel Emelianov
    Cc: Herbert Poetzl
    Cc: Kirill Korotaev
    Cc: Eric W. Biederman
    Cc: Chris Wright
    Cc: Stephen Smalley
    Cc: James Morris
    Cc: Andrew Morgan
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     
  • acce292c8   user namespace: add the framework ... Browse Code »

    Basically, it will allow a process to unshare its user_struct table,
    resetting at the same time its own user_struct and all the associated
    accounting.

    A new root user (uid == 0) is added to the user namespace upon creation.
    Such root users have full privileges and it seems that theses privileges
    should be controlled through some means (process capabilities ?)

    The unshare is not included in this patch.

    Changes since [try #4]:
    - Updated get_user_ns and put_user_ns to accept NULL, and
    get_user_ns to return the namespace.

    Changes since [try #3]:
    - moved struct user_namespace to files user_namespace.{c,h}

    Changes since [try #2]:
    - removed struct user_namespace* argument from find_user()

    Changes since [try #1]:
    - removed struct user_namespace* argument from find_user()
    - added a root_user per user namespace

    Signed-off-by: Cedric Le Goater
    Signed-off-by: Serge E. Hallyn
    Acked-by: Pavel Emelianov
    Cc: Herbert Poetzl
    Cc: Kirill Korotaev
    Cc: Eric W. Biederman
    Cc: Chris Wright
    Cc: Stephen Smalley
    Cc: James Morris
    Cc: Andrew Morgan
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Cedric Le Goater