[lkml]   [1997]   [Oct]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: suidpid( UID, credential? ) ? secure IPC? wrote:
    > And lo, Jim Dennis saith unto me:
    > > I was wondering if there is any mechanism for having some
    > > process (a daemon or kernel module perhaps) "touch" a process
    > > and set its *real* UID to a different value.
    > Probably not.
    > > Would it make sense to add a suidpid() call?
    > What happens if, after authentication, the process dies and another
    > process pops up with the same PID? Hard to do nowadays, but I don't
    > believe it's guaranteed impossible, especially given some way of
    > bogging the authenticator down at the right moment...

    I don´t see this problem when the kernel handles this problem:
    - program calls kernel seteuid_auth(authinfo)
    - kernel blocks program and passes authinfo to authenticator
    - authenticator verifies authinfo and passes back status
    - kernel changes euid (or responds with error) of program
    - kernel releases program.

    A process can´t be killed while it is blocked in the kernel.
    The kernel would need to check the authenticator and i.e. signal
    init if the authenticator dies.

    My $0.02.


     \ /
      Last update: 2005-03-22 13:40    [W:0.017 / U:15.864 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site