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    SubjectRe: 8250 serial console fixes -- issue
    Hi!

    > > The serial console driver has a host of issues
    > >
    > > [...]
    > >
    > > - [SECURITY] 'r' should require DCD to be asserted
    > > before outputing characters. Otherwise we talk to
    > > Hayes modem command mode. This allows a non-root
    > > user to re-program the modem and is a major security
    > > issue is people configure calling line identification
    > > or encryption to restrict use of the serial console.
    >
    > How is this possible? A normal user can't produce arbitarily formatted
    > kernel messages, and if they have access to /dev/ttyS they can do what
    > ever they like with the port anyway.

    Maybe not *arbitrary* messages, but any user probably can fake enough
    to
    confuse modem. Name your process \nATD609123456\n and cause it to eat
    all memory, or something like that. OOM killer will print name...


    Pavel
    --
    Thanks, Sharp!
    -
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