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    SubjectRe: [PATCH 2/2] x86: Allow disabling of sys_iopl, sys_ioperm
    On 07/14/2011 01:34 PM, Mike Waychison wrote:
    > In some build environments, it is useful to allow disabling of IO
    > accesses to hardware, without having to rely on CAP_SYS_RAWIO (which is
    > already overloaded to mean many other things). One way that userland
    > has access to IO accesses is via the iopl(2) and ioperm(2) system calls.
    > Allow disabling of these system calls from ever being available via a
    > configuration option, X86_SYS_IOPL. This is implemented by simply
    > stubbing out the system calls and having them return ENOSYS when their
    > functionality is disabled.
    > Note that we default this option to 'y', so that existing kernel configs
    > will continue to support sys_iopl and sys_ioperm as before.

    Wouldn't it be more useful for this to be a sysctl? In particular, like
    many similar things it probably should be a lockable sysctl (three
    states: enabled, disabled, and locked-disabled).

    Making it a compile-time option I'm very skeptical to.


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