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    SubjectRe: [PATCH] LSM: add static to security_ops variable
    On Sun, Feb 07, 2010 at 07:24:44PM +0800, wzt wzt wrote:
    > security_ops was declared as a global variable, so other drivers or
    > kernel code can easily change its value, like:
    >
    > extern struct security_operations *security_ops;
    > security_ops = NULL;
    >
    > then insmod this driver immediately, it will get an oops. Other evil
    > drivers can aslo fake this variable as extern.

    Evil drivers can do lots of things, if you can load a kernel module on
    the system, all bets are off. Just making this a private variable does
    not mean much.

    What external module are you trying to keep from using this variable?

    thanks,

    greg k-h


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