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    SubjectRe: Potenitial security hole in the kernel
    >Suppose the signal handler modifies this context frame for example by
    >storing into the PC slot address of the panic routine
    >then when handler will exit panic will be called with obvious results.

    You can't execute panic() - or any other kernel function - in user mode.
    The application can write what it likes into its sigcontext, and the worst
    that will hapenn is that it will crash itself.


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