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    SubjectRe: [PATCH] New phys_addr() syscall
    On Sun, Jul 19, 1998 at 02:24:15PM +0200, Alexander Kjeldaas wrote:
    > I this is only useful for specialized utilities, I suggest you check
    > for capable(CAP_SYS_ADMIN) in the system call.

    Relying of the fact that a process not having the capability is unable
    to know the physical address of a virtual page is nothing but security
    through obscurity. Linux' security is not snake oil.

    Besides, it would require to give a special capability to process
    needing the system call for nothing more than display purposes, which
    increases the number of potential security flaws while not adding real
    security.

    Hence, bad idea.

    OG.


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