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    SubjectRe: [PATCH] New phys_addr() syscall
    Olivier Galibert writes:
    > 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.

    Amen. Let's not jump to restricting things by default.



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