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    SubjectRe: [PATCH] ELF: implement AT_RANDOM for future glibc use
    On Thu, Oct 02, 2008 at 05:52:58PM -0700, Roland McGrath wrote:
    > I think the safe available AT_* values to use are 25, 26.

    Out of curiosity, why are there gaps? I figure I can include some
    comments in that header to explain the gaps for future AT_* creations.

    > I would configure the size in bytes. Ulrich suggested it be 16 bytes on
    > both 32-bit and 64-bit machines.

    I was trying to make the size compile-time static so I could avoid
    kmalloc'ing a buffer for get_random_bytes(). But maybe avoid that isn't
    sensible?

    As for 16 bytes on both 32bit and 64bit, I was aiming to have 4
    pointer-sized random values. 16 works for 32bit, but I was hoping to
    have 32 on 64bit. Perhaps I am over-estimating?

    -Kees

    --
    Kees Cook
    Ubuntu Security Team


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