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    Subject[PATCH 5/5] CPU Jitter RNG: add read/write sysctls
    Date

    The two added sysctls are read/writable to allow administrators to
    tweak the behavior of the CPU Jitter RNG. Normally, no tweaking is
    neccessary. Though, some overly cautious users may set the default
    to higher values.

    The sysctls are found under /proc/sys/kernel/random with the following
    files:

    jent_memaccessloops -- number of accesses per timing measurement (the
    more memory accesses, the higher the timing variations and thus the
    entropy per measurement)

    jent_osr -- the oversampling rate when generating a random number that
    is injected as noise into the Linux RNG

    Signed-off-by: Stephan Mueller <smueller@chronox.de>
    ---
    drivers/char/random.c | 14 ++++++++++++++
    1 file changed, 14 insertions(+)

    diff --git a/drivers/char/random.c b/drivers/char/random.c
    index 4b2267b..e689956 100644
    --- a/drivers/char/random.c
    +++ b/drivers/char/random.c
    @@ -1717,6 +1717,20 @@ struct ctl_table random_table[] = {
    .proc_handler = proc_dointvec,
    .data = &input_pool.jent_ec.memblocks,
    },
    + {
    + .procname = "jent_memaccessloops",
    + .maxlen = sizeof(int),
    + .mode = 0644,
    + .proc_handler = proc_dointvec,
    + .data = &input_pool.jent_ec.memaccessloops,
    + },
    + {
    + .procname = "jent_osr",
    + .maxlen = sizeof(int),
    + .mode = 0644,
    + .proc_handler = proc_dointvec,
    + .data = &input_pool.jent_ec.osr,
    + },
    { }
    };
    #endif /* CONFIG_SYSCTL */
    --
    1.8.5.3



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