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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
