Messages in this thread Patch in this message | | | From | Stephan Mueller <> | Subject | [PATCH 5/5] CPU Jitter RNG: add read/write sysctls | Date | Tue, 04 Feb 2014 13:42:15 +0100 |
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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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