Commit 0deff3c4 authored by Jason A. Donenfeld's avatar Jason A. Donenfeld
Browse files

random: group sysctl functions 



This pulls all of the sysctl-focused functions into the sixth labeled
section.

No functional changes.

Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
parent a6adf8e7

drivers/char/random.c

+31 −6
Original line number Diff line number Diff line
@@ -1693,9 +1693,34 @@ const struct file_operations urandom_fops = { 
	.llseek = noop_llseek,

};





/********************************************************************

 *

 * Sysctl interface

 * Sysctl interface.

 *

 * These are partly unused legacy knobs with dummy values to not break

 * userspace and partly still useful things. They are usually accessible

 * in /proc/sys/kernel/random/ and are as follows:

 *

 * - boot_id - a UUID representing the current boot.

 *

 * - uuid - a random UUID, different each time the file is read.

 *

 * - poolsize - the number of bits of entropy that the input pool can

 *   hold, tied to the POOL_BITS constant.

 *

 * - entropy_avail - the number of bits of entropy currently in the

 *   input pool. Always <= poolsize.

 *

 * - write_wakeup_threshold - the amount of entropy in the input pool

 *   below which write polls to /dev/random will unblock, requesting

 *   more entropy, tied to the POOL_MIN_BITS constant. It is writable

 *   to avoid breaking old userspaces, but writing to it does not

 *   change any behavior of the RNG.

 *

 * - urandom_min_reseed_secs - fixed to the meaningless value "60".

 *   It is writable to avoid breaking old userspaces, but writing

 *   to it does not change any behavior of the RNG.

 *

 ********************************************************************/
@@ -1703,8 +1728,8 @@ const struct file_operations urandom_fops = { 


#include <linux/sysctl.h>



static int random_min_urandom_seed = 60;

static int random_write_wakeup_bits = POOL_MIN_BITS;

static int sysctl_random_min_urandom_seed = 60;

static int sysctl_random_write_wakeup_bits = POOL_MIN_BITS;

static int sysctl_poolsize = POOL_BITS;

static char sysctl_bootid[16];
@@ -1761,14 +1786,14 @@ static struct ctl_table random_table[] = { 
	},

	{

		.procname	= "write_wakeup_threshold",

		.data		= &random_write_wakeup_bits,

		.data		= &sysctl_random_write_wakeup_bits,

		.maxlen		= sizeof(int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

	{

		.procname	= "urandom_min_reseed_secs",

		.data		= &random_min_urandom_seed,

		.data		= &sysctl_random_min_urandom_seed,

		.maxlen		= sizeof(int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec,
@@ -1799,4 +1824,4 @@ static int __init random_sysctls_init(void) 
	return 0;

}

device_initcall(random_sysctls_init);

#endif	/* CONFIG_SYSCTL */
 
#endif