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random: group sysctl functions

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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: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-02-11 12:53:34 +01:00
parent a6adf8e7a6
commit 0deff3c432
1 changed files with 31 additions and 6 deletions
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37
drivers/char/random.c
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@ -1693,9 +1693,34 @@ const struct file_operations urandom_fops = {
.llseek = noop_llseek, .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> #include <linux/sysctl.h>
static int random_min_urandom_seed = 60; static int sysctl_random_min_urandom_seed = 60;
static int random_write_wakeup_bits = POOL_MIN_BITS; static int sysctl_random_write_wakeup_bits = POOL_MIN_BITS;
static int sysctl_poolsize = POOL_BITS; static int sysctl_poolsize = POOL_BITS;
static char sysctl_bootid[16]; static char sysctl_bootid[16];
@ -1761,14 +1786,14 @@ static struct ctl_table random_table[] = {
}, },
{ {
.procname = "write_wakeup_threshold", .procname = "write_wakeup_threshold",
.data = &random_write_wakeup_bits, .data = &sysctl_random_write_wakeup_bits,
.maxlen = sizeof(int), .maxlen = sizeof(int),
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec, .proc_handler = proc_dointvec,
}, },
{ {
.procname = "urandom_min_reseed_secs", .procname = "urandom_min_reseed_secs",
.data = &random_min_urandom_seed, .data = &sysctl_random_min_urandom_seed,
.maxlen = sizeof(int), .maxlen = sizeof(int),
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec, .proc_handler = proc_dointvec,
@ -1799,4 +1824,4 @@ static int __init random_sysctls_init(void)
return 0; return 0;
} }
device_initcall(random_sysctls_init); device_initcall(random_sysctls_init);
#endif /* CONFIG_SYSCTL */ #endif