Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 16b369a9 authored by Stephan Mueller's avatar Stephan Mueller Committed by Herbert Xu
Browse files

random: Blocking API for accessing nonblocking_pool 



The added API calls provide a synchronous function call
get_blocking_random_bytes where the caller is blocked until
the nonblocking_pool is initialized.

CC: Andreas Steffen <andreas.steffen@strongswan.org>
CC: Theodore Ts'o <tytso@mit.edu>
CC: Sandy Harris <sandyinchina@gmail.com>
Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1d9de44e

drivers/char/random.c

+12 −0
Original line number Diff line number Diff line
@@ -1244,6 +1244,18 @@ void get_random_bytes(void *buf, int nbytes) 
}

EXPORT_SYMBOL(get_random_bytes);



/*

 * Equivalent function to get_random_bytes with the difference that this

 * function blocks the request until the nonblocking_pool is initialized.

 */

void get_blocking_random_bytes(void *buf, int nbytes)

{

	if (unlikely(nonblocking_pool.initialized == 0))

		wait_event(urandom_init_wait, nonblocking_pool.initialized);

	extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0);

}

EXPORT_SYMBOL(get_blocking_random_bytes);



/*

 * This function will use the architecture-specific hardware random

 * number generator if it is available.  The arch-specific hw RNG will

include/linux/random.h

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ extern void add_input_randomness(unsigned int type, unsigned int code, 
extern void add_interrupt_randomness(int irq, int irq_flags);



extern void get_random_bytes(void *buf, int nbytes);

extern void get_blocking_random_bytes(void *buf, int nbytes);

extern void get_random_bytes_arch(void *buf, int nbytes);

void generate_random_uuid(unsigned char uuid_out[16]);

extern int random_int_secret_init(void);