Commit 08475dab authored by Jason A. Donenfeld's avatar Jason A. Donenfeld
Browse files

kfence: use better stack hash seed 



As of the prior commit, the RNG will have incorporated both a cycle
counter value and RDRAND, in addition to various other environmental
noise. Therefore, using get_random_u32() will supply a stronger seed
than simply using random_get_entropy(). N.B.: random_get_entropy()
should be considered an internal API of random.c and not generally
consumed.

Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarMarco Elver <elver@google.com>
Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
parent f6238499

mm/kfence/core.c

+1 −1
Original line number Diff line number Diff line
@@ -864,7 +864,7 @@ static void kfence_init_enable(void) 


void __init kfence_init(void)

{

	stack_hash_seed = (u32)random_get_entropy();

	stack_hash_seed = get_random_u32();



	/* Setting kfence_sample_interval to 0 on boot disables KFENCE. */

	if (!kfence_sample_interval)