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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: Marco Elver <elver@google.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-09-26 18:32:25 +02:00
parent f62384995e
commit 08475dab7c
1 changed files with 1 additions and 1 deletions
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2
mm/kfence/core.c
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@ -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)