kfence: use better stack hash seed
authorJason A. Donenfeld <Jason@zx2c4.com>
Mon, 26 Sep 2022 16:32:25 +0000 (18:32 +0200)
committerJason A. Donenfeld <Jason@zx2c4.com>
Thu, 29 Sep 2022 19:37:27 +0000 (21:37 +0200)
commit08475dab7cf5b610ea2420828e97c54f5f370d7d
treec93d3225e580cefccf5609cd9f4fea2e306cefe1
parentf62384995e4cb7703e5295779c44135c5311770d
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>
mm/kfence/core.c