Messages in this thread Patch in this message | | | From | "Jason A. Donenfeld" <> | Subject | [PATCH v2 2/2] kfence: use better stack hash seed | Date | Mon, 26 Sep 2022 23:31:30 +0200 |
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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 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/kfence/core.c b/mm/kfence/core.c index c252081b11df..239b1b4b094f 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -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) -- 2.37.3
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