Commit d7992f42 authored by Neil Horman's avatar Neil Horman Committed by Herbert Xu

crypto: ansi_cprng - Force reset on allocation

Pseudo RNGs provide predictable outputs based on input parateters {key, V, DT},
the idea behind them is that only the user should know what the inputs are.
While its nice to have default known values for testing purposes, it seems
dangerous to allow the use of those default values without some sort of safety
measure in place, lest an attacker easily guess the output of the cprng.  This
patch forces the NEED_RESET flag on when allocating a cprng context, so that any
user is forced to reseed it before use.  The defaults can still be used for
testing, but this will prevent their inadvertent use, and be more secure.
Signed-off-by: default avatarNeil Horman <nhorman@redhat.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 54b6a1bd
...@@ -338,7 +338,16 @@ static int cprng_init(struct crypto_tfm *tfm) ...@@ -338,7 +338,16 @@ static int cprng_init(struct crypto_tfm *tfm)
spin_lock_init(&ctx->prng_lock); spin_lock_init(&ctx->prng_lock);
return reset_prng_context(ctx, NULL, DEFAULT_PRNG_KSZ, NULL, NULL); if (reset_prng_context(ctx, NULL, DEFAULT_PRNG_KSZ, NULL, NULL) < 0)
return -EINVAL;
/*
* after allocation, we should always force the user to reset
* so they don't inadvertently use the insecure default values
* without specifying them intentially
*/
ctx->flags |= PRNG_NEED_RESET;
return 0;
} }
static void cprng_exit(struct crypto_tfm *tfm) static void cprng_exit(struct crypto_tfm *tfm)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment