From: Eric Biggers ebiggers@google.com
commit 11a0b5e0ec8c13bef06f7414f9e914506140d5cb upstream.
The RNDRESEEDCRNG ioctl reseeds the primary_crng from itself, which doesn't make sense. Reseed it from the input_pool instead.
Fixes: d848e5f8e1eb ("random: add new ioctl RNDRESEEDCRNG") Cc: stable@vger.kernel.org Cc: linux-crypto@vger.kernel.org Cc: Andy Lutomirski luto@kernel.org Cc: Jann Horn jannh@google.com Cc: Theodore Ts'o tytso@mit.edu Reviewed-by: Jann Horn jannh@google.com Acked-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Eric Biggers ebiggers@google.com Link: https://lore.kernel.org/r/20210112192818.69921-1-ebiggers@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/char/random.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1972,7 +1972,7 @@ static long random_ioctl(struct file *f, return -EPERM; if (crng_init < 2) return -ENODATA; - crng_reseed(&primary_crng, NULL); + crng_reseed(&primary_crng, &input_pool); crng_global_init_time = jiffies - 1; return 0; default: