[PATCH] arm64/crypto: poly1305 fix a read out-of-bound

[Eric Biggers]

On Tue, Jul 12, 2022 at 12:08:36AM -0700, Eric Biggers wrote:
> 
> Is the special reproducer really needed?  I'd expect this to be reproduced by
> the existing crypto self-tests just by booting a kernel built with both
> CONFIG_KASAN=y and CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y.
> 

Ah, probably the self-tests don't find this because with poly1305 the key is
actually read from the "data", and for the self-tests the data addresses happens
to always be in the kernel direct map, so KASAN doesn't work for it (I think).
Ideally the self-tests would test with kmalloc'ed data buffers too, or a buffer
in vmalloc'ed memory that's directly followed by a guard page.

- Eric