[Bug 206049] alg: skcipher: p8_aes_xts encryption unexpectedly succeeded on test vector "random: len=0 klen=64"; expected_error=-22, cfg="random: inplace may_sleep use_finup src_divs=[<flush>66.99%@+10, 33.1%@alignmask+1155]

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https://bugzilla.kernel.org/show_bug.cgi?id=206049

--- Comment #5 from Erhard F. (erhard_f at mailbox.org) ---
(In reply to Michael Ellerman from comment #3)
> Looks like other implementations check the size, can you try this:
> 
> diff --git a/drivers/crypto/vmx/aes_xts.c b/drivers/crypto/vmx/aes_xts.c
> index d59e736882f6..9fee1b1532a4 100644
> --- a/drivers/crypto/vmx/aes_xts.c
> +++ b/drivers/crypto/vmx/aes_xts.c
> @@ -84,6 +84,9 @@ static int p8_aes_xts_crypt(struct skcipher_request *req,
> int enc)
>       u8 tweak[AES_BLOCK_SIZE];
>       int ret;
>  
> +     if (req->cryptlen < AES_BLOCK_SIZE)
> +             return -EINVAL;
> +
>       if (!crypto_simd_usable() || (req->cryptlen % XTS_BLOCK_SIZE) != 0) {
>               struct skcipher_request *subreq = skcipher_request_ctx(req);
Your patch fixed it, thanks! Applied it on top of kernel 5.4.8 and the
p8_aes_xts error did not show up in subsequent reboots.

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