linux-kernel - Re: [PATCH 1/6] drivers: crypto: qce: sha: Restore/save sha1_state/sha256_state with qce_sha

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Date:   Sun, 3 Jan 2021 08:25:01 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     davem@...emloft.net, bjorn.andersson@...aro.org,
        ebiggers@...gle.com, ardb@...nel.org, sivaprak@...eaurora.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] drivers: crypto: qce: sha: Restore/save
 sha1_state/sha256_state with qce_sha_reqctx in export/import

On Fri, Dec 18, 2020 at 10:30:22PM -0500, Thara Gopinath wrote:
> Export and import interfaces save and restore partial transformation
> states. The partial states were being stored and restored in struct
> sha1_state for sha1/hmac(sha1) transformations and sha256_state for
> sha256/hmac(sha256) transformations.This led to a bunch of corner cases
> where improper state was being stored and restored. A few of the corner
> cases that turned up during testing are:
> 
> - wrong byte_count restored if export/import is called twice without h/w
> transaction in between
> - wrong buflen restored back if the pending buffer
> length is exactly the block size.
> - wrong state restored if buffer length is 0.
> 
> To fix these issues, save and restore the entire qce_sha_rctx structure
> instead of parts of it in sha1_state and sha256_state structures.
> This in turn simplifies the export and import apis.
> 
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
>  drivers/crypto/qce/sha.c | 93 ++++------------------------------------
>  1 file changed, 8 insertions(+), 85 deletions(-)

How is this safe when the reqctx structure contains pointers?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt