Re: [PATCH v7 1/1] s390/zcrypt: Improve zcrypt reply message verification checks

[sashiko-bot@kernel.org]

> Add or improve checks related to buffer sizes and reply sizes to the
> handling of replies from the crypto cards for CCA, EP11 (AP message
> type 6) and ICA (AP type 50) messages. The verification code related
> to reply field length was not designed well and thus firmware
> deficiencies could lead to unexpected behavior in the zcrypt device
> driver. Thus improve the code to more closely inspect especially
> length fields at message replies.
> 
> Rework zcrypt_msgtype6_receive(), zcrypt_msgtype6_receive_ep11() and
> zcrypt_msgtype50_receive() to validate reply lengths more carefully
> before copying data back into the request buffer. Use size_t for
> length calculations, reject inconsistent reply sizes, and add
> defensive handling for short invalid replies. For XCRB replies,
> validate both reply segments and derive the effective message length
> from the covered range instead of trusting only the second segment.
> 
> Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260807101918.31482-2-freude@linux.ibm.com?part=1