[PATCH] KEYS: trusted: dcp: fix improper sg use with CONFIG_VMAP_STACK=y

[David Gstir]

> On 13.11.2024, at 22:27, David Gstir <david at sigma-star.at> wrote:
> 
> With vmalloc stack addresses enabled (CONFIG_VMAP_STACK=y) DCP trusted
> keys can crash during en- and decryption of the blob encryption key via
> the DCP crypto driver. This is caused by improperly using sg_init_one()
> with vmalloc'd stack buffers (plain_key_blob).
> 
> Fix this by always using kmalloc() for buffers we give to the DCP crypto
> driver.
> 
> Cc: stable at vger.kernel.org # v6.10+
> Fixes: 0e28bf61a5f9 ("KEYS: trusted: dcp: fix leak of blob encryption key")
> Signed-off-by: David Gstir <david at sigma-star.at>

gentle ping.

Thanks!
- David