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

[Jarkko Sakkinen]

On Tue Jan 7, 2025 at 2:56 PM EET, David Gstir wrote:
>
> > 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.

It's done, thanks for reminding, and don't hesitate to do it earlier
if this ever happens again.

>
> Thanks!
> - David

BR, Jarkko