[PATCH v3 2/3] KEYS: Reject @desclen values >= KEY_MAX_DESC_SIZE in key_alloc()

[Jarkko Sakkinen]

On Tue, Oct 20, 2026 at 04:38:56AM +0300, Jarkko Sakkinen wrote:
> @desclen in key_alloc() is saved to the 16-bit wide desc_len field in
> struct keyring_index_key.
> 
> Reject @desclen values at or above KEY_MAX_DESC_SIZE with -EINVAL in order
> to match the userspace limit. The constraints inherits from the one byte
> required for the NULL character.
> 
> Cc: stable at vger.kernel.org
> Assisted-by: LLM
> Fixes: f771fde82051 ("keys: Simplify key description management")
> Reviewed-by: David Howells <dhowells at redhat.com>
> Signed-off-by: Jarkko Sakkinen <jarkko at kernel.org>

This is now the only one, which does not have keyutils script in the
commit message so in that sense I think these fixes look pretty good.

Br, Jarkko