Quoting Mika Kuoppala (2020-08-17 20:59:26)
> Our variety of defined gpu commands have the actual
> command id field and possibly length and flags applied.
>
> We did start to apply the mask during initialization of
> the cmd descriptors but forgot to also apply it on comparisons.
>
> Fix comparisons in order to properly deny access with
> associated commands.
>
> v2: fix lri with correct mask (Chris)
>
> References: 926abff21a8f ("drm/i915/cmdparser: Ignore Length operands during command matching")
> Reported-by: Nicolai Stange <nstange@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v5.4+
> Cc: Miroslav Benes <mbenes@xxxxxxx>
> Cc: Takashi Iwai <tiwai@xxxxxxx>
> Cc: Tyler Hicks <tyhicks@xxxxxxxxxxxxx>
> Cc: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
> Cc: Chris Wilson <chris.p.wilson@xxxxxxxxx>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_cmd_parser.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
> index 372354d33f55..5ac4a999f05a 100644
> --- a/drivers/gpu/drm/i915/i915_cmd_parser.c
> +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
> @@ -1204,6 +1204,12 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
> return dst;
> }
>
> +static inline bool cmd_desc_is(const struct drm_i915_cmd_descriptor * const desc,
> + const u32 cmd)
> +{
> + return desc->cmd.value == (cmd & desc->cmd.mask);
We could observe that the mask we need is always -1u << 23, we do use
that info already for the cmd hashing, but more important is that we are
consistent with our use of desc->cmd.mask everywhere else.
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
---------------------------------------------------------------------
Intel Corporation (UK) Limited
Registered No. 1134945 (England)
Registered Office: Pipers Way, Swindon SN3 1RJ
VAT No: 860 2173 47
This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
