From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com ([134.134.136.65]:22213 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751944AbcD1Ivy convert rfc822-to-8bit (ORCPT ); Thu, 28 Apr 2016 04:51:54 -0400 From: Jani Nikula To: Ville =?utf-8?B?U3lyasOkbMOk?= , Chris Wilson Cc: intel-gfx@lists.freedesktop.org, stable@vger.kernel.org Subject: Re: [Intel-gfx] [PATCH] drm/i915: Validate execbuffer start/length arguments against the target bo In-Reply-To: <20151120153825.GS4437@intel.com> References: <1448032264-31086-1-git-send-email-chris@chris-wilson.co.uk> <20151120153825.GS4437@intel.com> Date: Thu, 28 Apr 2016 11:51:51 +0300 Message-ID: <878tzyi09k.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Sender: stable-owner@vger.kernel.org List-ID: On Fri, 20 Nov 2015, Ville Syrjälä wrote: > On Fri, Nov 20, 2015 at 03:11:04PM +0000, Chris Wilson wrote: >> The offset within and the length of the command sequence to execute are >> supplied by the user with respect to the batch buffer. We should be >> validating that region is wholly contained within the batch buffer; >> make it so. >> >> Reported-by: Ville Syrjälä >> Signed-off-by: Chris Wilson >> Cc: stable@vger.kernel.org >> --- >> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 7 +++++++ >> 1 file changed, 7 insertions(+) >> >> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c >> index a4c243cec4aa..e38284c1b89f 100644 >> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c >> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c >> @@ -1462,6 +1462,13 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, >> /* take note of the batch buffer before we might reorder the lists */ >> batch_obj = eb_get_batch(eb); >> >> + if (args->batch_len > batch_obj->base.size || >> + args->batch_start_offset > batch_obj->base.size - args->batch_len) { > > lgtm. No possibility of overflow doing it that way. > > Reviewed-by: Ville Syrjälä > >> + DRM_DEBUG("Attempting to execute commands from beyond the bounds of the batch object\n"); >> + ret = -EINVAL; >> + goto err; >> + } >> + >> /* Move the objects en-masse into the GTT, evicting if necessary. */ >> need_relocs = (args->flags & I915_EXEC_NO_RELOC) == 0; >> ret = i915_gem_execbuffer_reserve(ring, &eb->vmas, ctx, &need_relocs); >> -- >> 2.6.2 >> >> _______________________________________________ >> Intel-gfx mailing list >> Intel-gfx@lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Jani Nikula, Intel Open Source Technology Center