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authorAndrzej Hajda <andrzej.hajda@intel.com>2023-08-21 18:30:35 +0300
committerRodrigo Vivi <rodrigo.vivi@intel.com>2023-08-30 18:32:48 +0300
commit5eefc5307c983b59344a4cb89009819f580c84fa (patch)
tree04a173a41f8db2f89166a7edd63187083149092c /drivers/hwspinlock
parent3698a75f5a98d0a6599e2878ab25d30a82dd836a (diff)
downloadlinux-5eefc5307c983b59344a4cb89009819f580c84fa.tar.xz
drm/i915: mark requests for GuC virtual engines to avoid use-after-free
References to i915_requests may be trapped by userspace inside a sync_file or dmabuf (dma-resv) and held indefinitely across different proceses. To counter-act the memory leaks, we try to not to keep references from the request past their completion. On the other side on fence release we need to know if rq->engine is valid and points to hw engine (true for non-virtual requests). To make it possible extra bit has been added to rq->execution_mask, for marking virtual engines. Fixes: bcb9aa45d5a0 ("Revert "drm/i915: Hold reference to intel_context over life of i915_request"") Signed-off-by: Chris Wilson <chris.p.wilson@linux.intel.com> Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230821153035.3903006-1-andrzej.hajda@intel.com (cherry picked from commit 280410677af763f3871b93e794a199cfcf6fb580) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers/hwspinlock')
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