The patch below does not apply to the 5.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d5e8782129c22036425f29f9b6a254895482d7bd Mon Sep 17 00:00:00 2001
From: Chris Wilson chris@chris-wilson.co.uk Date: Thu, 15 Oct 2020 12:59:54 +0100 Subject: [PATCH] drm/i915/gem: Support parsing of oversize batches
Matthew Auld noted that on more recent systems (such as the parser for gen9) we may have objects that are larger than expected by the GEM uAPI (i.e. greater than u32). These objects would have incorrect implicit batch lengths, causing the parser to reject them for being incomplete, or worse.
Based on a patch by Matthew Auld.
Reported-by: Matthew Auld matthew.auld@intel.com Fixes: 435e8fc059db ("drm/i915: Allow parsing of unsized batches") Testcase: igt/gem_exec_params/larger-than-life-batch Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Matthew Auld matthew.auld@intel.com Cc: Mika Kuoppala mika.kuoppala@linux.intel.com Cc: Jon Bloomfield jon.bloomfield@intel.com Reviewed-by: Matthew Auld matthew.auld@intel.com Cc: stable@vger.kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/20201015115954.871-1-chris@chr... (cherry picked from commit 57b2d834bf235daab388c3ba12d035c820ae09c6) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 4b09bcd70cf4..1904e6e5ea64 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -287,8 +287,8 @@ struct i915_execbuffer { u64 invalid_flags; /** Set of execobj.flags that are invalid */ u32 context_flags; /** Set of execobj.flags to insert from the ctx */
+ u64 batch_len; /** Length of batch within object */ u32 batch_start_offset; /** Location within object of batch */ - u32 batch_len; /** Length of batch within object */ u32 batch_flags; /** Flags composed for emit_bb_start() */ struct intel_gt_buffer_pool_node *batch_pool; /** pool node for batch buffer */
@@ -871,6 +871,10 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
if (eb->batch_len == 0) eb->batch_len = eb->batch->vma->size - eb->batch_start_offset; + if (unlikely(eb->batch_len == 0)) { /* impossible! */ + drm_dbg(&i915->drm, "Invalid batch length\n"); + return -EINVAL; + }
return 0;
@@ -2424,7 +2428,7 @@ static int eb_parse(struct i915_execbuffer *eb) struct drm_i915_private *i915 = eb->i915; struct intel_gt_buffer_pool_node *pool = eb->batch_pool; struct i915_vma *shadow, *trampoline, *batch; - unsigned int len; + unsigned long len; int err;
if (!eb_use_cmdparser(eb)) { @@ -2449,6 +2453,8 @@ static int eb_parse(struct i915_execbuffer *eb) } else { len += I915_CMD_PARSER_TRAMPOLINE_SIZE; } + if (unlikely(len < eb->batch_len)) /* last paranoid check of overflow */ + return -EINVAL;
if (!pool) { pool = intel_gt_get_buffer_pool(eb->engine->gt, len);