7cde28909f
Functions that declare variables totaling more than 100,000 slots will now generate an error. This is only a partial mitigation to the problem, as a sophisticated attack could still chain/nest multiple functions together to consume extremely large amounts of stack. However, this mitigation is still more sophisticated than our peers; both WebGL and glslang are susceptible to similar problems, and in the general case (ES3+ with full flow control) it's intractable. Change-Id: I153c75267c017a23f59fe9e59f6e391197ee6101 Bug: oss-fuzz:40304, oss-fuzz:40694 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/467759 Commit-Queue: John Stiles <johnstiles@google.com> Auto-Submit: John Stiles <johnstiles@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
/*
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* Copyright 2019 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SKSL_DEFINES
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#define SKSL_DEFINES
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#include <cstdint>
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#include "include/core/SkTypes.h"
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#include "include/private/SkTArray.h"
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using SKSL_INT = int64_t;
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using SKSL_FLOAT = float;
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namespace SkSL {
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class Expression;
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class Statement;
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using ComponentArray = SkSTArray<4, int8_t>; // for Swizzles
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using ExpressionArray = SkSTArray<2, std::unique_ptr<Expression>>;
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using StatementArray = SkSTArray<2, std::unique_ptr<Statement>>;
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// Functions larger than this (measured in IR nodes) will not be inlined. This growth factor
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// accounts for the number of calls being inlined--i.e., a function called five times (that is, with
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// five inlining opportunities) would be considered 5x larger than if it were called once. This
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// default threshold value is arbitrary, but tends to work well in practice.
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static constexpr int kDefaultInlineThreshold = 50;
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// A hard upper limit on the number of variable slots allowed in a function/global scope.
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// This is an arbitrary limit, but is needed to prevent code generation from taking unbounded
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// amounts of time or space.
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static constexpr int kVariableSlotLimit = 100000;
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// The SwizzleComponent namespace is used both by the SkSL::Swizzle expression, and the DSL swizzle.
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// This namespace is injected into SkSL::dsl so that `using namespace SkSL::dsl` enables DSL code
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// like `Swizzle(var, X, Y, ONE)` to compile without any extra qualifications.
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namespace SwizzleComponent {
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enum Type : int8_t {
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X = 0, Y = 1, Z = 2, W = 3,
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R = 4, G = 5, B = 6, A = 7,
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S = 8, T = 9, P = 10, Q = 11,
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UL = 12, UT = 13, UR = 14, UB = 15,
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ZERO,
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ONE
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};
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} // namespace SwizzleComponent
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} // namespace SkSL
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#endif
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