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https://github.com/KhronosGroup/SPIRV-Tools
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9c4481419e
spirv-fuzz features transformations that should be applicable by construction. Assertions are used to detect when such transformations turn out to be inapplicable. Failures of such assertions indicate bugs in the fuzzer. However, when using the fuzzer at scale (e.g. in ClusterFuzz) reports of these assertion failures create noise, and cause the fuzzer to exit early. This change adds an option whereby inapplicable transformations can be ignored. This reduces noise and allows fuzzing to continue even when a transformation that should be applicable but is not has been erroneously created.
112 lines
5.0 KiB
C++
112 lines
5.0 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SOURCE_FUZZ_FUZZER_PASS_OBFUSCATE_CONSTANTS_H_
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#define SOURCE_FUZZ_FUZZER_PASS_OBFUSCATE_CONSTANTS_H_
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#include <vector>
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#include "source/fuzz/fuzzer_pass.h"
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namespace spvtools {
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namespace fuzz {
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// A fuzzer pass for turning uses of constants into more complex forms.
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// Examples include replacing 'true' with '42 < 52', and replacing '42' with
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// 'a.b.c' if 'a.b.c' is known to hold the value '42'.
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class FuzzerPassObfuscateConstants : public FuzzerPass {
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public:
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FuzzerPassObfuscateConstants(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations,
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bool ignore_inapplicable_transformations);
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void Apply() override;
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private:
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// Applies 0 or more transformations to potentially obfuscate the constant
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// use represented by |constant_use|. The |depth| parameter controls how
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// deeply obfuscation can recurse.
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void ObfuscateConstant(uint32_t depth,
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const protobufs::IdUseDescriptor& constant_use);
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// This method will try to turn |constant_use|, required to be a use of a
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// boolean constant, into a binary expression on scalar constants, which may
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// themselves be recursively obfuscated.
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void ObfuscateBoolConstant(uint32_t depth,
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const protobufs::IdUseDescriptor& constant_use);
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// This method will try to turn |constant_use|, required to be a use of a
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// scalar constant, into the value loaded from a uniform known to have the
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// same value as the constant (if one exists).
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void ObfuscateScalarConstant(uint32_t depth,
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const protobufs::IdUseDescriptor& constant_use);
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// Applies a transformation to replace the boolean constant usage represented
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// by |bool_constant_use| with a binary expression involving
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// |float_constant_id_1| and |float_constant_id_2|, which must not be equal
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// to one another. Possibly further obfuscates the uses of these float
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// constants. The |depth| parameter controls how deeply obfuscation can
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// recurse.
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void ObfuscateBoolConstantViaFloatConstantPair(
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uint32_t depth, const protobufs::IdUseDescriptor& bool_constant_use,
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uint32_t float_constant_id_1, uint32_t float_constant_id_2);
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// Similar to the above, but for signed int constants.
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void ObfuscateBoolConstantViaSignedIntConstantPair(
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uint32_t depth, const protobufs::IdUseDescriptor& bool_constant_use,
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uint32_t signed_int_constant_id_1, uint32_t signed_int_constant_id_2);
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// Similar to the above, but for unsigned int constants.
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void ObfuscateBoolConstantViaUnsignedIntConstantPair(
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uint32_t depth, const protobufs::IdUseDescriptor& bool_constant_use,
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uint32_t unsigned_int_constant_id_1, uint32_t unsigned_int_constant_id_2);
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// A helper method to capture the common parts of the above methods.
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// The method is used to obfuscate the boolean constant usage represented by
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// |bool_constant_use| by replacing it with '|constant_id_1| OP
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// |constant_id_2|', where 'OP' is chosen from either |greater_than_opcodes|
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// or |less_than_opcodes|.
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//
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// The two constant ids must not represent the same value, and thus
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// |greater_than_opcodes| may include 'greater than or equal' opcodes
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// (similar for |less_than_opcodes|).
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void ObfuscateBoolConstantViaConstantPair(
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uint32_t depth, const protobufs::IdUseDescriptor& bool_constant_use,
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const std::vector<SpvOp>& greater_than_opcodes,
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const std::vector<SpvOp>& less_than_opcodes, uint32_t constant_id_1,
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uint32_t constant_id_2, bool first_constant_is_larger);
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// A helper method to determine whether input operand |in_operand_index| of
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// |inst| is the id of a constant, and add an id use descriptor to
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// |candidate_constant_uses| if so. The other parameters are used for id use
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// descriptor construction.
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void MaybeAddConstantIdUse(
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const opt::Instruction& inst, uint32_t in_operand_index,
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uint32_t base_instruction_result_id,
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const std::map<SpvOp, uint32_t>& skipped_opcode_count,
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std::vector<protobufs::IdUseDescriptor>* constant_uses);
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// Returns a vector of unique words that denote constants. Every such constant
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// is used in |FactConstantUniform| and has type with id equal to |type_id|.
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std::vector<std::vector<uint32_t>> GetConstantWordsFromUniformsForType(
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uint32_t type_id);
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_FUZZER_PASS_OBFUSCATE_CONSTANTS_H_
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