113 lines
5.0 KiB
C++
113 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_
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#define SOURCE_FUZZ_FUZZER_PASS_OBFUSCATE_CONSTANTS_
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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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~FuzzerPassObfuscateConstants() override;
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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_
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