6835d019b2
This patch adds support for handling return addresses signed with
pointer authentication. It simply strips the authentication code
without verifying its correctness, and thus works with both A and B
keys and through key-change boundaries.
Additons:
* DW_CFA_AARCH64_negate_ra_state: new CFA operation.
* RA_SIGN_STATE: new pseudo register.
* Pass the arch to DwarfCfa so that the new op is only executed
on aarch64.
The stripping uses the xpaclri instruction. This is a hint space
instruction which is compatible with pre Armv8.3-A devices. For cases
where it cannot be used, a mask can be set instead.
Test: libunwindstack_test
Without this patch all UnwindTest.* testcases should fail if
compiled with Pointer Authentication.
The tests should be executed with both -mbranch-protection=pac-ret and
pac-ret+leaf flags so that either some or all functions have pointer
authentication instructions.
Change-Id: Id7c3f1d0e2fc7fccb19bd1430826264405a9df7c
75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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*/
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#ifndef _LIBUNWINDSTACK_REGS_ARM64_H
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#define _LIBUNWINDSTACK_REGS_ARM64_H
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#include <stdint.h>
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#include <functional>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MachineArm64.h>
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#include <unwindstack/Regs.h>
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namespace unwindstack {
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// Forward declarations.
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class Memory;
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class RegsArm64 : public RegsImpl<uint64_t> {
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public:
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RegsArm64();
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virtual ~RegsArm64() = default;
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ArchEnum Arch() override final;
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bool SetPcFromReturnAddress(Memory* process_memory) override;
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bool StepIfSignalHandler(uint64_t elf_offset, Elf* elf, Memory* process_memory) override;
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void IterateRegisters(std::function<void(const char*, uint64_t)>) override final;
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uint64_t pc() override;
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uint64_t sp() override;
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void set_pc(uint64_t pc) override;
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void set_sp(uint64_t sp) override;
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void ResetPseudoRegisters() override;
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bool SetPseudoRegister(uint16_t id, uint64_t value) override;
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bool GetPseudoRegister(uint16_t id, uint64_t* value) override;
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bool IsRASigned();
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void SetPACMask(uint64_t mask);
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Regs* Clone() override final;
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static Regs* Read(void* data);
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static Regs* CreateFromUcontext(void* ucontext);
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protected:
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uint64_t pseudo_regs_[Arm64Reg::ARM64_PREG_LAST - Arm64Reg::ARM64_PREG_FIRST];
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uint64_t pac_mask_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_REGS_ARM64_H
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