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49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
// Copyright 2022 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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// https://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 SANDBOXED_API_SANDBOX2_UTIL_SYSCALL_TRAP_H_
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#define SANDBOXED_API_SANDBOX2_UTIL_SYSCALL_TRAP_H_
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#include <array>
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#include <csignal>
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#include <cstdint>
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namespace sandbox2 {
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// Helper class for intercepting syscalls via SECCCOMP_RET_TRAP.
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class SyscallTrap {
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public:
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static constexpr int kSyscallArgs = 6;
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using Args = std::array<uintptr_t, kSyscallArgs>;
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// Installs the syscall trap handler.
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// Returns false if the handler could not be installed.
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static bool Install(bool (*handler)(int nr, Args args, uintptr_t* result));
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private:
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static void SignalHandler(int nr, siginfo_t* info, void* context);
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explicit SyscallTrap(bool (*handler)(int nr, Args args, uintptr_t* result))
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: handler_(handler) {}
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void InvokeOldAct(int nr, siginfo_t* info, void* context);
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void SignalHandlerImpl(int nr, siginfo_t* info, void* context);
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struct sigaction oldact_;
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bool (*handler_)(int nr, Args args, uintptr_t* result);
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};
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_UTIL_SYSCALL_TRAP_H_
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