// Copyright 2017 The Crashpad Authors. All rights reserved.
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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 CRASHPAD_UTIL_LINUX_SCOPED_PR_SET_PTRACER_H_
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#define CRASHPAD_UTIL_LINUX_SCOPED_PR_SET_PTRACER_H_
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#include <sys/types.h>
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#include "base/macros.h"
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namespace crashpad {
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class ScopedPrSetPtracer {
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public:
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//! \brief Uses `PR_SET_PTRACER` to set \a pid as the caller's ptracer.
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//!
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//! `PR_SET_PTRACER` is only supported if the Yama Linux security module (LSM)
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//! is enabled. Otherwise, `prctl(PR_SET_PTRACER, ...)` fails with `EINVAL`.
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//! See linux-4.9.20/security/yama/yama_lsm.c yama_task_prctl() and
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//! linux-4.9.20/kernel/sys.c [sys_]prctl().
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//!
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//! An error message will be logged on failure only if \a may_log is `true`
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//! and `prctl` does not fail with `EINVAL`;
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//!
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//! \param[in] pid The process ID of the process to make the caller's ptracer.
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//! \param[in] may_log if `true`, this class may log error messages.
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ScopedPrSetPtracer(pid_t pid, bool may_log);
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~ScopedPrSetPtracer();
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private:
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bool success_;
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bool may_log_;
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DISALLOW_COPY_AND_ASSIGN(ScopedPrSetPtracer);
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_LINUX_SCOPED_PR_SET_PTRACER_H_
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