| // Copyright 2017 The Crashpad Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef CRASHPAD_UTIL_LINUX_SCOPED_PR_SET_PTRACER_H_ |
| #define CRASHPAD_UTIL_LINUX_SCOPED_PR_SET_PTRACER_H_ |
| |
| #include <sys/types.h> |
| |
| #include "base/macros.h" |
| |
| namespace crashpad { |
| |
| class ScopedPrSetPtracer { |
| public: |
| //! \brief Uses `PR_SET_PTRACER` to set \a pid as the caller's ptracer. |
| //! |
| //! `PR_SET_PTRACER` is only supported if the Yama Linux security module (LSM) |
| //! is enabled. Otherwise, `prctl(PR_SET_PTRACER, ...)` fails with `EINVAL`. |
| //! See linux-4.9.20/security/yama/yama_lsm.c yama_task_prctl() and |
| //! linux-4.9.20/kernel/sys.c [sys_]prctl(). |
| //! |
| //! An error message will be logged on failure only if \a may_log is `true` |
| //! and `prctl` does not fail with `EINVAL`; |
| //! |
| //! \param[in] pid The process ID of the process to make the caller's ptracer. |
| //! \param[in] may_log if `true`, this class may log error messages. |
| ScopedPrSetPtracer(pid_t pid, bool may_log); |
| |
| ~ScopedPrSetPtracer(); |
| |
| private: |
| bool success_; |
| bool may_log_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedPrSetPtracer); |
| }; |
| |
| } // namespace crashpad |
| |
| #endif // CRASHPAD_UTIL_LINUX_SCOPED_PR_SET_PTRACER_H_ |