202 lines
7.2 KiB
C++
202 lines
7.2 KiB
C++
// Copyright 2014 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_POSIX_PROCESS_INFO_H_
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#define CRASHPAD_UTIL_POSIX_PROCESS_INFO_H_
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <set>
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#include <string>
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#include <vector>
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#include "build/build_config.h"
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#include "util/misc/initialization_state.h"
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#include "util/misc/initialization_state_dcheck.h"
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#if BUILDFLAG(IS_APPLE)
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#include <mach/mach.h>
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#include <sys/sysctl.h>
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#endif
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#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID)
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#include "util/linux/ptrace_connection.h"
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#endif
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namespace crashpad {
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class ProcessInfo {
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public:
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ProcessInfo();
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ProcessInfo(const ProcessInfo&) = delete;
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ProcessInfo& operator=(const ProcessInfo&) = delete;
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~ProcessInfo();
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#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID) || \
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DOXYGEN
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//! \brief Initializes this object with information about the process whose ID
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//! is \a pid using a PtraceConnection \a connection.
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//!
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//! This method must be called successfully prior to calling any other method
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//! in this class. This method may only be called once.
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//!
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//! It is unspecified whether the information that an object of this class
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//! returns is loaded at the time Initialize() is called or subsequently, and
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//! whether this information is cached in the object or not.
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//!
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//! \param[in] connection A connection to the remote process.
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//!
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//! \return `true` on success, `false` on failure with a message logged.
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bool InitializeWithPtrace(PtraceConnection* connection);
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#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) ||
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// BUILDFLAG(IS_ANDROID) || DOXYGEN
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#if BUILDFLAG(IS_APPLE) || DOXYGEN
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//! \brief Initializes this object with information about the process whose ID
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//! is \a pid.
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//!
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//! This method must be called successfully prior to calling any other method
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//! in this class. This method may only be called once.
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//!
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//! It is unspecified whether the information that an object of this class
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//! returns is loaded at the time Initialize() is called or subsequently, and
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//! whether this information is cached in the object or not.
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//!
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//! \param[in] pid The process ID to obtain information for.
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//!
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//! \return `true` on success, `false` on failure with a message logged.
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bool InitializeWithPid(pid_t pid);
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//! \brief Initializes this object with information about a process based on
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//! its Mach task.
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//!
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//! This method serves as a stand-in for InitializeWithPid() and may be called
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//! in its place with the same restrictions and considerations.
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//!
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//! \param[in] task The Mach task to obtain information for.
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//!
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//! \return `true` on success, `false` on failure with an message logged.
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bool InitializeWithTask(task_t task);
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#endif
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//! \return The target task’s process ID.
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pid_t ProcessID() const;
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//! \return The target task’s parent process ID.
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pid_t ParentProcessID() const;
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//! \return The target process’ real user ID as would be returned to it by
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//! `getuid()`.
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uid_t RealUserID() const;
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//! \return The target process’ effective user ID as would be returned to it
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//! by `geteuid()`.
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uid_t EffectiveUserID() const;
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//! \return The target process’ saved set-user ID.
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uid_t SavedUserID() const;
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//! \return the target process’ real group ID as would be returned to it by
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//! `getgid()`.
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gid_t RealGroupID() const;
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//! \return the target process’ effective group ID as would be returned to it
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//! by `getegid()`.
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gid_t EffectiveGroupID() const;
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//! \return The target process’ saved set-group ID.
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gid_t SavedGroupID() const;
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//! \return the target process’ supplementary group list as would be returned
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//! to it by `getgroups()`.
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std::set<gid_t> SupplementaryGroups() const;
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//! \return All groups that the target process claims membership in, including
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//! RealGroupID(), EffectiveGroupID(), SavedGroupID(), and
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//! SupplementaryGroups().
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std::set<gid_t> AllGroups() const;
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//! \brief Determines whether the target process has changed privileges.
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//!
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//! A process is considered to have changed privileges if it has changed its
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//! real, effective, or saved set-user or group IDs with the `setuid()`,
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//! `seteuid()`, `setreuid()`, `setgid()`, `setegid()`, or `setregid()` system
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//! calls since its most recent `execve()`, or if its privileges changed at
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//! `execve()` as a result of executing a setuid or setgid executable.
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bool DidChangePrivileges() const;
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//! \brief Determines the target process’ bitness.
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//!
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//! \return `true` if the target task is a 64-bit process.
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bool Is64Bit() const;
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//! \brief Determines the target process’ start time.
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//!
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//! \param[out] start_time The time that the process started.
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//!
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//! \return `true` on success, with \a start_time set. Otherwise, `false` with
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//! a message logged.
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bool StartTime(timeval* start_time) const;
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//! \brief Obtains the arguments used to launch a process.
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//!
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//! Whether it is possible to obtain this information for a process with
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//! different privileges than the running program is system-dependent.
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//!
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//! \param[out] argv The process’ arguments as passed to its `main()` function
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//! as the \a argv parameter, possibly modified by the process.
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//!
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//! \return `true` on success, with \a argv populated appropriately.
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//! Otherwise, `false` with a message logged.
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//!
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//! \note This function may spuriously return `false` when used to examine a
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//! process that it is calling `exec()`. If examining such a process, call
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//! this function in a retry loop with a small (100ns) delay to avoid an
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//! erroneous assumption that \a pid is not running.
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bool Arguments(std::vector<std::string>* argv) const;
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private:
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#if BUILDFLAG(IS_APPLE)
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kinfo_proc kern_proc_info_;
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#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID)
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// Some members are marked mutable so that they can be lazily initialized by
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// const methods. These are always InitializationState-protected so that
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// multiple successive calls will always produce the same return value and out
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// parameters. This is necessary for intergration with the Snapshot interface.
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// See https://crashpad.chromium.org/bug/9.
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PtraceConnection* connection_;
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std::set<gid_t> supplementary_groups_;
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mutable timeval start_time_;
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pid_t pid_;
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pid_t ppid_;
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uid_t uid_;
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uid_t euid_;
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uid_t suid_;
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gid_t gid_;
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gid_t egid_;
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gid_t sgid_;
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bool is_64_bit_;
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mutable InitializationState start_time_initialized_;
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#endif
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InitializationStateDcheck initialized_;
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_POSIX_PROCESS_INFO_H_
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