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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ | 5 #ifndef SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ |
6 #define SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ | 6 #define SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ |
7 | 7 |
8 #include <sys/types.h> | 8 #include <sys/types.h> |
9 | 9 |
10 #include <string> | 10 #include <string> |
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45 // supported (use Credentials::CanCreateProcessInNewUserNS to check this). | 45 // supported (use Credentials::CanCreateProcessInNewUserNS to check this). |
46 // | 46 // |
47 // pre_exec_delegate and clone_flags fields of LaunchOptions should be nullptr | 47 // pre_exec_delegate and clone_flags fields of LaunchOptions should be nullptr |
48 // and 0, respectively, since this function makes a copy of options and | 48 // and 0, respectively, since this function makes a copy of options and |
49 // overrides them. | 49 // overrides them. |
50 static base::Process LaunchProcess(const base::CommandLine& cmdline, | 50 static base::Process LaunchProcess(const base::CommandLine& cmdline, |
51 const base::LaunchOptions& options); | 51 const base::LaunchOptions& options); |
52 static base::Process LaunchProcess(const std::vector<std::string>& argv, | 52 static base::Process LaunchProcess(const std::vector<std::string>& argv, |
53 const base::LaunchOptions& options); | 53 const base::LaunchOptions& options); |
54 | 54 |
55 // Forks a process in its own PID namespace. The child process is the init | |
56 // process inside of the PID namespace, so if the child needs to fork further, | |
57 // it should call CreateInitProcessReaper, which turns the init process into a | |
58 // reaper process. | |
59 // | |
60 // Otherwise, the child should setup handlers for signals which should | |
61 // terminate the process using InstallDefaultTerminationSignalHandlers or | |
62 // InstallTerminationSignalHandler. This works around the fact that init | |
63 // processes ignore such signals unless they have an explicit handler set. | |
64 // | |
65 // This function requries CAP_SYS_ADMIN. If |drop_capabilities_in_child| is | |
66 // true, then capabilities are dropped in the child. | |
67 static pid_t ForkInNewPidNamespace(bool drop_capabilities_in_child); | |
68 | |
69 // Installs a signal handler for: | 55 // Installs a signal handler for: |
70 // | 56 // |
71 // SIGHUP, SIGINT, SIGABRT, SIGQUIT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2 | 57 // SIGHUP, SIGINT, SIGABRT, SIGQUIT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2 |
72 // | 58 // |
73 // that exits with kDefaultExitCode. These are signals whose default action is | 59 // that exits with kDefaultExitCode. These are signals whose default action is |
74 // to terminate the program (apart from SIGILL, SIGFPE, and SIGSEGV, which | 60 // to terminate the program (apart from SIGILL, SIGFPE, and SIGSEGV, which |
75 // will still terminate the process if e.g. an illegal instruction is | 61 // will still terminate the process if e.g. an illegal instruction is |
76 // encountered, etc.). | 62 // encountered, etc.). |
77 // | 63 // |
78 // If any of these already had a signal handler installed, this function will | 64 // If any of these already had a signal handler installed, this function will |
79 // not override them. | 65 // not override them. |
80 static void InstallDefaultTerminationSignalHandlers(); | 66 static void InstallDefaultTerminationSignalHandlers(); |
81 | 67 |
82 // Installs a signal handler for |sig| which exits with |exit_code|. If a | 68 // Installs a signal handler for |sig| which exits with |exit_code|. If a |
83 // signal handler was already present for |sig|, does nothing and returns | 69 // signal handler was already present for |sig|, does nothing and returns |
84 // false. | 70 // false. |
85 static bool InstallTerminationSignalHandler(int sig, int exit_code); | 71 static bool InstallTerminationSignalHandler(int sig, int exit_code); |
86 #endif // !defined(OS_NACL_NONSFI) | 72 #endif // !defined(OS_NACL_NONSFI) |
87 | 73 |
| 74 // Forks a process in its own PID namespace. The child process is the init |
| 75 // process inside of the PID namespace, so if the child needs to fork further, |
| 76 // it should call CreateInitProcessReaper, which turns the init process into a |
| 77 // reaper process. |
| 78 // |
| 79 // Otherwise, the child should setup handlers for signals which should |
| 80 // terminate the process using InstallDefaultTerminationSignalHandlers or |
| 81 // InstallTerminationSignalHandler. This works around the fact that init |
| 82 // processes ignore such signals unless they have an explicit handler set. |
| 83 // |
| 84 // This function requries CAP_SYS_ADMIN. If |drop_capabilities_in_child| is |
| 85 // true, then capabilities are dropped in the child. |
| 86 static pid_t ForkInNewPidNamespace(bool drop_capabilities_in_child); |
| 87 |
88 // Returns whether the namespace sandbox created a new user, PID, and network | 88 // Returns whether the namespace sandbox created a new user, PID, and network |
89 // namespace. In particular, InNewUserNamespace should return true iff the | 89 // namespace. In particular, InNewUserNamespace should return true iff the |
90 // process was started via this class. | 90 // process was started via this class. |
91 static bool InNewUserNamespace(); | 91 static bool InNewUserNamespace(); |
92 static bool InNewPidNamespace(); | 92 static bool InNewPidNamespace(); |
93 static bool InNewNetNamespace(); | 93 static bool InNewNetNamespace(); |
94 | 94 |
95 private: | 95 private: |
96 DISALLOW_IMPLICIT_CONSTRUCTORS(NamespaceSandbox); | 96 DISALLOW_IMPLICIT_CONSTRUCTORS(NamespaceSandbox); |
97 }; | 97 }; |
98 | 98 |
99 } // namespace sandbox | 99 } // namespace sandbox |
100 | 100 |
101 #endif // SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ | 101 #endif // SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_ |
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