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Side by Side Diff: sandbox/linux/services/syscall_wrappers.h

Issue 807213002: Revert "Use the libc clone wrapper in sys_clone." (Closed) Base URL: https://chromium.googlesource.com/chromium/src@master
Patch Set: Created 6 years ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 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_SYSCALL_WRAPPERS_H_ 5 #ifndef SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_
6 #define SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_ 6 #define SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_
7 7
8 #include <sys/types.h> 8 #include <sys/types.h>
9 9
10 #include "sandbox/sandbox_export.h" 10 #include "sandbox/sandbox_export.h"
11 11
12 struct sock_fprog; 12 struct sock_fprog;
13 struct rlimit64; 13 struct rlimit64;
14 14
15 namespace sandbox { 15 namespace sandbox {
16 16
17 // Provide direct system call wrappers for a few common system calls. 17 // Provide direct system call wrappers for a few common system calls.
18 // These are guaranteed to perform a system call and do not rely on things such 18 // These are guaranteed to perform a system call and do not rely on things such
19 // as caching the current pid (c.f. getpid()) unless otherwise specified. 19 // as caching the current pid (c.f. getpid()).
20 20
21 SANDBOX_EXPORT pid_t sys_getpid(void); 21 SANDBOX_EXPORT pid_t sys_getpid(void);
22 22
23 SANDBOX_EXPORT pid_t sys_gettid(void); 23 SANDBOX_EXPORT pid_t sys_gettid(void);
24 24
25 SANDBOX_EXPORT long sys_clone(unsigned long flags); 25 SANDBOX_EXPORT long sys_clone(unsigned long flags);
26 26
27 // |regs| is not supported and must be passed as nullptr. |child_stack| must be 27 // |regs| is not supported and must be passed as nullptr.
28 // nullptr, since otherwise this function cannot safely return. As a
29 // consequence, this function does not support CLONE_VM.
30 //
31 // This function uses the libc clone wrapper (which updates libc's pid cache)
32 // internally, so callers may expect things like getpid() to work correctly
33 // after in both the child and parent.
34 SANDBOX_EXPORT long sys_clone(unsigned long flags, 28 SANDBOX_EXPORT long sys_clone(unsigned long flags,
35 decltype(nullptr) child_stack, 29 void* child_stack,
36 pid_t* ptid, 30 pid_t* ptid,
37 pid_t* ctid, 31 pid_t* ctid,
38 decltype(nullptr) regs); 32 decltype(nullptr) regs);
39 33
40 SANDBOX_EXPORT void sys_exit_group(int status); 34 SANDBOX_EXPORT void sys_exit_group(int status);
41 35
42 // The official system call takes |args| as void* (in order to be extensible), 36 // The official system call takes |args| as void* (in order to be extensible),
43 // but add more typing for the cases that are currently used. 37 // but add more typing for the cases that are currently used.
44 SANDBOX_EXPORT int sys_seccomp(unsigned int operation, 38 SANDBOX_EXPORT int sys_seccomp(unsigned int operation,
45 unsigned int flags, 39 unsigned int flags,
46 const struct sock_fprog* args); 40 const struct sock_fprog* args);
47 41
48 // Some libcs do not expose a prlimit64 wrapper. 42 // Some libcs do not expose a prlimit64 wrapper.
49 SANDBOX_EXPORT int sys_prlimit64(pid_t pid, 43 SANDBOX_EXPORT int sys_prlimit64(pid_t pid,
50 int resource, 44 int resource,
51 const struct rlimit64* new_limit, 45 const struct rlimit64* new_limit,
52 struct rlimit64* old_limit); 46 struct rlimit64* old_limit);
53 47
54 } // namespace sandbox 48 } // namespace sandbox
55 49
56 #endif // SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_ 50 #endif // SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_
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