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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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_SECCOMP_BPF_SYSCALL_H__ | 5 #ifndef SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__ |
6 #define SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__ | 6 #define SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__ |
7 | 7 |
8 #include <signal.h> | |
8 #include <stdint.h> | 9 #include <stdint.h> |
9 | 10 |
10 #include "base/macros.h" | 11 #include "base/macros.h" |
11 #include "sandbox/sandbox_export.h" | 12 #include "sandbox/sandbox_export.h" |
12 | 13 |
13 namespace sandbox { | 14 namespace sandbox { |
14 | 15 |
15 // This purely static class can be used to perform system calls with some | 16 // This purely static class can be used to perform system calls with some |
16 // low-level control. | 17 // low-level control. |
17 class SANDBOX_EXPORT Syscall { | 18 class SANDBOX_EXPORT Syscall { |
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105 | 106 |
106 template <class T0> | 107 template <class T0> |
107 static inline intptr_t Call(int nr, T0 p0) { | 108 static inline intptr_t Call(int nr, T0 p0) { |
108 return Call(nr, p0, 0, 0, 0, 0, 0, 0, 0); | 109 return Call(nr, p0, 0, 0, 0, 0, 0, 0, 0); |
109 } | 110 } |
110 | 111 |
111 static inline intptr_t Call(int nr) { | 112 static inline intptr_t Call(int nr) { |
112 return Call(nr, 0, 0, 0, 0, 0, 0, 0, 0); | 113 return Call(nr, 0, 0, 0, 0, 0, 0, 0, 0); |
113 } | 114 } |
114 | 115 |
116 // Set the registers in |ctx| to match what they would be after a system call | |
117 // returning |ret_val|. |ret_val| must follow the Syscall::Call() convention | |
118 // of being -errno on errors. | |
119 static void PutValueInUcontext(intptr_t ret_val, ucontext_t* ctx); | |
120 | |
115 private: | 121 private: |
116 // This performs system call |nr| with the arguments p0 to p7 from a constant | 122 // This performs system call |nr| with the arguments p0 to p7 from a constant |
117 // userland address, which is for instance observable by seccomp-bpf filters. | 123 // userland address, which is for instance observable by seccomp-bpf filters. |
118 // The constant userland address from which these system calls are made will | 124 // The constant userland address from which these system calls are made will |
119 // be returned if |nr| is passed as -1. | 125 // be returned if |nr| is passed as -1. |
120 // On error, this function will return a value between -1 and -4095 which | 126 // On error, this function will return a value between -1 and -4095 which |
121 // should be interpreted as -errno. | 127 // should be interpreted as -errno. |
122 static intptr_t Call(int nr, | 128 static intptr_t Call(int nr, |
123 intptr_t p0, | 129 intptr_t p0, |
124 intptr_t p1, | 130 intptr_t p1, |
125 intptr_t p2, | 131 intptr_t p2, |
126 intptr_t p3, | 132 intptr_t p3, |
127 intptr_t p4, | 133 intptr_t p4, |
128 intptr_t p5, | 134 intptr_t p5, |
129 intptr_t p6, | 135 intptr_t p6, |
130 intptr_t p7); | 136 intptr_t p7); |
131 | 137 |
138 #if defined(__mips__) | |
139 // This function basically does on MIPS what SandboxSyscall() is doing on | |
140 // other architectures. However, because of specificity of MIPS regarding | |
141 // handelling syscall errors, SandboxSyscall() is made as a wrapper for this | |
mdempsky
2014/07/14 18:10:51
typo: handling
nedeljko
2014/07/15 15:22:16
Done.
| |
142 // function in order for SandboxSyscall() to behave more like on othere | |
mdempsky
2014/07/14 18:10:51
typo: other
nedeljko
2014/07/15 15:22:16
Done.
| |
143 // architectures on places where return value from SandboxSyscall() is used | |
144 // directly (like in most tests). | |
145 // The syscall "nr" is called with arguments that are set in an array on which | |
146 // pointer "args" points to and an information weather there is an error or no | |
147 // is returned to SandboxSyscall() by err_stat. | |
148 static intptr_t SandboxSyscallRaw(int nr, | |
149 const intptr_t* args, | |
150 intptr_t* err_stat); | |
151 #endif // defined(__mips__) | |
152 | |
132 DISALLOW_IMPLICIT_CONSTRUCTORS(Syscall); | 153 DISALLOW_IMPLICIT_CONSTRUCTORS(Syscall); |
133 }; | 154 }; |
134 | 155 |
135 } // namespace sandbox | 156 } // namespace sandbox |
136 | 157 |
137 #endif // SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__ | 158 #endif // SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__ |
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