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Side by Side Diff: sandbox/linux/services/yama.cc

Issue 191673003: Implement ScopedFD in terms of ScopedGeneric. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 9 months 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 #include "sandbox/linux/services/yama.h" 5 #include "sandbox/linux/services/yama.h"
6 6
7 #include <fcntl.h> 7 #include <fcntl.h>
8 #include <sys/prctl.h> 8 #include <sys/prctl.h>
9 #include <sys/stat.h> 9 #include <sys/stat.h>
10 #include <sys/types.h> 10 #include <sys/types.h>
11 #include <unistd.h> 11 #include <unistd.h>
12 12
13 #include "base/basictypes.h" 13 #include "base/basictypes.h"
14 #include "base/file_util.h" 14 #include "base/file_util.h"
15 #include "base/files/scoped_file.h"
15 #include "base/logging.h" 16 #include "base/logging.h"
16 #include "base/posix/eintr_wrapper.h" 17 #include "base/posix/eintr_wrapper.h"
17 18
18 #if !defined(PR_SET_PTRACER_ANY) 19 #if !defined(PR_SET_PTRACER_ANY)
19 #define PR_SET_PTRACER_ANY ((unsigned long)-1) 20 #define PR_SET_PTRACER_ANY ((unsigned long)-1)
20 #endif 21 #endif
21 22
22 #if !defined(PR_SET_PTRACER) 23 #if !defined(PR_SET_PTRACER)
23 #define PR_SET_PTRACER 0x59616d61 24 #define PR_SET_PTRACER 0x59616d61
24 #endif 25 #endif
(...skipping 46 matching lines...) Expand 10 before | Expand all | Expand 10 after
71 } 72 }
72 73
73 // static 74 // static
74 int Yama::GetStatus() { 75 int Yama::GetStatus() {
75 if (!CanAccessProcFS()) { 76 if (!CanAccessProcFS()) {
76 return 0; 77 return 0;
77 } 78 }
78 79
79 static const char kPtraceScopePath[] = "/proc/sys/kernel/yama/ptrace_scope"; 80 static const char kPtraceScopePath[] = "/proc/sys/kernel/yama/ptrace_scope";
80 81
81 int yama_scope = open(kPtraceScopePath, O_RDONLY); 82 base::ScopedFD yama_scope(open(kPtraceScopePath, O_RDONLY));
agl 2014/03/18 06:52:05 HANDLE_EINTR
82 83
83 if (yama_scope < 0) { 84 if (!yama_scope.is_valid()) {
84 const int open_errno = errno; 85 const int open_errno = errno;
85 DCHECK(ENOENT == open_errno); 86 DCHECK(ENOENT == open_errno);
86 // The status is known, yama is not present. 87 // The status is known, yama is not present.
87 return STATUS_KNOWN; 88 return STATUS_KNOWN;
88 } 89 }
89 90
90 file_util::ScopedFDCloser yama_scope_closer(&yama_scope);
91 char yama_scope_value = 0; 91 char yama_scope_value = 0;
92 ssize_t num_read = read(yama_scope, &yama_scope_value, 1); 92 ssize_t num_read = read(yama_scope.get(), &yama_scope_value, 1);
agl 2014/03/18 06:52:05 HANDLE_EINTR
93 PCHECK(1 == num_read); 93 PCHECK(1 == num_read);
94 94
95 switch (yama_scope_value) { 95 switch (yama_scope_value) {
96 case '0': 96 case '0':
97 return STATUS_KNOWN | STATUS_PRESENT; 97 return STATUS_KNOWN | STATUS_PRESENT;
98 case '1': 98 case '1':
99 return STATUS_KNOWN | STATUS_PRESENT | STATUS_ENFORCING; 99 return STATUS_KNOWN | STATUS_PRESENT | STATUS_ENFORCING;
100 case '2': 100 case '2':
101 case '3': 101 case '3':
102 return STATUS_KNOWN | STATUS_PRESENT | STATUS_ENFORCING | 102 return STATUS_KNOWN | STATUS_PRESENT | STATUS_ENFORCING |
103 STATUS_STRICT_ENFORCING; 103 STATUS_STRICT_ENFORCING;
104 default: 104 default:
105 NOTREACHED(); 105 NOTREACHED();
106 return 0; 106 return 0;
107 } 107 }
108 } 108 }
109 109
110 // static 110 // static
111 bool Yama::IsPresent() { return GetStatus() & STATUS_PRESENT; } 111 bool Yama::IsPresent() { return GetStatus() & STATUS_PRESENT; }
112 112
113 // static 113 // static
114 bool Yama::IsEnforcing() { return GetStatus() & STATUS_ENFORCING; } 114 bool Yama::IsEnforcing() { return GetStatus() & STATUS_ENFORCING; }
115 115
116 } // namespace sandbox 116 } // namespace sandbox
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