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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> |
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| 72 } | 72 } |
| 73 | 73 |
| 74 // static | 74 // static |
| 75 int Yama::GetStatus() { | 75 int Yama::GetStatus() { |
| 76 if (!CanAccessProcFS()) { | 76 if (!CanAccessProcFS()) { |
| 77 return 0; | 77 return 0; |
| 78 } | 78 } |
| 79 | 79 |
| 80 static const char kPtraceScopePath[] = "/proc/sys/kernel/yama/ptrace_scope"; | 80 static const char kPtraceScopePath[] = "/proc/sys/kernel/yama/ptrace_scope"; |
| 81 | 81 |
| 82 base::ScopedFD yama_scope(open(kPtraceScopePath, O_RDONLY)); | 82 base::ScopedFD yama_scope(HANDLE_EINTR(open(kPtraceScopePath, O_RDONLY))); |
| 83 | 83 |
| 84 if (!yama_scope.is_valid()) { | 84 if (!yama_scope.is_valid()) { |
| 85 const int open_errno = errno; | 85 const int open_errno = errno; |
| 86 DCHECK(ENOENT == open_errno); | 86 DCHECK(ENOENT == open_errno); |
| 87 // The status is known, yama is not present. | 87 // The status is known, yama is not present. |
| 88 return STATUS_KNOWN; | 88 return STATUS_KNOWN; |
| 89 } | 89 } |
| 90 | 90 |
| 91 char yama_scope_value = 0; | 91 char yama_scope_value = 0; |
| 92 ssize_t num_read = HANDLE_EINTR(read(yama_scope.get(), &yama_scope_value, 1)); | 92 ssize_t num_read = HANDLE_EINTR(read(yama_scope.get(), &yama_scope_value, 1)); |
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| 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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