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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 "mojo/system/memory.h" | 5 #include "mojo/system/memory.h" |
| 6 | 6 |
| 7 #include <limits> | 7 #include <limits> |
| 8 | 8 |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 | 10 |
| 11 namespace mojo { | 11 namespace mojo { |
| 12 namespace system { | 12 namespace system { |
| 13 | 13 |
| 14 template <size_t size> | 14 template <size_t size> |
| 15 bool VerifyUserPointerForSize(const void* pointer, size_t count) { | 15 bool VerifyUserPointerForSize(const void* pointer, size_t count) { |
| 16 if (count > std::numeric_limits<size_t>::max() / size) | 16 if (count > std::numeric_limits<size_t>::max() / size) |
| 17 return false; | 17 return false; |
| 18 | 18 |
| 19 // TODO(vtl): If running in kernel mode, do a full verification. For now, just | 19 // TODO(vtl): If running in kernel mode, do a full verification. For now, just |
| 20 // check that it's non-null if |size| is nonzero. (A faster user mode | 20 // check that it's non-null if |size| is nonzero. (A faster user mode |
| 21 // implementation is also possible if this check is skipped.) | 21 // implementation is also possible if this check is skipped.) |
| 22 return count == 0 || !!pointer; | 22 return count == 0 || !!pointer; |
| 23 } | 23 } |
| 24 | 24 |
| 25 // Explicitly instantiate the sizes we need. Add instantiations as needed. | 25 // Explicitly instantiate the sizes we need. Add instantiations as needed. |
| 26 template bool VerifyUserPointerForSize<1>(const void*, size_t); | 26 template MOJO_SYSTEM_EXPORT bool VerifyUserPointerForSize<1>( |
| 27 template bool VerifyUserPointerForSize<4>(const void*, size_t); | 27 const void*, size_t); |
| 28 template MOJO_SYSTEM_EXPORT bool VerifyUserPointerForSize<4>( |
| 29 const void*, size_t); |
| 28 | 30 |
| 29 } // namespace system | 31 } // namespace system |
| 30 } // namespace mojo | 32 } // namespace mojo |
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