1 //===-- sanitizer_procmaps.h ------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is shared between AddressSanitizer and ThreadSanitizer.
10 //
11 // Information about the process mappings.
12 //===----------------------------------------------------------------------===//
13 #ifndef SANITIZER_PROCMAPS_H
14 #define SANITIZER_PROCMAPS_H
15 
16 #include "sanitizer_platform.h"
17 
18 #if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
19     SANITIZER_OPENBSD || SANITIZER_MAC || SANITIZER_SOLARIS ||  \
20     SANITIZER_FUCHSIA
21 
22 #include "sanitizer_common.h"
23 #include "sanitizer_internal_defs.h"
24 #include "sanitizer_fuchsia.h"
25 #include "sanitizer_linux.h"
26 #include "sanitizer_mac.h"
27 #include "sanitizer_mutex.h"
28 
29 namespace __sanitizer {
30 
31 // Memory protection masks.
32 static const uptr kProtectionRead = 1;
33 static const uptr kProtectionWrite = 2;
34 static const uptr kProtectionExecute = 4;
35 static const uptr kProtectionShared = 8;
36 
37 struct MemoryMappedSegmentData;
38 
39 class MemoryMappedSegment {
40  public:
41   explicit MemoryMappedSegment(char *buff = nullptr, uptr size = 0)
filename(buff)42       : filename(buff), filename_size(size), data_(nullptr) {}
~MemoryMappedSegment()43   ~MemoryMappedSegment() {}
44 
IsReadable()45   bool IsReadable() const { return protection & kProtectionRead; }
IsWritable()46   bool IsWritable() const { return protection & kProtectionWrite; }
IsExecutable()47   bool IsExecutable() const { return protection & kProtectionExecute; }
IsShared()48   bool IsShared() const { return protection & kProtectionShared; }
49 
50   void AddAddressRanges(LoadedModule *module);
51 
52   uptr start;
53   uptr end;
54   uptr offset;
55   char *filename;  // owned by caller
56   uptr filename_size;
57   uptr protection;
58   ModuleArch arch;
59   u8 uuid[kModuleUUIDSize];
60 
61  private:
62   friend class MemoryMappingLayout;
63 
64   // This field is assigned and owned by MemoryMappingLayout if needed
65   MemoryMappedSegmentData *data_;
66 };
67 
68 class MemoryMappingLayout {
69  public:
70   explicit MemoryMappingLayout(bool cache_enabled);
71   ~MemoryMappingLayout();
72   bool Next(MemoryMappedSegment *segment);
73   bool Error() const;
74   void Reset();
75   // In some cases, e.g. when running under a sandbox on Linux, ASan is unable
76   // to obtain the memory mappings. It should fall back to pre-cached data
77   // instead of aborting.
78   static void CacheMemoryMappings();
79 
80   // Adds all mapped objects into a vector.
81   void DumpListOfModules(InternalMmapVectorNoCtor<LoadedModule> *modules);
82 
83  private:
84   void LoadFromCache();
85 
86   MemoryMappingLayoutData data_;
87 };
88 
89 // Returns code range for the specified module.
90 bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end);
91 
92 bool IsDecimal(char c);
93 uptr ParseDecimal(const char **p);
94 bool IsHex(char c);
95 uptr ParseHex(const char **p);
96 
97 }  // namespace __sanitizer
98 
99 #endif
100 #endif  // SANITIZER_PROCMAPS_H
101