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1 //===-- sanitizer_procmaps_linux.cc ---------------------------------------===//
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2 //
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3 // This file is distributed under the University of Illinois Open Source
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4 // License. See LICENSE.TXT for details.
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5 //
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6 //===----------------------------------------------------------------------===//
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7 //
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8 // Information about the process mappings (Linux-specific parts).
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9 //===----------------------------------------------------------------------===//
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10
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11 #include "sanitizer_platform.h"
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12 #if SANITIZER_LINUX
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13 #include "sanitizer_common.h"
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14 #include "sanitizer_procmaps.h"
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15
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16 namespace __sanitizer {
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17
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18 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
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19 ReadFileToBuffer("/proc/self/maps", &proc_maps->data, &proc_maps->mmaped_size,
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20 &proc_maps->len);
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21 }
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22
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23 static bool IsOneOf(char c, char c1, char c2) {
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24 return c == c1 || c == c2;
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25 }
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26
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27 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
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28 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
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29 if (data_.current >= last) return false;
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30 char *next_line =
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31 (char *)internal_memchr(data_.current, '\n', last - data_.current);
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32 if (next_line == 0)
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33 next_line = last;
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34 // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar
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35 segment->start = ParseHex(&data_.current);
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36 CHECK_EQ(*data_.current++, '-');
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37 segment->end = ParseHex(&data_.current);
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38 CHECK_EQ(*data_.current++, ' ');
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39 CHECK(IsOneOf(*data_.current, '-', 'r'));
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40 segment->protection = 0;
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41 if (*data_.current++ == 'r') segment->protection |= kProtectionRead;
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42 CHECK(IsOneOf(*data_.current, '-', 'w'));
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43 if (*data_.current++ == 'w') segment->protection |= kProtectionWrite;
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44 CHECK(IsOneOf(*data_.current, '-', 'x'));
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45 if (*data_.current++ == 'x') segment->protection |= kProtectionExecute;
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46 CHECK(IsOneOf(*data_.current, 's', 'p'));
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47 if (*data_.current++ == 's') segment->protection |= kProtectionShared;
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48 CHECK_EQ(*data_.current++, ' ');
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49 segment->offset = ParseHex(&data_.current);
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50 CHECK_EQ(*data_.current++, ' ');
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51 ParseHex(&data_.current);
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52 CHECK_EQ(*data_.current++, ':');
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53 ParseHex(&data_.current);
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54 CHECK_EQ(*data_.current++, ' ');
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55 while (IsDecimal(*data_.current)) data_.current++;
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56 // Qemu may lack the trailing space.
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57 // https://github.com/google/sanitizers/issues/160
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58 // CHECK_EQ(*data_.current++, ' ');
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59 // Skip spaces.
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60 while (data_.current < next_line && *data_.current == ' ') data_.current++;
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61 // Fill in the filename.
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62 if (segment->filename) {
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63 uptr len =
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64 Min((uptr)(next_line - data_.current), segment->filename_size - 1);
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65 internal_strncpy(segment->filename, data_.current, len);
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66 segment->filename[len] = 0;
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67 }
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68
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69 data_.current = next_line + 1;
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70 return true;
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71 }
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72
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73 } // namespace __sanitizer
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74
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75 #endif // SANITIZER_LINUX
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