libsanitizer/sanitizer_common/sanitizer_suppressions.cc

   1 //===-- sanitizer_suppressions.cc -----------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // Suppression parsing/matching code.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "sanitizer_suppressions.h"
  13
  14 #include "sanitizer_allocator_internal.h"
  15 #include "sanitizer_common.h"
  16 #include "sanitizer_flags.h"
  17 #include "sanitizer_file.h"
  18 #include "sanitizer_libc.h"
  19 #include "sanitizer_placement_new.h"
  20
  21 namespace __sanitizer {
  22
  23 SuppressionContext::SuppressionContext(const char *suppression_types[],
  24                                        int suppression_types_num)
  25     : suppression_types_(suppression_types),
  26       suppression_types_num_(suppression_types_num), suppressions_(1),
  27       can_parse_(true) {
  28   CHECK_LE(suppression_types_num_, kMaxSuppressionTypes);
  29   internal_memset(has_suppression_type_, 0, suppression_types_num_);
  30 }
  31
  32 static bool GetPathAssumingFileIsRelativeToExec(const char *file_path,
  33                                                 /*out*/char *new_file_path,
  34                                                 uptr new_file_path_size) {
  35   InternalScopedString exec(kMaxPathLength);
  36   if (ReadBinaryNameCached(exec.data(), exec.size())) {
  37     const char *file_name_pos = StripModuleName(exec.data());
  38     uptr path_to_exec_len = file_name_pos - exec.data();
  39     internal_strncat(new_file_path, exec.data(),
  40                      Min(path_to_exec_len, new_file_path_size - 1));
  41     internal_strncat(new_file_path, file_path,
  42                      new_file_path_size - internal_strlen(new_file_path) - 1);
  43     return true;
  44   }
  45   return false;
  46 }
  47
  48 void SuppressionContext::ParseFromFile(const char *filename) {
  49   if (filename[0] == '\0')
  50     return;
  51
  52 #if !SANITIZER_FUCHSIA
  53   // If we cannot find the file, check if its location is relative to
  54   // the location of the executable.
  55   InternalScopedString new_file_path(kMaxPathLength);
  56   if (!FileExists(filename) && !IsAbsolutePath(filename) &&
  57       GetPathAssumingFileIsRelativeToExec(filename, new_file_path.data(),
  58                                           new_file_path.size())) {
  59     filename = new_file_path.data();
  60   }
  61 #endif  // !SANITIZER_FUCHSIA
  62
  63   // Read the file.
  64   VPrintf(1, "%s: reading suppressions file at %s\n",
  65           SanitizerToolName, filename);
  66   char *file_contents;
  67   uptr buffer_size;
  68   uptr contents_size;
  69   if (!ReadFileToBuffer(filename, &file_contents, &buffer_size,
  70                         &contents_size)) {
  71     Printf("%s: failed to read suppressions file '%s'\n", SanitizerToolName,
  72            filename);
  73     Die();
  74   }
  75
  76   Parse(file_contents);
  77 }
  78
  79 bool SuppressionContext::Match(const char *str, const char *type,
  80                                Suppression **s) {
  81   can_parse_ = false;
  82   if (!HasSuppressionType(type))
  83     return false;
  84   for (uptr i = 0; i < suppressions_.size(); i++) {
  85     Suppression &cur = suppressions_[i];
  86     if (0 == internal_strcmp(cur.type, type) && TemplateMatch(cur.templ, str)) {
  87       *s = &cur;
  88       return true;
  89     }
  90   }
  91   return false;
  92 }
  93
  94 static const char *StripPrefix(const char *str, const char *prefix) {
  95   while (str && *str == *prefix) {
  96     str++;
  97     prefix++;
  98   }
  99   if (!*prefix)
 100     return str;
 101   return 0;
 102 }
 103
 104 void SuppressionContext::Parse(const char *str) {
 105   // Context must not mutate once Match has been called.
 106   CHECK(can_parse_);
 107   const char *line = str;
 108   while (line) {
 109     while (line[0] == ' ' || line[0] == '\t')
 110       line++;
 111     const char *end = internal_strchr(line, '\n');
 112     if (end == 0)
 113       end = line + internal_strlen(line);
 114     if (line != end && line[0] != '#') {
 115       const char *end2 = end;
 116       while (line != end2 &&
 117              (end2[-1] == ' ' || end2[-1] == '\t' || end2[-1] == '\r'))
 118         end2--;
 119       int type;
 120       for (type = 0; type < suppression_types_num_; type++) {
 121         const char *next_char = StripPrefix(line, suppression_types_[type]);
 122         if (next_char && *next_char == ':') {
 123           line = ++next_char;
 124           break;
 125         }
 126       }
 127       if (type == suppression_types_num_) {
 128         Printf("%s: failed to parse suppressions\n", SanitizerToolName);
 129         Die();
 130       }
 131       Suppression s;
 132       s.type = suppression_types_[type];
 133       s.templ = (char*)InternalAlloc(end2 - line + 1);
 134       internal_memcpy(s.templ, line, end2 - line);
 135       s.templ[end2 - line] = 0;
 136       suppressions_.push_back(s);
 137       has_suppression_type_[type] = true;
 138     }
 139     if (end[0] == 0)
 140       break;
 141     line = end + 1;
 142   }
 143 }
 144
 145 uptr SuppressionContext::SuppressionCount() const {
 146   return suppressions_.size();
 147 }
 148
 149 bool SuppressionContext::HasSuppressionType(const char *type) const {
 150   for (int i = 0; i < suppression_types_num_; i++) {
 151     if (0 == internal_strcmp(type, suppression_types_[i]))
 152       return has_suppression_type_[i];
 153   }
 154   return false;
 155 }
 156
 157 const Suppression *SuppressionContext::SuppressionAt(uptr i) const {
 158   CHECK_LT(i, suppressions_.size());
 159   return &suppressions_[i];
 160 }
 161
 162 void SuppressionContext::GetMatched(
 163     InternalMmapVector<Suppression *> *matched) {
 164   for (uptr i = 0; i < suppressions_.size(); i++)
 165     if (atomic_load_relaxed(&suppressions_[i].hit_count))
 166       matched->push_back(&suppressions_[i]);
 167 }
 168
 169 }  // namespace __sanitizer