[compiler-rt] [HWASan] symbolize stack overflows (PR #95308)

[Evgenii Stepanov via llvm-commits]

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@@ -311,6 +315,34 @@ class Symbolizer:
     if match:
       self.__last_access_tag = int(match.group(2), 16)
 
+  def process_tag_dump_line(self, line, ignore_tags=False):
+    m = re.match(r'.*?(0x[0-9a-f]+):' + '([ ]*[\[ ][0-9a-f][0-9a-f]\]?)' * 16, line)
+    if m is None:
+      return False
+    addr = m.group(1)
+    tags = m.group(*range(2, 18))
+    fault = [i for i, x in enumerate(tags) if '[' in x]
+    if fault:
+      self.__tag_dump_match_idx = len(self.__tag_dump) + fault[0]
+    self.__tag_dump.extend(int(x.strip(' [').rstrip('] '), 16) for x in tags)
+    return True
+
+  def finish_tag_dump(self):
+    if self.__matched_stack_uas or self.__tag_dump_match_idx is None:
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eugenis wrote:

Note that for heap the logic is different: we prefer short oob over uaf over long oob.
Hard to say which is better for stack.

https://github.com/llvm/llvm-project/pull/95308