llvm-dwarfdump: Make the "is debug info section" heuristic stricter so it doesn't accidentaly picks up the wrong section.

Also add some validation code to the aranges section parser.

Fixes PR10926.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139701 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 15 insertions, 4 deletions

diff --git a/lib/DebugInfo/DWARFDebugArangeSet.cpp b/lib/DebugInfo/DWARFDebugArangeSet.cpp
index a3e2e62104..148b770bd8 100644
--- a/lib/DebugInfo/DWARFDebugArangeSet.cpp
+++ b/lib/DebugInfo/DWARFDebugArangeSet.cpp
@@ -72,6 +72,13 @@ DWARFDebugArangeSet::extract(DataExtractor data, uint32_t *offset_ptr) {
     Header.AddrSize = data.getU8(offset_ptr);
     Header.SegSize = data.getU8(offset_ptr);
 
+    // Perform basic validation of the header fields.
+    if (!data.isValidOffsetForDataOfSize(Offset, Header.Length) ||
+        (Header.AddrSize != 4 && Header.AddrSize != 8)) {
+      clear();
+      return false;
+    }
+
     // The first tuple following the header in each set begins at an offset
     // that is a multiple of the size of a single tuple (that is, twice the
     // size of an address). The header is padded, if necessary, to the
diff --git a/tools/llvm-dwarfdump/llvm-dwarfdump.cpp b/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
index 076dcd10fb..ef9a47b959 100644
--- a/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
+++ b/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
@@ -62,13 +62,17 @@ static void DumpInput(const StringRef &Filename) {
     i->getName(name);
     StringRef data;
     i->getContents(data);
-    if (name.endswith("debug_info"))
+
+    if (name.startswith("__DWARF,"))
+      name = name.substr(8); // Skip "__DWARF," prefix.
+    name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
+    if (name == "debug_info")
       DebugInfoSection = data;
-    else if (name.endswith("debug_abbrev"))
+    else if (name == "debug_abbrev")
       DebugAbbrevSection = data;
-    else if (name.endswith("debug_line"))
+    else if (name == "debug_line")
       DebugLineSection = data;
-    else if (name.endswith("debug_aranges"))
+    else if (name == "debug_aranges")
       DebugArangesSection = data;
   }