[PATCH] D112998: [sanitizer_common] Fix readlink error handling in sanitizer_procmaps_solaris.cpp

[Rainer Orth via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rGde6f7252daf5: [sanitizer_common] Fix readlink error handling in sanitizer_procmaps_solaris.cpp (authored by Rich Lowe <richlowe at richlowe.net>, committed by ro).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D112998/new/

https://reviews.llvm.org/D112998

Files:
  compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp


Index: compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp
+++ compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp
@@ -55,7 +55,15 @@
 
     internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",
                       xmapentry->pr_mapname);
-    internal_readlink(proc_path, segment->filename, segment->filename_size);
+    ssize_t sz = internal_readlink(proc_path, segment->filename,
+                                   segment->filename_size - 1);
+
+    // If readlink failed, the map is anonymous.
+    if (sz == -1) {
+      segment->filename[0] = '\0';
+    } else if ((size_t)sz < segment->filename_size)
+      // readlink doesn't NUL-terminate.
+      segment->filename[sz] = '\0';
   }
 
   data_.current += sizeof(prxmap_t);


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