[compiler-rt] [compiler-rt][msan] Ignore addrinfo padding in getaddrinfo interceptor (PR #219124)

[Jeewoong Kim via llvm-commits]

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@@ -2971,8 +2971,30 @@ INTERCEPTOR(int, getaddrinfo, char *node, char *service,
   if (node) COMMON_INTERCEPTOR_READ_RANGE(ctx, node, internal_strlen(node) + 1);
   if (service)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, service, internal_strlen(service) + 1);
-  if (hints)
-    COMMON_INTERCEPTOR_READ_RANGE(ctx, hints, sizeof(__sanitizer_addrinfo));
+  if (hints) {
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JeewoongKim wrote:

no, I couldn't find a pre-existing `getaddrinfo` test under compiler-rt/test/sanitizer_common.

There are existing tests under compiler-rt/test/msan/ (getaddrinfo.cpp and getaddrinfo-positive.cpp), but neither covers the case where all `addrinfo` members are initialized while only the padding remains uninitialized.

https://github.com/llvm/llvm-project/pull/219124