[MSan] Add COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED
Summary:
MSan not implementing COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED looks
like an omission - this macro makes it possible for those intercepted
functions, which libc needs very early, to work before interceptors are
initialized (i.e. before REAL() is usable).
While currently there are no observable practical problems in this
area, changes in libc or in MSan runtime may provoke them. Therefore,
change MSan to work like ASan and TSan already do - use internal
functions in certain interceptors when initialization is not complete.
Reviewers: eugenis, vitalybuka
Reviewed By: eugenis
Subscribers: #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D76969
diff --git a/compiler-rt/lib/msan/msan_interceptors.cpp b/compiler-rt/lib/msan/msan_interceptors.cpp
index 9b1340b..6459c7a 100644
--- a/compiler-rt/lib/msan/msan_interceptors.cpp
+++ b/compiler-rt/lib/msan/msan_interceptors.cpp
@@ -1304,6 +1304,8 @@
ForEachMappedRegion(map, __msan_unpoison); \
} while (false)
+#define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!msan_inited)
+
#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end) \
if (MsanThread *t = GetCurrentThread()) { \
*begin = t->tls_begin(); \
