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-rw-r--r--abs/extra/llvm/msan-prevent-initialization-failure-with-newer-glibc.patch103
1 files changed, 103 insertions, 0 deletions
diff --git a/abs/extra/llvm/msan-prevent-initialization-failure-with-newer-glibc.patch b/abs/extra/llvm/msan-prevent-initialization-failure-with-newer-glibc.patch
new file mode 100644
index 0000000..57387a6
--- /dev/null
+++ b/abs/extra/llvm/msan-prevent-initialization-failure-with-newer-glibc.patch
@@ -0,0 +1,103 @@
+Index: lib/msan/msan_interceptors.cc
+===================================================================
+--- lib/msan/msan_interceptors.cc (revision 282231)
++++ lib/msan/msan_interceptors.cc (revision 282232)
+@@ -64,6 +64,23 @@
+ return in_interceptor_scope;
+ }
+
++static uptr allocated_for_dlsym;
++static const uptr kDlsymAllocPoolSize = 1024;
++static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
++
++static bool IsInDlsymAllocPool(const void *ptr) {
++ uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
++ return off < sizeof(alloc_memory_for_dlsym);
++}
++
++static void *AllocateFromLocalPool(uptr size_in_bytes) {
++ uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
++ void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
++ allocated_for_dlsym += size_in_words;
++ CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
++ return mem;
++}
++
+ #define ENSURE_MSAN_INITED() do { \
+ CHECK(!msan_init_is_running); \
+ if (!msan_inited) { \
+@@ -227,7 +244,7 @@
+
+ INTERCEPTOR(void, free, void *ptr) {
+ GET_MALLOC_STACK_TRACE;
+- if (!ptr) return;
++ if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
+ MsanDeallocate(&stack, ptr);
+ }
+
+@@ -234,7 +251,7 @@
+ #if !SANITIZER_FREEBSD
+ INTERCEPTOR(void, cfree, void *ptr) {
+ GET_MALLOC_STACK_TRACE;
+- if (!ptr) return;
++ if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
+ MsanDeallocate(&stack, ptr);
+ }
+ #define MSAN_MAYBE_INTERCEPT_CFREE INTERCEPT_FUNCTION(cfree)
+@@ -907,27 +924,29 @@
+
+ INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
+ GET_MALLOC_STACK_TRACE;
+- if (UNLIKELY(!msan_inited)) {
++ if (UNLIKELY(!msan_inited))
+ // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
+- const SIZE_T kCallocPoolSize = 1024;
+- static uptr calloc_memory_for_dlsym[kCallocPoolSize];
+- static SIZE_T allocated;
+- SIZE_T size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize;
+- void *mem = (void*)&calloc_memory_for_dlsym[allocated];
+- allocated += size_in_words;
+- CHECK(allocated < kCallocPoolSize);
+- return mem;
+- }
++ return AllocateFromLocalPool(nmemb * size);
+ return MsanCalloc(&stack, nmemb, size);
+ }
+
+ INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
+ GET_MALLOC_STACK_TRACE;
++ if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
++ uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
++ uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
++ void *new_ptr = AllocateFromLocalPool(size);
++ internal_memcpy(new_ptr, ptr, copy_size);
++ return new_ptr;
++ }
+ return MsanReallocate(&stack, ptr, size, sizeof(u64), false);
+ }
+
+ INTERCEPTOR(void *, malloc, SIZE_T size) {
+ GET_MALLOC_STACK_TRACE;
++ if (UNLIKELY(!msan_inited))
++ // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
++ return AllocateFromLocalPool(size);
+ return MsanReallocate(&stack, nullptr, size, sizeof(u64), false);
+ }
+
+Index: lib/asan/asan_malloc_linux.cc
+===================================================================
+--- lib/asan/asan_malloc_linux.cc (revision 282231)
++++ lib/asan/asan_malloc_linux.cc (revision 282232)
+@@ -78,7 +78,11 @@
+ if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
+ uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
+ uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
+- void *new_ptr = asan_malloc(size, &stack);
++ void *new_ptr;
++ if (UNLIKELY(!asan_inited))
++ new_ptr = AllocateFromLocalPool(size);
++ else
++ new_ptr = asan_malloc(size, &stack);
+ internal_memcpy(new_ptr, ptr, copy_size);
+ return new_ptr;
+ }