https://llvm.org/bugs/show_bug.cgi?id=30810
Bug ID: 30810
Summary: __asan_shadow_memory_dynamic_address is initialized
too late relative to other code
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: unassignedb...@nondot.org
Reporter: dma...@mozilla.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
One of our DLLs contains this global:
bool mmx_enabled = has_cpuid_bits(1u, edx, (1u<<23));
which gets initialized here:
mozglue!`anonymous namespace'::has_cpuid_bits
mozglue!??__Emmx_enabled@sse_private@mozilla@@YAXXZ+0x1f
mozglue!_GLOBAL__sub_I_SSE.cpp+0x22
ucrtbase!_initterm+0x43
mozglue!dllmain_crt_process_attach+0xa7
mozglue!dllmain_crt_dispatch+0x3b
mozglue!dllmain_dispatch+0x59
mozglue!_DllMainCRTStartup+0x1c
ntdll!LdrxCallInitRoutine+0x16
But __asan_shadow_memory_dynamic_address isn't initialized until slightly
later:
mozglue!`dynamic initializer for '__asan_shadow_memory_dynamic_address''+0xb
ucrtbase!_initterm+0x43
mozglue!dllmain_crt_process_attach+0xa7
mozglue!dllmain_crt_dispatch+0x3b
mozglue!dllmain_dispatch+0x59
mozglue!_DllMainCRTStartup+0x1c
ntdll!LdrxCallInitRoutine+0x16
It happens to work on 32-bit builds where a shadow region of 0x30000000 is
hard-coded into has_cpuid_bits, but it crashes on 64-bit builds where
has_cpuid_bits needs to use the dynamic address.
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