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[ubsan] Add preinit initializer for ubsan
Summary: Now that ubsan does function interception (for signals), we need to ensure that ubsan is initialized before any library constructors are called. Otherwise, if a constructor calls sigaction, ubsan will intercept in an unitialized state, which will cause a crash. This patch is a partial revert of r317757, which removed preinit arrays for ubsan. Reviewers: vitalybuka, eugenis, pcc Subscribers: kubamracek, mgorny, llvm-commits, #sanitizers Differential Revision: https://reviews.llvm.org/D42389 llvm-svn: 323249
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//===-- ubsan_init_standalone_preinit.cc ---------------------------------===// | ||
// | ||
// The LLVM Compiler Infrastructure | ||
// | ||
// This file is distributed under the University of Illinois Open Source | ||
// License. See LICENSE.TXT for details. | ||
// | ||
//===----------------------------------------------------------------------===// | ||
// | ||
// Initialization of standalone UBSan runtime. | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include "ubsan_platform.h" | ||
#if !CAN_SANITIZE_UB | ||
#error "UBSan is not supported on this platform!" | ||
#endif | ||
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#include "sanitizer_common/sanitizer_internal_defs.h" | ||
#include "ubsan_init.h" | ||
#include "ubsan_signals_standalone.h" | ||
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#if SANITIZER_CAN_USE_PREINIT_ARRAY | ||
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namespace __ubsan { | ||
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static void PreInitAsStandalone() { | ||
InitAsStandalone(); | ||
InitializeDeadlySignals(); | ||
} | ||
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} // namespace __ubsan | ||
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__attribute__((section(".preinit_array"), used)) void (*__local_ubsan_preinit)( | ||
void) = __ubsan::PreInitAsStandalone; | ||
#endif // SANITIZER_CAN_USE_PREINIT_ARRAY |