[compiler-rt] 75e6133 - [interception] Implement interception on AIX (#138608)
via llvm-commits
llvm-commits at lists.llvm.org
Mon May 26 08:40:24 PDT 2025
Author: Jake Egan
Date: 2025-05-26T11:40:20-04:00
New Revision: 75e61333f0838d742fcd71907526d72e7d66c4e0
URL: https://github.com/llvm/llvm-project/commit/75e61333f0838d742fcd71907526d72e7d66c4e0
DIFF: https://github.com/llvm/llvm-project/commit/75e61333f0838d742fcd71907526d72e7d66c4e0.diff
LOG: [interception] Implement interception on AIX (#138608)
Implement AIX specific interception functions.
Issue: https://github.com/llvm/llvm-project/issues/138916
Added:
compiler-rt/lib/interception/interception_aix.cpp
compiler-rt/lib/interception/interception_aix.h
Modified:
compiler-rt/lib/interception/CMakeLists.txt
compiler-rt/lib/interception/interception.h
Removed:
################################################################################
diff --git a/compiler-rt/lib/interception/CMakeLists.txt b/compiler-rt/lib/interception/CMakeLists.txt
index fe7fa27fbc78b..57c8c8ba20141 100644
--- a/compiler-rt/lib/interception/CMakeLists.txt
+++ b/compiler-rt/lib/interception/CMakeLists.txt
@@ -1,6 +1,7 @@
# Build for the runtime interception helper library.
set(INTERCEPTION_SOURCES
+ interception_aix.cpp
interception_linux.cpp
interception_mac.cpp
interception_win.cpp
@@ -9,6 +10,7 @@ set(INTERCEPTION_SOURCES
set(INTERCEPTION_HEADERS
interception.h
+ interception_aix.h
interception_linux.h
interception_mac.h
interception_win.h
diff --git a/compiler-rt/lib/interception/interception.h b/compiler-rt/lib/interception/interception.h
index 25480120e7ad6..9fe7d3db308bf 100644
--- a/compiler-rt/lib/interception/interception.h
+++ b/compiler-rt/lib/interception/interception.h
@@ -19,7 +19,7 @@
#if !SANITIZER_LINUX && !SANITIZER_FREEBSD && !SANITIZER_APPLE && \
!SANITIZER_NETBSD && !SANITIZER_WINDOWS && !SANITIZER_FUCHSIA && \
- !SANITIZER_SOLARIS && !SANITIZER_HAIKU
+ !SANITIZER_SOLARIS && !SANITIZER_HAIKU && !SANITIZER_AIX
# error "Interception doesn't work on this operating system."
#endif
@@ -168,6 +168,16 @@ const interpose_substitution substitution_##func_name[] \
extern "C" ret_type func(__VA_ARGS__);
# define DECLARE_WRAPPER_WINAPI(ret_type, func, ...) \
extern "C" __declspec(dllimport) ret_type __stdcall func(__VA_ARGS__);
+#elif SANITIZER_AIX
+# define WRAP(x) __interceptor_##x
+# define TRAMPOLINE(x) WRAP(x)
+// # define WRAPPER_NAME(x) "__interceptor_" #x
+# define INTERCEPTOR_ATTRIBUTE __attribute__((visibility("default")))
+// AIX's linker will not select the weak symbol, so don't use weak for the
+// interceptors.
+# define DECLARE_WRAPPER(ret_type, func, ...) \
+ extern "C" ret_type func(__VA_ARGS__) \
+ __attribute__((alias("__interceptor_" #func), visibility("default")));
#elif !SANITIZER_FUCHSIA // LINUX, FREEBSD, NETBSD, SOLARIS
# define INTERCEPTOR_ATTRIBUTE __attribute__((visibility("default")))
# if ASM_INTERCEPTOR_TRAMPOLINE_SUPPORT
@@ -367,12 +377,17 @@ inline void DoesNotSupportStaticLinking() {}
#define INCLUDED_FROM_INTERCEPTION_LIB
-#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
+#if SANITIZER_AIX
+# include "interception_aix.h"
+# define INTERCEPT_FUNCTION(func) INTERCEPT_FUNCTION_AIX(func)
+# define INTERCEPT_FUNCTION_VER(func, symver) INTERCEPT_FUNCTION_AIX(func)
+
+#elif SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD || \
SANITIZER_SOLARIS || SANITIZER_HAIKU
-# include "interception_linux.h"
-# define INTERCEPT_FUNCTION(func) INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)
-# define INTERCEPT_FUNCTION_VER(func, symver) \
+# include "interception_linux.h"
+# define INTERCEPT_FUNCTION(func) INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)
+# define INTERCEPT_FUNCTION_VER(func, symver) \
INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver)
#elif SANITIZER_APPLE
# include "interception_mac.h"
diff --git a/compiler-rt/lib/interception/interception_aix.cpp b/compiler-rt/lib/interception/interception_aix.cpp
new file mode 100644
index 0000000000000..953bbad96eb47
--- /dev/null
+++ b/compiler-rt/lib/interception/interception_aix.cpp
@@ -0,0 +1,45 @@
+//===-- interception_aix.cpp ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// AIX-specific interception methods.
+//===----------------------------------------------------------------------===//
+
+#include "interception.h"
+#include "sanitizer_common/sanitizer_common.h"
+
+#if SANITIZER_AIX
+
+# include <dlfcn.h> // for dlsym()
+
+namespace __interception {
+
+static void *GetFuncAddr(const char *name, uptr wrapper_addr) {
+ // AIX dlsym can only defect the functions that are exported, so
+ // on AIX, we can not intercept some basic functions like memcpy.
+ // FIXME: if we are going to ship dynamic asan library, we may need to search
+ // all the loaded modules with RTLD_DEFAULT if RTLD_NEXT failed.
+ void *addr = dlsym(RTLD_NEXT, name);
+
+ // In case `name' is not loaded, dlsym ends up finding the actual wrapper.
+ // We don't want to intercept the wrapper and have it point to itself.
+ if ((uptr)addr == wrapper_addr)
+ addr = nullptr;
+ return addr;
+}
+
+bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
+ uptr wrapper) {
+ void *addr = GetFuncAddr(name, wrapper);
+ *ptr_to_real = (uptr)addr;
+ return addr && (func == wrapper);
+}
+
+} // namespace __interception
+#endif // SANITIZER_AIX
diff --git a/compiler-rt/lib/interception/interception_aix.h b/compiler-rt/lib/interception/interception_aix.h
new file mode 100644
index 0000000000000..b86ae89f50461
--- /dev/null
+++ b/compiler-rt/lib/interception/interception_aix.h
@@ -0,0 +1,36 @@
+//===-- interception_aix.h --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// AIX-specific interception methods.
+//===----------------------------------------------------------------------===//
+
+#if SANITIZER_AIX
+
+# if !defined(INCLUDED_FROM_INTERCEPTION_LIB)
+# error \
+ "interception_aix.h should be included from interception library only"
+# endif
+
+# ifndef INTERCEPTION_AIX_H
+# define INTERCEPTION_AIX_H
+
+namespace __interception {
+bool InterceptFunction(const char *name, uptr *ptr_to_real, uptr func,
+ uptr wrapper);
+} // namespace __interception
+
+# define INTERCEPT_FUNCTION_AIX(func) \
+ ::__interception::InterceptFunction( \
+ #func, (::__interception::uptr *)&REAL(func), \
+ (::__interception::uptr) & (func), \
+ (::__interception::uptr) & WRAP(func))
+
+# endif // INTERCEPTION_AIX_H
+#endif // SANITIZER_AIX
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