[asan] Implement interception on AIX

compiler-rt/lib/asan/asan_allocator.cpp

@@ -770,11 +770,16 @@ struct Allocator {
       u8 chunk_state = atomic_load(&m->chunk_state, memory_order_acquire);
       if (chunk_state != CHUNK_ALLOCATED)
         ReportInvalidFree(old_ptr, chunk_state, stack);
-      CHECK_NE(REAL(memcpy), nullptr);
       uptr memcpy_size = Min(new_size, m->UsedSize());
       // If realloc() races with free(), we may start copying freed memory.
       // However, we will report racy double-free later anyway.
+#if !SANITIZER_AIX
+      CHECK_NE(REAL(memcpy), nullptr);
       REAL(memcpy)(new_ptr, old_ptr, memcpy_size);
+#else
+      // AIX does not intercept memcpy, we have to use internal_memcpy here.
+      internal_memcpy(new_ptr, old_ptr, memcpy_size);
+#endif
       Deallocate(old_ptr, 0, 0, stack, FROM_MALLOC);
     }
     return new_ptr;

compiler-rt/lib/asan/asan_interceptors.cpp

@@ -56,6 +56,7 @@ namespace __asan {
 #  define ASAN_READ_STRING(ctx, s, n) \
     ASAN_READ_STRING_OF_LEN((ctx), (s), internal_strlen(s), (n))
 
+#  if ASAN_INTERCEPT_STRCAT || ASAN_INTERCEPT_STRCPY
 static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
 #if SANITIZER_INTERCEPT_STRNLEN
   if (REAL(strnlen)) {
@@ -64,6 +65,7 @@ static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
 #endif
   return internal_strnlen(s, maxlen);
 }
+#  endif
 
 void SetThreadName(const char *name) {
   AsanThread *t = GetCurrentThread();
@@ -275,7 +277,12 @@ INTERCEPTOR(int, pthread_create, void *thread, void *attr,
 #    endif
     asanThreadArgRetval().Create(detached, {start_routine, arg}, [&]() -> uptr {
       result = REAL(pthread_create)(thread, attr, asan_thread_start, t);
+// AIX pthread_t is unsigned int.
+#    if SANITIZER_AIX
+      return result ? 0 : *(unsigned int *)(thread);
+#    else
       return result ? 0 : *(uptr *)(thread);
+#    endif
     });
   }
   if (result != 0) {
@@ -432,12 +439,14 @@ INTERCEPTOR(int, swapcontext, struct ucontext_t *oucp,
 #define siglongjmp __siglongjmp14
 #endif
 
+#  if ASAN_INTERCEPT_LONGJMP
 INTERCEPTOR(void, longjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(longjmp)(env, val);
 }
+#  endif
 
-#if ASAN_INTERCEPT__LONGJMP
+#  if ASAN_INTERCEPT__LONGJMP
 INTERCEPTOR(void, _longjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(_longjmp)(env, val);
@@ -508,6 +517,7 @@ DEFINE_REAL(char*, index, const char *string, int c)
 
 // For both strcat() and strncat() we need to check the validity of |to|
 // argument irrespective of the |from| length.
+#  if ASAN_INTERCEPT_STRCAT
   INTERCEPTOR(char *, strcat, char *to, const char *from) {
     void *ctx;
     ASAN_INTERCEPTOR_ENTER(ctx, strcat);
@@ -547,7 +557,9 @@ INTERCEPTOR(char*, strncat, char *to, const char *from, usize size) {
   }
   return REAL(strncat)(to, from, size);
 }
+#  endif
 
+#  if ASAN_INTERCEPT_STRCPY
 INTERCEPTOR(char *, strcpy, char *to, const char *from) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strcpy);
@@ -569,6 +581,7 @@ INTERCEPTOR(char *, strcpy, char *to, const char *from) {
   }
   return REAL(strcpy)(to, from);
 }
+#  endif
 
 // Windows doesn't always define the strdup identifier,
 // and when it does it's a macro defined to either _strdup
@@ -596,7 +609,13 @@ INTERCEPTOR(char*, strdup, const char *s) {
   GET_STACK_TRACE_MALLOC;
   void *new_mem = asan_malloc(length + 1, &stack);
   if (new_mem) {
+#  if SANITIZER_AIX
+    // memcpy is a static function defined in libc.a on AIX. It can not be
+    // intercepted, so REAL(memcpy) is null on AIX. Use internal_memcpy instead.
+    internal_memcpy(new_mem, s, length + 1);
+#  else
     REAL(memcpy)(new_mem, s, length + 1);
+#  endif
   }
   return reinterpret_cast<char*>(new_mem);
 }
@@ -614,12 +633,17 @@ INTERCEPTOR(char*, __strdup, const char *s) {
   GET_STACK_TRACE_MALLOC;
   void *new_mem = asan_malloc(length + 1, &stack);
   if (new_mem) {
+#    if SANITIZER_AIX
+    internal_memcpy(new_mem, s, length + 1);
+#    else
     REAL(memcpy)(new_mem, s, length + 1);
+#    endif
   }
   return reinterpret_cast<char*>(new_mem);
 }
 #endif // ASAN_INTERCEPT___STRDUP
 
+#  if ASAN_INTERCEPT_STRCPY
 INTERCEPTOR(char*, strncpy, char *to, const char *from, usize size) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strncpy);
@@ -632,6 +656,7 @@ INTERCEPTOR(char*, strncpy, char *to, const char *from, usize size) {
   }
   return REAL(strncpy)(to, from, size);
 }
+#  endif
 
 template <typename Fn>
 static ALWAYS_INLINE auto StrtolImpl(void *ctx, Fn real, const char *nptr,
@@ -743,7 +768,15 @@ static void AtCxaAtexit(void *unused) {
 }
 #endif
 
-#if ASAN_INTERCEPT___CXA_ATEXIT
+#  if ASAN_INTERCEPT_EXIT
+INTERCEPTOR(void, exit, int status) {
+  AsanInitFromRtl();
+  StopInitOrderChecking();
+  REAL(exit)(status);
+}
+#  endif
+
+#  if ASAN_INTERCEPT___CXA_ATEXIT
 INTERCEPTOR(int, __cxa_atexit, void (*func)(void *), void *arg,
             void *dso_handle) {
   if (SANITIZER_APPLE && UNLIKELY(!AsanInited()))
@@ -804,10 +837,14 @@ void InitializeAsanInterceptors() {
   InitializeSignalInterceptors();
 
   // Intercept str* functions.
+#  if ASAN_INTERCEPT_STRCAT
   ASAN_INTERCEPT_FUNC(strcat);
-  ASAN_INTERCEPT_FUNC(strcpy);
   ASAN_INTERCEPT_FUNC(strncat);
+#  endif
+#  if ASAN_INTERCEPT_STRCPY
+  ASAN_INTERCEPT_FUNC(strcpy);
   ASAN_INTERCEPT_FUNC(strncpy);
+#  endif
   ASAN_INTERCEPT_FUNC(strdup);
 #  if ASAN_INTERCEPT___STRDUP
   ASAN_INTERCEPT_FUNC(__strdup);
@@ -827,7 +864,9 @@ void InitializeAsanInterceptors() {
 #  endif
 
   // Intercept jump-related functions.
+#  if ASAN_INTERCEPT_LONGJMP
   ASAN_INTERCEPT_FUNC(longjmp);
+#  endif
 
 #  if ASAN_INTERCEPT_SWAPCONTEXT
   ASAN_INTERCEPT_FUNC(swapcontext);
@@ -894,7 +933,11 @@ void InitializeAsanInterceptors() {
   ASAN_INTERCEPT_FUNC(atexit);
 #endif
 
-#if ASAN_INTERCEPT_PTHREAD_ATFORK
+#  if ASAN_INTERCEPT_EXIT
+  ASAN_INTERCEPT_FUNC(exit);
+#  endif
+
+#  if ASAN_INTERCEPT_PTHREAD_ATFORK
   ASAN_INTERCEPT_FUNC(pthread_atfork);
 #endif
 

compiler-rt/lib/asan/asan_interceptors.h

@@ -31,12 +31,22 @@ void InitializePlatformInterceptors();
 // really defined to replace libc functions.
 #if !SANITIZER_FUCHSIA
 
+#  if !SANITIZER_AIX
+#    define ASAN_INTERCEPT_LONGJMP 1
+#  else
+#    define ASAN_INTERCEPT_LONGJMP 0
+#  endif
+
 // Use macro to describe if specific function should be
 // intercepted on a given platform.
 #if !SANITIZER_WINDOWS
-# define ASAN_INTERCEPT__LONGJMP 1
-# define ASAN_INTERCEPT_INDEX 1
-# define ASAN_INTERCEPT_PTHREAD_CREATE 1
+#    if !SANITIZER_AIX
+#      define ASAN_INTERCEPT__LONGJMP 1
+#    else
+#      define ASAN_INTERCEPT__LONGJMP 0
+#    endif
+#    define ASAN_INTERCEPT_INDEX 1
+#    define ASAN_INTERCEPT_PTHREAD_CREATE 1
 #else
 # define ASAN_INTERCEPT__LONGJMP 0
 # define ASAN_INTERCEPT_INDEX 0
@@ -56,73 +66,87 @@ void InitializePlatformInterceptors();
 # define ASAN_INTERCEPT_SWAPCONTEXT 0
 #endif
 
-#if !SANITIZER_WINDOWS
-# define ASAN_INTERCEPT_SIGLONGJMP 1
-#else
-# define ASAN_INTERCEPT_SIGLONGJMP 0
-#endif
-
-#if SANITIZER_GLIBC
-# define ASAN_INTERCEPT___LONGJMP_CHK 1
-#else
-# define ASAN_INTERCEPT___LONGJMP_CHK 0
-#endif
+#  if !SANITIZER_WINDOWS && !SANITIZER_AIX
+#    define ASAN_INTERCEPT_SIGLONGJMP 1
+#  else
+#    define ASAN_INTERCEPT_SIGLONGJMP 0
+#  endif
 
-#if ASAN_HAS_EXCEPTIONS && !SANITIZER_SOLARIS && !SANITIZER_NETBSD && \
-    (!SANITIZER_WINDOWS || (defined(__MINGW32__) && defined(__i386__)))
-# define ASAN_INTERCEPT___CXA_THROW 1
-# define ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION 1
-# if defined(_GLIBCXX_SJLJ_EXCEPTIONS) || (SANITIZER_IOS && defined(__arm__))
-#  define ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION 1
-# else
-#  define ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION 1
-# endif
-#else
-# define ASAN_INTERCEPT___CXA_THROW 0
-# define ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION 0
-# define ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION 0
-# define ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION 0
-#endif
+#  if SANITIZER_GLIBC
+#    define ASAN_INTERCEPT___LONGJMP_CHK 1
+#  else
+#    define ASAN_INTERCEPT___LONGJMP_CHK 0
+#  endif
+
+#  if ASAN_HAS_EXCEPTIONS && !SANITIZER_SOLARIS && !SANITIZER_NETBSD && \
+      (!SANITIZER_WINDOWS || (defined(__MINGW32__) && defined(__i386__)))
+#    define ASAN_INTERCEPT___CXA_THROW 1
+#    define ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION 1
+#    if defined(_GLIBCXX_SJLJ_EXCEPTIONS) || (SANITIZER_IOS && defined(__arm__))
+#      define ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION 1
+#    else
+#      define ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION 1
+#    endif
+#  else
+#    define ASAN_INTERCEPT___CXA_THROW 0
+#    define ASAN_INTERCEPT___CXA_RETHROW_PRIMARY_EXCEPTION 0
+#    define ASAN_INTERCEPT__UNWIND_RAISEEXCEPTION 0
+#    define ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION 0
+#  endif
+
+#  if !SANITIZER_WINDOWS && !SANITIZER_AIX
+#    define ASAN_INTERCEPT___CXA_ATEXIT 1
+#  else
+#    define ASAN_INTERCEPT___CXA_ATEXIT 0
+#  endif
 
-#if !SANITIZER_WINDOWS
-# define ASAN_INTERCEPT___CXA_ATEXIT 1
-#else
-# define ASAN_INTERCEPT___CXA_ATEXIT 0
-#endif
+#  if SANITIZER_AIX
+#    define ASAN_INTERCEPT_EXIT 1
+#  else
+#    define ASAN_INTERCEPT_EXIT 0
+#  endif
 
-#if SANITIZER_NETBSD
-# define ASAN_INTERCEPT_ATEXIT 1
-#else
-# define ASAN_INTERCEPT_ATEXIT 0
-#endif
+#  if SANITIZER_NETBSD
+#    define ASAN_INTERCEPT_ATEXIT 1
+#  else
+#    define ASAN_INTERCEPT_ATEXIT 0
+#  endif
 
-#if SANITIZER_GLIBC
-# define ASAN_INTERCEPT___STRDUP 1
-#else
-# define ASAN_INTERCEPT___STRDUP 0
-#endif
+#  if SANITIZER_GLIBC
+#    define ASAN_INTERCEPT___STRDUP 1
+#  else
+#    define ASAN_INTERCEPT___STRDUP 0
+#  endif
 
-#if SANITIZER_GLIBC && ASAN_INTERCEPT_PTHREAD_CREATE
-# define ASAN_INTERCEPT_TIMEDJOIN 1
-# define ASAN_INTERCEPT_TRYJOIN 1
-#else
-# define ASAN_INTERCEPT_TIMEDJOIN 0
-# define ASAN_INTERCEPT_TRYJOIN 0
-#endif
+#  if SANITIZER_GLIBC && ASAN_INTERCEPT_PTHREAD_CREATE
+#    define ASAN_INTERCEPT_TIMEDJOIN 1
+#    define ASAN_INTERCEPT_TRYJOIN 1
+#  else
+#    define ASAN_INTERCEPT_TIMEDJOIN 0
+#    define ASAN_INTERCEPT_TRYJOIN 0
+#  endif
 
-#if SANITIZER_LINUX &&                                                \
-    (defined(__arm__) || defined(__aarch64__) || defined(__i386__) || \
-     defined(__x86_64__) || SANITIZER_RISCV64 || SANITIZER_LOONGARCH64)
-# define ASAN_INTERCEPT_VFORK 1
-#else
-# define ASAN_INTERCEPT_VFORK 0
-#endif
+#  if SANITIZER_AIX
+#    define ASAN_INTERCEPT_STRCAT 0
+#    define ASAN_INTERCEPT_STRCPY 0
+#  else
+#    define ASAN_INTERCEPT_STRCAT 1
+#    define ASAN_INTERCEPT_STRCPY 1
+#  endif
+
+#  if SANITIZER_LINUX &&                                                \
+      (defined(__arm__) || defined(__aarch64__) || defined(__i386__) || \
+       defined(__x86_64__) || SANITIZER_RISCV64 || SANITIZER_LOONGARCH64)
+#    define ASAN_INTERCEPT_VFORK 1
+#  else
+#    define ASAN_INTERCEPT_VFORK 0
+#  endif
 
-#if SANITIZER_NETBSD
-# define ASAN_INTERCEPT_PTHREAD_ATFORK 1
-#else
-# define ASAN_INTERCEPT_PTHREAD_ATFORK 0
-#endif
+#  if SANITIZER_NETBSD
+#    define ASAN_INTERCEPT_PTHREAD_ATFORK 1
+#  else
+#    define ASAN_INTERCEPT_PTHREAD_ATFORK 0
+#  endif
 
 DECLARE_REAL(int, memcmp, const void *a1, const void *a2, SIZE_T size)
 DECLARE_REAL(char*, strchr, const char *str, int c)

compiler-rt/lib/asan/asan_interceptors_memintrinsics.cpp

@@ -22,6 +22,13 @@
 
 using namespace __asan;
 
+// AIX does not intercept memcpy, so we have to use internal_memcpy.
+#if !SANITIZER_AIX
+#  define ASAN_MEMCPY_RETURN(to, from, size) REAL(memcpy)(to, from, size)
+#else
+#  define ASAN_MEMCPY_RETURN(to, from, size) internal_memcpy(to, from, size)
+#endif
+
 // memcpy is called during __asan_init() from the internals of printf(...).
 // We do not treat memcpy with to==from as a bug.
 // See http://llvm.org/bugs/show_bug.cgi?id=11763.
@@ -36,7 +43,7 @@ using namespace __asan;
     } else if (UNLIKELY(!AsanInited())) {                     \
       return internal_memcpy(to, from, size);                 \
     }                                                         \
-    return REAL(memcpy)(to, from, size);                      \
+    return ASAN_MEMCPY_RETURN(to, from, size);                \
   } while (0)
 
 // memset is called inside Printf.