Blacklisted instrumenting _Balloc.

runtime/szrt_asan.c

 //===- subzero/runtime/szrt_asan.c - AddressSanitizer Runtime -----*- C -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 10 matching lines @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/mman.h>
 
 #define RZ_SIZE (32)
 #define SHADOW_SCALE_LOG2 (3)
 #define SHADOW_SCALE ((size_t)1 << SHADOW_SCALE_LOG2)
+#define DEBUG (0)
 
 // Assuming 48 bit address space on 64 bit systems
 #define SHADOW_LENGTH_64 (1u << (48 - SHADOW_SCALE_LOG2))
 #define SHADOW_LENGTH_32 (1u << (32 - SHADOW_SCALE_LOG2))
 #define WORD_SIZE (sizeof(uint32_t))
 #define IS_32_BIT (sizeof(void *) == WORD_SIZE)
 
 #define SHADOW_OFFSET(p) ((uintptr_t)(p) % SHADOW_SCALE)
 #define IS_SHADOW_ALIGNED(p) (SHADOW_OFFSET(p) == 0)
 
 #define MEM2SHADOW(p) (((uintptr_t)(p) >> SHADOW_SCALE_LOG2) + shadow_offset)
 #define SHADOW2MEM(p)                                                          \
   ((uintptr_t)((char *)(p)-shadow_offset) << SHADOW_SCALE_LOG2)
 
 #define POISON_VAL (-1)
 
+#if DEBUG
+#define DUMP(args...)                                                          \
+  do {                                                                         \
+    printf(args);                                                              \
+  } while (false);
+#else // !DEBUG
+#define DUMP(args...)
+#endif // DEBUG
+
 static char *shadow_offset = NULL;
 
 static void __asan_error(char *, int);
 static void __asan_check(char *, int, bool);
 
 void __asan_init(int, void **, int *);
 void __asan_check_load(char *, int);
 void __asan_check_store(char *, int);
 void *__asan_malloc(size_t);
 void __asan_free(char *);
 void __asan_poison(char *, int);
 void __asan_unpoison(char *, int);
 
 static void __asan_error(char *ptr, int size) {
   fprintf(stderr, "Illegal access of %d bytes at %p\n", size, ptr);
   abort();
 }
 
 // check only the first byte of each word unless strict
 static void __asan_check(char *ptr, int size, bool strict) {
   assert(strict || (uintptr_t)ptr % WORD_SIZE == 0);
-  printf("%s check %d bytes at %p\n", (strict) ? "strict" : "loose", size, ptr);
+  DUMP("%s check %d bytes at %p\n", (strict) ? "strict" : "loose", size, ptr);
   char *end = ptr + size;
   int step = (strict) ? 1 : WORD_SIZE;
   for (char *cur = ptr; cur < end; cur += step) {
     char shadow = *(char *)MEM2SHADOW(cur);
-    printf("checking %p against %p with shadow %d\n", cur, MEM2SHADOW(cur),
-           shadow);
+    DUMP("checking %p against %p with shadow %d\n", cur, MEM2SHADOW(cur),
+         shadow);
     if (shadow != 0 && (shadow < 0 || SHADOW_OFFSET(cur) >= shadow)) {
       __asan_error(ptr, size);
     }
   }
 }
 
 void __asan_check_load(char *ptr, int size) {
   // aligned single word accesses may be widened single byte accesses, but for
   // all else use strict check
   bool strict = !((uintptr_t)ptr % WORD_SIZE == 0 && size == WORD_SIZE);
@@ skipping 12 matching lines @@
   assert(shadow_offset == NULL);
   size_t length = (IS_32_BIT) ? SHADOW_LENGTH_32 : SHADOW_LENGTH_64;
   int prot = PROT_READ | PROT_WRITE;
   int flags = MAP_PRIVATE | MAP_ANONYMOUS;
   int fd = -1;
   off_t offset = 0;
   shadow_offset = mmap((void *)length, length, prot, flags, fd, offset);
   if (shadow_offset == NULL)
     fprintf(stderr, "unable to allocate shadow memory\n");
   else
-    printf("set up shadow memory at %p\n", shadow_offset);
+    DUMP("set up shadow memory at %p\n", shadow_offset);
   if (mprotect(MEM2SHADOW(shadow_offset), length >> SHADOW_SCALE_LOG2,
                PROT_NONE))
     fprintf(stderr, "could not protect bad region\n");
   else
-    printf("protected bad region\n");
+    DUMP("protected bad region\n");
 
   // poison global redzones
-  printf("poisioning %d global redzones\n", n_rzs);
+  DUMP("poisioning %d global redzones\n", n_rzs);
   for (int i = 0; i < n_rzs; i++) {
-    printf("(%d) poisoning redzone of size %d at %p\n", i, rz_sizes[i], rzs[i]);
+    DUMP("(%d) poisoning redzone of size %d at %p\n", i, rz_sizes[i], rzs[i]);
     __asan_poison(rzs[i], rz_sizes[i]);
   }
 }
 
 void *__asan_malloc(size_t size) {
-  printf("malloc() called with size %d\n", size);
+  DUMP("malloc() called with size %d\n", size);
   size_t padding =
       (IS_SHADOW_ALIGNED(size)) ? 0 : SHADOW_SCALE - SHADOW_OFFSET(size);
   size_t rz_left_size = RZ_SIZE;
   size_t rz_right_size = RZ_SIZE + padding;
   void *rz_left;
   int err = posix_memalign(&rz_left, SHADOW_SCALE,
                            rz_left_size + size + rz_right_size);
   if (err != 0) {
     assert(err == ENOMEM);
     return NULL;
   }
   void *ret = rz_left + rz_left_size;
   void *rz_right = ret + size;
   __asan_poison(rz_left, rz_left_size);
   __asan_poison(rz_right, rz_right_size);
   // record size and location data so we can find it again
   *(void **)rz_left = rz_right;
   *(size_t *)rz_right = rz_right_size;
   assert((uintptr_t)ret % 8 == 0);
   return ret;
 }
 
 void __asan_free(char *ptr) {
-  printf("free() called on %p\n", ptr);
+  DUMP("free() called on %p\n", ptr);
   void *rz_left = ptr - RZ_SIZE;
   void *rz_right = *(void **)rz_left;
   size_t rz_right_size = *(size_t *)rz_right;
   __asan_unpoison(rz_left, RZ_SIZE);
   __asan_unpoison(rz_right, rz_right_size);
   free(rz_left);
 }
 
 void __asan_poison(char *ptr, int size) {
   char *end = ptr + size;
   assert(IS_SHADOW_ALIGNED(end));
   // redzones should be no greater than RZ_SIZE + RZ_SIZE-1 for alignment
   assert(size < 2 * RZ_SIZE);
-  printf("poison %d bytes at %p: %p - %p\n", size, ptr, MEM2SHADOW(ptr),
-         MEM2SHADOW(end));
+  DUMP("poison %d bytes at %p: %p - %p\n", size, ptr, MEM2SHADOW(ptr),
+       MEM2SHADOW(end));
   size_t offset = SHADOW_OFFSET(ptr);
   *(char *)MEM2SHADOW(ptr) = (offset == 0) ? POISON_VAL : offset;
   ptr += SHADOW_OFFSET(size);
   assert(IS_SHADOW_ALIGNED(ptr));
   for (; ptr != end; ptr += SHADOW_SCALE) {
     *(char *)MEM2SHADOW(ptr) = POISON_VAL;
   }
 }
 
 void __asan_unpoison(char *ptr, int size) {
   char *end = ptr + size;
   assert(IS_SHADOW_ALIGNED(end));
   assert(size < 2 * RZ_SIZE);
-  printf("unpoison %d bytes at %p: %p - %p\n", size, ptr, MEM2SHADOW(ptr),
-         MEM2SHADOW(end));
+  DUMP("unpoison %d bytes at %p: %p - %p\n", size, ptr, MEM2SHADOW(ptr),
+       MEM2SHADOW(end));
   *(char *)MEM2SHADOW(ptr) = 0;
   ptr += SHADOW_OFFSET(size);
   assert(IS_SHADOW_ALIGNED(ptr));
   for (; ptr != end; ptr += SHADOW_SCALE) {
     *(char *)MEM2SHADOW(ptr) = 0;
   }
 }