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Re: [PATCH] Implement -fsanitize=object-size


On Thu, Oct 02, 2014 at 02:04:24PM +0200, Jakub Jelinek wrote:
> Looks much better.

Cool.

> There are some nits I'd change, like:
> 1) no need not to handle bitfields
> 2) IMHO it should handle PARM_DECL and RESULT_DECL alongside of VAR_DECL
> 3) decl_p IMHO should use just DECL_P
> 4) it doesn't make sense to build ADDR_EXPR if you are never going to use
>    it

All these look good - I applied the patch.
 
> Attaching some (incomplete) testcase I've used to look at the
> implementation, e.g. f1 is for testing how it plays together with
> -fsanitize=bounds (perhaps, maybe as a follow-up, we could optimize by
> looking for UBSAN_BOUNDS call with expected arguments in a few statements
> before array access (e.g. remember last UBSAN_BOUNDS seen in the same
> basic block) if inner is DECL_P), f2 to show a case which -fsanitize=bounds
> doesn't instrument, but -fsanitize=object-size should, f3/f4 the same with
> PARM_DECL, f5/f6 unsuccessful attempt for RESULT_DECL, f7/f8 bitfield
> tests, f9 something where __bos is folded very early (already before objsz1
> pass), f10 where __bos is folded during objsz1 pass.
> If you want to turn parts of that testcase into real /ubsan/ tests, go
> ahead.  Other than that, if you are fine with following changes, can you
> incorporate them into the patch and retest?

I created a new testcase based on that, thanks.

I couldn't test bootstrap-ubsan, because of error:
/home/polacek/x/trunk/prev-x86_64-unknown-linux-gnu/libsanitizer/ubsan/.libs/libubsan.a(ubsan_init.o):
.preinit_array section is not allowed in DSO
but I remember that the previous version of the patch passed fine.

I had to add the following

+      if (LOCATION_LOCUS (loc) == UNKNOWN_LOCATION)
+	loc = input_location;

the reason is that on pr59250.C we ICEd, since we hit this assert in
tree-object-size.c:pass_object_sizes::execute;
    gcc_assert (TREE_CODE (result) == INTEGER_CST);
Because fold_call_stmt returned an INTEGER_CST wrapped in NOP_EXPR.
This NOP_EXPR is created in fold_builtin_n so we can a location on it,
and should be discarded in fold_call_stmt: 
            ret = fold_builtin_n (loc, fndecl, args, nargs, ignore);
          if (ret) 
            {
              /* Propagate location information from original call to
                 expansion of builtin.  Otherwise things like
                 maybe_emit_chk_warning, that operate on the expansion
                 of a builtin, will use the wrong location information.  */
              if (gimple_has_location (stmt))
                {
                  tree realret = ret;
                  if (TREE_CODE (ret) == NOP_EXPR)
                    realret = TREE_OPERAND (ret, 0);

However, STMT was without location.  We set the location properly in
instrument_object_size, but in this case the location was UNKNOWN_LOCATION.
So for UNKNOWN_LOCATION I use input_location.

Bootstrapped/regtested on x86_64-linux, ok for trunk?

2014-10-09  Marek Polacek  <polacek@redhat.com>

	* asan.c (pass_sanopt::execute): Handle IFN_UBSAN_OBJECT_SIZE.
	* doc/invoke.texi: Document -fsanitize=object-size.
	* flag-types.h (enum sanitize_code): Add SANITIZE_OBJECT_SIZE and
	or it into SANITIZE_UNDEFINED.
	* gimple-fold.c (gimple_fold_call): Optimize IFN_UBSAN_OBJECT_SIZE.
	* internal-fn.c (expand_UBSAN_OBJECT_SIZE): New function.
	* internal-fn.def (UBSAN_OBJECT_SIZE): Define.
	* opts.c (common_handle_option): Handle -fsanitize=object-size.
	* ubsan.c: Include "tree-object-size.h".
	(ubsan_type_descriptor): Call tree_to_uhwi instead of tree_to_shwi. 
	(ubsan_expand_bounds_ifn): Use false instead of 0.
	(ubsan_expand_objsize_ifn): New function.
	(instrument_object_size): New function.
	(pass_ubsan::execute): Add object size instrumentation.
	* ubsan.h (ubsan_expand_objsize_ifn): Declare.
testsuite/
	* c-c++-common/ubsan/object-size-1.c: New test.
	* c-c++-common/ubsan/object-size-2.c: New test.
	* c-c++-common/ubsan/object-size-3.c: New test.
	* c-c++-common/ubsan/object-size-4.c: New test.
	* c-c++-common/ubsan/object-size-5.c: New test.
	* c-c++-common/ubsan/object-size-6.c: New test.
	* c-c++-common/ubsan/object-size-7.c: New test.
	* c-c++-common/ubsan/object-size-8.c: New test.
	* c-c++-common/ubsan/object-size-9.c: New test.
	* g++.dg/ubsan/object-size-1.C: New test.
	* gcc.dg/ubsan/object-size-9.c: New test.

diff --git gcc/asan.c gcc/asan.c
index fca4ee6..6ea3efe 100644
--- gcc/asan.c
+++ gcc/asan.c
@@ -2879,6 +2879,9 @@ pass_sanopt::execute (function *fun)
 		case IFN_UBSAN_BOUNDS:
 		  no_next = ubsan_expand_bounds_ifn (&gsi);
 		  break;
+		case IFN_UBSAN_OBJECT_SIZE:
+		  no_next = ubsan_expand_objsize_ifn (&gsi);
+		  break;
 		case IFN_ASAN_CHECK:
 		  {
 		    no_next = asan_expand_check_ifn (&gsi, use_calls);
diff --git gcc/doc/invoke.texi gcc/doc/invoke.texi
index 8f3eb16..ba9f98b 100644
--- gcc/doc/invoke.texi
+++ gcc/doc/invoke.texi
@@ -5577,6 +5577,12 @@ This option enables checking of alignment of pointers when they are
 dereferenced, or when a reference is bound to insufficiently aligned target,
 or when a method or constructor is invoked on insufficiently aligned object.
 
+@item -fsanitize=object-size
+@opindex fsanitize=object-size
+This option enables instrumentation of memory references using the
+@code{__builtin_object_size} function.  Various out of bounds pointer
+accesses are detected.
+
 @item -fsanitize=float-divide-by-zero
 @opindex fsanitize=float-divide-by-zero
 Detect floating-point division by zero.  Unlike other similar options,
diff --git gcc/flag-types.h gcc/flag-types.h
index d0818e5..3d01c49 100644
--- gcc/flag-types.h
+++ gcc/flag-types.h
@@ -236,12 +236,14 @@ enum sanitize_code {
   SANITIZE_ALIGNMENT = 1 << 17,
   SANITIZE_NONNULL_ATTRIBUTE = 1 << 18,
   SANITIZE_RETURNS_NONNULL_ATTRIBUTE = 1 << 19,
+  SANITIZE_OBJECT_SIZE = 1 << 20,
   SANITIZE_UNDEFINED = SANITIZE_SHIFT | SANITIZE_DIVIDE | SANITIZE_UNREACHABLE
 		       | SANITIZE_VLA | SANITIZE_NULL | SANITIZE_RETURN
 		       | SANITIZE_SI_OVERFLOW | SANITIZE_BOOL | SANITIZE_ENUM
 		       | SANITIZE_BOUNDS | SANITIZE_ALIGNMENT
 		       | SANITIZE_NONNULL_ATTRIBUTE
-		       | SANITIZE_RETURNS_NONNULL_ATTRIBUTE,
+		       | SANITIZE_RETURNS_NONNULL_ATTRIBUTE
+		       | SANITIZE_OBJECT_SIZE,
   SANITIZE_NONDEFAULT = SANITIZE_FLOAT_DIVIDE | SANITIZE_FLOAT_CAST
 };
 
diff --git gcc/gimple-fold.c gcc/gimple-fold.c
index 8ac2211..e8d101a 100644
--- gcc/gimple-fold.c
+++ gcc/gimple-fold.c
@@ -2662,6 +2662,19 @@ gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace)
 					gimple_call_arg (stmt, 1),
 					gimple_call_arg (stmt, 2));
 	  break;
+        case IFN_UBSAN_OBJECT_SIZE:
+	  if (integer_all_onesp (gimple_call_arg (stmt, 2))
+	      || (TREE_CODE (gimple_call_arg (stmt, 1)) == INTEGER_CST
+		  && TREE_CODE (gimple_call_arg (stmt, 2)) == INTEGER_CST
+		  && tree_int_cst_le (gimple_call_arg (stmt, 1),
+				      gimple_call_arg (stmt, 2))))
+	    {
+	      gsi_replace (gsi, gimple_build_nop (), true);
+	      unlink_stmt_vdef (stmt);
+	      release_defs (stmt);
+	      return true;
+	    }
+	  break;
 	case IFN_UBSAN_CHECK_ADD:
 	  subcode = PLUS_EXPR;
 	  break;
diff --git gcc/internal-fn.c gcc/internal-fn.c
index c2a44b6..c71259d 100644
--- gcc/internal-fn.c
+++ gcc/internal-fn.c
@@ -184,6 +184,14 @@ expand_UBSAN_BOUNDS (gimple stmt ATTRIBUTE_UNUSED)
 /* This should get expanded in the sanopt pass.  */
 
 static void
+expand_UBSAN_OBJECT_SIZE (gimple stmt ATTRIBUTE_UNUSED)
+{
+  gcc_unreachable ();
+}
+
+/* This should get expanded in the sanopt pass.  */
+
+static void
 expand_ASAN_CHECK (gimple stmt ATTRIBUTE_UNUSED)
 {
   gcc_unreachable ();
diff --git gcc/internal-fn.def gcc/internal-fn.def
index 54ade9f..b8e457c 100644
--- gcc/internal-fn.def
+++ gcc/internal-fn.def
@@ -53,6 +53,7 @@ DEF_INTERNAL_FN (UBSAN_BOUNDS, ECF_LEAF | ECF_NOTHROW, NULL)
 DEF_INTERNAL_FN (UBSAN_CHECK_ADD, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
 DEF_INTERNAL_FN (UBSAN_CHECK_SUB, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
 DEF_INTERNAL_FN (UBSAN_CHECK_MUL, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
+DEF_INTERNAL_FN (UBSAN_OBJECT_SIZE, ECF_LEAF | ECF_NOTHROW, NULL)
 DEF_INTERNAL_FN (ABNORMAL_DISPATCHER, ECF_NORETURN, NULL)
 DEF_INTERNAL_FN (BUILTIN_EXPECT, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
 DEF_INTERNAL_FN (ASAN_CHECK, ECF_TM_PURE | ECF_LEAF | ECF_NOTHROW, ".W...")
diff --git gcc/opts.c gcc/opts.c
index 5cb5a39..3d9b6a7 100644
--- gcc/opts.c
+++ gcc/opts.c
@@ -1513,6 +1513,8 @@ common_handle_option (struct gcc_options *opts,
 	      { "returns-nonnull-attribute",
 		SANITIZE_RETURNS_NONNULL_ATTRIBUTE,
 		sizeof "returns-nonnull-attribute" - 1 },
+	      { "object-size", SANITIZE_OBJECT_SIZE,
+		sizeof "object-size" - 1 },
 	      { NULL, 0, 0 }
 	    };
 	    const char *comma;
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-1.c gcc/testsuite/c-c++-common/ubsan/object-size-1.c
index e69de29..7a3c87a 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-1.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-1.c
@@ -0,0 +1,125 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=undefined" } */
+
+/* Sanity-test -fsanitize=object-size.  We use -fsanitize=undefined option
+   to check that this feature doesn't clash with -fsanitize=bounds et al.  */
+
+#define N 20
+
+__attribute__((noinline, noclone)) void
+f1 (int i)
+{
+  volatile int j;
+  char *p, *orig;
+  orig = p = (char *) __builtin_calloc (N, 1);
+  j = *(p + i);
+  j = p[i];
+  p++;
+  j = p[i - 1];
+  j = *(p + i - 1);
+  __builtin_free (orig);
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+__attribute__((noinline, noclone)) void
+f2 (int i)
+{
+  volatile int j;
+  char a[N];
+  __builtin_memset (a, 0, N);
+  j = *(a + i);
+  char *p = a;
+  j = *(p + i);
+  j = p[i];
+  p += 10;
+  j = *(p + i - 10);
+  j = p[i - 10];
+}
+
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+__attribute__((noinline, noclone)) void
+f3 (int i)
+{
+  volatile int j;
+  int *p = (int *) __builtin_calloc (N, sizeof (*p));
+  int *o = &p[i];
+  j = *o;
+  j = o[0];
+  __builtin_free (p);
+}
+
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+__attribute__((noinline, noclone)) void
+f4 (void)
+{
+  /* The second argument to __builtin_calloc is intentional.  */
+  int *p = (int *) __builtin_calloc (3, 1);
+  *p = 42;
+  __builtin_free (p);
+}
+
+/* { dg-output "\[^\n\r]*store to address \[^\n\r]* with insufficient space for an object of type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+__attribute__((noinline, noclone)) void
+f5 (int *p)
+{
+  /* This is not instrumented.  But don't ICE, etc.  */
+  volatile int i = p[N];
+}
+
+int
+main ()
+{
+  f1 (N);
+  f2 (N);
+  f3 (N);
+  f4 ();
+  int *p = (int *) __builtin_calloc (N, sizeof (*p));
+  f5 (p);
+  __builtin_free (p);
+  return 0;
+}
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-2.c gcc/testsuite/c-c++-common/ubsan/object-size-2.c
index e69de29..dba1243 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-2.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-2.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=undefined" } */
+
+void
+foo (unsigned long ul)
+{
+  unsigned int u;
+  u = *(unsigned long *) ul;
+}
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-3.c gcc/testsuite/c-c++-common/ubsan/object-size-3.c
index e69de29..62dc76f 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-3.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-3.c
@@ -0,0 +1,56 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=object-size -fno-sanitize-recover" } */
+
+/* Test valid uses.  */
+
+#define N 20
+
+__attribute__((noinline, noclone)) void
+f1 (int i)
+{
+  volatile int j;
+  char *p, *orig;
+  orig = p = (char *) __builtin_calloc (N, 1);
+  j = *(p + i);
+  j = p[i];
+  p++;
+  j = p[i - 1];
+  j = *(p + i - 1);
+  __builtin_free (orig);
+}
+
+__attribute__((noinline, noclone)) void
+f2 (int i)
+{
+  volatile int j;
+  char a[N];
+  __builtin_memset (a, 0, N);
+  j = *(a + i);
+  char *p = a;
+  j = *(p + i);
+  j = p[i];
+  p += 10;
+  j = *(p + i - 10);
+  j = p[i - 10];
+}
+
+__attribute__((noinline, noclone)) void
+f3 (int i)
+{
+  volatile int j;
+  int *p = (int *) __builtin_calloc (N, sizeof (*p));
+  int *o = &p[i];
+  j = *o;
+  j = o[0];
+  __builtin_free (p);
+}
+
+int
+main ()
+{
+  f1 (N - 1);
+  f2 (N - 1);
+  f3 (N - 1);
+  return 0;
+}
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-4.c gcc/testsuite/c-c++-common/ubsan/object-size-4.c
index e69de29..8b95ec9 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-4.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-4.c
@@ -0,0 +1,31 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=object-size" } */
+
+/* Test that we instrument flexible array members.  */
+
+struct T { int l; int a[]; };
+struct U { int l; int a[0]; };
+
+int
+main (void)
+{
+  volatile int i;
+  struct T *t = (struct T *) __builtin_calloc (sizeof (struct T)
+					       + sizeof (int), 1);
+  i = t->a[1];
+
+  struct U *u = (struct U *) __builtin_calloc (sizeof (struct U)
+					       + sizeof (int), 1);
+  i = u->a[1];
+  return 0;
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-5.c gcc/testsuite/c-c++-common/ubsan/object-size-5.c
index e69de29..3dada10 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-5.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-5.c
@@ -0,0 +1,38 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=object-size" } */
+
+/* Test structures with -fsanitize=object-size.  */
+
+#define N 20
+
+struct S { char *p; int i; };
+struct T { struct S *s; };
+
+__attribute__((noinline, noclone)) void
+f1 (int i)
+{
+  volatile int j;
+  struct S s;
+  s.p = (char *) __builtin_calloc (N, 1);
+  j = s.p[i];
+  j = *(s.p + i);
+  __builtin_free (s.p);
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+int
+main ()
+{
+  f1 (N);
+  f1 (N - 1);
+  return 0;
+}
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-6.c gcc/testsuite/c-c++-common/ubsan/object-size-6.c
index e69de29..0e6035d 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-6.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-6.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=object-size" } */
+
+char
+foo (void *v)
+{
+  return *(char *) v;
+}
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-7.c gcc/testsuite/c-c++-common/ubsan/object-size-7.c
index e69de29..f5b26e5 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-7.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-7.c
@@ -0,0 +1,29 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=object-size" } */
+
+#define N 20
+
+struct S { int a; };
+
+__attribute__((noinline, noclone)) struct S
+f1 (int i)
+{
+  struct S a[N];
+  struct S *p = a;
+  struct S s;
+  s = p[i];
+  return s;
+}
+
+int
+main ()
+{
+  f1 (N);
+  return 0;
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-8.c gcc/testsuite/c-c++-common/ubsan/object-size-8.c
index e69de29..ee0945b 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-8.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-8.c
@@ -0,0 +1,32 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=undefined" } */
+
+struct S { int a; int b; };
+
+static inline __attribute__((always_inline)) int
+foo (struct S *p)
+{
+  volatile int a;
+  a = p->a; /* OK */
+  return p->b;
+}
+
+int
+bar (void)
+{
+  struct S *p = (struct S *) __builtin_calloc (sizeof (int) + sizeof (int) / 2, 1);
+  return foo (p);
+}
+
+int
+main (void)
+{
+  bar ();
+  return 0;
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type 'int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
diff --git gcc/testsuite/c-c++-common/ubsan/object-size-9.c gcc/testsuite/c-c++-common/ubsan/object-size-9.c
index e69de29..829c822 100644
--- gcc/testsuite/c-c++-common/ubsan/object-size-9.c
+++ gcc/testsuite/c-c++-common/ubsan/object-size-9.c
@@ -0,0 +1,97 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=undefined" } */
+
+/* Test PARM_DECLs and RESULT_DECLs.  */
+
+struct T { char d[8]; int e; };
+struct T t = { "abcdefg", 1 };
+#ifdef __cplusplus
+struct C { C () : d("abcdefg"), e(1) {} C (const C &x) { __builtin_memcpy (d, x.d, 8); e = x.e; } ~C () {} char d[8]; int e; };
+#endif
+struct U { int a : 5; int b : 19; int c : 8; };
+struct S { struct U d[10]; };
+struct S s;
+
+int
+f1 (struct T x, int i)
+{
+  char *p = x.d;
+  p += i;
+  return *p;
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+#ifdef __cplusplus
+struct C
+f2 (int i)
+{
+  struct C x;
+  x.d[i] = 'z';
+  return x;
+}
+
+/* { dg-output "\[^\n\r]*index 12 out of bounds for type 'char \\\[8\\\]'\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*store to address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+
+struct C
+f3 (int i)
+{
+  struct C x;
+  char *p = x.d;
+  p += i;
+  *p = 'z';
+  return x;
+}
+
+/* { dg-output "\[^\n\r]*store to address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" { target { c++ } } } */
+
+#endif
+
+int
+f4 (int i)
+{
+  return s.d[i].b;
+}
+
+/* { dg-output "\[^\n\r]*index 12 out of bounds for type 'U \\\[10\\\]'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'unsigned int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+int
+f5 (int i)
+{
+  struct U *u = s.d;
+  u += i;
+  return u->b;
+}
+
+/* { dg-output "\[^\n\r]*load of address \[^\n\r]* with insufficient space for an object of type 'unsigned int'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
+
+int
+main (void)
+{
+  f1 (t, 12);
+#ifdef __cplusplus
+  f2 (12);
+  f3 (12);
+#endif
+  f4 (12);
+  f5 (12);
+  return 0;
+}
diff --git gcc/testsuite/g++.dg/ubsan/object-size-1.C gcc/testsuite/g++.dg/ubsan/object-size-1.C
index e69de29..e2aad46 100644
--- gcc/testsuite/g++.dg/ubsan/object-size-1.C
+++ gcc/testsuite/g++.dg/ubsan/object-size-1.C
@@ -0,0 +1,18 @@
+// { dg-do compile }
+// { dg-options "-fsanitize=undefined -fpermissive" }
+
+struct T { int c; char d[]; };
+
+struct T t = { 1, "a" }; // { dg-warning "initializer-string for array of chars is too long" }
+
+int
+baz (int i)
+{
+  return t.d[i];
+}
+
+int
+main (void)
+{
+  baz (3);
+}
diff --git gcc/testsuite/gcc.dg/ubsan/object-size-9.c gcc/testsuite/gcc.dg/ubsan/object-size-9.c
index e69de29..bb9aa1b 100644
--- gcc/testsuite/gcc.dg/ubsan/object-size-9.c
+++ gcc/testsuite/gcc.dg/ubsan/object-size-9.c
@@ -0,0 +1,24 @@
+/* { dg-do run } */
+/* { dg-skip-if "" { *-*-* } { "*" } { "-O2" } } */
+/* { dg-options "-fsanitize=undefined" } */
+
+struct T { int c; char d[]; };
+struct T t = { 1, "a" };
+
+int
+baz (int i)
+{
+  return t.d[i];
+}
+
+int
+main (void)
+{
+  baz (2);
+  return 0;
+}
+
+/* { dg-output "load of address \[^\n\r]* with insufficient space for an object of type 'char'\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*note: pointer points here\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\[^\n\r]*(\n|\r\n|\r)" } */
+/* { dg-output "\[^\n\r]*\\^\[^\n\r]*(\n|\r\n|\r)" } */
diff --git gcc/ubsan.c gcc/ubsan.c
index c9a72ad..61140d2 100644
--- gcc/ubsan.c
+++ gcc/ubsan.c
@@ -50,6 +50,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "realmpfr.h"
 #include "dfp.h"
 #include "builtins.h"
+#include "tree-object-size.h"
 
 /* Map from a tree to a VAR_DECL tree.  */
 
@@ -391,7 +392,7 @@ ubsan_type_descriptor (tree type, enum ubsan_print_style pstyle)
 	  tree dom = TYPE_DOMAIN (t);
 	  if (dom && TREE_CODE (TYPE_MAX_VALUE (dom)) == INTEGER_CST)
 	    pos += sprintf (&pretty_name[pos], HOST_WIDE_INT_PRINT_DEC,
-			    tree_to_shwi (TYPE_MAX_VALUE (dom)) + 1);
+			    tree_to_uhwi (TYPE_MAX_VALUE (dom)) + 1);
 	  else
 	    /* ??? We can't determine the variable name; print VLA unspec.  */
 	    pretty_name[pos++] = '*';
@@ -614,12 +615,12 @@ ubsan_expand_bounds_ifn (gimple_stmt_iterator *gsi)
   /* Create condition "if (index > bound)".  */
   basic_block then_bb, fallthru_bb;
   gimple_stmt_iterator cond_insert_point
-    = create_cond_insert_point (gsi, 0/*before_p*/, false, true,
+    = create_cond_insert_point (gsi, false, false, true,
 				&then_bb, &fallthru_bb);
   index = fold_convert (TREE_TYPE (bound), index);
   index = force_gimple_operand_gsi (&cond_insert_point, index,
-				    true/*simple_p*/, NULL_TREE,
-				    false/*before*/, GSI_NEW_STMT);
+				    true, NULL_TREE,
+				    false, GSI_NEW_STMT);
   gimple g = gimple_build_cond (GT_EXPR, index, bound, NULL_TREE, NULL_TREE);
   gimple_set_location (g, loc);
   gsi_insert_after (&cond_insert_point, g, GSI_NEW_STMT);
@@ -830,6 +831,76 @@ ubsan_expand_null_ifn (gimple_stmt_iterator *gsip)
   return false;
 }
 
+/* Expand UBSAN_OBJECT_SIZE internal call.  */
+
+bool
+ubsan_expand_objsize_ifn (gimple_stmt_iterator *gsi)
+{
+  gimple stmt = gsi_stmt (*gsi);
+  location_t loc = gimple_location (stmt);
+  gcc_assert (gimple_call_num_args (stmt) == 4);
+
+  tree ptr = gimple_call_arg (stmt, 0);
+  tree offset = gimple_call_arg (stmt, 1);
+  tree size = gimple_call_arg (stmt, 2);
+  tree ckind = gimple_call_arg (stmt, 3);
+  gimple_stmt_iterator gsi_orig = *gsi;
+  gimple g;
+
+  gcc_assert (TREE_CODE (size) == INTEGER_CST);
+  /* See if we can discard the check.  */
+  if (integer_all_onesp (size))
+    /* Yes, __builtin_object_size couldn't determine the
+       object size.  */;
+  else
+    {
+      /* if (offset > objsize) */
+      basic_block then_bb, fallthru_bb;
+      gimple_stmt_iterator cond_insert_point
+	= create_cond_insert_point (gsi, false, false, true,
+				    &then_bb, &fallthru_bb);
+      g = gimple_build_cond (GT_EXPR, offset, size, NULL_TREE, NULL_TREE);
+      gimple_set_location (g, loc);
+      gsi_insert_after (&cond_insert_point, g, GSI_NEW_STMT);
+
+      /* Generate __ubsan_handle_type_mismatch call.  */
+      *gsi = gsi_after_labels (then_bb);
+      if (flag_sanitize_undefined_trap_on_error)
+	g = gimple_build_call (builtin_decl_explicit (BUILT_IN_TRAP), 0);
+      else
+	{
+	  tree data
+	    = ubsan_create_data ("__ubsan_objsz_data", 1, &loc,
+				 ubsan_type_descriptor (TREE_TYPE (ptr),
+							UBSAN_PRINT_POINTER),
+				 NULL_TREE,
+				 build_zero_cst (pointer_sized_int_node),
+				 ckind,
+				 NULL_TREE);
+	  data = build_fold_addr_expr_loc (loc, data);
+	  enum built_in_function bcode
+	    = flag_sanitize_recover
+	      ? BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH
+	      : BUILT_IN_UBSAN_HANDLE_TYPE_MISMATCH_ABORT;
+	  tree p = make_ssa_name (pointer_sized_int_node, NULL);
+	  g = gimple_build_assign_with_ops (NOP_EXPR, p, ptr, NULL_TREE);
+	  gimple_set_location (g, loc);
+	  gsi_insert_before (gsi, g, GSI_SAME_STMT);
+	  g = gimple_build_call (builtin_decl_explicit (bcode), 2, data, p);
+	}
+      gimple_set_location (g, loc);
+      gsi_insert_before (gsi, g, GSI_SAME_STMT);
+
+      /* Point GSI to next logical statement.  */
+      *gsi = gsi_start_bb (fallthru_bb);
+    }
+
+  /* Get rid of the UBSAN_OBJECT_SIZE call from the IR.  */
+  unlink_stmt_vdef (stmt);
+  gsi_remove (&gsi_orig, true);
+  return gsi_end_p (*gsi);
+}
+
 /* Instrument a memory reference.  BASE is the base of MEM, IS_LHS says
    whether the pointer is on the left hand side of the assignment.  */
 
@@ -1339,6 +1410,128 @@ instrument_nonnull_return (gimple_stmt_iterator *gsi)
   flag_delete_null_pointer_checks = save_flag_delete_null_pointer_checks;
 }
 
+/* Instrument memory references.  Here we check whether the pointer
+   points to an out-of-bounds location.  */
+
+static void
+instrument_object_size (gimple_stmt_iterator *gsi, bool is_lhs)
+{
+  gimple stmt = gsi_stmt (*gsi);
+  location_t loc = gimple_location (stmt);
+  tree t = is_lhs ? gimple_get_lhs (stmt) : gimple_assign_rhs1 (stmt);
+  tree type;
+  HOST_WIDE_INT size_in_bytes;
+
+  type = TREE_TYPE (t);
+  if (VOID_TYPE_P (type))
+    return;
+
+  switch (TREE_CODE (t))
+    {
+    case COMPONENT_REF:
+      if (TREE_CODE (t) == COMPONENT_REF
+	  && DECL_BIT_FIELD_REPRESENTATIVE (TREE_OPERAND (t, 1)) != NULL_TREE)
+	{
+	  tree repr = DECL_BIT_FIELD_REPRESENTATIVE (TREE_OPERAND (t, 1));
+	  t = build3 (COMPONENT_REF, TREE_TYPE (repr), TREE_OPERAND (t, 0),
+		      repr, NULL_TREE);
+	}
+      break;
+    case ARRAY_REF:
+    case INDIRECT_REF:
+    case MEM_REF:
+    case VAR_DECL:
+    case PARM_DECL:
+    case RESULT_DECL:
+      break;
+    default:
+      return;
+    }
+
+  size_in_bytes = int_size_in_bytes (type);
+  if (size_in_bytes <= 0)
+    return;
+
+  HOST_WIDE_INT bitsize, bitpos;
+  tree offset;
+  enum machine_mode mode;
+  int volatilep = 0, unsignedp = 0;
+  tree inner = get_inner_reference (t, &bitsize, &bitpos, &offset, &mode,
+				    &unsignedp, &volatilep, false);
+
+  if (bitpos % BITS_PER_UNIT != 0
+      || bitsize != size_in_bytes * BITS_PER_UNIT)
+    return;
+
+  bool decl_p = DECL_P (inner);
+  tree base = decl_p ? inner : TREE_OPERAND (inner, 0);
+  tree ptr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (t)), t);
+
+  while (TREE_CODE (base) == SSA_NAME)
+    {
+      gimple def_stmt = SSA_NAME_DEF_STMT (base);
+      if (gimple_assign_ssa_name_copy_p (def_stmt)
+	  || (gimple_assign_cast_p (def_stmt)
+	      && POINTER_TYPE_P (TREE_TYPE (gimple_assign_rhs1 (def_stmt))))
+	  || (is_gimple_assign (def_stmt)
+	      && gimple_assign_rhs_code (def_stmt) == POINTER_PLUS_EXPR))
+	base = gimple_assign_rhs1 (def_stmt);
+      else
+	break;
+    }
+
+  if (!POINTER_TYPE_P (TREE_TYPE (base)) && !DECL_P (base))
+    return;
+
+  tree sizet;
+  tree base_addr = base;
+  if (decl_p)
+    base_addr = build1 (ADDR_EXPR,
+			build_pointer_type (TREE_TYPE (base)), base);
+  unsigned HOST_WIDE_INT size = compute_builtin_object_size (base_addr, 0);
+  if (size != (unsigned HOST_WIDE_INT) -1)
+    sizet = build_int_cst (sizetype, size);
+  else if (optimize)
+    {
+      if (LOCATION_LOCUS (loc) == UNKNOWN_LOCATION)
+	loc = input_location;
+      /* Generate __builtin_object_size call.  */
+      sizet = builtin_decl_explicit (BUILT_IN_OBJECT_SIZE);
+      sizet = build_call_expr_loc (loc, sizet, 2, base_addr,
+				   integer_zero_node);
+      sizet = force_gimple_operand_gsi (gsi, sizet, false, NULL_TREE, true,
+					GSI_SAME_STMT);
+    }
+  else
+    return;
+
+  /* Generate UBSAN_OBJECT_SIZE (ptr, ptr+sizeof(*ptr)-base, objsize, ckind)
+     call.  */
+  /* ptr + sizeof (*ptr) - base */
+  t = fold_build2 (MINUS_EXPR, sizetype,
+		   fold_convert (pointer_sized_int_node, ptr),
+		   fold_convert (pointer_sized_int_node, base_addr));
+  t = fold_build2 (PLUS_EXPR, sizetype, t, TYPE_SIZE_UNIT (type));
+
+  /* Perhaps we can omit the check.  */
+  if (TREE_CODE (t) == INTEGER_CST
+      && TREE_CODE (sizet) == INTEGER_CST
+      && tree_int_cst_le (t, sizet))
+    return;
+
+  /* Nope.  Emit the check.  */
+  t = force_gimple_operand_gsi (gsi, t, true, NULL_TREE, true,
+				GSI_SAME_STMT);
+  ptr = force_gimple_operand_gsi (gsi, ptr, true, NULL_TREE, true,
+				  GSI_SAME_STMT);
+  tree ckind = build_int_cst (unsigned_char_type_node,
+			      is_lhs ? UBSAN_STORE_OF : UBSAN_LOAD_OF);
+  gimple g = gimple_build_call_internal (IFN_UBSAN_OBJECT_SIZE, 4,
+					 ptr, t, sizet, ckind);
+  gimple_set_location (g, loc);
+  gsi_insert_before (gsi, g, GSI_SAME_STMT);
+}
+
 namespace {
 
 const pass_data pass_data_ubsan =
@@ -1368,7 +1561,8 @@ public:
 			      | SANITIZE_BOOL | SANITIZE_ENUM
 			      | SANITIZE_ALIGNMENT
 			      | SANITIZE_NONNULL_ATTRIBUTE
-			      | SANITIZE_RETURNS_NONNULL_ATTRIBUTE)
+			      | SANITIZE_RETURNS_NONNULL_ATTRIBUTE
+			      | SANITIZE_OBJECT_SIZE)
 	     && current_function_decl != NULL_TREE
 	     && !lookup_attribute ("no_sanitize_undefined",
 				   DECL_ATTRIBUTES (current_function_decl));
@@ -1431,6 +1625,14 @@ pass_ubsan::execute (function *fun)
 	      bb = gimple_bb (stmt);
 	    }
 
+	  if (flag_sanitize & SANITIZE_OBJECT_SIZE)
+	    {
+	      if (gimple_store_p (stmt))
+		instrument_object_size (&gsi, true);
+	      if (gimple_assign_load_p (stmt))
+		instrument_object_size (&gsi, false);
+	    }
+
 	  gsi_next (&gsi);
 	}
     }
diff --git gcc/ubsan.h gcc/ubsan.h
index d0b404f..27c18eb 100644
--- gcc/ubsan.h
+++ gcc/ubsan.h
@@ -40,6 +40,7 @@ enum ubsan_print_style {
 
 extern bool ubsan_expand_bounds_ifn (gimple_stmt_iterator *);
 extern bool ubsan_expand_null_ifn (gimple_stmt_iterator *);
+extern bool ubsan_expand_objsize_ifn (gimple_stmt_iterator *);
 extern tree ubsan_instrument_unreachable (location_t);
 extern tree ubsan_create_data (const char *, int, const location_t *, ...);
 extern tree ubsan_type_descriptor (tree, enum ubsan_print_style = UBSAN_PRINT_NORMAL);

	Marek


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