+2017-01-23 Martin Liska <mliska@suse.cz>
+
+ * asan.c (create_asan_shadow_var): New function.
+ (asan_expand_poison_ifn): Likewise.
+ * asan.h (asan_expand_poison_ifn): New declaration.
+ * internal-fn.c (expand_ASAN_POISON): Likewise.
+ * internal-fn.def (ASAN_POISON): New builtin.
+ * sanopt.c (pass_sanopt::execute): Expand
+ asan_expand_poison_ifn.
+ * tree-inline.c (copy_decl_for_dup_finish): Make function
+ external.
+ * tree-inline.h (copy_decl_for_dup_finish): Likewise.
+ * tree-ssa.c (is_asan_mark_p): New function.
+ (execute_update_addresses_taken): Rewrite local variables
+ (identified just by use-after-scope as addressable) into SSA.
+
2017-01-22 Gerald Pfeifer <gerald@pfeifer.com>
* doc/install.texi (Specific): opensource.apple.com uses https
#include "tree-pass.h"
#include "memmodel.h"
#include "tm_p.h"
+#include "ssa.h"
#include "stringpool.h"
-#include "tree-vrp.h"
#include "tree-ssanames.h"
#include "optabs.h"
#include "emit-rtl.h"
#include "params.h"
#include "builtins.h"
#include "fnmatch.h"
+#include "tree-inline.h"
/* AddressSanitizer finds out-of-bounds and use-after-free bugs
with <2x slowdown on average.
return true;
}
+/* Create ASAN shadow variable for a VAR_DECL which has been rewritten
+ into SSA. Already seen VAR_DECLs are stored in SHADOW_VARS_MAPPING. */
+
+static tree
+create_asan_shadow_var (tree var_decl,
+ hash_map<tree, tree> &shadow_vars_mapping)
+{
+ tree *slot = shadow_vars_mapping.get (var_decl);
+ if (slot == NULL)
+ {
+ tree shadow_var = copy_node (var_decl);
+
+ copy_body_data id;
+ memset (&id, 0, sizeof (copy_body_data));
+ id.src_fn = id.dst_fn = current_function_decl;
+ copy_decl_for_dup_finish (&id, var_decl, shadow_var);
+
+ DECL_ARTIFICIAL (shadow_var) = 1;
+ DECL_IGNORED_P (shadow_var) = 1;
+ DECL_SEEN_IN_BIND_EXPR_P (shadow_var) = 0;
+ gimple_add_tmp_var (shadow_var);
+
+ shadow_vars_mapping.put (var_decl, shadow_var);
+ return shadow_var;
+ }
+ else
+ return *slot;
+}
+
+bool
+asan_expand_poison_ifn (gimple_stmt_iterator *iter,
+ bool *need_commit_edge_insert,
+ hash_map<tree, tree> &shadow_vars_mapping)
+{
+ gimple *g = gsi_stmt (*iter);
+ tree poisoned_var = gimple_call_lhs (g);
+ if (!poisoned_var)
+ {
+ gsi_remove (iter, true);
+ return true;
+ }
+
+ tree shadow_var = create_asan_shadow_var (SSA_NAME_VAR (poisoned_var),
+ shadow_vars_mapping);
+
+ bool recover_p;
+ if (flag_sanitize & SANITIZE_USER_ADDRESS)
+ recover_p = (flag_sanitize_recover & SANITIZE_USER_ADDRESS) != 0;
+ else
+ recover_p = (flag_sanitize_recover & SANITIZE_KERNEL_ADDRESS) != 0;
+ tree size = DECL_SIZE_UNIT (shadow_var);
+ gimple *poison_call
+ = gimple_build_call_internal (IFN_ASAN_MARK, 3,
+ build_int_cst (integer_type_node,
+ ASAN_MARK_POISON),
+ build_fold_addr_expr (shadow_var), size);
+
+ use_operand_p use_p;
+ imm_use_iterator imm_iter;
+ FOR_EACH_IMM_USE_FAST (use_p, imm_iter, poisoned_var)
+ {
+ gimple *use = USE_STMT (use_p);
+ if (is_gimple_debug (use))
+ continue;
+
+ int nargs;
+ tree fun = report_error_func (false, recover_p, tree_to_uhwi (size),
+ &nargs);
+
+ gcall *call = gimple_build_call (fun, 1,
+ build_fold_addr_expr (shadow_var));
+ gimple_set_location (call, gimple_location (use));
+ gimple *call_to_insert = call;
+
+ /* The USE can be a gimple PHI node. If so, insert the call on
+ all edges leading to the PHI node. */
+ if (is_a <gphi *> (use))
+ {
+ gphi *phi = dyn_cast<gphi *> (use);
+ for (unsigned i = 0; i < gimple_phi_num_args (phi); ++i)
+ if (gimple_phi_arg_def (phi, i) == poisoned_var)
+ {
+ edge e = gimple_phi_arg_edge (phi, i);
+
+ if (call_to_insert == NULL)
+ call_to_insert = gimple_copy (call);
+
+ gsi_insert_seq_on_edge (e, call_to_insert);
+ *need_commit_edge_insert = true;
+ call_to_insert = NULL;
+ }
+ }
+ else
+ {
+ gimple_stmt_iterator gsi = gsi_for_stmt (use);
+ gsi_insert_before (&gsi, call, GSI_NEW_STMT);
+ }
+ }
+
+ SSA_NAME_IS_DEFAULT_DEF (poisoned_var) = true;
+ SSA_NAME_DEF_STMT (poisoned_var) = gimple_build_nop ();
+ gsi_replace (iter, poison_call, false);
+
+ return true;
+}
+
/* Instrument the current function. */
static unsigned int
extern tree asan_dynamic_init_call (bool);
extern bool asan_expand_check_ifn (gimple_stmt_iterator *, bool);
extern bool asan_expand_mark_ifn (gimple_stmt_iterator *);
+extern bool asan_expand_poison_ifn (gimple_stmt_iterator *, bool *,
+ hash_map<tree, tree> &);
extern gimple_stmt_iterator create_cond_insert_point
(gimple_stmt_iterator *, bool, bool, bool, basic_block *, basic_block *);
gcc_unreachable ();
}
+/* This should get expanded in the sanopt pass. */
+
+static void
+expand_ASAN_POISON (internal_fn, gcall *)
+{
+ gcc_unreachable ();
+}
/* This should get expanded in the tsan pass. */
DEF_INTERNAL_FN (BUILTIN_EXPECT, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
DEF_INTERNAL_FN (ASAN_CHECK, ECF_TM_PURE | ECF_LEAF | ECF_NOTHROW, ".R...")
DEF_INTERNAL_FN (ASAN_MARK, ECF_LEAF | ECF_NOTHROW, ".R..")
+DEF_INTERNAL_FN (ASAN_POISON, ECF_LEAF | ECF_NOTHROW | ECF_NOVOPS, NULL)
DEF_INTERNAL_FN (ADD_OVERFLOW, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
DEF_INTERNAL_FN (SUB_OVERFLOW, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
DEF_INTERNAL_FN (MUL_OVERFLOW, ECF_CONST | ECF_LEAF | ECF_NOTHROW, NULL)
bool use_calls = ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD < INT_MAX
&& asan_num_accesses >= ASAN_INSTRUMENTATION_WITH_CALL_THRESHOLD;
+ hash_map<tree, tree> shadow_vars_mapping;
+ bool need_commit_edge_insert = false;
FOR_EACH_BB_FN (bb, fun)
{
gimple_stmt_iterator gsi;
case IFN_ASAN_MARK:
no_next = asan_expand_mark_ifn (&gsi);
break;
+ case IFN_ASAN_POISON:
+ no_next = asan_expand_poison_ifn (&gsi,
+ &need_commit_edge_insert,
+ shadow_vars_mapping);
+ break;
default:
break;
}
gsi_next (&gsi);
}
}
+
+ if (need_commit_edge_insert)
+ gsi_commit_edge_inserts ();
+
return 0;
}
+2017-01-23 Martin Liska <mliska@suse.cz>
+
+ * gcc.dg/asan/use-after-scope-3.c: Add additional flags.
+ * gcc.dg/asan/use-after-scope-9.c: Likewise and grep for
+ sanopt optimization for ASAN_POISON.
+
2016-01-23 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* gcc.dg/lto/pr69188_0.c: Require profiling support for testcase.
// { dg-do run }
// { dg-shouldfail "asan" }
+// { dg-additional-options "-O0" }
int
main (void)
// { dg-do run }
// { dg-shouldfail "asan" }
+// { dg-additional-options "-O2 -fdump-tree-asan1" }
int
main (int argc, char **argv)
return *ptr;
}
+// { dg-final { scan-tree-dump-times "= ASAN_POISON \\(\\)" 1 "asan1" } }
// { dg-output "ERROR: AddressSanitizer: stack-use-after-scope on address.*(\n|\r\n|\r)" }
// { dg-output "READ of size .*" }
// { dg-output ".*'a' <== Memory access at offset \[0-9\]* is inside this variable.*" }
but now it will be in the TO_FN. PARM_TO_VAR means enable PARM_DECL to
VAR_DECL translation. */
-static tree
+tree
copy_decl_for_dup_finish (copy_body_data *id, tree decl, tree copy)
{
/* Don't generate debug information for the copy if we wouldn't have
extern bool debug_find_tree (tree, tree);
extern tree copy_fn (tree, tree&, tree&);
extern const char *copy_forbidden (struct function *fun);
+extern tree copy_decl_for_dup_finish (copy_body_data *id, tree decl, tree copy);
/* This is in tree-inline.c since the routine uses
data structures from the inliner. */
#include "cfgexpand.h"
#include "tree-cfg.h"
#include "tree-dfa.h"
+#include "asan.h"
/* Pointer map of variable mappings, keyed by edge. */
static hash_map<edge, auto_vec<edge_var_map> > *edge_var_maps;
}
}
+/* Return true when STMT is ASAN mark where second argument is an address
+ of a local variable. */
+
+static bool
+is_asan_mark_p (gimple *stmt)
+{
+ if (!gimple_call_internal_p (stmt, IFN_ASAN_MARK))
+ return false;
+
+ tree addr = get_base_address (gimple_call_arg (stmt, 1));
+ if (TREE_CODE (addr) == ADDR_EXPR
+ && VAR_P (TREE_OPERAND (addr, 0)))
+ {
+ tree var = TREE_OPERAND (addr, 0);
+ unsigned addressable = TREE_ADDRESSABLE (var);
+ TREE_ADDRESSABLE (var) = 0;
+ bool r = is_gimple_reg (var);
+ TREE_ADDRESSABLE (var) = addressable;
+ return r;
+ }
+
+ return false;
+}
+
/* Compute TREE_ADDRESSABLE and DECL_GIMPLE_REG_P for local variables. */
void
enum gimple_code code = gimple_code (stmt);
tree decl;
- if (code == GIMPLE_CALL
- && optimize_atomic_compare_exchange_p (stmt))
+ if (code == GIMPLE_CALL)
{
- /* For __atomic_compare_exchange_N if the second argument
- is &var, don't mark var addressable;
- if it becomes non-addressable, we'll rewrite it into
- ATOMIC_COMPARE_EXCHANGE call. */
- tree arg = gimple_call_arg (stmt, 1);
- gimple_call_set_arg (stmt, 1, null_pointer_node);
- gimple_ior_addresses_taken (addresses_taken, stmt);
- gimple_call_set_arg (stmt, 1, arg);
+ if (optimize_atomic_compare_exchange_p (stmt))
+ {
+ /* For __atomic_compare_exchange_N if the second argument
+ is &var, don't mark var addressable;
+ if it becomes non-addressable, we'll rewrite it into
+ ATOMIC_COMPARE_EXCHANGE call. */
+ tree arg = gimple_call_arg (stmt, 1);
+ gimple_call_set_arg (stmt, 1, null_pointer_node);
+ gimple_ior_addresses_taken (addresses_taken, stmt);
+ gimple_call_set_arg (stmt, 1, arg);
+ }
+ else if (is_asan_mark_p (stmt))
+ ;
+ else
+ gimple_ior_addresses_taken (addresses_taken, stmt);
}
else
/* Note all addresses taken by the stmt. */
continue;
}
}
+ else if (is_asan_mark_p (stmt))
+ {
+ tree var = TREE_OPERAND (gimple_call_arg (stmt, 1), 0);
+ if (bitmap_bit_p (suitable_for_renaming, DECL_UID (var)))
+ {
+ unlink_stmt_vdef (stmt);
+ if (asan_mark_p (stmt, ASAN_MARK_POISON))
+ {
+ gcall *call
+ = gimple_build_call_internal (IFN_ASAN_POISON, 0);
+ gimple_call_set_lhs (call, var);
+ gsi_replace (&gsi, call, GSI_SAME_STMT);
+ }
+ else
+ gsi_remove (&gsi, true);
+ continue;
+ }
+ }
for (i = 0; i < gimple_call_num_args (stmt); ++i)
{
tree *argp = gimple_call_arg_ptr (stmt, i);
projects / gcc.git / commitdiff