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// RUN: %clang_cc1 -x c -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=pointer-overflow | FileCheck %s --check-prefixes=CHECK,CHECK-C
// RUN: %clang_cc1 -x c++ -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=pointer-overflow | FileCheck %s --check-prefixes=CHECK,CHECK-CPP
#ifdef __cplusplus
extern "C" {
#endif
// CHECK-LABEL: define{{.*}} void @fixed_len_array
void fixed_len_array(int k) {
// CHECK: getelementptr inbounds [10 x [10 x i32]], [10 x [10 x i32]]* [[ARR:%.*]], i64 0, i64 [[IDXPROM:%.*]]
// CHECK-NEXT: [[SMUL:%.*]] = call { i64, i1 } @llvm.smul.with.overflow.i64(i64 40, i64 [[IDXPROM]]), !nosanitize
// CHECK-NEXT: [[SMULOFLOW:%.*]] = extractvalue { i64, i1 } [[SMUL]], 1, !nosanitize
// CHECK-NEXT: [[SMULVAL:%.*]] = extractvalue { i64, i1 } [[SMUL]], 0, !nosanitize
// CHECK-NEXT: [[BASE:%.*]] = ptrtoint [10 x [10 x i32]]* [[ARR]] to i64, !nosanitize
// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], [[SMULVAL]], !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}, i64 [[BASE]], i64 [[COMPGEP]]){{.*}}, !nosanitize
// CHECK: getelementptr inbounds [10 x i32], [10 x i32]* {{.*}}, i64 0, i64 [[IDXPROM1:%.*]]
// CHECK-NEXT: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM1]]), !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
int arr[10][10];
arr[k][k];
}
// CHECK-LABEL: define{{.*}} void @variable_len_array
void variable_len_array(int n, int k) {
// CHECK: getelementptr inbounds i32, i32* {{.*}}, i64 [[IDXPROM:%.*]]
// CHECK-NEXT: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM]]), !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
// CHECK: getelementptr inbounds i32, i32* {{.*}}, i64 [[IDXPROM1:%.*]]
// CHECK-NEXT: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM1]]), !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
int arr[n][n];
arr[k][k];
}
// CHECK-LABEL: define{{.*}} void @pointer_array
void pointer_array(int **arr, int k) {
// CHECK: @llvm.smul.with.overflow.i64(i64 8, i64 {{.*}}), !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
// CHECK: @llvm.smul.with.overflow.i64(i64 4, i64 {{.*}}), !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
arr[k][k];
}
// CHECK-LABEL: define{{.*}} void @pointer_array_unsigned_indices
void pointer_array_unsigned_indices(int **arr, unsigned k) {
// CHECK: icmp uge
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
// CHECK: icmp uge
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
arr[k][k];
}
// CHECK-LABEL: define{{.*}} void @pointer_array_mixed_indices
void pointer_array_mixed_indices(int **arr, int i, unsigned j) {
// CHECK: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
arr[i][j];
}
struct S1 {
int pad1;
union {
char leaf;
struct S1 *link;
} u;
struct S1 *arr;
};
// TODO: Currently, structure GEPs are not checked, so there are several
// potentially unsafe GEPs here which we don't instrument.
//
// CHECK-LABEL: define{{.*}} void @struct_index
void struct_index(struct S1 *p) {
// CHECK: getelementptr inbounds %struct.S1, %struct.S1* [[P:%.*]], i64 10
// CHECK-NEXT: [[BASE:%.*]] = ptrtoint %struct.S1* [[P]] to i64, !nosanitize
// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], 240, !nosanitize
// CHECK: select
// CHECK: @__ubsan_handle_pointer_overflow{{.*}} i64 [[BASE]], i64 [[COMPGEP]]) {{.*}}, !nosanitize
// CHECK-NOT: @__ubsan_handle_pointer_overflow
p->arr[10].u.link->u.leaf;
}
typedef void (*funcptr_t)(void);
// CHECK-LABEL: define{{.*}} void @function_pointer_arith
void function_pointer_arith(funcptr_t *p, int k) {
// CHECK: add i64 {{.*}}, 8, !nosanitize
// CHECK-NOT: select
// CHECK: @__ubsan_handle_pointer_overflow{{.*}}
++p;
// CHECK: @llvm.smul.with.overflow.i64(i64 8, i64 {{.*}}), !nosanitize
// CHECK: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
p + k;
}
// CHECK-LABEL: define{{.*}} void @dont_emit_checks_for_no_op_GEPs
// CHECK-C: __ubsan_handle_pointer_overflow
// CHECK-CPP-NOT: __ubsan_handle_pointer_overflow
void dont_emit_checks_for_no_op_GEPs(char *p) {
&p[0];
int arr[10][10];
&arr[0][0];
}
#ifdef __cplusplus
}
#endif
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