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llvm-project/clang/test/CodeGen/ubsan-pointer-overflow.m

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// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=pointer-overflow | FileCheck %s
// CHECK-LABEL: define void @unary_arith
void unary_arith(char *p) {
// CHECK: [[BASE:%.*]] = ptrtoint i8* {{.*}} to i64, !nosanitize
// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], 1, !nosanitize
// CHECK-NEXT: [[POSVALID:%.*]] = icmp uge i64 [[COMPGEP]], [[BASE]], !nosanitize
// CHECK-NEXT: br i1 [[POSVALID]]{{.*}}, !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}, i64 [[BASE]], i64 [[COMPGEP]]){{.*}}, !nosanitize
++p;
// CHECK: ptrtoint i8* {{.*}} to i64, !nosanitize
// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 {{.*}}, -1, !nosanitize
// CHECK: [[NEGVALID:%.*]] = icmp ule i64 [[COMPGEP]], {{.*}}, !nosanitize
// CHECK-NOT: select
// CHECK: br i1 [[NEGVALID]]{{.*}}, !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
--p;
// CHECK: icmp uge i64
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
p++;
// CHECK: icmp ule i64
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
p--;
}
// CHECK-LABEL: define void @binary_arith
void binary_arith(char *p, int i) {
// CHECK: [[SMUL:%.*]] = call { i64, i1 } @llvm.smul.with.overflow.i64(i64 1, i64 %{{.*}}), !nosanitize
// CHECK-NEXT: [[SMULOFLOW:%.*]] = extractvalue { i64, i1 } [[SMUL]], 1, !nosanitize
// CHECK-NEXT: [[SMULVAL:%.*]] = extractvalue { i64, i1 } [[SMUL]], 0, !nosanitize
// CHECK-NEXT: [[BASE:%.*]] = ptrtoint i8* {{.*}} to i64, !nosanitize
// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], [[SMULVAL]], !nosanitize
// CHECK-NEXT: [[OFFSETVALID:%.*]] = xor i1 [[SMULOFLOW]], true, !nosanitize
// CHECK-NEXT: [[POSVALID:%.*]] = icmp uge i64 [[COMPGEP]], [[BASE]], !nosanitize
// CHECK-NEXT: [[POSOFFSET:%.*]] = icmp sge i64 [[SMULVAL]], 0, !nosanitize
// CHECK-NEXT: [[NEGVALID:%.*]] = icmp ult i64 [[COMPGEP]], [[BASE]], !nosanitize
// CHECK-NEXT: [[DIFFVALID:%.*]] = select i1 [[POSOFFSET]], i1 [[POSVALID]], i1 [[NEGVALID]], !nosanitize
// CHECK: [[VALID:%.*]] = and i1 [[DIFFVALID]], [[OFFSETVALID]], !nosanitize
// CHECK-NEXT: br i1 [[VALID]]{{.*}}, !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}, i64 [[BASE]], i64 [[COMPGEP]]){{.*}}, !nosanitize
p + i;
// CHECK: [[OFFSET:%.*]] = sub i64 0, {{.*}}
// CHECK-NEXT: getelementptr inbounds {{.*}} [[OFFSET]]
// CHECK: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
p - i;
}
// CHECK-LABEL: define void @binary_arith_unsigned
void binary_arith_unsigned(char *p, unsigned i) {
// CHECK: [[SMUL:%.*]] = call { i64, i1 } @llvm.smul.with.overflow.i64(i64 1, i64 %{{.*}}), !nosanitize
// CHECK-NEXT: [[SMULOFLOW:%.*]] = extractvalue { i64, i1 } [[SMUL]], 1, !nosanitize
// CHECK-NEXT: [[SMULVAL:%.*]] = extractvalue { i64, i1 } [[SMUL]], 0, !nosanitize
// CHECK-NEXT: [[BASE:%.*]] = ptrtoint i8* {{.*}} to i64, !nosanitize
// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], [[SMULVAL]], !nosanitize
// CHECK-NEXT: [[OFFSETVALID:%.*]] = xor i1 [[SMULOFLOW]], true, !nosanitize
// CHECK-NEXT: [[POSVALID:%.*]] = icmp uge i64 [[COMPGEP]], [[BASE]], !nosanitize
// CHECK: [[VALID:%.*]] = and i1 [[POSVALID]], [[OFFSETVALID]], !nosanitize
// CHECK-NEXT: br i1 [[VALID]]{{.*}}, !nosanitize
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}, i64 [[BASE]], i64 [[COMPGEP]]){{.*}}, !nosanitize
p + i;
// CHECK: [[OFFSET:%.*]] = sub i64 0, {{.*}}
// CHECK-NEXT: getelementptr inbounds {{.*}} [[OFFSET]]
// CHECK: icmp ule i64
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
p - i;
}
// 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-NEXT: [[OFFSETVALID:%.*]] = xor i1 [[SMULOFLOW]], true, !nosanitize
// CHECK-NEXT: [[POSVALID:%.*]] = icmp uge i64 [[COMPGEP]], [[BASE]], !nosanitize
// CHECK-NEXT: [[POSOFFSET:%.*]] = icmp sge i64 [[SMULVAL]], 0, !nosanitize
// CHECK-NEXT: [[NEGVALID:%.*]] = icmp ult i64 [[COMPGEP]], [[BASE]], !nosanitize
// CHECK-NEXT: [[DIFFVALID:%.*]] = select i1 [[POSOFFSET]], i1 [[POSVALID]], i1 [[NEGVALID]], !nosanitize
// CHECK: [[VALID:%.*]] = and i1 [[DIFFVALID]], [[OFFSETVALID]], !nosanitize
// CHECK-NEXT: br i1 [[VALID]]{{.*}}, !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 @variable_len_array_arith
void variable_len_array_arith(int n, int k) {
int vla[n];
int (*p)[n] = &vla;
// CHECK: getelementptr inbounds i32, i32* {{.*}}, i64 [[INC:%.*]]
// CHECK: @llvm.smul.with.overflow.i64(i64 4, i64 [[INC]]), !nosanitize
// CHECK-NOT: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
++p;
// CHECK: getelementptr inbounds i32, i32* {{.*}}, i64 [[IDXPROM:%.*]]
// CHECK: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM]]), !nosanitize
// CHECK: select
// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
p + k;
}
// CHECK-LABEL: define void @objc_id
void objc_id(id *p) {
// CHECK: add i64 {{.*}}, 8, !nosanitize
// CHECK-NOT: select
// CHECK: @__ubsan_handle_pointer_overflow{{.*}}
p++;
}
// CHECK-LABEL: define void @dont_emit_checks_for_no_op_GEPs
// CHECK-NOT: __ubsan_handle_pointer_overflow
void dont_emit_checks_for_no_op_GEPs(char *p) {
&p[0];
int arr[10][10];
&arr[0][0];
}
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