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4847395c54
N3322 makes NULL + 0 well-defined in C, matching the C++ semantics. Adjust the pointer-overflow sanitizer to no longer report NULL + 0 as a pointer overflow in any language mode. NULL + nonzero will of course continue to be reported. As N3322 is part of https://www.open-std.org/jtc1/sc22/wg14/www/previous.html, and we never performed any optimizations based on NULL + 0 being undefined in the first place, I'm applying this change to all C versions.
124 lines
4.2 KiB
C
124 lines
4.2 KiB
C
// RUN: %clang_cc1 -x c -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=pointer-overflow | FileCheck %s
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// RUN: %clang_cc1 -x c++ -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=pointer-overflow | FileCheck %s
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#ifdef __cplusplus
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extern "C" {
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#endif
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// CHECK-LABEL: define{{.*}} void @fixed_len_array
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void fixed_len_array(int k) {
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// CHECK: getelementptr inbounds [10 x [10 x i32]], ptr [[ARR:%.*]], i64 0, i64 [[IDXPROM:%.*]]
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// CHECK-NEXT: [[SMUL:%.*]] = call { i64, i1 } @llvm.smul.with.overflow.i64(i64 40, i64 [[IDXPROM]]), !nosanitize
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// CHECK-NEXT: [[SMULOFLOW:%.*]] = extractvalue { i64, i1 } [[SMUL]], 1, !nosanitize
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// CHECK-NEXT: [[OR:%.+]] = or i1 [[SMULOFLOW]], false, !nosanitize
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// CHECK-NEXT: [[SMULVAL:%.*]] = extractvalue { i64, i1 } [[SMUL]], 0, !nosanitize
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// CHECK-NEXT: [[BASE:%.*]] = ptrtoint ptr [[ARR]] to i64, !nosanitize
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// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], [[SMULVAL]], !nosanitize
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}, i64 [[BASE]], i64 [[COMPGEP]]){{.*}}, !nosanitize
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// CHECK: getelementptr inbounds [10 x i32], ptr {{.*}}, i64 0, i64 [[IDXPROM1:%.*]]
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// CHECK-NEXT: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM1]]), !nosanitize
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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int arr[10][10];
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arr[k][k];
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}
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// CHECK-LABEL: define{{.*}} void @variable_len_array
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void variable_len_array(int n, int k) {
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// CHECK: getelementptr inbounds i32, ptr {{.*}}, i64 [[IDXPROM:%.*]]
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// CHECK-NEXT: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM]]), !nosanitize
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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// CHECK: getelementptr inbounds i32, ptr {{.*}}, i64 [[IDXPROM1:%.*]]
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// CHECK-NEXT: @llvm.smul.with.overflow.i64(i64 4, i64 [[IDXPROM1]]), !nosanitize
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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int arr[n][n];
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arr[k][k];
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}
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// CHECK-LABEL: define{{.*}} void @pointer_array
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void pointer_array(int **arr, int k) {
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// CHECK: @llvm.smul.with.overflow.i64(i64 8, i64 {{.*}}), !nosanitize
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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// CHECK: @llvm.smul.with.overflow.i64(i64 4, i64 {{.*}}), !nosanitize
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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arr[k][k];
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}
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// CHECK-LABEL: define{{.*}} void @pointer_array_unsigned_indices
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void pointer_array_unsigned_indices(int **arr, unsigned k) {
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// CHECK: icmp uge
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// CHECK-NOT: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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// CHECK: icmp uge
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// CHECK-NOT: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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arr[k][k];
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}
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// CHECK-LABEL: define{{.*}} void @pointer_array_mixed_indices
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void pointer_array_mixed_indices(int **arr, int i, unsigned j) {
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// CHECK: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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// CHECK-NOT: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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arr[i][j];
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}
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struct S1 {
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int pad1;
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union {
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char leaf;
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struct S1 *link;
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} u;
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struct S1 *arr;
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};
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// TODO: Currently, structure GEPs are not checked, so there are several
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// potentially unsafe GEPs here which we don't instrument.
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//
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// CHECK-LABEL: define{{.*}} void @struct_index
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void struct_index(struct S1 *p) {
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// CHECK: getelementptr inbounds %struct.S1, ptr [[P:%.*]], i64 10
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// CHECK-NEXT: [[BASE:%.*]] = ptrtoint ptr [[P]] to i64, !nosanitize
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// CHECK-NEXT: [[COMPGEP:%.*]] = add i64 [[BASE]], 240, !nosanitize
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// CHECK: select
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// CHECK: @__ubsan_handle_pointer_overflow{{.*}} i64 [[BASE]], i64 [[COMPGEP]]) {{.*}}, !nosanitize
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// CHECK-NOT: @__ubsan_handle_pointer_overflow
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p->arr[10].u.link->u.leaf;
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}
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typedef void (*funcptr_t)(void);
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// CHECK-LABEL: define{{.*}} void @function_pointer_arith
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void function_pointer_arith(funcptr_t *p, int k) {
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// CHECK: add i64 {{.*}}, 8, !nosanitize
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// CHECK-NOT: select
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// CHECK: @__ubsan_handle_pointer_overflow{{.*}}
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++p;
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// CHECK: @llvm.smul.with.overflow.i64(i64 8, i64 {{.*}}), !nosanitize
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// CHECK: select
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// CHECK: call void @__ubsan_handle_pointer_overflow{{.*}}
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p + k;
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}
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// CHECK-LABEL: define{{.*}} void @dont_emit_checks_for_no_op_GEPs
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// CHECK-NOT: __ubsan_handle_pointer_overflow
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void dont_emit_checks_for_no_op_GEPs(char *p) {
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&p[0];
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int arr[10][10];
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&arr[0][0];
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}
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#ifdef __cplusplus
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}
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#endif
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