Add interceptors for the strtoi(3)/strtou(3) from NetBSD

Summary:
strtoi/strtou converts string value to an intmax_t/uintmax_t integer.

Add a dedicated test.

Enable this API for NetBSD.

It's a reworked version of the original work by Yang Zheng.

Reviewers: joerg, vitalybuka

Reviewed By: vitalybuka

Subscribers: kubamracek, tomsun.0.7, mgorny, llvm-commits, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D54702

llvm-svn: 348663

3 files changed, 76 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index c7e8392..2234ea54 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -7809,6 +7809,37 @@ INTERCEPTOR(int, fstatvfs1, int fd, void *buf, int flags) {
 #define INIT_STATVFS1
 #endif
 
+#if SANITIZER_INTERCEPT_STRTOI
+INTERCEPTOR(INTMAX_T, strtoi, const char *nptr, char **endptr, int base,
+            INTMAX_T low, INTMAX_T high, int *rstatus) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, strtoi, nptr, endptr, base, low, high, rstatus);
+  char *real_endptr;
+  INTMAX_T ret = REAL(strtoi)(nptr, &real_endptr, base, low, high, rstatus);
+  StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
+  if (rstatus)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, rstatus, sizeof(*rstatus));
+  return ret;
+}
+
+INTERCEPTOR(UINTMAX_T, strtou, const char *nptr, char **endptr, int base,
+            UINTMAX_T low, UINTMAX_T high, int *rstatus) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, strtou, nptr, endptr, base, low, high, rstatus);
+  char *real_endptr;
+  UINTMAX_T ret = REAL(strtou)(nptr, &real_endptr, base, low, high, rstatus);
+  StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
+  if (rstatus)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, rstatus, sizeof(*rstatus));
+  return ret;
+}
+#define INIT_STRTOI                                                            \
+  COMMON_INTERCEPT_FUNCTION(strtoi);                                           \
+  COMMON_INTERCEPT_FUNCTION(strtou)
+#else
+#define INIT_STRTOI
+#endif
+
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
@@ -8076,6 +8107,7 @@ static void InitializeCommonInterceptors() {
   INIT_STRTONUM;
   INIT_FPARSELN;
   INIT_STATVFS1;
+  INIT_STRTOI;
 
   INIT___PRINTF_CHK;
 }
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
index 6f9b821..18a9879 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -532,5 +532,6 @@
 #define SANITIZER_INTERCEPT_STRTONUM SI_NETBSD
 #define SANITIZER_INTERCEPT_FPARSELN SI_NETBSD
 #define SANITIZER_INTERCEPT_STATVFS1 SI_NETBSD
+#define SANITIZER_INTERCEPT_STRTOI SI_NETBSD
 
 #endif  // #ifndef SANITIZER_PLATFORM_INTERCEPTORS_H
diff --git a/compiler-rt/test/sanitizer_common/TestCases/NetBSD/strtoi.cc b/compiler-rt/test/sanitizer_common/TestCases/NetBSD/strtoi.cc
new file mode 100644
index 0000000..ab1953c
--- /dev/null
+++ b/compiler-rt/test/sanitizer_common/TestCases/NetBSD/strtoi.cc
@@ -0,0 +1,43 @@
+// RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <inttypes.h>
+#include <stdio.h>
+
+void test_strtoi(const char *nptr, int base, intmax_t lo, intmax_t hi) {
+  char *p;
+  int status;
+  intmax_t i = strtoi(nptr, &p, base, lo, hi, &status);
+  printf("strtoi: conversion of '%s' to a number %s, using %jd, p=%#" PRIx8
+         "\n",
+         nptr, status ? "failed" : "successful", i, *p);
+}
+
+void test_strtou(const char *nptr, int base, intmax_t lo, intmax_t hi) {
+  char *p;
+  int status;
+  uintmax_t i = strtou(nptr, &p, base, lo, hi, &status);
+  printf("strtou: conversion of '%s' to a number %s, using %ju, p=%#" PRIx8
+         "\n",
+         nptr, status ? "failed" : "successful", i, *p);
+}
+
+int main(void) {
+  printf("strtoi\n");
+
+  test_strtoi("100", 0, 1, 100);
+  test_strtoi("100", 0, 1, 10);
+  test_strtoi("100xyz", 0, 1, 100);
+  test_strtou("100", 0, 1, 100);
+  test_strtou("100", 0, 1, 10);
+  test_strtou("100xyz", 0, 1, 100);
+
+  // CHECK: strtoi
+  // CHECK: strtoi: conversion of '100' to a number successful, using 100, p=0
+  // CHECK: strtoi: conversion of '100' to a number failed, using 10, p=0
+  // CHECK: strtoi: conversion of '100xyz' to a number failed, using 10, p=0x78
+  // CHECK: strtou: conversion of '100' to a number successful, using 100, p=0
+  // CHECK: strtou: conversion of '100' to a number failed, using 10, p=0
+  // CHECK: strtou: conversion of '100xyz' to a number failed, using 10, p=0x78
+
+  return 0;
+}