Add new interceptor: strmode(3)

[krytarowski]

Summary

strmode - convert inode status information into a symbolic string

Sponsored by <The NetBSD Foundation>

lib/sanitizer_common/sanitizer_common_interceptors.inc

INTERCEPTOR(char *, fgetln, __sanitizer_FILE *stream, SIZE_T *len) {
   }
   return str;
 }
 #define INIT_FGETLN COMMON_INTERCEPT_FUNCTION(fgetln)
 #else
 #define INIT_FGETLN
 #endif
 
+#if SANITIZER_INTERCEPT_STRMODE
+INTERCEPTOR(void, strmode, u32 mode, char *bp) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, strmode, mode, bp);
+  REAL(strmode)(mode, bp);
+  if (bp)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, bp, REAL(strlen)(bp) + 1);
+}
+#define INIT_STRMODE COMMON_INTERCEPT_FUNCTION(strmode)
+#else
+#define INIT_STRMODE
+#endif
+
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
 
   INIT_TEXTDOMAIN;
   INIT_STRLEN;
   INIT_STRNLEN;
   INIT_STRNDUP;
static void InitializeCommonInterceptors() {
   INIT_READLINK;
   INIT_READLINKAT;
   INIT_NAME_TO_HANDLE_AT;
   INIT_OPEN_BY_HANDLE_AT;
   INIT_STRLCPY;
   INIT_DEVNAME;
   INIT_DEVNAME_R;
   INIT_FGETLN;
+  INIT_STRMODE;
 
 #if SANITIZER_NETBSD
   COMMON_INTERCEPT_FUNCTION(__libc_mutex_lock);
   COMMON_INTERCEPT_FUNCTION(__libc_mutex_unlock);
   COMMON_INTERCEPT_FUNCTION(__libc_thr_setcancelstate);
 #endif
 
   INIT___PRINTF_CHK;
 }

lib/sanitizer_common/sanitizer_platform_interceptors.h

 # define SI_MAC_DEPLOYMENT_BELOW_10_10 0
 #endif
 #define SANITIZER_INTERCEPT_READLINKAT \
   (SI_POSIX && !SI_MAC_DEPLOYMENT_BELOW_10_10)
 
 #define SANITIZER_INTERCEPT_DEVNAME SI_NETBSD
 #define SANITIZER_INTERCEPT_DEVNAME_R SI_NETBSD
 #define SANITIZER_INTERCEPT_FGETLN SI_NETBSD
+#define SANITIZER_INTERCEPT_STRMODE SI_NETBSD
 
 #endif  // #ifndef SANITIZER_PLATFORM_INTERCEPTORS_H

test/sanitizer_common/TestCases/NetBSD/strmode.cc

+// RUN: %clangxx -O0 -g %s -o %t && %run %t
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+int main(void) {
+  struct stat st;
+  char modep[15];
+
+  if (stat("/etc/hosts", &st))
+    exit(1);
+
+  strmode(st.st_mode, modep);
+
+  printf("%s\n", modep);
+
+  return 0;
+}