Add NetBSD support in asan_linux.cc

[krytarowski]

Summary

Part of the code inspired by the original work on libsanitizer in GCC 5.4 by Christos Zoulas.

Sponsored by <The NetBSD Foundation>

[vitalybuka]

lib/asan/asan_linux.cc

112

if (!(*p)) {
  *p = (char *)-1;
  return 0;
}

[krytarowski]

lib/asan/asan_linux.cc

112

I will commit it and locally rediff for this change.

lib/asan/asan_linux.cc

 //===-- asan_linux.cc -----------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of AddressSanitizer, an address sanity checker.
 //
 // Linux-specific details.
 //===----------------------------------------------------------------------===//
 
 #include "sanitizer_common/sanitizer_platform.h"
-#if SANITIZER_FREEBSD || SANITIZER_LINUX
+#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD
 
 #include "asan_interceptors.h"
 #include "asan_internal.h"
 #include "asan_thread.h"
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_freebsd.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_procmaps.h"

 
 #if SANITIZER_FREEBSD
 #include <sys/link_elf.h>
 #endif
 
 #if SANITIZER_ANDROID || SANITIZER_FREEBSD
 #include <ucontext.h>
 extern "C" void* _DYNAMIC;
+#elif SANITIZER_NETBSD
+#include <link_elf.h>
+#include <ucontext.h>
+extern Elf_Dyn _DYNAMIC;
 #else
 #include <sys/ucontext.h>
 #include <link.h>
 #endif
 
 // x86-64 FreeBSD 9.2 and older define 'ucontext_t' incorrectly in
 // 32-bit mode.
 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32) && \
static int FindFirstDSOCallback(struct dl_phdr_info *info, size_t size,
   // Continue until the first dynamic library is found
   if (!info->dlpi_name || info->dlpi_name[0] == 0)
     return 0;
 
   // Ignore vDSO
   if (internal_strncmp(info->dlpi_name, "linux-", sizeof("linux-") - 1) == 0)
     return 0;
 
+#if SANITIZER_NETBSD
+  // Ignore first entry (the main program)
+  char **p = (char **)data;
+  if (*p == NULL) {
+    *p = (char *)-1;
+    return 0;
+  }
+#endif
+
   *(const char **)data = info->dlpi_name;
   return 1;
 }
 
 static bool IsDynamicRTName(const char *libname) {
   return internal_strstr(libname, "libclang_rt.asan") ||
     internal_strstr(libname, "libasan.so");
 }

 #endif
 
 void *AsanDlSymNext(const char *sym) {
   return dlsym(RTLD_NEXT, sym);
 }
 
 } // namespace __asan
 
-#endif // SANITIZER_FREEBSD || SANITIZER_LINUX
+#endif  // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD