[PATCH] D35551: Introduce sanitizer_procmaps_netbsd.cc

[Kamil Rytarowski via Phabricator via llvm-commits]

krytarowski created this revision.
krytarowski added a project: Sanitizers.
Herald added subscribers: mgorny, kubamracek.

This file defines NetBSD specific:

- ReadProcMaps()
- MemoryMappingLayout::Next()

Add sanitizer_procmaps_netbsd.cc to CMake files.

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

Sponsored by <The NetBSD Foundation>


Repository:
  rL LLVM

https://reviews.llvm.org/D35551

Files:
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/sanitizer_procmaps_netbsd.cc


Index: lib/sanitizer_common/sanitizer_procmaps_netbsd.cc
===================================================================
--- /dev/null
+++ lib/sanitizer_common/sanitizer_procmaps_netbsd.cc
@@ -0,0 +1,78 @@
+//===-- sanitizer_procmaps_netbsd.cc --------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Information about the process mappings (NetBSD-specific parts).
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_platform.h"
+#if SANITIZER_NETBSD
+#include "sanitizer_common.h"
+#include "sanitizer_procmaps.h"
+
+#include <sys/sysctl.h>
+#include <unistd.h>
+
+namespace __sanitizer {
+
+void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
+  struct kinfo_vmentry *kiv;
+  const int Mib[] = {CTL_VM, VM_PROC, VM_PROC_MAP, getpid(), sizeof(*kiv)};
+  size_t Size = 0;
+  int Err = sysctl(Mib, __arraycount(Mib), NULL, &Size, NULL, 0);
+  CHECK_EQ(Err, 0);
+  CHECK_GT(Size, 0);
+
+  size_t MmapedSize = Size * 4 / 3;
+  void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
+  Size = MmapedSize;
+  Err = sysctl(Mib, __arraycount(Mib), VmMap, &Size, NULL, 0);
+  CHECK_EQ(Err, 0);
+
+  proc_maps->data = (char *)VmMap;
+  proc_maps->mmaped_size = MmapedSize;
+  proc_maps->len = Size;
+}
+
+bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
+                               char filename[], uptr filename_size,
+                               uptr *protection, ModuleArch *arch, u8 *uuid) {
+  CHECK(!arch && "not implemented");
+  CHECK(!uuid && "not implemented");
+  char *last = proc_self_maps_.data + proc_self_maps_.len;
+  if (current_ >= last) return false;
+  uptr dummy;
+  if (!start) start = &dummy;
+  if (!end) end = &dummy;
+  if (!offset) offset = &dummy;
+  if (!protection) protection = &dummy;
+  struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry *)current_;
+
+  *start = (uptr)VmEntry->kve_start;
+  *end = (uptr)VmEntry->kve_end;
+  *offset = (uptr)VmEntry->kve_offset;
+
+  *protection = 0;
+  if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
+    *protection |= kProtectionRead;
+  if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
+    *protection |= kProtectionWrite;
+  if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
+    *protection |= kProtectionExecute;
+
+  if (filename != NULL && filename_size > 0) {
+    internal_snprintf(filename, Min(filename_size, (uptr)PATH_MAX), "%s",
+                      VmEntry->kve_path);
+  }
+
+  current_ += sizeof(*VmEntry);
+
+  return true;
+}
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_NETBSD
Index: lib/sanitizer_common/CMakeLists.txt
===================================================================
--- lib/sanitizer_common/CMakeLists.txt
+++ lib/sanitizer_common/CMakeLists.txt
@@ -23,6 +23,7 @@
   sanitizer_procmaps_freebsd.cc
   sanitizer_procmaps_linux.cc
   sanitizer_procmaps_mac.cc
+  sanitizer_procmaps_netbsd.cc
   sanitizer_stackdepot.cc
   sanitizer_stacktrace.cc
   sanitizer_stacktrace_printer.cc


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