src/libcompiler_builtins/compiler-rt/lib/sanitizer_common/sanitizer_procmaps_freebsd.cc

   1 //===-- sanitizer_procmaps_freebsd.cc -------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Information about the process mappings (FreeBSD-specific parts).
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_platform.h"
  14 #if SANITIZER_FREEBSD
  15 #include "sanitizer_common.h"
  16 #include "sanitizer_freebsd.h"
  17 #include "sanitizer_procmaps.h"
  18
  19 #include <unistd.h>
  20 #include <sys/sysctl.h>
  21 #include <sys/user.h>
  22
  23 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
  24 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
  25 # include <osreldate.h>
  26 # if __FreeBSD_version <= 902001  // v9.2
  27 #  define kinfo_vmentry xkinfo_vmentry
  28 # endif
  29 #endif
  30
  31 namespace __sanitizer {
  32
  33 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
  34   const int Mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, getpid() };
  35   size_t Size = 0;
  36   int Err = sysctl(Mib, 4, NULL, &Size, NULL, 0);
  37   CHECK_EQ(Err, 0);
  38   CHECK_GT(Size, 0);
  39
  40   size_t MmapedSize = Size * 4 / 3;
  41   void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
  42   Size = MmapedSize;
  43   Err = sysctl(Mib, 4, VmMap, &Size, NULL, 0);
  44   CHECK_EQ(Err, 0);
  45
  46   proc_maps->data = (char*)VmMap;
  47   proc_maps->mmaped_size = MmapedSize;
  48   proc_maps->len = Size;
  49 }
  50
  51 bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
  52                                char filename[], uptr filename_size,
  53                                uptr *protection, ModuleArch *arch, u8 *uuid) {
  54   CHECK(!arch && "not implemented");
  55   CHECK(!uuid && "not implemented");
  56   char *last = proc_self_maps_.data + proc_self_maps_.len;
  57   if (current_ >= last) return false;
  58   uptr dummy;
  59   if (!start) start = &dummy;
  60   if (!end) end = &dummy;
  61   if (!offset) offset = &dummy;
  62   if (!protection) protection = &dummy;
  63   struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry*)current_;
  64
  65   *start = (uptr)VmEntry->kve_start;
  66   *end = (uptr)VmEntry->kve_end;
  67   *offset = (uptr)VmEntry->kve_offset;
  68
  69   *protection = 0;
  70   if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
  71     *protection |= kProtectionRead;
  72   if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
  73     *protection |= kProtectionWrite;
  74   if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
  75     *protection |= kProtectionExecute;
  76
  77   if (filename != NULL && filename_size > 0) {
  78     internal_snprintf(filename,
  79                       Min(filename_size, (uptr)PATH_MAX),
  80                       "%s", VmEntry->kve_path);
  81   }
  82
  83   current_ += VmEntry->kve_structsize;
  84
  85   return true;
  86 }
  87
  88 }  // namespace __sanitizer
  89
  90 #endif  // SANITIZER_FREEBSD