libsanitizer/sanitizer_common/sanitizer_procmaps_freebsd.cc

   1 //===-- sanitizer_procmaps_freebsd.cc -------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // Information about the process mappings (FreeBSD-specific parts).
   9 //===----------------------------------------------------------------------===//
  10
  11 #include "sanitizer_platform.h"
  12 #if SANITIZER_FREEBSD
  13 #include "sanitizer_common.h"
  14 #include "sanitizer_freebsd.h"
  15 #include "sanitizer_procmaps.h"
  16
  17 #include <unistd.h>
  18 #include <sys/sysctl.h>
  19 #include <sys/user.h>
  20
  21 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
  22 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
  23 # include <osreldate.h>
  24 # if __FreeBSD_version <= 902001  // v9.2
  25 #  define kinfo_vmentry xkinfo_vmentry
  26 # endif
  27 #endif
  28
  29 namespace __sanitizer {
  30
  31 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
  32   const int Mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_VMMAP, getpid() };
  33   size_t Size = 0;
  34   int Err = sysctl(Mib, 4, NULL, &Size, NULL, 0);
  35   CHECK_EQ(Err, 0);
  36   CHECK_GT(Size, 0);
  37
  38   size_t MmapedSize = Size * 4 / 3;
  39   void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
  40   Size = MmapedSize;
  41   Err = sysctl(Mib, 4, VmMap, &Size, NULL, 0);
  42   CHECK_EQ(Err, 0);
  43
  44   proc_maps->data = (char*)VmMap;
  45   proc_maps->mmaped_size = MmapedSize;
  46   proc_maps->len = Size;
  47 }
  48
  49 bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
  50                                char filename[], uptr filename_size,
  51                                uptr *protection) {
  52   char *last = proc_self_maps_.data + proc_self_maps_.len;
  53   if (current_ >= last) return false;
  54   uptr dummy;
  55   if (!start) start = &dummy;
  56   if (!end) end = &dummy;
  57   if (!offset) offset = &dummy;
  58   if (!protection) protection = &dummy;
  59   struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry*)current_;
  60
  61   *start = (uptr)VmEntry->kve_start;
  62   *end = (uptr)VmEntry->kve_end;
  63   *offset = (uptr)VmEntry->kve_offset;
  64
  65   *protection = 0;
  66   if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
  67     *protection |= kProtectionRead;
  68   if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
  69     *protection |= kProtectionWrite;
  70   if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
  71     *protection |= kProtectionExecute;
  72
  73   if (filename != NULL && filename_size > 0) {
  74     internal_snprintf(filename,
  75                       Min(filename_size, (uptr)PATH_MAX),
  76                       "%s", VmEntry->kve_path);
  77   }
  78
  79   current_ += VmEntry->kve_structsize;
  80
  81   return true;
  82 }
  83
  84 }  // namespace __sanitizer
  85
  86 #endif  // SANITIZER_FREEBSD