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 and NetBSD-specific parts).
   9 //===----------------------------------------------------------------------===//
  10
  11 #include "sanitizer_platform.h"
  12 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
  13 #include "sanitizer_common.h"
  14 #if SANITIZER_FREEBSD
  15 #include "sanitizer_freebsd.h"
  16 #endif
  17 #include "sanitizer_procmaps.h"
  18
  19 #include <unistd.h>
  20 #include <sys/sysctl.h>
  21 #if SANITIZER_FREEBSD
  22 #include <sys/user.h>
  23 #endif
  24
  25 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
  26 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
  27 # include <osreldate.h>
  28 # if __FreeBSD_version <= 902001  // v9.2
  29 #  define kinfo_vmentry xkinfo_vmentry
  30 # endif
  31 #endif
  32
  33 namespace __sanitizer {
  34
  35 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
  36   const int Mib[] = {
  37 #if SANITIZER_FREEBSD
  38     CTL_KERN,
  39     KERN_PROC,
  40     KERN_PROC_VMMAP,
  41     getpid()
  42 #else
  43     CTL_VM,
  44     VM_PROC,
  45     VM_PROC_MAP,
  46     getpid(),
  47     sizeof(struct kinfo_vmentry)
  48 #endif
  49   };
  50
  51   size_t Size = 0;
  52   int Err = sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
  53   CHECK_EQ(Err, 0);
  54   CHECK_GT(Size, 0);
  55
  56   size_t MmapedSize = Size * 4 / 3;
  57   void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
  58   Size = MmapedSize;
  59   Err = sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
  60   CHECK_EQ(Err, 0);
  61
  62   proc_maps->data = (char*)VmMap;
  63   proc_maps->mmaped_size = MmapedSize;
  64   proc_maps->len = Size;
  65 }
  66
  67 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
  68   char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
  69   if (data_.current >= last) return false;
  70   struct kinfo_vmentry *VmEntry = (struct kinfo_vmentry *)data_.current;
  71
  72   segment->start = (uptr)VmEntry->kve_start;
  73   segment->end = (uptr)VmEntry->kve_end;
  74   segment->offset = (uptr)VmEntry->kve_offset;
  75
  76   segment->protection = 0;
  77   if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
  78     segment->protection |= kProtectionRead;
  79   if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
  80     segment->protection |= kProtectionWrite;
  81   if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
  82     segment->protection |= kProtectionExecute;
  83
  84   if (segment->filename != NULL && segment->filename_size > 0) {
  85     internal_snprintf(segment->filename,
  86                       Min(segment->filename_size, (uptr)PATH_MAX), "%s",
  87                       VmEntry->kve_path);
  88   }
  89
  90 #if SANITIZER_FREEBSD
  91   data_.current += VmEntry->kve_structsize;
  92 #else
  93   data_.current += sizeof(*VmEntry);
  94 #endif
  95
  96   return true;
  97 }
  98
  99 }  // namespace __sanitizer
 100
 101 #endif  // SANITIZER_FREEBSD || SANITIZER_NETBSD