libsanitizer/sanitizer_common/sanitizer_procmaps_bsd.cpp

   1 //===-- sanitizer_procmaps_bsd.cpp ----------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Information about the process mappings
  10 // (FreeBSD and NetBSD-specific parts).
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_platform.h"
  14 #if SANITIZER_FREEBSD || SANITIZER_NETBSD
  15 #include "sanitizer_common.h"
  16 #if SANITIZER_FREEBSD
  17 #include "sanitizer_freebsd.h"
  18 #endif
  19 #include "sanitizer_procmaps.h"
  20
  21 // clang-format off
  22 #include <sys/types.h>
  23 #include <sys/sysctl.h>
  24 // clang-format on
  25 #include <unistd.h>
  26 #if SANITIZER_FREEBSD
  27 #include <sys/user.h>
  28 #endif
  29
  30 #include <limits.h>
  31
  32 // Fix 'kinfo_vmentry' definition on FreeBSD prior v9.2 in 32-bit mode.
  33 #if SANITIZER_FREEBSD && (SANITIZER_WORDSIZE == 32)
  34 #include <osreldate.h>
  35 #if __FreeBSD_version <= 902001 // v9.2
  36 #define kinfo_vmentry xkinfo_vmentry
  37 #endif
  38 #endif
  39
  40 namespace __sanitizer {
  41
  42 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
  43   const int Mib[] = {
  44 #if SANITIZER_FREEBSD
  45     CTL_KERN,
  46     KERN_PROC,
  47     KERN_PROC_VMMAP,
  48     getpid()
  49 #elif SANITIZER_NETBSD
  50     CTL_VM,
  51     VM_PROC,
  52     VM_PROC_MAP,
  53     getpid(),
  54     sizeof(struct kinfo_vmentry)
  55 #else
  56 #error "not supported"
  57 #endif
  58   };
  59
  60   uptr Size = 0;
  61   int Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), NULL, &Size, NULL, 0);
  62   CHECK_EQ(Err, 0);
  63   CHECK_GT(Size, 0);
  64
  65   size_t MmapedSize = Size * 4 / 3;
  66   void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");
  67   Size = MmapedSize;
  68   Err = internal_sysctl(Mib, ARRAY_SIZE(Mib), VmMap, &Size, NULL, 0);
  69   CHECK_EQ(Err, 0);
  70   proc_maps->data = (char *)VmMap;
  71   proc_maps->mmaped_size = MmapedSize;
  72   proc_maps->len = Size;
  73 }
  74
  75 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
  76   CHECK(!Error()); // can not fail
  77   char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
  78   if (data_.current >= last)
  79     return false;
  80   const struct kinfo_vmentry *VmEntry =
  81       (const struct kinfo_vmentry *)data_.current;
  82
  83   segment->start = (uptr)VmEntry->kve_start;
  84   segment->end = (uptr)VmEntry->kve_end;
  85   segment->offset = (uptr)VmEntry->kve_offset;
  86
  87   segment->protection = 0;
  88   if ((VmEntry->kve_protection & KVME_PROT_READ) != 0)
  89     segment->protection |= kProtectionRead;
  90   if ((VmEntry->kve_protection & KVME_PROT_WRITE) != 0)
  91     segment->protection |= kProtectionWrite;
  92   if ((VmEntry->kve_protection & KVME_PROT_EXEC) != 0)
  93     segment->protection |= kProtectionExecute;
  94
  95   if (segment->filename != NULL && segment->filename_size > 0) {
  96     internal_snprintf(segment->filename,
  97                       Min(segment->filename_size, (uptr)PATH_MAX), "%s",
  98                       VmEntry->kve_path);
  99   }
 100
 101 #if SANITIZER_FREEBSD
 102   data_.current += VmEntry->kve_structsize;
 103 #else
 104   data_.current += sizeof(*VmEntry);
 105 #endif
 106
 107   return true;
 108 }
 109
 110 } // namespace __sanitizer
 111
 112 #endif