compiler-rt/lib/sanitizer_common/sanitizer_procmaps_solaris.cpp

   1 //===-- sanitizer_procmaps_solaris.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 (Solaris-specific parts).
  10 //===----------------------------------------------------------------------===//
  11
  12 // Before Solaris 11.4, <procfs.h> doesn't work in a largefile environment.
  13 #undef _FILE_OFFSET_BITS
  14 #include "sanitizer_platform.h"
  15 #if SANITIZER_SOLARIS
  16 #include "sanitizer_common.h"
  17 #include "sanitizer_procmaps.h"
  18
  19 #include <procfs.h>
  20 #include <limits.h>
  21
  22 namespace __sanitizer {
  23
  24 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {
  25   if (!ReadFileToBuffer("/proc/self/xmap", &proc_maps->data,
  26                         &proc_maps->mmaped_size, &proc_maps->len)) {
  27     proc_maps->data = nullptr;
  28     proc_maps->mmaped_size = 0;
  29     proc_maps->len = 0;
  30   }
  31 }
  32
  33 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
  34   if (Error()) return false; // simulate empty maps
  35   char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;
  36   if (data_.current >= last) return false;
  37
  38   prxmap_t *xmapentry =
  39       const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current));
  40
  41   segment->start = (uptr)xmapentry->pr_vaddr;
  42   segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size);
  43   segment->offset = (uptr)xmapentry->pr_offset;
  44
  45   segment->protection = 0;
  46   if ((xmapentry->pr_mflags & MA_READ) != 0)
  47     segment->protection |= kProtectionRead;
  48   if ((xmapentry->pr_mflags & MA_WRITE) != 0)
  49     segment->protection |= kProtectionWrite;
  50   if ((xmapentry->pr_mflags & MA_EXEC) != 0)
  51     segment->protection |= kProtectionExecute;
  52
  53   if (segment->filename != NULL && segment->filename_size > 0) {
  54     char proc_path[PATH_MAX + 1];
  55
  56     internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",
  57                       xmapentry->pr_mapname);
  58     ssize_t sz = internal_readlink(proc_path, segment->filename,
  59                                    segment->filename_size - 1);
  60
  61     // If readlink failed, the map is anonymous.
  62     if (sz == -1) {
  63       segment->filename[0] = '\0';
  64     } else if ((size_t)sz < segment->filename_size)
  65       // readlink doesn't NUL-terminate.
  66       segment->filename[sz] = '\0';
  67   }
  68
  69   data_.current += sizeof(prxmap_t);
  70
  71   return true;
  72 }
  73
  74 }  // namespace __sanitizer
  75
  76 #endif  // SANITIZER_SOLARIS