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 <fcntl.h> 17 # include <limits.h> 18 # include <procfs.h> 19 20 # include "sanitizer_common.h" 21 # include "sanitizer_procmaps.h" 22 23 namespace __sanitizer { 24 25 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) { 26 uptr fd = internal_open("/proc/self/xmap", O_RDONLY); 27 CHECK_NE(fd, -1); 28 uptr Size = internal_filesize(fd); 29 CHECK_GT(Size, 0); 30 31 // Allow for additional entries by following mmap. 32 size_t MmapedSize = Size * 4 / 3; 33 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()"); 34 Size = internal_read(fd, VmMap, MmapedSize); 35 CHECK_NE(Size, -1); 36 internal_close(fd); 37 proc_maps->data = (char *)VmMap; 38 proc_maps->mmaped_size = MmapedSize; 39 proc_maps->len = Size; 40 } 41 42 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) { 43 if (Error()) return false; // simulate empty maps 44 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len; 45 if (data_.current >= last) return false; 46 47 prxmap_t *xmapentry = 48 const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current)); 49 50 segment->start = (uptr)xmapentry->pr_vaddr; 51 segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size); 52 segment->offset = (uptr)xmapentry->pr_offset; 53 54 segment->protection = 0; 55 if ((xmapentry->pr_mflags & MA_READ) != 0) 56 segment->protection |= kProtectionRead; 57 if ((xmapentry->pr_mflags & MA_WRITE) != 0) 58 segment->protection |= kProtectionWrite; 59 if ((xmapentry->pr_mflags & MA_EXEC) != 0) 60 segment->protection |= kProtectionExecute; 61 if ((xmapentry->pr_mflags & MA_SHARED) != 0) 62 segment->protection |= kProtectionShared; 63 64 if (segment->filename != NULL && segment->filename_size > 0) { 65 char proc_path[PATH_MAX + 1]; 66 67 // Avoid unnecessary readlink on unnamed entires. 68 if (xmapentry->pr_mapname[0] == '\0') 69 segment->filename[0] = '\0'; 70 else { 71 internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s", 72 xmapentry->pr_mapname); 73 ssize_t sz = internal_readlink(proc_path, segment->filename, 74 segment->filename_size - 1); 75 76 // If readlink failed, the map is anonymous. 77 if (sz == -1) 78 segment->filename[0] = '\0'; 79 else if ((size_t)sz < segment->filename_size) 80 // readlink doesn't NUL-terminate. 81 segment->filename[sz] = '\0'; 82 } 83 } 84 85 data_.current += sizeof(prxmap_t); 86 87 return true; 88 } 89 90 } // namespace __sanitizer 91 92 #endif // SANITIZER_SOLARIS 93