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 #include "sanitizer_platform.h" 13 #if SANITIZER_SOLARIS 14 # include <fcntl.h> 15 # include <limits.h> 16 # include <procfs.h> 17 18 # include "sanitizer_common.h" 19 # include "sanitizer_procmaps.h" 20 21 namespace __sanitizer { 22 23 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) { 24 uptr fd = internal_open("/proc/self/xmap", O_RDONLY); 25 CHECK_NE(fd, -1); 26 uptr Size = internal_filesize(fd); 27 CHECK_GT(Size, 0); 28 29 // Allow for additional entries by following mmap. 30 size_t MmapedSize = Size * 4 / 3; 31 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()"); 32 Size = internal_read(fd, VmMap, MmapedSize); 33 CHECK_NE(Size, -1); 34 internal_close(fd); 35 proc_maps->data = (char *)VmMap; 36 proc_maps->mmaped_size = MmapedSize; 37 proc_maps->len = Size; 38 } 39 40 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) { 41 if (Error()) return false; // simulate empty maps 42 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len; 43 if (data_.current >= last) return false; 44 45 prxmap_t *xmapentry = 46 const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current)); 47 48 segment->start = (uptr)xmapentry->pr_vaddr; 49 segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size); 50 segment->offset = (uptr)xmapentry->pr_offset; 51 52 segment->protection = 0; 53 if ((xmapentry->pr_mflags & MA_READ) != 0) 54 segment->protection |= kProtectionRead; 55 if ((xmapentry->pr_mflags & MA_WRITE) != 0) 56 segment->protection |= kProtectionWrite; 57 if ((xmapentry->pr_mflags & MA_EXEC) != 0) 58 segment->protection |= kProtectionExecute; 59 if ((xmapentry->pr_mflags & MA_SHARED) != 0) 60 segment->protection |= kProtectionShared; 61 62 if (segment->filename != NULL && segment->filename_size > 0) { 63 char proc_path[PATH_MAX + 1]; 64 65 // Avoid unnecessary readlink on unnamed entires. 66 if (xmapentry->pr_mapname[0] == '\0') 67 segment->filename[0] = '\0'; 68 else { 69 internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s", 70 xmapentry->pr_mapname); 71 ssize_t sz = internal_readlink(proc_path, segment->filename, 72 segment->filename_size - 1); 73 74 // If readlink failed, the map is anonymous. 75 if (sz == -1) 76 segment->filename[0] = '\0'; 77 else if ((size_t)sz < segment->filename_size) 78 // readlink doesn't NUL-terminate. 79 segment->filename[sz] = '\0'; 80 } 81 } 82 83 data_.current += sizeof(prxmap_t); 84 85 return true; 86 } 87 88 } // namespace __sanitizer 89 90 #endif // SANITIZER_SOLARIS 91