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 15 // Avoid conflict between `_TIME_BITS` defined vs. `_FILE_OFFSET_BITS` 16 // undefined in some Linux configurations. 17 #undef _TIME_BITS 18 #include "sanitizer_platform.h" 19 #if SANITIZER_SOLARIS 20 # include <fcntl.h> 21 # include <limits.h> 22 # include <procfs.h> 23 24 # include "sanitizer_common.h" 25 # include "sanitizer_procmaps.h" 26 27 namespace __sanitizer { 28 29 void ReadProcMaps(ProcSelfMapsBuff *proc_maps) { 30 uptr fd = internal_open("/proc/self/xmap", O_RDONLY); 31 CHECK_NE(fd, -1); 32 uptr Size = internal_filesize(fd); 33 CHECK_GT(Size, 0); 34 35 // Allow for additional entries by following mmap. 36 size_t MmapedSize = Size * 4 / 3; 37 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()"); 38 Size = internal_read(fd, VmMap, MmapedSize); 39 CHECK_NE(Size, -1); 40 internal_close(fd); 41 proc_maps->data = (char *)VmMap; 42 proc_maps->mmaped_size = MmapedSize; 43 proc_maps->len = Size; 44 } 45 46 bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) { 47 if (Error()) return false; // simulate empty maps 48 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len; 49 if (data_.current >= last) return false; 50 51 prxmap_t *xmapentry = 52 const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current)); 53 54 segment->start = (uptr)xmapentry->pr_vaddr; 55 segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size); 56 segment->offset = (uptr)xmapentry->pr_offset; 57 58 segment->protection = 0; 59 if ((xmapentry->pr_mflags & MA_READ) != 0) 60 segment->protection |= kProtectionRead; 61 if ((xmapentry->pr_mflags & MA_WRITE) != 0) 62 segment->protection |= kProtectionWrite; 63 if ((xmapentry->pr_mflags & MA_EXEC) != 0) 64 segment->protection |= kProtectionExecute; 65 if ((xmapentry->pr_mflags & MA_SHARED) != 0) 66 segment->protection |= kProtectionShared; 67 68 if (segment->filename != NULL && segment->filename_size > 0) { 69 char proc_path[PATH_MAX + 1]; 70 71 // Avoid unnecessary readlink on unnamed entires. 72 if (xmapentry->pr_mapname[0] == '\0') 73 segment->filename[0] = '\0'; 74 else { 75 internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s", 76 xmapentry->pr_mapname); 77 ssize_t sz = internal_readlink(proc_path, segment->filename, 78 segment->filename_size - 1); 79 80 // If readlink failed, the map is anonymous. 81 if (sz == -1) 82 segment->filename[0] = '\0'; 83 else if ((size_t)sz < segment->filename_size) 84 // readlink doesn't NUL-terminate. 85 segment->filename[sz] = '\0'; 86 } 87 } 88 89 data_.current += sizeof(prxmap_t); 90 91 return true; 92 } 93 94 } // namespace __sanitizer 95 96 #endif // SANITIZER_SOLARIS 97