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 77