94 lines · 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-exception6//7//===----------------------------------------------------------------------===//8//9// Information about the process mappings (Solaris-specific parts).10//===----------------------------------------------------------------------===//11 12// Avoid conflict between `_TIME_BITS` defined vs. `_FILE_OFFSET_BITS`13// undefined in some Linux configurations.14#undef _TIME_BITS15#include "sanitizer_platform.h"16#if SANITIZER_SOLARIS17# include <fcntl.h>18# include <limits.h>19# include <procfs.h>20 21# include "sanitizer_common.h"22# include "sanitizer_procmaps.h"23 24namespace __sanitizer {25 26void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {27 uptr fd = internal_open("/proc/self/xmap", O_RDONLY);28 CHECK_NE(fd, -1);29 uptr Size = internal_filesize(fd);30 CHECK_GT(Size, 0);31 32 // Allow for additional entries by following mmap.33 size_t MmapedSize = Size * 4 / 3;34 void *VmMap = MmapOrDie(MmapedSize, "ReadProcMaps()");35 Size = internal_read(fd, VmMap, MmapedSize);36 CHECK_NE(Size, -1);37 internal_close(fd);38 proc_maps->data = (char *)VmMap;39 proc_maps->mmaped_size = MmapedSize;40 proc_maps->len = Size;41}42 43bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {44 if (Error()) return false; // simulate empty maps45 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;46 if (data_.current >= last) return false;47 48 prxmap_t *xmapentry =49 const_cast<prxmap_t *>(reinterpret_cast<const prxmap_t *>(data_.current));50 51 segment->start = (uptr)xmapentry->pr_vaddr;52 segment->end = (uptr)(xmapentry->pr_vaddr + xmapentry->pr_size);53 segment->offset = (uptr)xmapentry->pr_offset;54 55 segment->protection = 0;56 if ((xmapentry->pr_mflags & MA_READ) != 0)57 segment->protection |= kProtectionRead;58 if ((xmapentry->pr_mflags & MA_WRITE) != 0)59 segment->protection |= kProtectionWrite;60 if ((xmapentry->pr_mflags & MA_EXEC) != 0)61 segment->protection |= kProtectionExecute;62 if ((xmapentry->pr_mflags & MA_SHARED) != 0)63 segment->protection |= kProtectionShared;64 65 if (segment->filename != NULL && segment->filename_size > 0) {66 char proc_path[PATH_MAX + 1];67 68 // Avoid unnecessary readlink on unnamed entires.69 if (xmapentry->pr_mapname[0] == '\0')70 segment->filename[0] = '\0';71 else {72 internal_snprintf(proc_path, sizeof(proc_path), "/proc/self/path/%s",73 xmapentry->pr_mapname);74 ssize_t sz = internal_readlink(proc_path, segment->filename,75 segment->filename_size - 1);76 77 // If readlink failed, the map is anonymous.78 if (sz == -1)79 segment->filename[0] = '\0';80 else if ((size_t)sz < segment->filename_size)81 // readlink doesn't NUL-terminate.82 segment->filename[sz] = '\0';83 }84 }85 86 data_.current += sizeof(prxmap_t);87 88 return true;89}90 91} // namespace __sanitizer92 93#endif // SANITIZER_SOLARIS94