82 lines · cpp
1//===-- sanitizer_procmaps_linux.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 (Linux-specific parts).10//===----------------------------------------------------------------------===//11 12#include "sanitizer_platform.h"13#if SANITIZER_LINUX14#include "sanitizer_common.h"15#include "sanitizer_procmaps.h"16 17namespace __sanitizer {18 19void ReadProcMaps(ProcSelfMapsBuff *proc_maps) {20 if (!ReadFileToBuffer("/proc/self/maps", &proc_maps->data,21 &proc_maps->mmaped_size, &proc_maps->len)) {22 proc_maps->data = nullptr;23 proc_maps->mmaped_size = 0;24 proc_maps->len = 0;25 }26}27 28static bool IsOneOf(char c, char c1, char c2) {29 return c == c1 || c == c2;30}31 32bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {33 if (Error()) return false; // simulate empty maps34 char *last = data_.proc_self_maps.data + data_.proc_self_maps.len;35 if (data_.current >= last) return false;36 char *next_line =37 (char *)internal_memchr(data_.current, '\n', last - data_.current);38 if (next_line == 0)39 next_line = last;40 // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar41 segment->start = ParseHex(&data_.current);42 CHECK_EQ(*data_.current++, '-');43 segment->end = ParseHex(&data_.current);44 CHECK_EQ(*data_.current++, ' ');45 CHECK(IsOneOf(*data_.current, '-', 'r'));46 segment->protection = 0;47 if (*data_.current++ == 'r') segment->protection |= kProtectionRead;48 CHECK(IsOneOf(*data_.current, '-', 'w'));49 if (*data_.current++ == 'w') segment->protection |= kProtectionWrite;50 CHECK(IsOneOf(*data_.current, '-', 'x'));51 if (*data_.current++ == 'x') segment->protection |= kProtectionExecute;52 CHECK(IsOneOf(*data_.current, 's', 'p'));53 if (*data_.current++ == 's') segment->protection |= kProtectionShared;54 CHECK_EQ(*data_.current++, ' ');55 segment->offset = ParseHex(&data_.current);56 CHECK_EQ(*data_.current++, ' ');57 ParseHex(&data_.current);58 CHECK_EQ(*data_.current++, ':');59 ParseHex(&data_.current);60 CHECK_EQ(*data_.current++, ' ');61 while (IsDecimal(*data_.current)) data_.current++;62 // Qemu may lack the trailing space.63 // https://github.com/google/sanitizers/issues/16064 // CHECK_EQ(*data_.current++, ' ');65 // Skip spaces.66 while (data_.current < next_line && *data_.current == ' ') data_.current++;67 // Fill in the filename.68 if (segment->filename) {69 uptr len =70 Min((uptr)(next_line - data_.current), segment->filename_size - 1);71 internal_strncpy(segment->filename, data_.current, len);72 segment->filename[len] = 0;73 }74 75 data_.current = next_line + 1;76 return true;77}78 79} // namespace __sanitizer80 81#endif // SANITIZER_LINUX82