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-rw-r--r--otautil/SysUtil.cpp349
1 files changed, 177 insertions, 172 deletions
diff --git a/otautil/SysUtil.cpp b/otautil/SysUtil.cpp
index 4cdd60d9f..a8d5f4ad3 100644
--- a/otautil/SysUtil.cpp
+++ b/otautil/SysUtil.cpp
@@ -1,13 +1,25 @@
/*
* Copyright 2006 The Android Open Source Project
*
- * System utilities.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
*/
+
+#include "SysUtil.h"
+
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
-#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -16,197 +28,190 @@
#include <sys/types.h>
#include <unistd.h>
-#include <android-base/logging.h>
+#include <algorithm>
+#include <string>
+#include <vector>
-#include "SysUtil.h"
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
static bool sysMapFD(int fd, MemMapping* pMap) {
- assert(pMap != NULL);
+ CHECK(pMap != nullptr);
- struct stat sb;
- if (fstat(fd, &sb) == -1) {
- PLOG(ERROR) << "fstat(" << fd << ") failed";
- return false;
- }
+ struct stat sb;
+ if (fstat(fd, &sb) == -1) {
+ PLOG(ERROR) << "fstat(" << fd << ") failed";
+ return false;
+ }
- void* memPtr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (memPtr == MAP_FAILED) {
- PLOG(ERROR) << "mmap(" << sb.st_size << ", R, PRIVATE, " << fd << ", 0) failed";
- return false;
- }
+ void* memPtr = mmap(nullptr, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (memPtr == MAP_FAILED) {
+ PLOG(ERROR) << "mmap(" << sb.st_size << ", R, PRIVATE, " << fd << ", 0) failed";
+ return false;
+ }
- pMap->addr = reinterpret_cast<unsigned char*>(memPtr);
- pMap->length = sb.st_size;
- pMap->range_count = 1;
- pMap->ranges = reinterpret_cast<MappedRange*>(malloc(sizeof(MappedRange)));
- if (pMap->ranges == NULL) {
- PLOG(ERROR) << "malloc failed";
- munmap(memPtr, sb.st_size);
- return false;
- }
- pMap->ranges[0].addr = memPtr;
- pMap->ranges[0].length = sb.st_size;
+ pMap->addr = static_cast<unsigned char*>(memPtr);
+ pMap->length = sb.st_size;
+ pMap->ranges.push_back({ memPtr, static_cast<size_t>(sb.st_size) });
- return true;
+ return true;
}
-static int sysMapBlockFile(FILE* mapf, MemMapping* pMap)
-{
- char block_dev[PATH_MAX+1];
- size_t size;
- unsigned int blksize;
- size_t blocks;
- unsigned int range_count;
- unsigned int i;
-
- if (fgets(block_dev, sizeof(block_dev), mapf) == NULL) {
- PLOG(ERROR) << "failed to read block device from header";
- return -1;
- }
- for (i = 0; i < sizeof(block_dev); ++i) {
- if (block_dev[i] == '\n') {
- block_dev[i] = 0;
- break;
- }
- }
-
- if (fscanf(mapf, "%zu %u\n%u\n", &size, &blksize, &range_count) != 3) {
- LOG(ERROR) << "failed to parse block map header";
- return -1;
- }
- if (blksize != 0) {
- blocks = ((size-1) / blksize) + 1;
- }
- if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) {
- LOG(ERROR) << "invalid data in block map file: size " << size << ", blksize " << blksize
- << ", range_count " << range_count;
- return -1;
- }
-
- pMap->range_count = range_count;
- pMap->ranges = reinterpret_cast<MappedRange*>(calloc(range_count, sizeof(MappedRange)));
- if (pMap->ranges == NULL) {
- PLOG(ERROR) << "calloc(" << range_count << ", " << sizeof(MappedRange) << ") failed";
- return -1;
- }
+// A "block map" which looks like this (from uncrypt/uncrypt.cpp):
+//
+// /dev/block/platform/msm_sdcc.1/by-name/userdata # block device
+// 49652 4096 # file size in bytes, block size
+// 3 # count of block ranges
+// 1000 1008 # block range 0
+// 2100 2102 # ... block range 1
+// 30 33 # ... block range 2
+//
+// Each block range represents a half-open interval; the line "30 33"
+// reprents the blocks [30, 31, 32].
+static int sysMapBlockFile(const char* filename, MemMapping* pMap) {
+ CHECK(pMap != nullptr);
+
+ std::string content;
+ if (!android::base::ReadFileToString(filename, &content)) {
+ PLOG(ERROR) << "Failed to read " << filename;
+ return -1;
+ }
+
+ std::vector<std::string> lines = android::base::Split(android::base::Trim(content), "\n");
+ if (lines.size() < 4) {
+ LOG(ERROR) << "Block map file is too short: " << lines.size();
+ return -1;
+ }
+
+ size_t size;
+ unsigned int blksize;
+ if (sscanf(lines[1].c_str(), "%zu %u", &size, &blksize) != 2) {
+ LOG(ERROR) << "Failed to parse file size and block size: " << lines[1];
+ return -1;
+ }
+
+ size_t range_count;
+ if (sscanf(lines[2].c_str(), "%zu", &range_count) != 1) {
+ LOG(ERROR) << "Failed to parse block map header: " << lines[2];
+ return -1;
+ }
+
+ size_t blocks;
+ if (blksize != 0) {
+ blocks = ((size - 1) / blksize) + 1;
+ }
+ if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0 ||
+ lines.size() != 3 + range_count) {
+ LOG(ERROR) << "Invalid data in block map file: size " << size << ", blksize " << blksize
+ << ", range_count " << range_count << ", lines " << lines.size();
+ return -1;
+ }
+
+ // Reserve enough contiguous address space for the whole file.
+ void* reserve = mmap64(nullptr, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (reserve == MAP_FAILED) {
+ PLOG(ERROR) << "failed to reserve address space";
+ return -1;
+ }
+
+ const std::string& block_dev = lines[0];
+ android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(block_dev.c_str(), O_RDONLY)));
+ if (fd == -1) {
+ PLOG(ERROR) << "failed to open block device " << block_dev;
+ munmap(reserve, blocks * blksize);
+ return -1;
+ }
+
+ pMap->ranges.resize(range_count);
+
+ unsigned char* next = static_cast<unsigned char*>(reserve);
+ size_t remaining_size = blocks * blksize;
+ bool success = true;
+ for (size_t i = 0; i < range_count; ++i) {
+ const std::string& line = lines[i + 3];
+
+ size_t start, end;
+ if (sscanf(line.c_str(), "%zu %zu\n", &start, &end) != 2) {
+ LOG(ERROR) << "failed to parse range " << i << " in block map: " << line;
+ success = false;
+ break;
+ }
+ size_t length = (end - start) * blksize;
+ if (end <= start || (end - start) > SIZE_MAX / blksize || length > remaining_size) {
+ LOG(ERROR) << "unexpected range in block map: " << start << " " << end;
+ success = false;
+ break;
+ }
+
+ void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd,
+ static_cast<off64_t>(start) * blksize);
+ if (addr == MAP_FAILED) {
+ PLOG(ERROR) << "failed to map block " << i;
+ success = false;
+ break;
+ }
+ pMap->ranges[i].addr = addr;
+ pMap->ranges[i].length = length;
+
+ next += length;
+ remaining_size -= length;
+ }
+ if (success && remaining_size != 0) {
+ LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size;
+ success = false;
+ }
+ if (!success) {
+ munmap(reserve, blocks * blksize);
+ return -1;
+ }
+
+ pMap->addr = static_cast<unsigned char*>(reserve);
+ pMap->length = size;
+
+ LOG(INFO) << "mmapped " << range_count << " ranges";
+
+ return 0;
+}
- // Reserve enough contiguous address space for the whole file.
- unsigned char* reserve = reinterpret_cast<unsigned char*>(mmap64(NULL, blocks * blksize,
- PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0));
- if (reserve == MAP_FAILED) {
- PLOG(ERROR) << "failed to reserve address space";
- free(pMap->ranges);
- return -1;
- }
+int sysMapFile(const char* fn, MemMapping* pMap) {
+ if (fn == nullptr || pMap == nullptr) {
+ LOG(ERROR) << "Invalid argument(s)";
+ return -1;
+ }
- int fd = open(block_dev, O_RDONLY);
- if (fd < 0) {
- PLOG(ERROR) << "failed to open block device " << block_dev;
- munmap(reserve, blocks * blksize);
- free(pMap->ranges);
- return -1;
- }
+ *pMap = {};
- unsigned char* next = reserve;
- size_t remaining_size = blocks * blksize;
- bool success = true;
- for (i = 0; i < range_count; ++i) {
- size_t start, end;
- if (fscanf(mapf, "%zu %zu\n", &start, &end) != 2) {
- LOG(ERROR) << "failed to parse range " << i << " in block map";
- success = false;
- break;
- }
- size_t length = (end - start) * blksize;
- if (end <= start || ((end - start) > SIZE_MAX / blksize) || length > remaining_size) {
- LOG(ERROR) << "unexpected range in block map: " << start << " " << end;
- success = false;
- break;
- }
-
- void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
- if (addr == MAP_FAILED) {
- PLOG(ERROR) << "failed to map block " << i;
- success = false;
- break;
- }
- pMap->ranges[i].addr = addr;
- pMap->ranges[i].length = length;
-
- next += length;
- remaining_size -= length;
- }
- if (success && remaining_size != 0) {
- LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size;
- success = false;
+ if (fn[0] == '@') {
+ if (sysMapBlockFile(fn + 1, pMap) != 0) {
+ LOG(ERROR) << "Map of '" << fn << "' failed";
+ return -1;
}
- if (!success) {
- close(fd);
- munmap(reserve, blocks * blksize);
- free(pMap->ranges);
+ } else {
+ // This is a regular file.
+ android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(fn, O_RDONLY)));
+ if (fd == -1) {
+ PLOG(ERROR) << "Unable to open '" << fn << "'";
return -1;
}
- close(fd);
- pMap->addr = reserve;
- pMap->length = size;
-
- LOG(INFO) << "mmapped " << range_count << " ranges";
-
- return 0;
-}
-
-int sysMapFile(const char* fn, MemMapping* pMap)
-{
- memset(pMap, 0, sizeof(*pMap));
-
- if (fn && fn[0] == '@') {
- // A map of blocks
- FILE* mapf = fopen(fn+1, "r");
- if (mapf == NULL) {
- PLOG(ERROR) << "Unable to open '" << (fn+1) << "'";
- return -1;
- }
-
- if (sysMapBlockFile(mapf, pMap) != 0) {
- LOG(ERROR) << "Map of '" << fn << "' failed";
- fclose(mapf);
- return -1;
- }
-
- fclose(mapf);
- } else {
- // This is a regular file.
- int fd = open(fn, O_RDONLY);
- if (fd == -1) {
- PLOG(ERROR) << "Unable to open '" << fn << "'";
- return -1;
- }
-
- if (!sysMapFD(fd, pMap)) {
- LOG(ERROR) << "Map of '" << fn << "' failed";
- close(fd);
- return -1;
- }
-
- close(fd);
+ if (!sysMapFD(fd, pMap)) {
+ LOG(ERROR) << "Map of '" << fn << "' failed";
+ return -1;
}
- return 0;
+ }
+ return 0;
}
/*
* Release a memory mapping.
*/
-void sysReleaseMap(MemMapping* pMap)
-{
- int i;
- for (i = 0; i < pMap->range_count; ++i) {
- if (munmap(pMap->ranges[i].addr, pMap->ranges[i].length) < 0) {
- PLOG(ERROR) << "munmap(" << pMap->ranges[i].addr << ", " << pMap->ranges[i].length
- << ") failed";
- }
+void sysReleaseMap(MemMapping* pMap) {
+ std::for_each(pMap->ranges.cbegin(), pMap->ranges.cend(), [](const MappedRange& range) {
+ if (munmap(range.addr, range.length) == -1) {
+ PLOG(ERROR) << "munmap(" << range.addr << ", " << range.length << ") failed";
}
- free(pMap->ranges);
- pMap->ranges = NULL;
- pMap->range_count = 0;
+ });
+ pMap->ranges.clear();
}
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