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-rw-r--r--otautil/SysUtil.cpp126
1 files changed, 58 insertions, 68 deletions
diff --git a/otautil/SysUtil.cpp b/otautil/SysUtil.cpp
index a2133b953..dfa215073 100644
--- a/otautil/SysUtil.cpp
+++ b/otautil/SysUtil.cpp
@@ -16,14 +16,12 @@
#include "SysUtil.h"
-#include <errno.h>
#include <fcntl.h>
-#include <stdint.h>
+#include <stdint.h> // SIZE_MAX
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
-#include <algorithm>
#include <string>
#include <vector>
@@ -32,9 +30,7 @@
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
-static bool sysMapFD(int fd, MemMapping* pMap) {
- CHECK(pMap != nullptr);
-
+bool MemMapping::MapFD(int fd) {
struct stat sb;
if (fstat(fd, &sb) == -1) {
PLOG(ERROR) << "fstat(" << fd << ") failed";
@@ -47,50 +43,49 @@ static bool sysMapFD(int fd, MemMapping* pMap) {
return false;
}
- pMap->addr = static_cast<unsigned char*>(memPtr);
- pMap->length = sb.st_size;
- pMap->ranges.push_back({ memPtr, static_cast<size_t>(sb.st_size) });
+ addr = static_cast<unsigned char*>(memPtr);
+ length = sb.st_size;
+ ranges_.clear();
+ ranges_.emplace_back(MappedRange{ memPtr, static_cast<size_t>(sb.st_size) });
return true;
}
// 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
+// /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);
-
+// Each block range represents a half-open interval; the line "30 33" reprents the blocks
+// [30, 31, 32].
+bool MemMapping::MapBlockFile(const std::string& filename) {
std::string content;
if (!android::base::ReadFileToString(filename, &content)) {
PLOG(ERROR) << "Failed to read " << filename;
- return -1;
+ return false;
}
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;
+ return false;
}
size_t size;
- unsigned int blksize;
- if (sscanf(lines[1].c_str(), "%zu %u", &size, &blksize) != 2) {
+ size_t blksize;
+ if (sscanf(lines[1].c_str(), "%zu %zu", &size, &blksize) != 2) {
LOG(ERROR) << "Failed to parse file size and block size: " << lines[1];
- return -1;
+ return false;
}
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;
+ return false;
}
size_t blocks;
@@ -101,14 +96,14 @@ static int sysMapBlockFile(const char* filename, MemMapping* pMap) {
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;
+ return false;
}
// 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;
+ return false;
}
const std::string& block_dev = lines[0];
@@ -116,10 +111,10 @@ static int sysMapBlockFile(const char* filename, MemMapping* pMap) {
if (fd == -1) {
PLOG(ERROR) << "failed to open block device " << block_dev;
munmap(reserve, blocks * blksize);
- return -1;
+ return false;
}
- pMap->ranges.resize(range_count);
+ ranges_.clear();
unsigned char* next = static_cast<unsigned char*>(reserve);
size_t remaining_size = blocks * blksize;
@@ -129,84 +124,79 @@ static int sysMapBlockFile(const char* filename, MemMapping* pMap) {
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;
+ LOG(ERROR) << "failed to parse range " << i << ": " << 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;
+ size_t range_size = (end - start) * blksize;
+ if (end <= start || (end - start) > SIZE_MAX / blksize || range_size > remaining_size) {
+ LOG(ERROR) << "Invalid range: " << 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;
+ void* range_start = mmap64(next, range_size, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd,
+ static_cast<off64_t>(start) * blksize);
+ if (range_start == MAP_FAILED) {
+ PLOG(ERROR) << "failed to map range " << i << ": " << line;
success = false;
break;
}
- pMap->ranges[i].addr = addr;
- pMap->ranges[i].length = length;
+ ranges_.emplace_back(MappedRange{ range_start, range_size });
- next += length;
- remaining_size -= length;
+ next += range_size;
+ remaining_size -= range_size;
}
if (success && remaining_size != 0) {
- LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size;
+ LOG(ERROR) << "Invalid ranges: remaining_size " << remaining_size;
success = false;
}
if (!success) {
munmap(reserve, blocks * blksize);
- return -1;
+ return false;
}
- pMap->addr = static_cast<unsigned char*>(reserve);
- pMap->length = size;
+ addr = static_cast<unsigned char*>(reserve);
+ length = size;
LOG(INFO) << "mmapped " << range_count << " ranges";
- return 0;
+ return true;
}
-int sysMapFile(const char* fn, MemMapping* pMap) {
- if (fn == nullptr || pMap == nullptr) {
- LOG(ERROR) << "Invalid argument(s)";
- return -1;
+bool MemMapping::MapFile(const std::string& fn) {
+ if (fn.empty()) {
+ LOG(ERROR) << "Empty filename";
+ return false;
}
- *pMap = {};
-
if (fn[0] == '@') {
- if (sysMapBlockFile(fn + 1, pMap) != 0) {
+ // Block map file "@/cache/recovery/block.map".
+ if (!MapBlockFile(fn.substr(1))) {
LOG(ERROR) << "Map of '" << fn << "' failed";
- return -1;
+ return false;
}
} else {
// This is a regular file.
- android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(fn, O_RDONLY)));
+ android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(fn.c_str(), O_RDONLY)));
if (fd == -1) {
PLOG(ERROR) << "Unable to open '" << fn << "'";
- return -1;
+ return false;
}
- if (!sysMapFD(fd, pMap)) {
+ if (!MapFD(fd)) {
LOG(ERROR) << "Map of '" << fn << "' failed";
- return -1;
+ return false;
}
}
- return 0;
+ return true;
}
-/*
- * Release a memory mapping.
- */
-void sysReleaseMap(MemMapping* pMap) {
- std::for_each(pMap->ranges.cbegin(), pMap->ranges.cend(), [](const MappedRange& range) {
+MemMapping::~MemMapping() {
+ for (const auto& range : ranges_) {
if (munmap(range.addr, range.length) == -1) {
- PLOG(ERROR) << "munmap(" << range.addr << ", " << range.length << ") failed";
+ PLOG(ERROR) << "Failed to munmap(" << range.addr << ", " << range.length << ")";
}
- });
- pMap->ranges.clear();
+ };
+ ranges_.clear();
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 17:16:50 +0100