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libcutils: fs_config test report aliases 

Instead of requiring aliases, let's report when we see
system/<partition>/ all by itself, or in the company of the alias
<partition>/.  Report if we see duplicate entries.  Add checking for
overrides as well.  Report any simple corruptions in internal table
or in the override files.

Test: gTest libcutils_test --gtest_filter=fs_config.*
Bug: 37703469
Change-Id: Ia6a7e8c9bc9f553d0c1c313937b511b2073318a9
This commit is contained in:
Mark Salyzyn 2017-05-03 08:54:26 -07:00
parent 2d37797b68
commit fa39110a8f
1 changed files with 150 additions and 25 deletions
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175
libcutils/tests/fs_config.cpp
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@ -14,63 +14,188 @@
* limitations under the License.
*/
#include <inttypes.h>
#include <string>
#include <gtest/gtest.h>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <private/android_filesystem_config.h>
#include <private/fs_config.h>
extern const struct fs_path_config* __for_testing_only__android_dirs;
extern const struct fs_path_config* __for_testing_only__android_files;
extern const fs_path_config* __for_testing_only__android_dirs;
extern const fs_path_config* __for_testing_only__android_files;
static void check_one(const struct fs_path_config* paths, const std::string& prefix,
const std::string& alternate) {
for (size_t idx = 0; paths[idx].prefix; ++idx) {
std::string path(paths[idx].prefix);
if (android::base::StartsWith(path, prefix.c_str())) {
path = alternate + path.substr(prefix.length());
size_t second;
for (second = 0; paths[second].prefix; ++second) {
if (path == paths[second].prefix) break;
// Maximum entries in system/core/libcutils/fs_config.cpp:android_* before we
// hit a nullptr termination, before we declare the list is just too big or
// could be missing the nullptr.
static constexpr size_t max_idx = 4096;
static bool check_unique(std::vector<const char*>& paths, const std::string& config_name,
const std::string& prefix) {
bool retval = false;
std::string alternate = "system/" + prefix;
for (size_t idx = 0; idx < paths.size(); ++idx) {
size_t second;
std::string path(paths[idx]);
// check if there are multiple identical paths
for (second = idx + 1; second < paths.size(); ++second) {
if (path == paths[second]) {
GTEST_LOG_(ERROR) << "duplicate paths in " << config_name << ": " << paths[idx];
retval = true;
break;
}
if (!paths[second].prefix) {
// guaranteed to fail expectations, trigger test failure with
// a message that reports the violation as an inequality.
EXPECT_STREQ((prefix + path.substr(alternate.length())).c_str(), path.c_str());
}
// check if path is <partition>/
if (android::base::StartsWith(path, prefix.c_str())) {
// rebuild path to be system/<partition>/... to check for alias
path = alternate + path.substr(prefix.size());
for (second = 0; second < paths.size(); ++second) {
if (path == paths[second]) {
GTEST_LOG_(ERROR) << "duplicate alias paths in " << config_name << ": "
<< paths[idx] << " and " << paths[second]
<< " (remove latter)";
retval = true;
break;
}
}
continue;
}
// check if path is system/<partition>/
if (android::base::StartsWith(path, alternate.c_str())) {
// rebuild path to be <partition>/... to check for alias
path = prefix + path.substr(alternate.size());
for (second = 0; second < paths.size(); ++second) {
if (path == paths[second]) break;
}
if (second >= paths.size()) {
GTEST_LOG_(ERROR) << "replace path in " << config_name << ": " << paths[idx]
<< " with " << path;
retval = true;
}
}
}
return retval;
}
static void check_two(const struct fs_path_config* paths, const std::string& prefix) {
static bool check_unique(const fs_path_config* paths, const char* type_name,
const std::string& prefix) {
std::string config("system/core/libcutils/fs_config.cpp:android_");
config += type_name;
config += "[]";
bool retval = false;
std::vector<const char*> paths_tmp;
for (size_t idx = 0; paths[idx].prefix; ++idx) {
if (idx > max_idx) {
GTEST_LOG_(WARNING) << config << ": has no end (missing null prefix)";
retval = true;
break;
}
paths_tmp.push_back(paths[idx].prefix);
}
return check_unique(paths_tmp, config, prefix) || retval;
}
#define endof(pointer, field) (offsetof(typeof(*(pointer)), field) + sizeof((pointer)->field))
static bool check_unique(const std::string& config, const std::string& prefix) {
int retval = false;
std::string data;
if (!android::base::ReadFileToString(config, &data)) return retval;
const fs_path_config_from_file* pc =
reinterpret_cast<const fs_path_config_from_file*>(data.c_str());
size_t len = data.size();
std::vector<const char*> paths_tmp;
size_t entry_number = 0;
while (len > 0) {
uint16_t host_len = (len >= endof(pc, len)) ? pc->len : INT16_MAX;
if (host_len > len) {
GTEST_LOG_(WARNING) << config << ": truncated at entry " << entry_number << " ("
<< host_len << " > " << len << ")";
const std::string unknown("?");
GTEST_LOG_(WARNING)
<< config << ": entry[" << entry_number << "]={ "
<< "len=" << ((len >= endof(pc, len))
? android::base::StringPrintf("%" PRIu16, pc->len)
: unknown)
<< ", mode=" << ((len >= endof(pc, mode))
? android::base::StringPrintf("0%" PRIo16, pc->mode)
: unknown)
<< ", uid=" << ((len >= endof(pc, uid))
? android::base::StringPrintf("%" PRIu16, pc->uid)
: unknown)
<< ", gid=" << ((len >= endof(pc, gid))
? android::base::StringPrintf("%" PRIu16, pc->gid)
: unknown)
<< ", capabilities="
<< ((len >= endof(pc, capabilities))
? android::base::StringPrintf("0x%" PRIx64, pc->capabilities)
: unknown)
<< ", prefix="
<< ((len >= offsetof(fs_path_config_from_file, prefix))
? android::base::StringPrintf(
"\"%.*s...", (int)(len - offsetof(fs_path_config_from_file, prefix)),
pc->prefix)
: unknown)
<< " }";
retval = true;
break;
}
paths_tmp.push_back(pc->prefix);
pc = reinterpret_cast<const fs_path_config_from_file*>(reinterpret_cast<const char*>(pc) +
host_len);
len -= host_len;
++entry_number;
}
return check_unique(paths_tmp, config, prefix) || retval;
}
void check_two(const fs_path_config* paths, const char* type_name, const char* prefix) {
ASSERT_FALSE(paths == nullptr);
std::string alternate = "system/" + prefix;
check_one(paths, prefix, alternate);
check_one(paths, alternate, prefix);
ASSERT_FALSE(type_name == nullptr);
ASSERT_FALSE(prefix == nullptr);
bool check_internal = check_unique(paths, type_name, prefix);
EXPECT_FALSE(check_internal);
bool check_overrides =
check_unique(std::string("/") + prefix + "etc/fs_config_" + type_name, prefix);
EXPECT_FALSE(check_overrides);
}
TEST(fs_config, vendor_dirs_alias) {
check_two(__for_testing_only__android_dirs, "vendor/");
check_two(__for_testing_only__android_dirs, "dirs", "vendor/");
}
TEST(fs_config, vendor_files_alias) {
check_two(__for_testing_only__android_files, "vendor/");
check_two(__for_testing_only__android_files, "files", "vendor/");
}
TEST(fs_config, oem_dirs_alias) {
check_two(__for_testing_only__android_dirs, "oem/");
check_two(__for_testing_only__android_dirs, "dirs", "oem/");
}
TEST(fs_config, oem_files_alias) {
check_two(__for_testing_only__android_files, "oem/");
check_two(__for_testing_only__android_files, "files", "oem/");
}
TEST(fs_config, odm_dirs_alias) {
check_two(__for_testing_only__android_dirs, "odm/");
check_two(__for_testing_only__android_dirs, "dirs", "odm/");
}
TEST(fs_config, odm_files_alias) {
check_two(__for_testing_only__android_files, "odm/");
check_two(__for_testing_only__android_files, "files", "odm/");
}