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-rw-r--r--otafault/Android.mk44
-rw-r--r--otafault/config.cpp69
-rw-r--r--otafault/config.h74
-rw-r--r--otafault/ota_io.cpp176
-rw-r--r--otafault/ota_io.h53
-rw-r--r--otafault/test.cpp34
6 files changed, 450 insertions, 0 deletions
diff --git a/otafault/Android.mk b/otafault/Android.mk
new file mode 100644
index 000000000..ba7add855
--- /dev/null
+++ b/otafault/Android.mk
@@ -0,0 +1,44 @@
+# Copyright 2015 The Android Open Source Project
+#
+# 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 languae governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+otafault_static_libs := \
+ libbase \
+ libminzip \
+ libz \
+ libselinux
+
+LOCAL_SRC_FILES := config.cpp ota_io.cpp
+LOCAL_MODULE_TAGS := eng
+LOCAL_MODULE := libotafault
+LOCAL_CLANG := true
+LOCAL_C_INCLUDES := bootable/recovery
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
+LOCAL_WHOLE_STATIC_LIBRARIES := $(otafault_static_libs)
+
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := config.cpp ota_io.cpp test.cpp
+LOCAL_MODULE_TAGS := tests
+LOCAL_MODULE := otafault_test
+LOCAL_STATIC_LIBRARIES := $(otafault_static_libs)
+LOCAL_C_INCLUDES := bootable/recovery
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+
+include $(BUILD_EXECUTABLE)
diff --git a/otafault/config.cpp b/otafault/config.cpp
new file mode 100644
index 000000000..b4567392d
--- /dev/null
+++ b/otafault/config.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 <map>
+#include <string>
+
+#include <stdio.h>
+#include <unistd.h>
+
+#include <android-base/stringprintf.h>
+
+#include "minzip/Zip.h"
+#include "config.h"
+#include "ota_io.h"
+
+#define OTAIO_MAX_FNAME_SIZE 128
+
+static ZipArchive* archive;
+static std::map<std::string, bool> should_inject_cache;
+
+static std::string get_type_path(const char* io_type) {
+ return android::base::StringPrintf("%s/%s", OTAIO_BASE_DIR, io_type);
+}
+
+void ota_io_init(ZipArchive* za) {
+ archive = za;
+ ota_set_fault_files();
+}
+
+bool should_fault_inject(const char* io_type) {
+ // archive will be NULL if we used an entry point other
+ // than updater/updater.cpp:main
+ if (archive == NULL) {
+ return false;
+ }
+ const std::string type_path = get_type_path(io_type);
+ if (should_inject_cache.find(type_path) != should_inject_cache.end()) {
+ return should_inject_cache[type_path];
+ }
+ const ZipEntry* entry = mzFindZipEntry(archive, type_path.c_str());
+ should_inject_cache[type_path] = entry != nullptr;
+ return entry != NULL;
+}
+
+bool should_hit_cache() {
+ return should_fault_inject(OTAIO_CACHE);
+}
+
+std::string fault_fname(const char* io_type) {
+ std::string type_path = get_type_path(io_type);
+ std::string fname;
+ fname.resize(OTAIO_MAX_FNAME_SIZE);
+ const ZipEntry* entry = mzFindZipEntry(archive, type_path.c_str());
+ mzReadZipEntry(archive, entry, &fname[0], OTAIO_MAX_FNAME_SIZE);
+ return fname;
+}
diff --git a/otafault/config.h b/otafault/config.h
new file mode 100644
index 000000000..4430be3fb
--- /dev/null
+++ b/otafault/config.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/*
+ * Read configuration files in the OTA package to determine which files, if any, will trigger errors.
+ *
+ * OTA packages can be modified to trigger errors by adding a top-level
+ * directory called .libotafault, which may optionally contain up to three
+ * files called READ, WRITE, and FSYNC. Each one of these optional files
+ * contains the name of a single file on the device disk which will cause
+ * an IO error on the first call of the appropriate I/O action to that file.
+ *
+ * Example:
+ * ota.zip
+ * <normal package contents>
+ * .libotafault
+ * WRITE
+ *
+ * If the contents of the file WRITE were /system/build.prop, the first write
+ * action to /system/build.prop would fail with EIO. Note that READ and
+ * FSYNC files are absent, so these actions will not cause an error.
+ */
+
+#ifndef _UPDATER_OTA_IO_CFG_H_
+#define _UPDATER_OTA_IO_CFG_H_
+
+#include <string>
+
+#include <stdbool.h>
+
+#include "minzip/Zip.h"
+
+#define OTAIO_BASE_DIR ".libotafault"
+#define OTAIO_READ "READ"
+#define OTAIO_WRITE "WRITE"
+#define OTAIO_FSYNC "FSYNC"
+#define OTAIO_CACHE "CACHE"
+
+/*
+ * Initialize libotafault by providing a reference to the OTA package.
+ */
+void ota_io_init(ZipArchive* za);
+
+/*
+ * Return true if a config file is present for the given IO type.
+ */
+bool should_fault_inject(const char* io_type);
+
+/*
+ * Return true if an EIO should occur on the next hit to /cache/saved.file
+ * instead of the next hit to the specified file.
+ */
+bool should_hit_cache();
+
+/*
+ * Return the name of the file that should cause an error for the
+ * given IO type.
+ */
+std::string fault_fname(const char* io_type);
+
+#endif
diff --git a/otafault/ota_io.cpp b/otafault/ota_io.cpp
new file mode 100644
index 000000000..04458537b
--- /dev/null
+++ b/otafault/ota_io.cpp
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 <map>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "ota_io.h"
+
+static std::map<intptr_t, const char*> filename_cache;
+static std::string read_fault_file_name = "";
+static std::string write_fault_file_name = "";
+static std::string fsync_fault_file_name = "";
+
+static bool get_hit_file(const char* cached_path, std::string ffn) {
+ return should_hit_cache()
+ ? !strncmp(cached_path, OTAIO_CACHE_FNAME, strlen(cached_path))
+ : !strncmp(cached_path, ffn.c_str(), strlen(cached_path));
+}
+
+void ota_set_fault_files() {
+ if (should_fault_inject(OTAIO_READ)) {
+ read_fault_file_name = fault_fname(OTAIO_READ);
+ }
+ if (should_fault_inject(OTAIO_WRITE)) {
+ write_fault_file_name = fault_fname(OTAIO_WRITE);
+ }
+ if (should_fault_inject(OTAIO_FSYNC)) {
+ fsync_fault_file_name = fault_fname(OTAIO_FSYNC);
+ }
+}
+
+bool have_eio_error = false;
+
+int ota_open(const char* path, int oflags) {
+ // Let the caller handle errors; we do not care if open succeeds or fails
+ int fd = open(path, oflags);
+ filename_cache[fd] = path;
+ return fd;
+}
+
+int ota_open(const char* path, int oflags, mode_t mode) {
+ int fd = open(path, oflags, mode);
+ filename_cache[fd] = path;
+ return fd; }
+
+FILE* ota_fopen(const char* path, const char* mode) {
+ FILE* fh = fopen(path, mode);
+ filename_cache[(intptr_t)fh] = path;
+ return fh;
+}
+
+int ota_close(int fd) {
+ // descriptors can be reused, so make sure not to leave them in the cache
+ filename_cache.erase(fd);
+ return close(fd);
+}
+
+int ota_fclose(FILE* fh) {
+ filename_cache.erase((intptr_t)fh);
+ return fclose(fh);
+}
+
+size_t ota_fread(void* ptr, size_t size, size_t nitems, FILE* stream) {
+ if (should_fault_inject(OTAIO_READ)) {
+ auto cached = filename_cache.find((intptr_t)stream);
+ const char* cached_path = cached->second;
+ if (cached != filename_cache.end() &&
+ get_hit_file(cached_path, read_fault_file_name)) {
+ read_fault_file_name = "";
+ errno = EIO;
+ have_eio_error = true;
+ return 0;
+ }
+ }
+ size_t status = fread(ptr, size, nitems, stream);
+ if (status != nitems && errno == EIO) {
+ have_eio_error = true;
+ }
+ return status;
+}
+
+ssize_t ota_read(int fd, void* buf, size_t nbyte) {
+ if (should_fault_inject(OTAIO_READ)) {
+ auto cached = filename_cache.find(fd);
+ const char* cached_path = cached->second;
+ if (cached != filename_cache.end()
+ && get_hit_file(cached_path, read_fault_file_name)) {
+ read_fault_file_name = "";
+ errno = EIO;
+ have_eio_error = true;
+ return -1;
+ }
+ }
+ ssize_t status = read(fd, buf, nbyte);
+ if (status == -1 && errno == EIO) {
+ have_eio_error = true;
+ }
+ return status;
+}
+
+size_t ota_fwrite(const void* ptr, size_t size, size_t count, FILE* stream) {
+ if (should_fault_inject(OTAIO_WRITE)) {
+ auto cached = filename_cache.find((intptr_t)stream);
+ const char* cached_path = cached->second;
+ if (cached != filename_cache.end() &&
+ get_hit_file(cached_path, write_fault_file_name)) {
+ write_fault_file_name = "";
+ errno = EIO;
+ have_eio_error = true;
+ return 0;
+ }
+ }
+ size_t status = fwrite(ptr, size, count, stream);
+ if (status != count && errno == EIO) {
+ have_eio_error = true;
+ }
+ return status;
+}
+
+ssize_t ota_write(int fd, const void* buf, size_t nbyte) {
+ if (should_fault_inject(OTAIO_WRITE)) {
+ auto cached = filename_cache.find(fd);
+ const char* cached_path = cached->second;
+ if (cached != filename_cache.end() &&
+ get_hit_file(cached_path, write_fault_file_name)) {
+ write_fault_file_name = "";
+ errno = EIO;
+ have_eio_error = true;
+ return -1;
+ }
+ }
+ ssize_t status = write(fd, buf, nbyte);
+ if (status == -1 && errno == EIO) {
+ have_eio_error = true;
+ }
+ return status;
+}
+
+int ota_fsync(int fd) {
+ if (should_fault_inject(OTAIO_FSYNC)) {
+ auto cached = filename_cache.find(fd);
+ const char* cached_path = cached->second;
+ if (cached != filename_cache.end() &&
+ get_hit_file(cached_path, fsync_fault_file_name)) {
+ fsync_fault_file_name = "";
+ errno = EIO;
+ have_eio_error = true;
+ return -1;
+ }
+ }
+ int status = fsync(fd);
+ if (status == -1 && errno == EIO) {
+ have_eio_error = true;
+ }
+ return status;
+}
+
diff --git a/otafault/ota_io.h b/otafault/ota_io.h
new file mode 100644
index 000000000..84187a76e
--- /dev/null
+++ b/otafault/ota_io.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/*
+ * Provide a series of proxy functions for basic file accessors.
+ * The behavior of these functions can be changed to return different
+ * errors under a variety of conditions.
+ */
+
+#ifndef _UPDATER_OTA_IO_H_
+#define _UPDATER_OTA_IO_H_
+
+#include <stdio.h>
+#include <sys/stat.h>
+
+#define OTAIO_CACHE_FNAME "/cache/saved.file"
+
+void ota_set_fault_files();
+
+int ota_open(const char* path, int oflags);
+
+int ota_open(const char* path, int oflags, mode_t mode);
+
+FILE* ota_fopen(const char* filename, const char* mode);
+
+int ota_close(int fd);
+
+int ota_fclose(FILE* fh);
+
+size_t ota_fread(void* ptr, size_t size, size_t nitems, FILE* stream);
+
+ssize_t ota_read(int fd, void* buf, size_t nbyte);
+
+size_t ota_fwrite(const void* ptr, size_t size, size_t count, FILE* stream);
+
+ssize_t ota_write(int fd, const void* buf, size_t nbyte);
+
+int ota_fsync(int fd);
+
+#endif
diff --git a/otafault/test.cpp b/otafault/test.cpp
new file mode 100644
index 000000000..6514782bf
--- /dev/null
+++ b/otafault/test.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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 <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "ota_io.h"
+
+int main(int /* argc */, char** /* argv */) {
+ int fd = open("testdata/test.file", O_RDWR);
+ char buf[8];
+ const char* out = "321";
+ int readv = ota_read(fd, buf, 4);
+ printf("Read returned %d\n", readv);
+ int writev = ota_write(fd, out, 4);
+ printf("Write returned %d\n", writev);
+ close(fd);
+ return 0;
+}
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