Merge "storageproxyd: Use alternate data path if in DSU state" am: 3ecaae4fdf (058e84bf) · Commits · e / os / android_system_core

trusty/storage/proxy/Android.bp

+4 −1

Original line number	Diff line number	Diff line
		@@ -35,7 +35,10 @@ cc_binary {
		"liblog",
		"libhardware_legacy",
		],
		header_libs: ["libcutils_headers"],
		header_libs: [
		"libcutils_headers",
		"libgsi_headers",
		],

		static_libs: [
		"libfstab",

trusty/storage/proxy/checkpoint_handling.cpp

+15 −0

Original line number	Diff line number	Diff line
		@@ -18,9 +18,12 @@
		#include "log.h"

		#include <fstab/fstab.h>
		#include <unistd.h>
		#include <cstring>
		#include <string>

		#include <libgsi/libgsi.h>

		namespace {

		bool checkpointingDoneForever = false;
		@@ -75,3 +78,15 @@ int is_data_checkpoint_active(bool* active) {

		return 0;
		}

		/**
		* is_gsi_running() - Check if a GSI image is running via DSU.
		*
		* This function is equivalent to android::gsi::IsGsiRunning(), but this API is
		* not yet vendor-accessible although the underlying metadata file is.
		*
		*/
		bool is_gsi_running() {
		/* TODO(b/210501710): Expose GSI image running state to vendor storageproxyd */
		return !access(android::gsi::kGsiBootedIndicatorFile, F_OK);
		}

trusty/storage/proxy/checkpoint_handling.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,8 @@ extern "C" {
		*/
		int is_data_checkpoint_active(bool* active);

		bool is_gsi_running();

		#ifdef __cplusplus
		}
		#endif

trusty/storage/proxy/proxy.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -104,8 +104,11 @@ static int drop_privs(void) {
		return -1;
		}

		/* no-execute for user, no access for group and other */
		umask(S_IXUSR \| S_IRWXG \| S_IRWXO);
		/*
		* No access for group and other. We need execute access for user to create
		* an accessible directory.
		*/
		umask(S_IRWXG \| S_IRWXO);

		return 0;
		}

trusty/storage/proxy/storage.c

+45 −1

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@
		#include <errno.h>
		#include <fcntl.h>
		#include <inttypes.h>
		#include <libgen.h>
		#include <stdbool.h>
		#include <stdlib.h>
		#include <string.h>
		@@ -24,13 +25,16 @@
		#include <sys/types.h>
		#include <unistd.h>

		#include "log.h"
		#include "checkpoint_handling.h"
		#include "ipc.h"
		#include "log.h"
		#include "storage.h"

		#define FD_TBL_SIZE 64
		#define MAX_READ_SIZE 4096

		#define ALTERNATE_DATA_DIR "alternate/"

		enum sync_state {
		SS_UNUSED = -1,
		SS_CLEAN = 0,
		@@ -44,6 +48,8 @@ static enum sync_state fs_state;
		static enum sync_state dir_state;
		static enum sync_state fd_state[FD_TBL_SIZE];

		static bool alternate_mode;

		static struct {
		struct storage_file_read_resp hdr;
		uint8_t data[MAX_READ_SIZE];
		@@ -216,6 +222,7 @@ int storage_file_open(struct storage_msg *msg,
		const void *r, size_t req_len)
		{
		char *path = NULL;
		char* parent_path;
		const struct storage_file_open_req *req = r;
		struct storage_file_open_resp resp = {0};

		@@ -234,6 +241,24 @@ int storage_file_open(struct storage_msg *msg,
		goto err_response;
		}

		/*
		* TODO(b/210501710): Expose GSI image running state to vendor
		* storageproxyd. We want to control data file paths in vendor_init, but we
		* don't have access to the necessary property there yet. When we have
		* access to that property we can set the root data path read-only and only
		* allow creation of files in alternate/. Checking paths here temporarily
		* until that is fixed.
		*
		* We are just checking for "/" instead of "alternate/" because we still
		* want to still allow access to "persist/" in alternate mode (for now, this
		* may change in the future).
		*/
		if (alternate_mode && !strchr(req->name, '/')) {
		ALOGE("%s: Cannot open root data file \"%s\" in alternate mode\n", __func__, req->name);
		msg->result = STORAGE_ERR_ACCESS;
		goto err_response;
		}

		int rc = asprintf(&path, "%s/%s", ssdir_name, req->name);
		if (rc < 0) {
		ALOGE("%s: asprintf failed\n", __func__);
		@@ -246,7 +271,23 @@ int storage_file_open(struct storage_msg *msg,
		if (req->flags & STORAGE_FILE_OPEN_TRUNCATE)
		open_flags \|= O_TRUNC;

		parent_path = dirname(path);
		if (req->flags & STORAGE_FILE_OPEN_CREATE) {
		/*
		* Create the alternate parent dir if needed & allowed.
		*
		* TODO(b/210501710): Expose GSI image running state to vendor
		* storageproxyd. This directory should be created by vendor_init, once
		* it has access to the necessary bit of information.
		*/
		if (strstr(req->name, ALTERNATE_DATA_DIR) == req->name) {
		rc = mkdir(parent_path, S_IRWXU);
		if (rc && errno != EEXIST) {
		ALOGE("%s: Could not create parent directory \"%s\": %s\n", __func__, parent_path,
		strerror(errno));
		}
		}

		/* open or create */
		if (req->flags & STORAGE_FILE_OPEN_CREATE_EXCLUSIVE) {
		/* create exclusive */
		@@ -467,6 +508,9 @@ err_response:

		int storage_init(const char *dirname)
		{
		/* If there is an active DSU image, use the alternate fs mode. */
		alternate_mode = is_gsi_running();

		fs_state = SS_CLEAN;
		dir_state = SS_CLEAN;
		for (uint i = 0; i < FD_TBL_SIZE; i++) {