CN118244980A - Data presetting method, electronic equipment and storage medium - Google Patents

Abstract

The present invention relates to a data presetting method, an electronic device and a storage medium. The data presetting method comprises: obtaining a backup partition image file and a boot communication partition image file containing backup information, wherein the backup partition image file and the boot communication partition image file are generated according to the preset data directory, the boot communication partition image and the preset data image configuration file preset to the user data partition as required; burning the backup partition image file and the boot communication partition image file to the backup partition of the device; and presetting data to the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition. The present invention directly presets data to the backup partition, and then presets data from the backup partition to the user data partition. Even in the scenario where the user data partition is encrypted, data presetting can be realized, thereby realizing data presetting for the encrypted user data partition, and will not cause the system firmware to become permanently larger.

Description

Data presetting method, electronic device and storage medium

Technical Field

The present invention relates to the field of embedded technology, and in particular to a data presetting method, an electronic device and a storage medium.

Background technique

Permanent memory devices such as eMMC (embedded multimedia card) and solid-state hard disk used in electronic devices are the core components of electronic devices. Electronic devices use permanent memory devices to store device firmware and user data, and the area storing user data is called user data partition (such as data). In some scenarios, in order to protect the data security in the user data partition (such as data), the user data area is usually encrypted. Once the device encrypts the user data partition, a paired encryption and decryption system is required to use the data in the user data partition. In order to ensure data security, when the end user uses the device for the first time, the encryption service and system usually require that the user data partition must be a clean user data partition that has just been erased and formatted before the user data partition is encrypted. During the system startup process, the system will map the physical block device corresponding to the user data partition (such as /dev/block/by-name/data) to a virtual block device (such as /dev/block/dm-1) through the device mapping mechanism (such as device mapper) of the operating system kernel. When writing data to the virtual block device, each data block will first be encrypted and then stored on the physical block device. Similarly, when reading data from a virtual block device, each data is first decrypted and then the decrypted data is returned.

When electronic devices leave the factory, the user data partition is usually erased and the file system is formatted so that the end user can use a complete and clean user data partition, that is, the user data partition will not have any user data pre-installed when the device leaves the factory. However, some manufacturers hope to pre-install certain data in the user data partition before the device leaves the factory (that is, during the production process of the device and before it is finally shipped to the end user) to meet the product definition made by the manufacturer for the device developed by itself.

Existing data pre-setting methods for user data partitions generally fall into the following two categories.

The first type of method requires that the user data partition is unencrypted. This type of method boots the device into recovery mode during device startup and completes data presetting in recovery mode, so that after the device enters the normal system, the pre-set data in the user data area can be directly used. Recovery mode usually cannot support complex encryption and decryption systems, which means that this type of method cannot pre-set data on the encrypted user data partition, because the encryption of the user data partition requires that the user data partition must be a clean user data partition that has just been erased and formatted before being encrypted, and no user data can be pre-stored. All data created by the user must first be automatically encrypted by the corresponding encryption system before being written to the encrypted user data area, and then the encrypted data is written to the actual user data physical partition.

Although the second method can support encrypted user data partitions, it requires that the data that needs to be preset in the user data partition be first built into the system firmware (such as the system or vendor or odm firmware of the Android system), and then after the system starts normally and the supporting encryption and decryption system works normally, the data that needs to be preset in the user data partition built into the system firmware is copied to the user data partition to complete the data preset. The biggest problem with this method is that it will cause the system firmware of the device to become larger. Usually, the data that needs to be preset in the user data partition is relatively large, which will cause the system firmware to become unacceptably large. This means that when the system firmware is fully FOTA upgraded, the FOTA upgrade package will become larger. When the FOTA upgrade package becomes larger, it means that more time and space resources are required when the upgrade package is generated, stored, transmitted, and actually upgraded. In addition, the data that needs to be preset in the user data partition is usually ordinary data, which is not essentially a component of the system firmware. Mixing ordinary preset data with system firmware is obviously a bad design from a software engineering perspective.

Therefore, how to implement data presetting for the encrypted user data partition without having to embed the presetting data into the system firmware, which would cause the system firmware to permanently become larger, has become one of the problems that need to be solved at present.

Summary of the invention

The present invention provides a data presetting method, an electronic device and a storage medium, which can realize data presetting for an encrypted user data partition without causing permanent enlargement of system firmware.

In one aspect of the present invention, a data presetting method is provided. The method includes: obtaining a backup partition image file and a boot communication partition image file containing backup information, wherein the backup partition image file and the boot communication partition image file are generated according to the preset data directory, boot communication partition image and preset data image configuration file preset to the user data partition as needed; burning the backup partition image file and the boot communication partition image file to the backup partition of the device; and presetting data to the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition.

In another aspect of the present invention, an electronic device is provided, which includes a memory configured to store an executable program and a processor configured to execute the program to perform the above-mentioned data presetting method.

In another aspect of the present invention, a computer-readable medium is provided, wherein a computer program is stored on the medium, and the computer program is executed by a processor to implement the above-mentioned data presetting method.

According to the present invention, a backup partition image file and a boot communication partition image file containing backup information are obtained, and the backup partition image file and the boot communication partition image file are generated according to the preset data directory, boot communication partition image and preset data image configuration file preset to the user data partition as needed, and the backup partition image file and the boot communication partition image file are burned to the backup partition of the device, and the user data partition is preset based on the backup partition image file and the boot communication partition image file in the backup partition. The technical solution of the present invention directly presets data to the backup partition, and then presets data from the backup partition to the user data partition. Even in the scenario where the user data partition is encrypted, data preset can be realized, thereby realizing data presetting for the encrypted user data partition, and will not cause the system firmware to become permanently larger.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of steps of a data presetting method according to an embodiment of the present invention;

FIG2 is a schematic flow chart of a data presetting method according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

In the prior art, one method is to boot the device into a recovery mode during device startup and complete data presetting in the recovery mode, but data presetting cannot be performed on the encrypted user data partition. Another method is to first build the data that needs to be preset to the user data partition into the system firmware, and then, after the system starts normally and the supporting encryption and decryption system works normally, copy the data that needs to be preset to the user data partition that is built into the system firmware to the user data partition, but this will cause the system firmware to become unacceptably large.

In order to solve at least the above technical problems, the present disclosure provides a data presetting method. According to an embodiment of the present disclosure, a backup partition image file and a boot communication partition image file containing backup information are obtained, and the backup partition image file and the boot communication partition image file are generated according to the preset data directory, boot communication partition image and preset data image configuration file preset to the user data partition as needed, and the backup partition image file and the boot communication partition image file are burned to the backup partition of the device, and the user data partition is preset based on the backup partition image file and the boot communication partition image file in the backup partition. In this way, data is directly preset to the backup partition, and then data is preset from the backup partition to the user data partition. Even in the scenario where the user data partition is encrypted, data presetting can be achieved, thereby achieving data presetting for the encrypted user data partition, and will not cause the system firmware to become permanently larger.

Hereinafter, the technical solution according to the present disclosure will be described with reference to specific embodiments and in conjunction with the accompanying drawings.

Fig. 1 is a flow chart showing a data presetting method 100 according to an embodiment of the present disclosure. Referring to Fig. 1 , the method 100 includes the following steps 102 to 106 .

In step 102, a backup partition image file and a boot communication partition image file containing backup information are obtained, wherein the backup partition image file and the boot communication partition image file are generated according to the preset data directory, the boot communication partition image and the preset data image configuration file preset to the user data partition as needed.

In some embodiments, before step 102, the method 100 may further include: making the backup partition image file and the boot communication partition image. In some embodiments, making the backup partition image file and the boot communication partition image includes: generating a preset data image preset file according to the name, size and file system type of the backup partition; generating a preset data directory according to a preset directory hierarchy for the preset data; receiving a boot communication partition image; and generating the backup partition image file and the boot communication partition image file according to the preset data directory, the boot communication partition image and the preset data image preset file. In this way, the preset data directory, the boot communication partition image and the preset data image preset file include relevant information of the preset data and the backup partition, which facilitates the subsequent generation of the backup partition image file for data preset and the boot communication partition image file containing the backup information.

In some embodiments, the preset data directory is compressed to obtain a preset data compression package. If the size of the preset data compression package is smaller than the size of the backup partition, an original backup partition image file is generated, and the size of the original backup partition image file is smaller than the size of the backup partition and larger than the size of the preset data compression package. The original backup partition image file is formatted according to the file system type of the backup partition to obtain a readable and writable file system backup partition image file containing the file system type. The readable and writable file system backup partition image file is mounted to a preset mount directory, and the preset data compression package is copied to a preset path of the preset mount directory; and the readable and writable file system backup partition image file is unmounted. The readable and writable file system backup partition image file containing the preset data compression package is renamed according to the name of the backup partition to obtain a backup partition image file. A backup partition encrypted data area preset instruction is written at a first preset position of the boot communication partition, and backup partition information is written at a second preset position of the boot communication partition to generate a boot communication partition image file containing backup information. In this way, the preset data compression package with the preset name is preset into the read-write file system backup partition image file, so that the preset data can be burned into the backup partition later.

In some embodiments, before writing the backup partition information to the second preset position of the boot communication partition, the method further includes: generating the backup partition information according to the backup partition information magic number, the backup body digital summary algorithm type, the backup body digital summary ciphertext size, the backup body digital summary ciphertext and the backup body. In this way, it is beneficial to pre-set the preset data into the backup partition according to the generated backup partition information, without having to be built into the system firmware, thereby preventing the system firmware from being too large.

In step 104, the backup partition image file and the boot communication partition image file are burned to the backup partition of the device.

In step 106, data is preset for the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition.

In some embodiments, according to the backup partition encrypted data area preset instruction present at the preset position in the boot communication partition, the backup partition information is read from the boot communication partition. According to the name of the backup partition in the backup body in the backup partition information and the file system type of the backup partition, the file system capacity of the backup partition is expanded to the actual size of the backup partition. The user data partition is erased and formatted, and the backup partition encrypted data area preset instruction is cleared, and the device is restarted. The corresponding preset data in the backup partition is written to the mount directory representing the user data partition to complete the data preset of the user data partition. In some embodiments, the corresponding preset data compression package in the backup partition is decompressed to the mount directory representing the user data partition, and the decompressed data is encrypted by the data encryption and decryption service to write the encrypted data to the user data partition to complete the data preset of the encrypted user data partition. In some embodiments, according to the factory reset instruction present at the preset position in the boot communication partition, the user data partition is erased and formatted, and the corresponding preset data compression package in the backup partition is decompressed to the mount directory representing the user data partition to complete the data preset of the user data partition at the factory. In this way, data presetting of the encrypted user data partition is achieved without causing permanent enlargement of the system firmware.

In some embodiments, the device is started, and if the backup partition encrypted data area preset instruction or the factory reset instruction exists in the first preset position of the boot communication partition, the device is guided into the recovery mode. In the recovery mode, if the backup partition encrypted data area preset instruction exists in the first preset position of the boot communication partition, the backup partition information is read from the second preset position of the boot communication partition, and the file system capacity of the backup partition is expanded to the actual size of the backup partition according to the backup partition information. The user data partition is erased and formatted again, and the preset completion mark of the third preset position in the boot communication partition is cleared, the backup partition encrypted data area preset instruction of the first preset position in the boot communication partition is cleared, the encrypted data preset process and the recovery mode are exited, and the device is restarted to perform data preset on the user data partition. If the factory reset instruction exists in the first preset position of the boot communication partition, the factory reset operation is performed, and the factory reset operation erases and formats the user data partition again, but does not erase and format the backup partition again. The backup partition information is read from the second preset position in the boot communication partition, and the backup partition information magic number in the backup partition information is checked to see if it is consistent with the preset magic number. If not, the factory reset instruction in the first preset position in the boot communication partition is cleared, and the factory reset process is exited. If consistent, the preset completion mark in the third preset position in the boot communication partition is cleared, the factory reset instruction in the first preset position in the boot communication partition is cleared, and the factory reset process is exited, and the device is restarted to perform data preset on the user data partition. In some embodiments, when the factory reset operation is performed, the device is restarted after the factory reset instruction is written in the first preset position in the boot communication partition. In this way, it is determined whether to restore the factory settings or to preset the data according to whether the factory reset instruction or the backup partition encrypted data area preset instruction exists in the first preset position of the boot communication partition. It is simple and convenient to perform factory reset. Since the backup partition already contains a preset data compression package, the preset data compression package in the backup partition can be used to re-embed the data into the user data partition after the factory reset.

In some embodiments, during the system startup process, a preset data encryption and decryption service is used to ensure that the user data area is encrypted according to a preset encryption method. After the encryption is completed, the physical block device corresponding to the user data area is mapped to a virtual block device through the device mapping mechanism of the operating system kernel, and the virtual block device is mounted to the preset mount directory representing the user data partition. Use the encrypted data pre-set service to detect whether the preset mount directory representing the user data partition has mounted the virtual block device. If the mounting is completed, the data pre-set process is started to pre-set data for the user data partition. In this way, data pre-set for the encrypted user data partition can be achieved, and at the same time, the preset data does not need to be built into the system firmware, avoiding the additional occupation of time and space resources when the system firmware is fully upgraded by FOTA.

In some embodiments, the encrypted data presetting service is used to check whether the preset completion mark exists at the third preset position in the boot communication partition. If it exists, the encrypted data presetting service is exited. If it does not exist, check whether the preset mount directory representing the user data partition has mounted the virtual block device. If the mounting is not completed, wait for a preset time and return to execute the encrypted data presetting service to check whether the preset completion mark exists at the third preset position in the boot communication partition. If the mounting is completed, read the backup partition information from the second preset position in the boot communication partition, and check whether the backup partition magic number in the backup partition information is consistent with the preset magic number. If not consistent, exit the encrypted data presetting service. If consistent, calculate the digital summary of the backup body in the backup partition information according to the digital summary algorithm corresponding to the backup body digital summary algorithm type in the backup partition information, and encrypt the calculated backup body digital summary using the preset symmetric encryption algorithm and key for the backup partition information to obtain the backup body digital summary ciphertext and the backup body digital summary ciphertext size. If the calculated backup body digital summary ciphertext size is the same as the backup body digital summary ciphertext size in the backup partition information, and the calculated backup body digital summary ciphertext is the same as the backup body digital summary ciphertext in the backup partition information, then determine the block device node corresponding to the backup partition according to the name of the backup partition of the backup body in the backup partition information, and check whether the backup partition has been mounted. If not mounted, then mount the backup partition, and check whether there is a corresponding preset data compression package according to the path of the preset data compression package of the backup body in the backup partition information in the backup partition. If not, exit the encrypted data presetting service. If so, calculate the digital summary of the preset data compression package in the backup partition according to the digital summary algorithm corresponding to the backup body digital summary algorithm type in the backup partition information. If the calculated preset data compression package digital summary is the same as the preset data compression package digital summary of the backup body in the backup partition information, then decompress the preset data compression package in the backup partition to the preset mounting directory representing the user data partition, and automatically encrypt the decompressed preset data through the preset data encryption and decryption service and write it into the actual user data partition. The preset completion mark is written into the third preset position in the boot communication partition to complete the data preset of the user data partition and exit the encrypted data preset service. In this way, the reliability of data preset is guaranteed by checking the legitimacy of the backup partition information.

In some embodiments, after step 108, the method 100 further includes: when using the service or application of the preset data in the user data area, checking whether there is a preset completion mark at the third preset position in the boot communication partition; if there is, continuing to use the service or application of the preset data in the user data area; if not, waiting for a preset time and returning to execute checking whether there is a preset completion mark at the third preset position in the boot communication partition.

Hereinafter, application scenarios of the data presetting method and device according to the embodiments of the present invention will be described by way of examples.

Fig. 2 is a flow chart showing a data presetting method according to an embodiment of the present invention. As shown in Fig. 2, the method includes the following steps 201 to 208.

In step 201, a preset data directory, a boot communication partition image (such as misc.img) and a preset data image preset file are constructed, which specifically includes the following (1) to (3).

(1) Generate a preset data image preset file according to the name (such as backup), size and file system type of the backup partition.

The name of the backup partition corresponds to the name of the actual physical partition of the device. The actual physical partition used as the backup partition must be a non-encrypted partition with a readable and writable file system.

(2) Generate a preset data directory according to the preset directory hierarchy, that is, organize all preset data into the preset data directory according to the preset directory hierarchy.

(3) Receive the boot communication partition image.

In step 202, a backup partition image file and a boot communication partition image file containing backup information are generated according to the preset data directory, the boot communication partition image and the preset data image preset file, which specifically includes the following (1) to (9).

(1) Compress the preset data directory to obtain a preset data compression package.

Specifically, the preset data directory is compressed according to a preset compression algorithm type and named with a preset name to obtain a preset data compression package.

(2) If the size of the pre-set data compression package is greater than or equal to the size of the backup partition, an error message is displayed and the data pre-set process is exited.

(3) If the size of the preset data compression package is smaller than the size of the backup partition, an original backup partition image file (such as backup_raw.img) is generated. The size of the original backup partition image file is smaller than the size of the backup partition and larger than the size of the preset data compression package.

(4) The original backup partition image file is formatted according to the file system type of the backup partition to obtain a readable and writable file system backup partition image file (such as bakcup_fs.img) containing the file system type.

(5) The readable and writable file system backup partition image file is mounted to a preset mounting directory, and the preset data compression package is copied to a preset path of the preset mounting directory.

(6) Uninstalling the readable and writable file system backup partition image file, thereby presetting the preset data compression package into the readable and writable file system backup partition image file.

(7) The readable and writable file system backup partition image file containing the preset data compression package is renamed according to the name of the backup partition to obtain a backup partition image file (such as backup.img).

(8) Generate backup partition information according to the backup partition information magic number, the backup body digital summary algorithm type, the backup body digital summary ciphertext size, the backup body digital summary ciphertext and the backup body.

The backup body is composed of the name of the backup partition, the file system type of the backup partition, the path of the preset data compression package in the backup partition, and the digital summary of the preset data compression package. The digital summary of the preset data compression package is calculated according to the digital summary algorithm corresponding to the backup body digital summary algorithm type, and the obtained digital summary of the preset data compression package is saved in the backup body. The digital summary of the backup body is calculated according to the digital summary algorithm corresponding to the backup body digital summary algorithm type, and the calculated backup body digital summary is encrypted using the preset symmetric encryption algorithm and key for the backup partition information to obtain the backup body digital summary ciphertext and the backup body digital summary ciphertext size.

(9) Write the backup partition encrypted data area preset instruction at the first preset position of the boot communication partition, and write the backup partition information at the second preset position of the boot communication partition to generate a boot communication partition image file (such as misc.img) containing the backup information.

In step 203, the backup partition image file and the boot communication partition image file are burned to the backup partition of the device.

In step 204, the device is started, and in the boot program (such as uboot), it is determined whether there is a backup partition encrypted data area preset instruction or a factory reset instruction in the first preset position of the boot communication partition. If so, step 205 is executed. If not, the boot process is continued to boot the device into the system and step 206 is executed.

In step 205, the device is booted to enter a recovery mode (such as recovery), which specifically includes the following (1) to (4).

(1) Determine whether there is a backup partition encrypted data area preset instruction at the first preset position of the boot communication partition. If so, execute (2) to (3). If not, execute (4).

(2) Reading the backup partition information from the second preset position of the boot communication partition, and expanding the file system capacity of the backup partition to the actual size of the backup partition according to the backup partition information, specifically including the following (2-1) to (2-4).

(2-1) Check whether the magic number of the backup partition information is the preset magic number. If not, execute (2-2). If yes, execute (2-3) to (2-4).

(2-2) Clear the backup partition encrypted data area preset instruction in the first preset position in the boot communication partition, and exit the encrypted data preset process and recovery mode.

(2-3) Calculate the digital digest of the backup body in the backup partition information according to the digital digest algorithm corresponding to the backup body digital digest algorithm type in the backup partition information, and encrypt the calculated digital digest of the backup body using the preset symmetric encryption algorithm and key for the backup partition information to obtain the backup body digital digest ciphertext and the backup body digital summary ciphertext size.

(2-4) Compare the calculated backup digital summary ciphertext size to see if it is the same as the backup digital summary ciphertext size in the backup partition information. If not, clear the backup partition encrypted data area preset instruction in the first preset position in the boot communication partition, and exit the encrypted data preset process and recovery mode. If they are the same, check whether the calculated backup digital summary ciphertext is exactly the same as the backup digital summary ciphertext in the backup partition information. If not, clear the backup partition encrypted data area preset instruction in the first preset position in the boot communication partition, and exit the encrypted data preset process and recovery mode. If so, expand the file system capacity of the backup partition to the actual size of the backup partition based on the name of the backup partition of the backup body in the backup partition information and the file system type of the backup partition.

(3) Re-erase and format the user data partition (such as data), clear the preset completion mark at the third preset position in the boot communication partition, clear the backup partition encrypted data area preset instruction at the first preset position in the boot communication partition, exit the encrypted data preset process and recovery mode, and restart the device.

(4) Determine whether there is a factory reset instruction at the first preset position of the guide communication partition. If not, exit the factory reset process. If so, execute (4-1) to (4-2).

(4-1) A factory reset operation, which re-erases and formats the user data partition but does not re-erase and format the backup partition.

(4-2) Read the backup partition information from the second preset position in the boot communication partition, check whether the backup partition information magic number in the backup partition information is consistent with the preset magic number, if not, clear the factory reset instruction at the first preset position in the boot communication partition, and exit the factory reset process, if consistent, clear the preset completion mark at the third preset position in the boot communication partition, clear the factory reset instruction at the first preset position in the boot communication partition, exit the factory reset process, and restart the device.

When performing a factory reset operation, a factory reset instruction is written to the first preset location in the boot communication partition, and then the device is restarted.

In step 206, during the system startup process, the preset data encryption and decryption service is used to ensure that the user data area is encrypted according to the preset encryption method. After the encryption is completed, the physical block device corresponding to the user data area (such as /dev/block/by-name/data) is mapped to a virtual block device (such as /dev/block/dm-1) through the device mapping mechanism of the operating system kernel (such as device mapper), and the virtual block device is mounted to the preset mount directory representing the user data partition (such as data).

In step 207, the encrypted data pre-setting service is used to detect whether the preset mount directory representing the user data partition has been mounted on the virtual block device. If it has been mounted, the data pre-setting process is started to pre-set data for the user data partition, which specifically includes the following (1) to (3).

(1) Use the encrypted data presetting service to check whether there is a presetting completion mark at the third preset position in the boot communication partition. If so, exit the encrypted data presetting service. If not, execute (2).

(2) Check whether the preset mount directory representing the user data partition has been mounted on the virtual block device. If not, wait for a preset time and return to execute (1). If it has been mounted, execute (3).

(3) Read the backup partition information from the second preset position in the boot communication partition, and check whether the backup partition magic number in the backup partition information is consistent with the preset magic number. If not, exit the encrypted data presetting service. If consistent, execute (3-1) to (3-5).

(3-1) Calculate the digital digest of the backup body in the backup partition information according to the digital digest algorithm corresponding to the backup body digital digest algorithm type in the backup partition information, and encrypt the calculated digital digest of the backup body using the preset symmetric encryption algorithm and key for the backup partition information to obtain the backup body digital digest ciphertext and the backup body digital digest ciphertext size.

(3-2) If the calculated backup body digital summary ciphertext size is the same as the backup body digital summary ciphertext size in the backup partition information, and the calculated backup body digital summary ciphertext is the same as the backup body digital summary ciphertext in the backup partition information, then determine the block device node corresponding to the backup partition according to the name of the backup partition of the backup body in the backup partition information (such as /dev/block/by-name/backup), and check whether the backup partition has been mounted. If not, mount the backup partition, and check whether there is a corresponding preset data compression package according to the path of the preset data compression package of the backup body in the backup partition information in the backup partition. If not, exit the encrypted data presetting service. If so, calculate the digital summary of the preset data compression package in the backup partition according to the digital summary algorithm corresponding to the backup body digital summary algorithm type in the backup partition information.

(3-3) If the calculated digital digest of the preset data compression package is the same as the digital digest of the preset data compression package of the backup body in the backup partition information, the preset data compression package in the backup partition is decompressed to the preset mount directory representing the user data partition, and the decompressed preset data is automatically encrypted through the preset data encryption and decryption service and written into the actual user data partition, and a preset completion mark is written into the third preset position in the boot communication partition to complete the data preset of the user data partition, and the encrypted data preset service is exited.

(3-4) If the calculated digital summary of the preset data compression package is different from the digital summary of the preset data compression package of the backup body in the backup partition information, the encrypted data presetting service is exited.

(3-5) If the calculated backup volume digital summary ciphertext size is different from the backup volume digital summary ciphertext size in the backup partition information, or the calculated backup volume digital summary ciphertext is different from the backup volume digital summary ciphertext in the backup partition information, then exit the encrypted data pre-setting service.

In step 208, when using the service or application of the preset data in the user data area, check whether there is a preset completion mark at the third preset position in the boot communication partition. If so, continue to use the service or application of the preset data in the user data area. If not, wait for a preset time and return to check whether there is a preset completion mark at the third preset position in the boot communication partition.

According to another aspect of the present invention, FIG3 is a schematic diagram showing an electronic device 300 according to an embodiment of the present invention. Referring to FIG3, the electronic device 300 includes a memory 302 and a processor 304. The memory 302 is configured to store a computer program that can be run on the processor 304. When the processor 304 executes the computer program, each step of the data presetting method described above is implemented.

According to another aspect of the present invention, a computer readable medium is provided, wherein a computer program is stored on the computer readable medium, and the computer program is executed by a processor to implement the data presetting method described above.

In summary, the data presetting method, electronic device and storage medium provided by the present invention obtain a backup partition image file and a boot communication partition image file containing backup information, the backup partition image file and the boot communication partition image file are generated according to the preset data directory, boot communication partition image and preset data image configuration file of the user data partition as needed, the backup partition image file and the boot communication partition image file are burned to the backup partition of the device, and the user data partition is preset based on the backup partition image file and the boot communication partition image file in the backup partition, that is, the data is directly preset to the backup partition, and then the data is preset from the backup partition to the user data partition, even in the scenario where the user data partition is encrypted, data presetting can be achieved, thereby achieving data presetting for the encrypted user data partition, and will not cause the system firmware to become permanently larger. In addition, it is simple and convenient when restoring the factory settings, because the backup partition already contains a preset data compression package, so after restoring the factory settings, the preset data compression package in the backup partition can be used to re-embed the data into the user data partition.

The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims (14)

1. A data presetting method, characterized by comprising: Acquire a backup partition image file and a boot communication partition image file containing backup information, wherein the backup partition image file and the boot communication partition image file are generated according to a preset data directory, a boot communication partition image, and a preset data image configuration file preset to a user data partition as required; Burning the backup partition image file and the boot communication partition image file to the backup partition of the device; and Data is preset for the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition. 2. The method according to claim 1, characterized in that presetting data for the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition comprises: Reading the backup partition information from the boot communication partition according to the backup partition encrypted data area preset instruction existing at the preset position in the boot communication partition; According to the name of the backup partition in the backup body in the backup partition information and the file system type of the backup partition, the file system capacity of the backup partition is expanded to the actual size of the backup partition; Erasing and formatting the user data partition, clearing the preset instructions of the encrypted data area of the backup partition, and restarting the device; and The corresponding preset data in the backup partition is written into the mount directory representing the user data partition to complete the data preset of the user data partition. 3. The method according to claim 2, wherein writing the corresponding preset data in the backup partition into the mount directory representing the user data partition comprises: decompressing the corresponding preset data compression package in the backup partition to a mount directory representing the user data partition; and The decompressed data is encrypted by the data encryption and decryption service to write the encrypted data into the user data partition, thereby completing the data presetting of the encrypted user data partition. 4. The method according to claim 1, characterized in that presetting data for the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition comprises: Erasing and formatting the user data partition according to a factory reset instruction present at a preset position in the boot communication partition; and Decompress the corresponding preset data compression package in the backup partition to the mount directory representing the user data partition to complete the data preset of the user data partition at the factory. 5. The method according to claim 1, further comprising: Producing the backup partition image file and the boot communication partition image file includes: Generate a preset data mirror preset file according to the name, size and file system type of the backup partition; Generate a preset data directory according to the preset directory hierarchy; receiving a boot communication partition image; and The backup partition image file and the boot communication partition image file are generated according to the preset data directory, the boot communication partition image and the preset data image preset file. 6. The method according to claim 5, characterized in that generating the backup partition image file and the boot communication partition image file according to the preset data directory, the boot communication partition image and the preset data image preset file comprises: Compressing the preset data directory to obtain a preset data compression package; If the size of the preset data compression package is smaller than the size of the backup partition, an original backup partition image file is generated, wherein the size of the original backup partition image file is smaller than the size of the backup partition and larger than the size of the preset data compression package; Formatting the original backup partition image file according to the file system type of the backup partition to obtain a readable and writable file system backup partition image file containing the file system type; Mounting the readable and writable file system backup partition image file to a preset mount directory, and copying the preset data compression package to a preset path of the preset mount directory; Uninstalling the readable and writable file system backup partition image file; Rename the readable and writable file system backup partition image file containing the preset data compression package according to the name of the backup partition to obtain a backup partition image file; and The backup partition encrypted data area preset instruction is written in the first preset position of the boot communication partition, and the backup partition information is written in the second preset position of the boot communication partition to generate a boot communication partition image file containing the backup information. 7. The method according to claim 6, characterized in that before writing the backup partition information to the second preset location of the boot communication partition, it also includes: The backup partition information is generated according to the backup partition information magic number, the backup body digital summary algorithm type, the backup body digital summary ciphertext size, the backup body digital summary ciphertext and the backup body. 8. The method according to claim 6, wherein presetting data for the user data partition based on the backup partition image file and the boot communication partition image file in the backup partition comprises: Starting the device, if the first preset position of the boot communication partition contains the backup partition encrypted data area preset instruction or the factory reset instruction, then guiding the device to enter the recovery mode; In the recovery mode, if the backup partition encrypted data area preset instruction exists in the first preset position of the boot communication partition, the backup partition information is read from the second preset position of the boot communication partition, and the file system capacity of the backup partition is expanded to the actual size of the backup partition according to the backup partition information; Re-erasing and formatting the user data partition, clearing the preset completion mark at the third preset position in the boot communication partition, clearing the backup partition encrypted data area preset instruction at the first preset position in the boot communication partition, exiting the encrypted data preset process and the recovery mode, and restarting the device to perform data preset on the user data partition; If the factory reset instruction exists in the first preset position of the boot communication partition, a factory reset operation is performed, wherein the factory reset operation re-erases and formats the user data partition but does not re-erase and format the backup partition; Read the backup partition information from the second preset position in the boot communication partition, and check whether the backup partition information magic number in the backup partition information is consistent with the preset magic number; If they are inconsistent, clearing the factory reset instruction in the first preset position in the boot communication partition and exiting the factory reset process; and If they are consistent, clear the preset completion mark of the third preset position in the boot communication partition, clear the factory reset instruction of the first preset position in the boot communication partition, exit the factory reset process, and restart the device to preset data for the user data partition. 9. The method according to claim 8, wherein restarting the device to pre-set data for the user data partition comprises: During the system startup process, a preset data encryption and decryption service is used to ensure that the user data area is encrypted according to a preset encryption method. After the encryption is completed, the physical block device corresponding to the user data area is mapped into a virtual block device through the device mapping mechanism of the operating system kernel, and the virtual block device is mounted to a preset mount directory representing the user data partition; Using the encrypted data pre-set service to detect whether the preset mount directory representing the user data partition has mounted the virtual block device; and If the mounting is complete, start the data pre-configuration process to pre-configure data for the user data partition. 10. The method according to claim 9, wherein starting the data presetting process to preset data for the user data partition comprises: Using the encrypted data presetting service to check whether the presetting completion mark exists in the third preset position in the boot communication partition; If it exists, exit the encrypted data provisioning service; If not, checking whether the preset mount directory representing the user data partition has mounted the virtual block device; If the mounting is not completed, after waiting for a preset time, return to execute the encrypted data presetting service to check whether the presetting completion mark exists in the third preset position in the boot communication partition; If the mounting is completed, reading the backup partition information from the second preset position in the boot communication partition, and checking whether the backup partition magic number in the backup partition information is consistent with the preset magic number; If they are inconsistent, the encrypted data pre-setting service will be exited; If they are consistent, the digital digest of the backup body in the backup partition information is calculated according to the digital digest algorithm corresponding to the backup body digital digest algorithm type in the backup partition information, and the calculated backup body digital digest is encrypted using a preset symmetric encryption algorithm and key for the backup partition information to obtain the backup body digital digest ciphertext and the backup body digital digest ciphertext size; If the calculated size of the backup volume digital summary ciphertext is the same as the size of the backup volume digital summary ciphertext in the backup partition information, and the calculated backup volume digital summary ciphertext is the same as the backup volume digital summary ciphertext in the backup partition information, then determine the block device node corresponding to the backup partition according to the name of the backup partition of the backup volume in the backup partition information, and check whether the backup partition has been mounted; If not mounted, then mount the backup partition, and check whether there is a corresponding preset data compression package according to the path of the preset data compression package of the backup body in the backup partition information in the backup partition; If it does not exist, exit the encrypted data provisioning service; If it exists, calculating the digital digest of the preset data compression package in the backup partition according to the digital digest algorithm corresponding to the backup body digital digest algorithm type in the backup partition information; If the calculated digital digest of the preset data compression package is the same as the digital digest of the preset data compression package of the backup body in the backup partition information, then decompressing the preset data compression package in the backup partition to the preset mount directory representing the user data partition, and automatically encrypting the decompressed preset data through the preset data encryption and decryption service and then writing it into the actual user data partition; and A preset completion mark is written in the third preset position in the boot communication partition to complete the data preset of the user data partition and exit the encrypted data preset service. 11. The method according to claim 9, further comprising: When using a service or application of the preset data in the user data area, checking whether there is a preset completion mark at a third preset position in the guided communication partition; If so, continue to use the service or application of the preset data in the user data area; and If not, after waiting for a preset time, the method returns to execute the check whether there is a preset completion mark at the third preset position in the guided communication partition. 12. The method according to claim 8, further comprising: When the factory reset operation is performed, after the factory reset instruction is written into the first preset position in the boot communication partition, the device is restarted. 13. An electronic device, comprising: a memory configured to store an executable program; and A processor configured to execute the program to perform the method according to any one of claims 1 to 12. 14. A computer-readable medium having a computer program stored thereon, wherein the computer program is executed to implement the method according to any one of claims 1 to 12.