CN108089815A - A kind of data screening method and apparatus - Google Patents

A kind of data screening method and apparatus Download PDF

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Publication number
CN108089815A
CN108089815A CN201611043381.7A CN201611043381A CN108089815A CN 108089815 A CN108089815 A CN 108089815A CN 201611043381 A CN201611043381 A CN 201611043381A CN 108089815 A CN108089815 A CN 108089815A
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Prior art keywords
data
user
kernel spacing
memory storage
copy
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CN201611043381.7A
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Chinese (zh)
Inventor
李雪峰
张雁冰
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Alibaba Group Holding Ltd
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Alibaba Group Holding Ltd
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Priority to CN201611043381.7A priority Critical patent/CN108089815A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0638—Organizing or formatting or addressing of data
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
    • G06F3/065—Replication mechanisms

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

This programme embodiment provides a kind of data screening method and apparatus.This method includes：By the first data copy of user's space memory storage to kernel spacing；The second data and first data stored in the kernel spacing are filtered.In this programme embodiment, after by the first data copy of user's space memory storage to kernel spacing, kernel spacing can be obtained by reference type respective value, therefore when the second data and first data stored in kernel spacing are filtered, realize the screening to reference type parameter.

Description

A kind of data screening method and apparatus
【Technical field】
The present invention relates to field of computer technology more particularly to a kind of data screening method and apparatus.
【Background technology】
In the prior art, specifically as shown in Figure 1, when carrying out system calling, the data that system calling uses all can It is pressed into register, and system calling is carried out according to the data being pressed into register, carry out the parameter master of system calling It is divided into：Value Types and reference type are that respective value is pressed directly into register for the parameter of Value Types, for quoting The parameter of type is that corresponding address is pressed into register, and reference type respective value has been stored in user's space, when After carry out system calling, Value Types and reference type in register can be pressed into the stack of kernel spacing, and then empty to kernel Between stack in data screened.
In process of the present invention is realized, inventor has found that at least there are the following problems in the prior art：
When being screened due to the data in the stack to kernel spacing, can only discre value type parameter, and None- identified Reference type parameter, thus when data in the stack to kernel spacing are screened reference type parameter can not be sieved Choosing.
【The content of the invention】
In view of this, this programme embodiment provides a kind of data screening method and apparatus, to solve in the prior art The problem of reference type parameter can not being screened when being screened to the data in stack.
In a first aspect, this programme embodiment provides a kind of data screening method, including：
By the first data copy of user's space memory storage to kernel spacing；
The second data and first data stored in the kernel spacing are filtered.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, first number According to the data including reference type；
Second data include the data of Value Types.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, by user's space First data copy of memory storage to kernel spacing, including：
Specified function is called, by the first data copy of user's space memory storage to kernel spacing.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, the data sieve Choosing method is implemented in kernel memory.
A technical solution in above-mentioned technical proposal has the advantages that：In this programme embodiment, by user For first data copy of space memory storage to after kernel spacing, kernel spacing just obtains the data of user's space memory storage, so as to The second data and the first data of user's space memory storage stored in kernel spacing can be filtered, further, The corresponding value of reference type due to user's space memory storage, the first data copy of user's space memory storage is empty to kernel Between after, kernel spacing can be obtained by reference type respective value, therefore the second data for being stored in kernel spacing and described When first data are filtered, the screening to reference type parameter is realized.
Second aspect, this programme embodiment provide a kind of data screening device, including：
Copy cell, for by the first data copy of user's space memory storage to kernel spacing；
Filter element, for being filtered to the second data stored in the kernel spacing and first data.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, first number According to the data including reference type；
Second data include the data of Value Types.
Aspect as described above and any possible realization method, it is further provided a kind of realization method,
When the copy cell is used for the first data copy of user's space memory storage to kernel spacing, including：
Specified function is called, by the first data copy of user's space memory storage to kernel spacing.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, the data sieve Choosing method is implemented in kernel memory.
A technical solution in above-mentioned technical proposal has the advantages that：In this programme embodiment, copy is single For member by after the first data copy of user's space memory storage to kernel spacing, kernel spacing just obtains the number of user's space memory storage According to, filter element so as to the second data stored in kernel spacing and the first data of user's space memory storage into Row filtering, further, the reference type corresponding value due to user's space memory storage, by the first of user's space memory storage For data copy to after kernel spacing, kernel spacing can be obtained by reference type respective value, therefore be stored in kernel spacing The second data and first data when being filtered, realize the screening to reference type parameter.
The third aspect, this programme embodiment provide a kind of non-volatile computer readable storage medium storing program for executing for storing program, The program makes data screening device perform data screening method, the described method comprises the following steps：
By the first data copy of user's space memory storage to kernel spacing；
The second data and first data stored in the kernel spacing are filtered.
A technical solution in above-mentioned technical proposal has the advantages that：In this programme embodiment, copy is single For member by after the first data copy of user's space memory storage to kernel spacing, kernel spacing just obtains the number of user's space memory storage According to, filter element so as to the second data stored in kernel spacing and the first data of user's space memory storage into Row filtering, further, the reference type corresponding value due to user's space memory storage, by the first of user's space memory storage For data copy to after kernel spacing, kernel spacing can be obtained by reference type respective value, therefore be stored in kernel spacing The second data and first data when being filtered, realize the screening to reference type parameter.
【Description of the drawings】
It, below will be to needed in the embodiment attached in order to illustrate more clearly of the technical solution of this programme embodiment Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this field For those of ordinary skill, without having to pay creative labor, it can also be obtained according to these attached drawings other attached Figure.
Fig. 1 is the exemplary plot of data screening in the prior art；
Fig. 2 is a kind of flow diagram for data screening method that this programme embodiment one is provided；
Fig. 3 is a kind of schematic diagram for data screening that this programme embodiment three is provided；
Fig. 4 is the schematic diagram for another data screening that this programme embodiment three is provided；
Fig. 5 is a kind of structure diagram for data screening device that this programme example IV is provided；
Fig. 6 is a kind of simplified block diagram of the server 100 proposed in this programme embodiment five.
【Specific embodiment】
For a better understanding of the technical solution of the present invention, this programme embodiment is retouched in detail below in conjunction with the accompanying drawings It states.
It will be appreciated that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Base Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its Its embodiment, belongs to the scope of protection of the invention.
The term used in this programme embodiment is only merely for the purpose of description specific embodiment, and is not intended to be limiting The present invention.In this programme embodiment and " one kind " of singulative used in the attached claims, " described " and "the" It is also intended to including most forms, unless context clearly shows that other meanings.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, represent There may be three kinds of relations, for example, A and/or B, can represent：Individualism A, exists simultaneously A and B, individualism B these three Situation.In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.
It will be appreciated that though may data, but these be described using term first, second etc. in this programme embodiment Data should not necessarily be limited by these terms.These terms are only used for data being distinguished from each other out.For example, this programme embodiment is not being departed from In the case of scope, the first data can also be referred to as the second data, and similarly, the second data can also be referred to as the first number According to.
Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ... When " or " in response to determining " or " in response to detection ".Similarly, depending on linguistic context, phrase " if it is determined that " or " if detection (condition or event of statement) " can be construed to " when definite " or " in response to determining " or " when the detection (condition of statement Or event) when " or " in response to detecting (condition or event of statement) ".
Embodiment one
User space refers to the state that cannot carry out power user's ROOT limiting operations, is operation when performing user command Pattern, in this case, the code of execution are limited by hardware, it is not possible to carry out some operations, for example, write data into other into The corresponding memory space of journey carries out system calling etc., wherein, data or the code used are needed when performing User space order It is stored in the first designated space, which is user's space；Kernel state refers to that ROOT limiting operations can be carried out State, be perform operating system command when operational mode, in this case, the code of execution can be with unconfined to system Storage or external equipment access, wherein, when performing kernel state order the data used or code is needed to be stored in second In designated space, which is kernel spacing.The application program of user's space, just can be into after being called by system Enter kernel spacing, after the application program of user's space enters kernel spacing, the corresponding process of application program of user's space needs Corresponding parameter and variable are sent to kernel spacing, and kernel spacing needs preservation user's space to run the application program When the corresponding register address of process.
Due to when being screened to the data in kernel spacing, can only discre value type parameter, and None- identified is quoted Type parameter, for reference type parameter, what is stored in kernel spacing is corresponding address, and what which was directed toward is user's sky Between in corresponding value, which can be identified by kernel spacing, therefore this programme embodiment provides a kind of data screening method, It please refers to Fig.2, by the flow diagram for the method that this programme embodiment provides, as shown in Fig. 2, the data screening method Kernel memory is implemented in, this method comprises the following steps：
201st, by the first data copy of user's space memory storage to kernel spacing.
Wherein, first data include the data of reference type.
Specifically, after system calling is carried out, when the parameter type in the stack for being pressed into kernel spacing is reference type, root According to the corresponding address of reference type in stack, by the data copy of corresponding storage in the user space into kernel spacing, at this point, The corresponding data of reference type are contained in the stack of kernel spacing, further, the corresponding value of reference type has been also forced into interior In the stack of nuclear space, at this point, by the data that are pressed into the stack of kernel spacing it is known that in the stack of press-in kernel spacing Reference type respective value.Certainly, due in kernel spacing the corresponding value of reference type be stored in user's space, carrying out After system is called, the data of the reference type of user's space memory storage, the i.e. corresponding value of reference type can all be copied to Kernel spacing, and being pressed into stack, after all the corresponding value of reference type is copied to kernel spacing, according to being pressed into stack The address of the value of reference type, the address of the corresponding reference type to being stored in the stack is modified, after according to modification Address search to corresponding reference type value.
202nd, the second data and first data that are stored in the kernel spacing are filtered.
Wherein, second data include the data of Value Types.
Specifically, when the Value Types and reference type stored in kernel spacing are filtered, due to by referenced classes The corresponding value of type is copied to from user's space in kernel spacing, therefore, it is known that reference type corresponds in kernel spacing Value, further, the parameter being filtered at this time in kernel spacing is Value Types, and then can be to being stored in kernel spacing The second data and copy the first data of kernel spacing to from user's space and be filtered.
It when being filtered to the first data and the second data, is filtered according to pre-set filtering policy, when When one data and/or the second data meet filtering policy, then system calling logic is continued to execute, when the first data and/or second When data meet filtering policy, then implementing result is returned to, wherein, filter operation carries out in pre-set sandbox.
In this programme embodiment, after the first data copy of user's space memory storage to kernel spacing, kernel spacing The data of user's space memory storage are just obtained, so as to in the second data and user's space that are stored in kernel spacing First data of storage are filtered, further, the reference type corresponding value due to user's space memory storage, by user For first data copy of space memory storage to after kernel spacing, kernel spacing can be obtained by reference type respective value, therefore When being filtered to the second data stored in kernel spacing and first data, the sieve to reference type parameter is realized Choosing.
Embodiment two
Since the data in user's space are sightless for kernel spacing, i.e., kernel spacing can not by address The data stored in user's space are found, therefore a kind of specific implementation for step 201 is provided in this programme embodiment Mode, the realization method are specially：
Specified function is called, by the first data copy of user's space memory storage to kernel spacing.
Specifically, the specified function has the function of the first data copy of user's space memory storage to kernel spacing, When needing the first data copy of user's space memory storage to kernel spacing, the specified function is called, according to kernel spacing The address of first data of memory storage by the first data copy of user's space memory storage to kernel spacing, is implemented in this programme In example, which is denoted as copy_from_user functions.
Further, when needing to copy the value of the reference type of user's space memory storage to kernel spacing, call Copy_from_user functions according to the address of the reference type of kernel spacing memory storage, are worth corresponding from user's space Copy kernel spacing to.
Embodiment three
In order to which the technological thought of this programme is expanded on further, in conjunction with specific application scenarios, to the technical side of this programme Case illustrates, specifically, under cloud computing scene, a cloud computing server can provide service for multiple users, still Only user is allowed to open the All Files under own path, without allowing to open the file under other paths, want to beat in user It when opening file under own path or the file under other paths, is all realized by reference type parameter, specifically such as Fig. 3 institutes Show, after the order for the reference type parameter for opening file is sent in cloud computing server by user, this method includes following Step：
1st, the value of reference type parameter is pressed by cloud computing server by the address press-in register of reference type parameter User's space memory storage.
Wherein, which is directed toward the value of user's space memory storage.
It 2nd, will be in the stack of the address press-in kernel spacing in register when cloud computing server carries out system calling.
3rd, cloud computing server is copied the value to from user's space by copy_from_user functions according to the address In register, and the value is pressed into stack.
4th, the value in stack is filtered.
Wherein, if the value indicate that opening the file under user's A own paths, then corresponding file is opened, if the value It represents to open the file under other users path, then returns to the prompt message that can not be opened.
After cloud computing server, which receives 3 users, opens the order of file, wherein, the parameter type of the order is to draw It is specific as shown in figure 4, this method is further comprising the steps of with type parameter：
1st, the value of reference type parameter is pressed by cloud computing server by the address press-in register of reference type parameter User's space memory storage.
Wherein, it is directed toward the value of the correspondence reference type parameter of user's space memory storage in the address stored in register.
It 2nd, will be in the stack of the address press-in kernel spacing in register when cloud computing server carries out system calling.
Wherein, it is pressed into when being pressed into stack according to the sequencing of the reference type received.
3rd, address of the cloud computing server in stack, it is by copy_from_user functions that corresponding value is empty from user Between copy in register, and will it is corresponding value press-in stack in.
4th, the value in stack is filtered.
Wherein, if some value represents to open the file under the user's own path, corresponding file is opened, if should Value represents the file under opening other users path, then returns to the prompt message that can not be opened.
Example IV
This programme embodiment provides a kind of data screening device, as shown in figure 5, the device can be used for realizing foregoing implementation The each method flow of example one and embodiment two, described device include：
Copy cell 51, for by the first data copy of user's space memory storage to kernel spacing；
Filter element 52, for being filtered to the second data stored in the kernel spacing and first data.
First data include the data of reference type；
Second data include the data of Value Types.
When the copy cell 51 is used for the first data copy of user's space memory storage to kernel spacing, including：
Specified function is called, by the first data copy of user's space memory storage to kernel spacing.
The data screening method is implemented in kernel memory.
In this programme embodiment, copy cell by after the first data copy of user's space memory storage to kernel spacing, Kernel spacing just obtains the data of user's space memory storage, and filter element is so as to the stored in kernel spacing second number According to and the first data of user's space memory storage be filtered, further, the reference type due to user's space memory storage Corresponding value, after by the first data copy of user's space memory storage to kernel spacing, kernel spacing can be obtained by reference Type respective value, therefore when the second data and first data stored in kernel spacing are filtered, realizes pair The screening of reference type parameter.
Embodiment five
Fig. 6 is the simplified block diagram of server 100.The server 100 can include and one or more data storage facilities The processor 101 of connection, the data storage facility can include storage medium 102 and internal storage location 103.Server 100 may be used also To include input interface 104 and output interface 105, for communicating with another device or system.By the CPU of processor 101 The program code of execution is storable in internal storage location 103 or storage medium 102.
Processor 101 in server 100 calls the program code for being stored in internal storage location 103 or storage medium 102, with Perform following each step：
By the first data copy of user's space memory storage to kernel spacing；
The second data and first data stored in the kernel spacing are filtered.
In an optional implementation, first data include the data of reference type；Second data packet Include the data of Value Types.
In an optional implementation, the processor 101 is additionally operable to call specified function, by user's space memory First data copy of storage is to kernel spacing.
In an optional implementation, the data screening method is implemented in kernel memory.
In above-described embodiment five, storage medium can be read-only memory (Read-Only Memory, ROM) or can Read-write, such as hard disk, flash memory.Internal storage location can be random access memory (Random Access Memory, RAM).It is interior Memory cell can be with processor physical integration or integrated in memory or being configured to individual unit.
Processor is the control centre of above-mentioned server, and provides processing unit, for executing instruction, carries out interruption behaviour Make, clocking capability and various other functions are provided.Optionally, processor includes one or more central processing unit (CPU), Such as CPU 0 shown in Fig. 6 and CPU 1.Above equipment includes one or more processor.Processor can be monokaryon (single CPU) processor or multinuclear (multi -CPU) processor.Unless otherwise stated, it is described as performing such as processor of task Or the component of memory can be realized as universal component, be temporarily used for performing task in given time or be embodied as being specifically manufactured For performing the particular elements of the task.Terminology used herein " processor " refers to one or more devices, circuit and/or processing Core, for handling data, such as computer program instructions.
It is storable in by the CPU of the processor program codes performed in internal storage location or storage medium.Optionally, it is stored in Program code in storage medium can be copied into internal storage location and be performed so as to the CPU of processor.Processor can perform at least One kernel (such as LINUXTM、UNIXTM、WINDOWSTM、ANDROIDTM、IOSTM), it is well known that the kernel is used to pass through control Execution, control and the communication of peripheral unit and the use of control computer device resource of other programs or process are made to control The operation of above equipment.
Said elements in above equipment can be connected to each other by bus, bus such as data/address bus, address bus, control One of bus, expansion bus and local bus or its any combination.
Embodiment six
This programme embodiment additionally provides a kind of non-volatile computer readable storage medium storing program for executing for storing program, which makes Data screening device performs data screening method, the described method comprises the following steps：
By the first data copy of user's space memory storage to kernel spacing；
The second data and first data stored in the kernel spacing are filtered.
In the several embodiments provided in this programme, it should be understood that disclosed apparatus and method can pass through it Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only Only a kind of division of logic function, can there is other dividing mode in actual implementation, for example, multiple units or component can be tied It closes or is desirably integrated into another system or some features can be ignored or does not perform.It is another, it is shown or discussed Mutual coupling, direct-coupling or communication connection can be the INDIRECT COUPLING or logical by some interfaces, device or unit Letter connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit The component shown may or may not be physical location, you can be located at a place or can also be distributed to multiple In network element.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs 's.
In addition, each functional unit in each embodiment of this programme can be integrated in a processing unit, it can also That unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list The form that hardware had both may be employed in member is realized, can also be realized in the form of hardware adds SFU software functional unit.
The foregoing is merely the preferred embodiment of this programme, not limiting this programme, all essences in this programme God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of this programme protection.

Claims (9)

  1. A kind of 1. data screening method, which is characterized in that the described method includes：
    By the first data copy of user's space memory storage to kernel spacing；
    The second data and first data stored in the kernel spacing are filtered.
  2. 2. according to the method described in claim 1, it is characterized in that,
    First data include the data of reference type；
    Second data include the data of Value Types.
  3. 3. according to the method described in claim 1, it is characterized in that, by the first data copy of user's space memory storage to kernel Space, including：
    Specified function is called, by the first data copy of user's space memory storage to kernel spacing.
  4. 4. according to the method described in claim 1, it is characterized in that, the data screening method is implemented in kernel memory.
  5. 5. a kind of data screening device, which is characterized in that described device includes：
    Copy cell, for by the first data copy of user's space memory storage to kernel spacing；
    Filter element, for being filtered to the second data stored in the kernel spacing and first data.
  6. 6. device according to claim 5, which is characterized in that
    First data include the data of reference type；
    Second data include the data of Value Types.
  7. 7. device according to claim 5, which is characterized in that the copy cell is used for the of user's space memory storage When one data copy is to kernel spacing, including：
    Specified function is called, by the first data copy of user's space memory storage to kernel spacing.
  8. 8. device according to claim 5, which is characterized in that the data screening method is implemented in kernel memory.
  9. 9. a kind of non-volatile computer readable storage medium storing program for executing for storing program, which makes data screening device perform data sieve Choosing method the described method comprises the following steps：
    By the first data copy of user's space memory storage to kernel spacing；
    The second data and first data stored in the kernel spacing are filtered.
CN201611043381.7A 2016-11-23 2016-11-23 A kind of data screening method and apparatus Pending CN108089815A (en)

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