CN105700851B - A kind of method and apparatus realized pop down and play stack - Google Patents
A kind of method and apparatus realized pop down and play stack Download PDFInfo
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- CN105700851B CN105700851B CN201610012520.3A CN201610012520A CN105700851B CN 105700851 B CN105700851 B CN 105700851B CN 201610012520 A CN201610012520 A CN 201610012520A CN 105700851 B CN105700851 B CN 105700851B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
- G06F9/30003—Arrangements for executing specific machine instructions
- G06F9/3004—Arrangements for executing specific machine instructions to perform operations on memory
- G06F9/30043—LOAD or STORE instructions; Clear instruction
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
- G06F9/30098—Register arrangements
- G06F9/3012—Organisation of register space, e.g. banked or distributed register file
- G06F9/30134—Register stacks; shift registers
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Abstract
The invention discloses it is a kind of realize pop down and play stack method and apparatus, including：When receiving pop down instruction push Reference, the first object reference in push Reference is instructed to calculate the first check value according to pop down, the first check value and the first object reference are merged, the data after merging are sequentially written in stack；When receiving bullet stack instruction pop Reference, data are read from stack according to principle first-in last-out, obtain the second check value and the second object reference in the data read, 3rd check value is calculated according to the second object reference of acquisition, judge that the 3rd check value being calculated is identical with the second check value obtained, return to the second object reference of acquisition.Pass through the solution of the present invention, when receiving bullet stack instruction pop Reference, by comparing the second check value and the 3rd check value, the second object reference is just returned in the second check value and identical the 3rd check value, so as to which attacker can not be operated using push short or push int come the content to the corresponding object of object reference, security is improved.
Description
Technical field
The present invention relates to stacking, espespecially a kind of method and apparatus realized pop down and play stack.
Background technology
Storehouse is a kind of data structure by data arranged in sequence, is mainly used for storing the parameter value of function or local change
Value of amount etc..Data store data by push operation, read data by playing stack operation, ensure the former first-in last-out of data
Then.
The existing method realized pop down and play stack generally comprises：It, will when receiving pop down instruction push Reference
Object reference in pop down instruction push Reference is sequentially written in stack, is received and is played stack instruction pop Reference
When, according to principle first-in last-out, reading object is quoted from stack.
It, will be in pop down instruction push short when receiving pop down instruction push short (or pop down instruction push int)
Data be sequentially written in stack, receive when playing stack instruction pop short (or playing stack instruction pop int), after advanced
The principle gone out reads data from stack.
Push short and pop short are generally employed in pairs, and push Reference and pop Reference are general
It uses in pairs, exist in JAVA virtual machine _ orders such as bspush, _ sspush can directly invoke by simply handling
Push short carry out pop down, and push Reference and pop Reference are built-in command, are generally carried out in system
It is used during object transmission or Object Creation etc. by internal system.
In the existing method realized pop down and play stack, since push short and push Reference are carrying out pop down
Identical with the process for playing stack, therefore, attacker is often pressed into some using push short instead of push Reference
Object reference so as to be operated to the content of the corresponding object of object reference, be easy to cause the leakage of system data, security
It is relatively low.
The content of the invention
To solve the above-mentioned problems, the present invention proposes a kind of method and apparatus realized pop down and play stack, can improve
Security.
In order to achieve the above object, the present invention proposes a kind of method realized pop down and play stack, including：
When receiving pop down instruction push Reference, the first object in push Reference is instructed according to pop down
It quotes and calculates the first check value, the first check value and the first object reference are merged, the data after merging are sequentially write
Into stack；
When receiving bullet stack instruction pop Reference, data are read from stack according to principle first-in last-out, obtains and reads
The second check value and the second object reference in the data taken calculate the 3rd check value according to the second object reference of acquisition, sentence
Breaking, it is identical with the second check value obtained the 3rd check value being calculated, and returns to the second object reference of acquisition.
Preferably, when judging that the 3rd check value and second check value differ, this method further includes：It throws
Go out exception.
Preferably, when receiving pop down instruction push short or push int, this method further includes：
Data in the pop down received instruction push short or push int are sequentially written in the stack.
Preferably, it is described that the first object reference in push Reference is instructed to calculate the first check value bag according to pop down
It includes：
First object reference progress step-by-step is negated to obtain first check value；
It is described to be included according to the second object reference of acquisition the 3rd check value of calculating：
Second object reference progress step-by-step is negated to obtain the 3rd check value.
Preferably, it is described that the first object reference in push Reference is instructed to calculate the first check value bag according to pop down
It includes：
The first object reference step-by-step and preset value are subjected to predetermined registration operation and obtain first check value；
It is described to be included according to the second object reference of acquisition the 3rd check value of calculating：
The second object reference step-by-step and preset value are subjected to predetermined registration operation and obtain the 3rd check value.
Preferably,
It is described first check value and the first object reference are merged including：First check value is placed in described
Before or after an object is quoted；
Second check value obtained in the data read and the second object reference include：
Obtain the data of the reading preceding M obtain second check value, obtain rear N of the data of the reading
Obtain second object reference；Alternatively,
Obtain the data of the reading rear M obtain second check value, obtain the top N of the data of the reading
Obtain second object reference；
Wherein, M is the digit of second check value, and N is the digit of second object reference.
The invention also provides a kind of devices realized pop down and play stack, include at least：
When instructing push Reference for receiving pop down, pop down instruction is sent to processing module for receiving module
push Reference；When receiving bullet stack instruction pop Reference, send a notification message to processing module；
For receiving pop down instruction push Reference, push Reference are instructed according to pop down for processing module
In the first object reference calculate the first check value, the first check value and the first object reference are merged, after merging
Data are sequentially written in stack；Notification message is received, data are read from stack according to principle first-in last-out, obtain reading
The second check value and the second object reference in data calculate the 3rd check value according to the second object reference of acquisition, judge
The 3rd check value being calculated is identical with the second check value obtained, returns to the second object reference of acquisition.
Preferably, the processing module is additionally operable to：
Judge that the 3rd check value and second check value differ, throw exception.
Preferably, the receiving module is additionally operable to：
When receiving pop down instruction push short or push int, pop down instruction push is sent to the processing module
Short or push int；
The processing module is additionally operable to：
Receive pop down instruction push short or push int, by the pop down instruct push short or
Data in push int are sequentially written in the stack.
Preferably, the processing module is specifically used for：
The pop down instruction push Reference are received, first object reference progress step-by-step is negated to obtain institute
The first check value is stated, first check value and first object reference are merged, the data after the merging are pressed
Sequence is written in stack；The notification message is received, data are read from the stack according to principle first-in last-out, described in acquisition
Second object reference progress step-by-step is negated to obtain described by the second check value and the second object reference in the data of reading
3rd check value judges that the 3rd check value being calculated is identical with the second check value obtained, returns to the second couple of acquisition
As quoting.
Preferably, the processing module is specifically used for：
The pop down instruction push Reference are received, the first object reference step-by-step and preset value are carried out pre-
If operation obtains first check value, first check value and first object reference are merged, by the conjunction
Data after and are sequentially written in stack；The notification message is received, is read according to principle first-in last-out from the stack
Data obtain the second check value and the second object reference in the data of the reading, by the second object reference step-by-step with
Preset value carries out predetermined registration operation and obtains the 3rd check value, judges the 3rd check value being calculated and the second school obtained
It tests that value is identical, returns to the second object reference of acquisition.
Preferably, the processing module is specifically used for：
The pop down instruction push Reference are received, are instructed according to the pop down in push Reference
First object reference calculates first check value, by first check value be placed in before first object reference or it
Afterwards, the data after the merging are sequentially written in stack；The notification message is received, according to principle first-in last-out from institute
It states and data is read in stack；
Obtain the data of the reading preceding M obtain second check value, obtain rear N of the data of the reading
Obtain second object reference；Alternatively, rear M that obtain the data of the reading obtain second check value, institute is obtained
The top N for stating the data of reading obtains second object reference；Wherein, M is the digit of second check value, and N is described
The digit of second object reference；
3rd check value is calculated according to the second object reference of acquisition, judges the 3rd check value being calculated and acquisition
The second check value it is identical, return to the second object reference of acquisition.
Compared with prior art, technical scheme includes：When receiving pop down instruction push Reference, root
The first check value is calculated according to the first object reference in pop down instruction push Reference, to the first check value and the first object
Reference merges, and the data after merging are sequentially written in stack；When receiving bullet stack instruction pop Reference, according to
Principle first-in last-out reads data from stack, obtains the second check value and the second object reference in the data of reading, according to
The second object reference obtained calculates the 3rd check value, judges the 3rd check value being calculated and the second check value obtained
It is identical, return to the second object reference of acquisition.By the solution of the present invention, when receiving pop down instruction push Reference,
It writes in storehouse after first check value and the first object reference are merged, when receiving bullet stack instruction pop Reference, passes through
Compare the second check value and the 3rd check value, the second object reference just returned in the second check value and identical the 3rd check value,
So as to attacker can not using pop down instruct push short or push int come the content to the corresponding object of object reference into
Row operation, improves security.
Description of the drawings
The attached drawing in the embodiment of the present invention is illustrated below, the attached drawing in embodiment be for the present invention into one
Step understands, for explaining the present invention together with specification, does not form limiting the scope of the invention.
Fig. 1 is that the present invention realizes pop down and plays the method flow diagram of stack；
Fig. 2 is that the present invention realizes pop down and plays the structure composition schematic diagram of the device of stack.
Specific embodiment
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings, not
It can be used for limiting the scope of the invention.It should be noted that in the case where there is no conflict, embodiment and reality in the application
The various modes applied in example can be mutually combined.
Referring to Fig. 1, the present invention proposes a kind of method realized pop down and play stack, including：
Step 100 when receiving pop down instruction push Reference, is instructed according to pop down in push Reference
First object reference calculates the first check value, the first check value and the first object reference is merged, by the data after merging
Sequentially it is written in stack.
In this step, the first object reference in push Reference is instructed to calculate the first check value bag according to pop down
It includes：
The progress step-by-step of first object reference is negated to obtain the first check value；
Or the first object reference step-by-step and preset value are subjected to predetermined registration operation and obtain the first check value.
Wherein, predetermined registration operation can be with or or or exclusive or etc..
In this step, the first check value and the first object reference are merged including：
First check value is placed in before or after first object reference.
Step 101, receive play stack instruction pop Reference when, number is read from stack according to principle first-in last-out
According to, obtain the second check value and the second object reference in the data of reading, according to the second object reference of acquisition calculate the 3rd
Check value judges that the 3rd check value being calculated is identical with the second check value obtained, and the second object for returning to acquisition draws
With.
In this step, when judging that the 3rd check value and the second check value differ, throw exception.
In this step, calculating the 3rd check value according to the second object reference of acquisition includes：
The progress step-by-step of second object reference is negated to obtain the 3rd check value；
Or the second object reference step-by-step and preset value are subjected to predetermined registration operation and obtain the 3rd check value.
In this step, obtaining the second check value in the data of reading and the second object reference includes：
Obtain the data read preceding M obtain the second check value, and obtain the data of reading rear N obtain the second object
It quotes；Alternatively,
Obtain the data read rear M obtain the second check value, and the top N for obtaining the data of reading obtains the second object
It quotes；Wherein, the digit of the second check value of M positions, N are the digit of the second object reference.
Wherein, M and N may be the same or different.
By the solution of the present invention, when receiving pop down instruction push Reference, by the first check value and first pair
As being write after quoting merging in storehouse, when receiving bullet stack instruction pop Reference, by comparing the second check value and the 3rd
Check value just returns to the second object reference in the second check value and identical the 3rd check value, so as to which attacker can not use pressure
Stack instruction push short or push int operates come the content to the corresponding object of object reference, improves security.
Further, when receiving pop down instruction push short or push int, this method further includes：
Data in pop down instruction push short or push int are sequentially written in stack.
It by the solution of the present invention, receives when playing stack instruction pop Reference, by comparing the second check value and the
Three check values just return to the second object reference in the second check value and identical the 3rd check value, so as to which attacker can not use
Pop down instruction push short or push int carrys out the content that reading object quotes corresponding object, improves security.
Referring to Fig. 2, the invention also provides a kind of devices realized pop down and play stack, include at least：
When instructing push Reference for receiving pop down, pop down instruction is sent to processing module for receiving module
push Reference；When receiving bullet stack instruction pop Reference, send a notification message to processing module；
For receiving pop down instruction push Reference, push Reference are instructed according to pop down for processing module
In the first object reference calculate the first check value, the first check value and the first object reference are merged, after merging
Data are sequentially written in stack；Notification message is received, data are read from stack according to principle first-in last-out, obtain reading
The second check value and the second object reference in data calculate the 3rd check value according to the second object reference of acquisition, judge
The 3rd check value being calculated is identical with the second check value obtained, returns to the second object reference of acquisition.
In the device of the invention, processing module is additionally operable to：
Judge that the 3rd check value and the second check value differ, throw exception.
In the device of the invention, receiving module is additionally operable to：
When receiving pop down instruction push short or push int, pop down instruction push is sent to processing module
Short or push int；
Processing module is additionally operable to：
Pop down instruction push short or push int are received, it will be in pop down instruction push short or push int
Data be sequentially written in stack.
In the device of the invention, processing module is specifically used for：
Pop down instruction push Reference are received, the progress step-by-step of the first object reference is negated to obtain the first verification
Value, merges the first check value and the first object reference, the data after merging is sequentially written in stack；Receive notice
Message reads data according to principle first-in last-out from stack, obtains the second check value and the second object in the data of reading
It quotes, the progress step-by-step of the second object reference is negated to obtain the 3rd check value, the 3rd check value being calculated is judged and obtains
The second check value obtained is identical, returns to the second object reference of acquisition.
In the device of the invention, processing module is specifically used for：
Pop down instruction push Reference are received, the first object reference step-by-step is carried out predetermined registration operation with preset value obtains
To the first check value, the first check value and the first object reference are merged, the data after merging are sequentially written in stack；
Notification message is received, data are read from stack according to principle first-in last-out, obtains the second check value in the data of reading
With the second object reference, the second object reference step-by-step and preset value are subjected to predetermined registration operation and obtain the 3rd check value, judges to count
The 3rd obtained check value is identical with the second check value obtained, returns to the second object reference of acquisition.
In the device of the invention, processing module is specifically used for：
Pop down instruction push Reference are received, according to pop down the first object in push Reference are instructed to draw
With the first check value is calculated, before or after the first check value is placed in the first object reference, the data after merging are sequentially write
Enter into stack；Notification message is received, data are read from stack according to principle first-in last-out；
Obtain the data read preceding M obtain the second check value, and obtain the data of reading rear N obtain the second object
It quotes；Alternatively, rear M that obtain the data read obtain the second check value, the top N for obtaining the data of reading obtains second pair
As quoting；Wherein, M is the digit of the second check value, and N is the digit of the second object reference；
3rd check value is calculated according to the second object reference of acquisition, judges the 3rd check value being calculated and acquisition
The second check value it is identical, return to the second object reference of acquisition.
It should be noted that embodiment described above be for only for ease of it will be understood by those skilled in the art that, and
It is not used in and limits the scope of the invention, on the premise of the inventive concept of the present invention is not departed from, those skilled in the art couple
Any obvious replacement and improvement that the present invention is made etc. are within protection scope of the present invention.
Claims (8)
- A kind of 1. method realized pop down and play stack, which is characterized in that including：When receiving pop down instruction push Reference, the first object reference in push Reference is instructed according to pop down The first check value is calculated, the first check value and the first object reference are merged, the data after merging are sequentially written to stack In；When receiving bullet stack instruction pop Reference, data are read from stack according to principle first-in last-out, obtain reading The second check value and the second object reference in data calculate the 3rd check value according to the second object reference of acquisition, judge The 3rd check value being calculated is identical with the second check value obtained, returns to the second object reference of acquisition；Wherein, it is described that the first object reference the first check value of calculating in push Reference is instructed to include institute according to pop down The progress step-by-step of the first object reference is stated to negate to obtain first check value；It is described to calculate the according to the second object reference of acquisition Three check values include negating to obtain the 3rd check value by second object reference progress step-by-step；Alternatively,It is described the first object reference in push Reference to be instructed to calculate the first check value according to pop down include described the An object quotes step-by-step and obtains first check value with preset value progress predetermined registration operation；Second object according to acquisition draws With the 3rd check value is calculated the 3rd school is obtained including the second object reference step-by-step and preset value are carried out predetermined registration operation Test value.
- 2. according to the method described in claim 1, judge the 3rd check value and second verification it is characterized in that, working as When value differs, this method further includes：Throw exception.
- 3. method according to claim 1 or 2, which is characterized in that instruct push short or push when receiving pop down During int, this method further includes：Data in the pop down received instruction push short or push int are sequentially written in the stack.
- 4. method according to claim 1 or 2, which is characterized in thatIt is described first check value and the first object reference are merged including：First check value is placed in described first pair Before or after reference；Second check value obtained in the data read and the second object reference include：Obtain the data of the reading preceding M obtain second check value, and obtain the data of the reading rear N obtain Second object reference；Alternatively,Obtain the data of the reading rear M obtain second check value, and the top N for obtaining the data of the reading obtains Second object reference；Wherein, M is the digit of second check value, and N is the digit of second object reference.
- 5. a kind of device realized pop down and play stack, which is characterized in that include at least：When instructing push Reference for receiving pop down, pop down instruction push is sent to processing module for receiving module Reference；When receiving bullet stack instruction pop Reference, send a notification message to processing module；Processing module for receiving pop down instruction push Reference, is instructed according to pop down in push Reference First object reference calculates the first check value, the first check value and the first object reference is merged, by the data after merging Sequentially it is written in stack；Notification message is received, data are read from stack according to principle first-in last-out, obtain the data of reading In the second check value and the second object reference, according to the second object reference of acquisition calculate the 3rd check value, judge to calculate The 3rd obtained check value is identical with the second check value obtained, returns to the second object reference of acquisition；Wherein,The processing module is specifically used for：Pop down instruction push Reference are received, first object reference progress step-by-step is negated to obtain described the One check value merges first check value and first object reference, the data after the merging is sequentially write Enter into stack；The notification message is received, data is read from the stack according to principle first-in last-out, obtains the reading Data in the second check value and the second object reference, by second object reference progress step-by-step negate to obtain the described 3rd Check value judges that the 3rd check value being calculated is identical with the second check value obtained, and the second object for returning to acquisition draws With；Alternatively,The pop down instruction push Reference are received, the first object reference step-by-step and preset value are subjected to default behaviour First check value is obtained, first check value and first object reference are merged, after the merging Data be sequentially written in stack；The notification message is received, data are read from the stack according to principle first-in last-out, The second check value and the second object reference in the data of the reading are obtained, by the second object reference step-by-step and preset value It carries out predetermined registration operation and obtains the 3rd check value, judge the 3rd check value being calculated and the second check value phase obtained Together, the second object reference of acquisition is returned.
- 6. device according to claim 5, which is characterized in that the processing module is additionally operable to：Judge that the 3rd check value and second check value differ, throw exception.
- 7. device according to claim 5 or 6, which is characterized in that the receiving module is additionally operable to：When receiving pop down instruction push short or push int, pop down instruction push is sent to the processing module Short or push int；The processing module is additionally operable to：Pop down instruction push short or the push int are received, by the pop down instruction push short or push int In data be sequentially written in the stack.
- 8. device according to claim 5 or 6, which is characterized in that the processing module is specifically used for：The pop down instruction push Reference are received, the first couple in push Reference is instructed according to the pop down First check value is calculated as quoting, before or after first check value is placed in first object reference, by institute The data after merging are stated sequentially to be written in stack；The notification message is received, according to principle first-in last-out from the stack Read data；Obtain the data of the reading preceding M obtain second check value, and obtain the data of the reading rear N obtain Second object reference；Alternatively, rear M that obtain the data of the reading obtain second check value, the reading is obtained The top N of the data taken obtains second object reference；Wherein, M is the digit of second check value, and N is described second The digit of object reference；3rd check value is calculated according to the second object reference of acquisition, judges the 3rd check value being calculated and obtain the Two check values are identical, return to the second object reference of acquisition.
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| EP0912925A1 (en) * | 1996-07-16 | 1999-05-06 | Advanced Micro Devices, Inc. | A return stack structure and a superscalar microprocessor employing same |
| US5968169A (en) * | 1995-06-07 | 1999-10-19 | Advanced Micro Devices, Inc. | Superscalar microprocessor stack structure for judging validity of predicted subroutine return addresses |
| CN101295266A (en) * | 2008-06-05 | 2008-10-29 | 华为技术有限公司 | Method, device and system for detecting and removing deadlock |
| CN104536810A (en) * | 2014-12-18 | 2015-04-22 | 北京奇虎科技有限公司 | Abnormity detecting method and device based on stacks |
| CN105095304A (en) * | 2014-05-19 | 2015-11-25 | 华为技术有限公司 | Log template generation method and equipment |
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| US5968169A (en) * | 1995-06-07 | 1999-10-19 | Advanced Micro Devices, Inc. | Superscalar microprocessor stack structure for judging validity of predicted subroutine return addresses |
| EP0912925A1 (en) * | 1996-07-16 | 1999-05-06 | Advanced Micro Devices, Inc. | A return stack structure and a superscalar microprocessor employing same |
| CN101295266A (en) * | 2008-06-05 | 2008-10-29 | 华为技术有限公司 | Method, device and system for detecting and removing deadlock |
| CN105095304A (en) * | 2014-05-19 | 2015-11-25 | 华为技术有限公司 | Log template generation method and equipment |
| CN104536810A (en) * | 2014-12-18 | 2015-04-22 | 北京奇虎科技有限公司 | Abnormity detecting method and device based on stacks |
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| CN105700851A (en) | 2016-06-22 |
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