CN104915209A - Method for trace debugging and problem repairing of Linux kernels - Google Patents
Method for trace debugging and problem repairing of Linux kernels Download PDFInfo
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- CN104915209A CN104915209A CN201510330712.4A CN201510330712A CN104915209A CN 104915209 A CN104915209 A CN 104915209A CN 201510330712 A CN201510330712 A CN 201510330712A CN 104915209 A CN104915209 A CN 104915209A
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Abstract
The invention provides a method for trace debugging and problem repairing of Linux kernels, which comprises the following steps: a problem function is repaired, a prefix is added before an original function name of the problem function to be defined to be a repair function, a driving module is created, and is arranged in a system device, a repair function with the prefix which is defined in a module is found out in an initialization function of the driving module, and function addresses of the problem function and the repair function are found out in a kernel symbol table, and an entry instruction of the problem function is repaired, and is executed by jumping to the repair function. Problem function repair codes are compiled and chained to be a Linux driving module, a kernel function which is needed to be repaired in identified in the driving module, a kernel inner function which is identified by the driving module is found out when the driving module is uploaded in a Linux kernel, and then the entry instruction of the kernel inner function is repaired, and jumps to the repair function which is defined by the driving module to execute, thereby being capable of repairing tracing, debugging and repairing problems of the repair function, solving the problem that debugging and repairing are difficult ago, and improving efficiency.
Description
Technical field
The present invention relates to Ethernet Exchanger Technology field, particularly relate to a kind of method of linux kernel trace debug and the problem of reparation.
Background technology
The problem debugging method that current submersible linux relates to kernel mainly recompilates whole kernel or uses KGDB (kernel GNU Debugger) software.Recompilate whole kernel consuming time long, and KGDB software to build environment more numerous and diverse and need kernel support.These two kinds of methods of what is more important need updating apparatus system version, and then restart system ability reparation problem, this is unallowed in some cases, as some client's critical network does not allow suspension.
Existing relate to embedded Linux kernel issue track, debugging and reparation method mainly there is following problem: recompilating whole linux kernel needs burning again, restarts device systems and consuming time long.Use KGDB except building circumstance complication, cannot support to change larger amendment.
Summary of the invention
The technical matters that the present invention need solve overcomes above-mentioned deficiency, provides the method for a kind of linux kernel trace debug with the problem of reparation, comprising:
Amendment problem function, adds prefix, is defined as repair function before problem function original function name;
Create driver module;
Driver module is installed in system equipment;
The repair function with described prefix of inside modules definition is searched inside the initialization function of driver module;
Search problem the function address of function and repair function in Kernel Symbol Table, and the entry instruction of amendment problem function, jumps to repair function and perform.
Further, described prefix is prefix_.
Further, the step of described establishment driver module is specially the described repair function of compiling and is linked as driver module.
Further, described driver module called after linux_kernel.ko.
Further, described method also comprises:
First old instruction is saved in an array before modify instruction;
From described array, recover the instruction before amendment during unloading driver module, recover the call flow of original function.
After adopting technical scheme of the present invention, problem function amendment code compilation is linked into a linux driver module, in driver module, mark needs the kernel function of amendment, when linux kernel loads driver module, find the kernel intrinsic function that described driver module identifies, then the entry instruction of this function is revised, the repair function jumping to our driver module definition performs, so just, can follow the tracks of inside this repair function, debug and repair problem, solve debugging in the past and repair the problem of difficulty, improve efficiency.
Accompanying drawing explanation
Fig. 1 is the method schematic diagram of linux kernel trace debug provided by the invention and the problem of reparation;
Fig. 2 is linux kernel original function call relation schematic diagram provided by the invention;
Fig. 3 is linux kernel function call relation schematic diagram provided by the invention.
Embodiment
Technical scheme of the present invention is understood better in order to make relevant technical staff in the field, below in conjunction with the accompanying drawing of embodiment of the present invention, technical scheme in embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
Below in conjunction with drawings and embodiments, the invention will be further described.
Consult Fig. 1, a kind of linux kernel trace debug provided by the invention and the method for the problem of reparation, comprise the following steps:
Step S100, amendment problem function, adds prefix, is defined as repair function before problem function original function name;
As shown in Figure 2, the function call flow process of linux kernel far away is: function_a → function_b → function_c.Need to repair debugging if now function_b goes wrong, then problem function f unction_b is copied to a new original, revise described problem function f unction_b.After having revised, rename, prefixing before original function name, in the present embodiment, prefix is prefix_, i.e. prefix_function_b, and definition prefix_function_b is repair function.
Step S200, creates driver module;
Concrete, compile above-mentioned repair function prefix_function_b and be linked as driver module, by driver module called after linux_kernel.ko.
Step S300, is installed to driver module in system equipment;
The linux_kernel.ko that step S200 generates is installed in system equipment.
Step S400, searches the repair function with described prefix of inside modules definition inside the initialization function of driver module;
Search inside the initialization function of linux_kernel.ko driver module inside definition, the function of the prefix of name band in steps in S100, in the present embodiment, find prefix_function_b, just can think that prefix_function_b is used to repair function function_b by prefix " prefix_ ".
Step S500, the function address of search problem in Kernel Symbol Table function and repair function, the entry instruction of amendment problem function, jumps to repair function and performs.
As shown in Figure 3, after driver module is installed, find the position of function_b according to prefix_function_b during initialization, originally function_a is called function_b be revised as and call prefix_function_b, jump to function_c after prefix_function_b executes to perform, such function call flow process is just become from original function_a → function_b → function_c: function_a → prefix_function_b → function_c.
In a preferred embodiment, described linux kernel trace debug also comprises with the method for the problem of reparation:
First old instruction is saved in an array before modify instruction;
From described array, recover the instruction before amendment during unloading driver module, recover the call flow of original function.
In debug process, if pinpointing the problems is not appear at problem function, and need to recover original function calling relationship, then first old instruction being saved in an array before modify instruction is a measure insured very much.
After adopting technical scheme of the present invention, problem function amendment code compilation is linked into a linux driver module, in driver module, mark needs the kernel function of amendment, when linux kernel loads driver module, find the kernel intrinsic function that described driver module identifies, then the entry instruction of this function is revised, the repair function jumping to our driver module definition performs, so just, can follow the tracks of inside this repair function, debug and repair problem, solve debugging in the past and repair the problem of difficulty, improve efficiency.
Below only have expressed several embodiment of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (5)
1. linux kernel trace debug and a method for the problem of reparation, is characterized in that, comprising:
Amendment problem function, adds prefix, is defined as repair function before problem function original function name;
Create driver module;
Driver module is installed in system equipment;
The repair function with described prefix of inside modules definition is searched inside the initialization function of driver module;
Search problem the function address of function and repair function in Kernel Symbol Table, and the entry instruction of amendment problem function, jumps to repair function and perform.
2. the method for linux kernel trace debug according to claim 1 and the problem of reparation, it is characterized in that, described prefix is prefix_.
3. the method for linux kernel trace debug according to claim 1 and the problem of reparation, the step of described establishment driver module is specially the described repair function of compiling and is linked as driver module.
4. linux kernel trace debug according to claim 3 and the method for the problem of reparation, is characterized in that, described driver module called after linux_kernel.ko.
5. the method for linux kernel trace debug according to claim 1 and the problem of reparation, it is characterized in that, described method also comprises:
First old instruction is saved in an array before modify instruction;
From described array, recover the instruction before amendment during unloading driver module, recover the call flow of original function.
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| CN201510330712.4A CN104915209A (en) | 2015-06-15 | 2015-06-15 | Method for trace debugging and problem repairing of Linux kernels |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105204998A (en) * | 2015-09-30 | 2015-12-30 | 上海斐讯数据通信技术有限公司 | Debugging method and device for mobile terminal kernel symbol table |
| CN105550575A (en) * | 2015-12-03 | 2016-05-04 | 北京神州绿盟信息安全科技股份有限公司 | Method and device for obtaining un-exported function address and data structure offset |
| CN106055979A (en) * | 2016-05-24 | 2016-10-26 | 百度在线网络技术（北京）有限公司 | Kernel fixing method and apparatus |
| CN106203072A (en) * | 2016-06-30 | 2016-12-07 | 北京金山安全软件有限公司 | Method and device for repairing driver and electronic equipment |
| CN108415840A (en) * | 2018-03-14 | 2018-08-17 | 百度在线网络技术（北京）有限公司 | The method, apparatus and server of repair function defect |
| CN111881455A (en) * | 2020-07-27 | 2020-11-03 | 绿盟科技集团股份有限公司 | Firmware security analysis method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105204998A (en) * | 2015-09-30 | 2015-12-30 | 上海斐讯数据通信技术有限公司 | Debugging method and device for mobile terminal kernel symbol table |
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| CN105550575B (en) * | 2015-12-03 | 2018-10-02 | 北京神州绿盟信息安全科技股份有限公司 | A kind of acquisition methods and device of not derived function address and data structural deflection |
| CN106055979A (en) * | 2016-05-24 | 2016-10-26 | 百度在线网络技术（北京）有限公司 | Kernel fixing method and apparatus |
| CN110110522A (en) * | 2016-05-24 | 2019-08-09 | 百度在线网络技术（北京）有限公司 | Kernel restorative procedure and device |
| CN110110522B (en) * | 2016-05-24 | 2021-05-07 | 百度在线网络技术（北京）有限公司 | Kernel repairing method and device |
| CN106203072A (en) * | 2016-06-30 | 2016-12-07 | 北京金山安全软件有限公司 | Method and device for repairing driver and electronic equipment |
| CN106203072B (en) * | 2016-06-30 | 2019-05-03 | 珠海豹趣科技有限公司 | A kind of method, apparatus and electronic equipment for repairing driver |
| CN108415840A (en) * | 2018-03-14 | 2018-08-17 | 百度在线网络技术（北京）有限公司 | The method, apparatus and server of repair function defect |
| CN111881455A (en) * | 2020-07-27 | 2020-11-03 | 绿盟科技集团股份有限公司 | Firmware security analysis method and device |
| CN111881455B (en) * | 2020-07-27 | 2023-12-01 | 绿盟科技集团股份有限公司 | Firmware security analysis method and device |
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Application publication date: 20150916 |