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Talking about how to fix the DUMP of the shelled ELF File In the previous article (http://www.bkjia.com/Article/201505/402725.html), I have introduced how to debug the shelled ELF, which is not described here, directly entering the subject, taking a reinforcement as an example, how to DUMP and fix the shelled ELF so that it can debug and load. Shelling

Article Title: parsing the webshell of the Elf File DT_RPATH in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. I. Preface Some time ago, when I reviewed the elf File knowledge, I flipped through many excellent articles in the past and saw the alert7 hero in the u

ELF file format Analysis Basic Knowledge:1.ELFthree types of files:L Can reposition:Compiler and Assembler creationNeeds to be handled by the linker before it can runL ExecutableAll relocation work and symbolic parsing completedIn addition to the shared library symbols that are parsed at run timeL Shared LibrarySymbolic information required by the linkerCode that can be executed directly at run time2.ELFtwo points of view of a file:3. The target file

Coff Coff-common object file format is a popular object file format, to match the target file generated by the compiler (*. O /*. OBJ), because this format is not only used for the target file, but also for library files and executable files ). Do you often use VC? It generates the target file (*. OBJ) in this format. Other compilers, such as GCC (GNU Compiler Collection), ICL (Intel C/C ++ compiler), and vectorc, also use the target file in this format. Not only C/C ++, but many other languag

Release date:Updated on: 2013-06-10 Affected Systems:Xenproject XenDescription:--------------------------------------------------------------------------------Bugtraq id: 60422Xen is an open-source Virtual Machine monitor developed by the University of Cambridge. Xen's ELF parser has multiple integer overflow, indirect pointer reference, and other vulnerabilities. If a malicious PV domain administrator can specify his or her own kernel, it can escal

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11:40:52 | category: Linux | font size subscription Operating system version Linux bogon 2.6.32-220. el6.x86 _ 64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux 64-bit Linux operating system, unable to run 32-bit applications/Lib/ld-linux.so.2: bad elf Interpreter: no such file or directory solution, you need to install the 32bit glibc Library # Yum install glibc *. i686# Locate/lib/ld-linux.so.2 The following statement checks i

Prompt libc when installing a program. so.6 is too old, but check libc. so is the latest version, so try to use the soft link ln-S/usr/lib64/libc. so/usr/lib64/libc. so.6. The tragedy happened! Almost all Linux commands depend on libc. So. libc. so.6 is a dynamic link library file and a shared function library of gnu c library. Soft links to different versions can work. Google once found that many people entered the Linux rescue emergency mode to replace and copy files. Okay, so did my brother

Make a slight change to the front add.c,#include int add_count = 0;extern int sum_count;extern void Print_log (const char *ident, int line);int add (int num1, int num2){int result= 0;result = Num1 + num2;Add_count + +;return result;}int sum (int num1, int num2, int num3){sum_count++;int sum = Add (NUM1, num2);Return Add (sum, num3);}Compiled into so. View the ELF program header.Like an executable file, only the virtaddr start address of load is 0x0. I

ClipElf HeaderAndSection header tableAre all sections. A typical elf relocated target file contains the following sections: . Text: The machine code of the compiled program. . Rodata: Read-only data, such as the format string in the printf statement and the jump table of the switch statement. . Data: Initialized global C variable. Local C variables are stored in the stack at runtime, neither in. Data nor in. BSS. . BSS: Uninitialized global C var

For executable programs in ELF format on Linux, ld is loaded during the program startup phase. so this dynamic library (What's amazing is that it can also be directly executed, dynamic library/executable program in one ?), And use it to load other required dynamic libraries. The ld. so manual page describes the sequence of searching for dynamic databases in the running phase: Ld. so loads the shared libraries needed by a program, prepares the program

The libdtl. A generated in the original compilation is copied to/usr/lib and set the soft connection. xia@ubuntu:~/dtl37/lib$ ln -s libDTL.a libDTL.so Actually, you can copy. A directly on this hard link. However, manual modification to the system folders such as/usr/lib and/lib is always not harmonious, so even though we have done it before, we have to go back and try again. Then delete the. A file in/lib and try to add the library file search path. Xia @ Ubuntu :~ $ Gedit. bashrc Then add th

ELF Format note (9) -- st_value and st_shndx members of the Elf32_Sym structure, elf32_symst_value Ilocker: Follow Android Security (novice) QQ: 2597294287 The structure of Elf32_Sym is mentioned in the previous note. In this note, write the st_value and st_shndx members. For different types of object files, the meaning of st_value is slightly different: · For the relocatable (. o) file, if the corresponding st_shndx value is SHN_COMMON, st_value stor

; 0x2a0017cc: ldr. w r4, [pc, #2600]; 0x2a0021f8 0x2a0017d0: ldr. w r3, [pc, #2600]; 0x2a0021fc 0x2a0017d4: add r4, pc 0x2a0017d6: mov r6, r0 (Gdb) 0x2a0017d0 in ?? () 1: x/4i $ pc => 0x2a0017d0: ldr. w r3, [pc, #2600]; 0x2a0021fc 0x2a0017d4: add r4, pc 0x2a0017d6: mov r6, r0 0x2a0017d8: ldr r0, [r4, r3] (Gdb) .... Note: ELF executable file entry, __libc_init. The 3rd paramete

ELF Format notes (7) -- symbol table, elfformat The most is the gentle bow, like a lotus flower is cool and cool shame, a sound of treasure, a sound of treasure, the sound of treasure with a sweet sorrow-Xu Zhimo The symbol table contains the definition or reference information of the symbol. For the android so file, the. dynsym symbol table stores the Import and Export symbols of the library file. Read the. dynsym dynamic symbol table of android libl

ELF Format note (11) -- program header structure, elfformat Ilocker: Follow Android Security (novice) QQ: 2597294287 The program header table is a struct array. Each struct element in the array is a program header, and each program header describes a segment ). A so usually has two LOAD segments. android linker loads the so segment according to the maximum virtual address in the memory minus the minimum virtual address, to calculate the memory size t

note is equipped with dual LED light-up lights, allowing the user to take good photos in a low-light environment.From the shooting proofs, le lemon K3 Note shooting effect is the mainstream level, in addition to the color of a single shot in the case of strong color, most of the shooting effect will have color span of the performance of the big. But as a product of the thousand-dollar machine, K3 note in this regard can not be compared with most of the mainstream flagship products are also reas

Ilocker: Focus on Android Security (novice) qq:2597294287Symbolic hash table is used to support the access of symbol tables, which can improve the speed of symbol search.The following table is used to interpret the organization of the Hashtable, but the format is not part of the ELF specification.The index of the signed table is saved in both the bucket and chain arrays, and the array sizes are nbucket and Nchain, respectively.First look at the hash f

The string table contains several null-terminated strings, which are usually the names of the symbol or section. When the other parts of the ELF file need to reference a string, simply provide the position index of the string in the string table.The string table is first an empty string that represents an empty name, so the first byte of the string table is "X".A string table with a length of 25 bytes is shown:Examples of string references:You can ref