elf

来源： https://stackoverflow.com/questions/48968827/tracking-origin-of-symbols-in-shared-libraries

来源： https://stackoverflow.com/questions/63642665/in-some-cases-the-linker-allows-multiple-modules-to-define-global-symbols-with-t

来源： https://stackoverflow.com/questions/62884945/shared-library-symbol-conflicts-and-static-linking-on-linux

问题 I have build a static library with the Android ndk. I now try to use this library in another Android project //in mainActivity static { System.loadLibrary("MILlib"); } I got the following error when building the test project 02 17:07:24.890 2785-2785/com.MIL.testlib E/AndroidRuntime: FATAL EXCEPTION: main Process: com.MIL.testlib, PID: 2785 java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/com.MIL.testlib-1/lib/arm/libMILlib.so" has bad ELF magic at java.lang.Runtime.loadLibrary

问题 I have build a static library with the Android ndk. I now try to use this library in another Android project //in mainActivity static { System.loadLibrary("MILlib"); } I got the following error when building the test project 02 17:07:24.890 2785-2785/com.MIL.testlib E/AndroidRuntime: FATAL EXCEPTION: main Process: com.MIL.testlib, PID: 2785 java.lang.UnsatisfiedLinkError: dlopen failed: "/data/app/com.MIL.testlib-1/lib/arm/libMILlib.so" has bad ELF magic at java.lang.Runtime.loadLibrary

问题 This is mostly out of curiosity. I understand that definitions for library functions can be replaced (?) if I LD_PRELOAD my own library with my own definition for the library function. Can I do the same for the main method of an executable? That is, without rebuilding the executable, can I do something to the runtime so that a different main() is called? 回答1: No, you cannot use LD_PRELOAD to override the main function of a binary. LD_PRELOAD A whitespace-separated list of additional, user

问题 I am trying to understand how ELF segments are memory mapped. I noticed that various sections are mapped to the same ELF segment. For example, .rodata is mapped to the same segment as .text. Why is this the case? Why not map .rodata to a separate read-only and not executable segment? Also, what does it entail to map the .text section to an "execute ONLY" segment (not readable)? Are there any kernel/HW limitations that may hinder this? EDIT: I may as well add that I am using the GNU linker, if

问题 i want to change the value of an integer declared variable in an executable, by using the hex editor only suppose i know that there's a variable type int declared in the code and the variable is this: int value = 1337; i want to edit the executable using a hex editor search for the value 1337 and change it to something else, i tried ghex in ubuntu but i don't know how to search for it i converted it to hexadecimal but i didn't find it, thanks in advance guys. 回答1: First, you would use readelf

问题 i want to change the value of an integer declared variable in an executable, by using the hex editor only suppose i know that there's a variable type int declared in the code and the variable is this: int value = 1337; i want to edit the executable using a hex editor search for the value 1337 and change it to something else, i tried ghex in ubuntu but i don't know how to search for it i converted it to hexadecimal but i didn't find it, thanks in advance guys. 回答1: First, you would use readelf

问题 There is a shared library elf file, I use readelf -l to see the program headers, the output is: Elf file type is DYN (Shared object file) Entry point 0x0 There are 11 program headers, starting at offset 52 Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align PHDR 0x000034 0x00000034 0x00000034 0x00100 0x00100 R 0x4 INTERP 0x000194 0x00000194 0x00000194 0x00013 0x00013 R 0x1 [Requesting program interpreter: /system/bin/linker] LOAD 0x000000 0x00000000 0x00000000 0x3aa8c4