Add demo on GOT (and PLT) analysis #1
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mogasergiu
reviewed
Nov 29, 2020
mogasergiu
reviewed
Nov 29, 2020
mogasergiu
reviewed
Nov 29, 2020
mogasergiu
reviewed
Nov 29, 2020
mogasergiu
reviewed
Nov 29, 2020
mogasergiu
reviewed
Nov 29, 2020
mogasergiu
approved these changes
Nov 29, 2020
danield20
reviewed
Nov 30, 2020
danield20
approved these changes
Nov 30, 2020
razvanvirtan
approved these changes
Nov 30, 2020
lizababu
suggested changes
Dec 3, 2020
got-plt/README.md
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| Starting program: /home/razvan/projects/snippets.git/got-plt/nostdlib/main | ||
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| Temporary breakpoint 1, 0x0000555555554395 in main () | ||
| (gdb) maint info sections |
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this command displays something and it's confusing because here it looks like it shouldn't display anything
tbh, I would remove it; or if you want to present both options, add the output for both
got-plt/README.md
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| 391: 55 push rbp | ||
| 392: 48 89 e5 mov rbp,rsp | ||
| 395: e8 d6 ff ff ff call 370 <flowers@plt> | ||
| 39a: e8 d1 ff ff ff call 370 <flowers@plt> |
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basket.c doesn't disassemble into this, there is only one flower() call in the main function
got-plt/README.md
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| 0x0000555555554391 <+0>: push rbp | ||
| 0x0000555555554392 <+1>: mov rbp,rsp | ||
| 0x0000555555554395 <+4>: call 0x555555554370 <flowers@plt> | ||
| => 0x000055555555439a <+9>: call 0x555555554370 <flowers@plt> |
got-plt/README.md
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| ### Nice to Know | ||
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| The lazy binding feature of the loader can be disabled by using the `-z now` linker option. | ||
| In that case, function addresses will be resolved at load time, and the `.got.plt` entries will be populated from the start with the actual addresses. |
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s/start/beginning so there is no confusion with the start method
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There are two source code files (
main.candbasket.c), a header file (basket.h) and aMakefile. Thebascket.cfile will be compiled into a shared library (libbasket.so). Themain.cwill be compiled and linked against the shared library, resulting in an executablemain. We investigate the resulting files: themainexecutable and thelibbasket.solibrary.We used
nm,objdumpandreadelffor static analysis and GDB for dynamic analysis.