2022-07-25 13:05:35 +02:00
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---
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tags: [linux]
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title: Gdb
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created: '2021-12-05T22:45:44.151Z'
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modified: '2021-12-05T22:46:14.308Z'
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---
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# Gdb
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### Basics
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- `r` ~ run program
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- `ni` ~ step to next instruction
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- `c` ~ coninue execution of program to breakpoint or end of program if no breakpoint is set
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- `b *main` ~ add a breakpoint at main
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- `b *0xdeadbeef` ~ add a breakpoint at a specific addres
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- `info break` ~ list all breakpoints
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- `delete breakpoint <number>` ~ delete breakpoint with provided `number` breakpoint identifier
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- `x/30gx $rsp` ~ display first 30 values, after a stack pointer
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- `x/s 0x0000000040080e` ~ display a **string** at provided addres
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- `disass main` ~ disassembly provided function
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- `x/4i 0x0000000000401393` ~ get 4 instructions on provided address
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#### Show all secitons of a file
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- `info file`
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#### Display current state of registers
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- `info registers`
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#### List all maped memory regions
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- `info proc mappings`
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### Check protections used on a file
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issue command `checksec`
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- `Canary` ~
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- `NX` ~
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- `PIE` ~
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- `Fortify` ~ nobody knows
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- `RelRO` ~
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### ROP gadgedts
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- `~/.local/bin/ROPgadget --binary a.out`
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- registers:
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- `rdi` ~ first argument
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- `rsi` ~ second argument
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### HEAP
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- `vis` ~ show heap visually
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- `heap` ~ display chunks
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- `bins` ~ diplay TCACHE, FASTBIN, UNSORTED BIN pointers
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2022-08-29 15:44:02 +02:00
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### If binary is stripped
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`info file` -> break at entry point
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