Web13 jul. 2024 · 通过改写main_arena中的top_chunk的地址,将top_chunk的值改写到 free_hook上方指定的位置,通过不断向top_chunk申请chunk,最终可以分配到包含 … Web12 okt. 2024 · The main arena is the arena that is always there prior to any new threads having been spawned in. M (IS_MMAPPED): The chunk has been obtained through mmap. The other two bits are correspondingly ignored if this bit is set to 1, because mmapped chunks are neither in an arena, nor adjacent to any other free chunks.
heap - GEF - GDB Enhanced Features documentation - GitHub Pages
Web8 dec. 2024 · main_arena的基址存放在libc中的malloc_trim()函数中: 该libc的main_arena偏移位0x397b00,从而计算得到libc基址。 0x02 cat flag 接着利用uaf可以 … Webmain_arena_offset A simple shell script to get main_arena offset of a given libc install download main_arena then enjoy it! Optional: add this shell script to path if you want usage $ main_arena your_libc example clinipharm meloxicam ratte
heap - GEF - GDB Enhanced Features documentation - GitHub Pages
Web13 mei 2024 · If your environment is x86_64 architecture, you might get hints from: How to get the address of main_arena main_arena is defined in malloc.c (glibc) as the local symbol, so not exported. However, it can be found out by parsing symbol table with dl_iterate_phdr and elf.h if gdb running on your environment knows the address of … Web6 mei 2024 · 当smallbin中只有堆a时,main_arena+offset -> fd = main_arena+offset -> bk = a, 当smallbin中有两个堆,堆a和堆b时,此时可以看到main_arena通过fd和bk将a和b连接 成环,通过fd或bk索引都能回到main_arnea+offset。 当smallbin中有更多的堆时,原理和两个堆时一致。 poc Web17 jan. 2024 · main_arena_offset = __malloc_hook_offset+0x10. x = leak_address - (__malloc_hook_address+0x10) libc_base_address = leak_address - (x + … clinipharm neptra