关于fastbin的范围参考
来源：和媳妇一起学Pwn 之 Secret Garden | Clang裁缝店 (xuanxuanblingbling.github.io)
32位：
| gef fastbin item | chunk size | data interval | fake chunk size |
|---|---|---|---|
| Fastbins[idx=0, size=0x8] | 0x10 | [0x01,0x0c] , [1,12] | [0x10,0x17] |
| Fastbins[idx=1, size=0x10] | 0x18 | [0x0d,0x14] , [13,20] | [0x18,0x1f] |
| Fastbins[idx=2, size=0x18] | 0x20 | [0x15,0x1c] , [21,28] | [0x20,0x27] |
| Fastbins[idx=3, size=0x20] | 0x28 | [0x1d,0x24] , [29,36] | [0x28,0x2f] |
| Fastbins[idx=4, size=0x28] | 0x30 | [0x25,0x2c] , [37,44] | [0x30,0x37] |
| Fastbins[idx=5, size=0x30] | 0x38 | [0x2d,0x34] , [45,52] | [0x38,0x3f] |
| Fastbins[idx=6, size=0x38] | 0x40 | [0x35,0x3c] , [53,60] | [0x40,0x47] |
64 位：
| gef fastbin item | chunk size | data interval | fake chunk size |
|---|---|---|---|
| Fastbins[idx=0, size=0x10] | 0x20 | [0x01,0x18] , [1,24] | [0x20,0x2f] |
| Fastbins[idx=1, size=0x20] | 0x30 | [0x19,0x28] , [25,40] | [0x30,0x3f] |
| Fastbins[idx=2, size=0x30] | 0x40 | [0x29,0x38] , [41,56] | [0x40,0x4f] |
| Fastbins[idx=3, size=0x40] | 0x50 | [0x39,0x48] , [57,72] | [0x50,0x5f] |
| Fastbins[idx=4, size=0x50] | 0x60 | [0x49,0x58] , [73,88] | [0x60,0x6f] |
| Fastbins[idx=5, size=0x60] | 0x70 | [0x59,0x68] , [89,104] | [0x70,0x7f] |
| Fastbins[idx=6, size=0x70] | 0x80 | [0x69,0x78] , [105,120] | [0x80,0x8f] |
