https://github.com/shellphish/how2heap/blob/master/glibc_2.31/overlapping_chunks.c
三块chunk A、B、C，大小分别是
0x80-8、0x500-8、0x80-8（注：32位）
修改B->size为0x581，使B overlappping C
free B，使B进入unsort bin。
malloc D,size为0x580-8（实际大小为0x580)，使得unsort bin上的B chunk利用，
另外B往上覆盖C，这样D与C指向相同地址。
https://github.com/shellphish/how2heap/blob/master/glibc_...
https://github.com/shellphish/how2heap/blob/master/glibc_...
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本文标题：overlapping chunks
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