sbrk((p-si_addr + (16LL<<22)) & ~4095);
The critical thing to understand is namespaces are visibility walls, not security boundaries. They prevent a process from seeing things outside its namespace. They do not prevent a process from exploiting the kernel that implements the namespace. The process still makes syscalls to the same host kernel. If there is a bug in the kernel’s handling of any syscall, the namespace boundary does not help.
。im钱包官方下载对此有专业解读
// 易错点：升序排序会导致逻辑完全错误（无法判断后车是否追前车）
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