文件系统

最新推荐文章于 2023-06-02 16:10:31 发布

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最新推荐文章于 2023-06-02 16:10:31 发布 · 1.2k 阅读

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CC 4.0 BY-SA版权

本文详细介绍了文件系统的组成部分，包括超级块、i节点、目录项数据结构，并通过实例解析了如何从根节点查找/bin/sh的路径。通过根节点找到对应数据块，对比目录项名称，逐步获取bin和sh的i节点，最终定位到sh的代码块。

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文件系统的结构

超级块的数据结构是：

struct super_block {
	unsigned short s_ninodes;
	unsigned short s_nzones;
	unsigned short s_imap_blocks;
	unsigned short s_zmap_blocks;
	unsigned short s_firstdatazone;
	unsigned short s_log_zone_size;
	unsigned long s_max_size;
	unsigned short s_magic;
/* These are only in memory */
	struct buffer_head * s_imap[8];
	struct buffer_head * s_zmap[8];
	unsigned short s_dev;
	struct m_inode * s_isup;
	struct m_inode * s_imount;
	unsigned long s_time;
	struct task_struct * s_wait;
	unsigned char s_lock;
	unsigned char s_rd_only;
	unsigned char s_dirt;
};