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immutable bit?( linux related)

hi everybody,

	i have a question.
	thinking about security one of the major fears is of some user
gaining root access to a system
  	either remotely or locally.
	yesterday i came accross this commands called chattr and lsattr
which apply to ext2 filesystems
	i learnt that there is this bit which they called the immutable bit
which can be set or unset using 
	the chattr command. Now according to the man pages a file whose
immutable bit is set can be read
	but cannot be written , renamed , or deleted , however it can be
	what if we set the immutable bit for /etc/passwd and /etc/shadow.
both the files would become readonly
	completely.so , there exists no scope of some one changing his UID
to 0 or gaining root access for that 

	well , please consider that i am new to linux security and i am
learning fast and these are just some wild ideas
	i keep getting.They may be even stupid sometimes . however , its fun
to share them with the (linux users group) guys and 	getting their
opinions so please comment on this .  

	Thank you,
		Harshal Vaidya.

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