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SubjectRe: How does chown(2) works with symlinks?

>> Linus wrote:
>>If you use "chown()" on the pathname it will change the synlink itself

> This also protects against all sorts of nasty games with symlinks,
> for example the well - known xterm bug, where the program did, as root,

> open("somefile");
> <=== user could do a "rm somefile; ln -s /etc/profile somefile"
> chown(user,group,"somefile");

I don't know this problem; a race-condition in the xterm code.

When symlinks were first introduced, in some implementations the support
was less than perfect. Setting .plan to be a symlink to an unaccessible
file and then 'finger usrname', and a nice race condition with some
printer daemons. Not the kernel's fault, and definitly not the fault
of chown(2) for following symlinks in those implementations :)

markhe


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