Re: [kernel-hardening] Re: [PATCH] proc: restrict access to/proc/interrupts

[Alan Cox]

> /proc/{interrupts,stat} are 0444, which may be used by local attacker to
> learn statistical information about user's keystrokes, including the
> passwords.

So the distro can chmod it 0400

> /dev/pts/* and /dev/tty* leak the same timing information in inode's
> atime and mtime.

That one is trickier. I don't think it is a real leak because the last
update timing info is in seconds granularity so is pretty useless for
that. The atime/mtime behaviour is however required ABI and used by
applications so can't simply go away.

> Do we want to restrict permissions of interrupts/stat and remove atime
> and mtime from ttys and relax these permissions when revoke() is introduced?

revoke makes no difference I can see to either of these, they appear to
be a completely unrelated discussion.
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