Date: Mon, 21 Sep 2015 09:53:37 -0700 From: Greg KH <greg@...ah.com> To: oss-security@...ts.openwall.com Subject: Re: s/party/hack like it's 1999 On Mon, Sep 21, 2015 at 04:43:46PM +0000, David Holland wrote: > On Sun, Sep 20, 2015 at 06:26:31AM +0300, Solar Designer wrote: > > > Note that all that was needed for this to happen was for a stray C2 > > > byte from one writer to get injected just before the character-final > > > 9B byte of a multibyte character from another writer. I specifically > > > chose my example so that both writers output data which is well-formed > > > and printable UTF-8, but that was not necessary. > > > > > > Since I see no reasonable application-side mitigation for this, I > > > > Yeah. A user's mitigation may be to avoid running multiple programs at > > a time on a UTF-8 terminal. E.g. running "ps &" appears unsafe > > (although is indeed unlikely to actually be used in a successful > > attack), even if "ps" replaces control characters with question marks. > > I have been arguing for years (but without success) that vt bomb > injection needs to be blocked in the tty driver. This problem > (corruption of concurrent UTF-8 streams) needs to be too, as a matter > of correctness and not even security. How exactly would a tty driver "block" anything like this? A tty driver never looks at the data stream in the kernel, as that way lies madness... thanks, greg k-h
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