From mboxrd@z Thu Jan 1 00:00:00 1970 From: jarkko.sakkinen@linux.intel.com (Jarkko Sakkinen) Date: Wed, 30 Aug 2017 13:15:10 +0300 Subject: [tpmdd-devel] [PATCH RESEND 3/3] tpm-chip: Export TPM device to user space even when startup failed In-Reply-To: <20170829151739.315ae581@kitsune.suse.cz> References: <20170824083714.10016-1-Alexander.Steffen@infineon.com> <20170824083714.10016-4-Alexander.Steffen@infineon.com> <20170825172021.lw3ycxqw63ubrcm2@linux.intel.com> <20170829125509.55aylht3ikes3bpy@linux.intel.com> <20170829151739.315ae581@kitsune.suse.cz> Message-ID: <20170830101510.rlkh2p3zecfsrhgl@linux.intel.com> To: linux-security-module@vger.kernel.org List-Id: linux-security-module.vger.kernel.org On Tue, Aug 29, 2017 at 03:17:39PM +0200, Michal Such?nek wrote: > Hello, > > On Tue, 29 Aug 2017 15:55:09 +0300 > Jarkko Sakkinen wrote: > > > On Mon, Aug 28, 2017 at 05:15:58PM +0000, > > Alexander.Steffen at infineon.com wrote: > > > But is that just because nobody bothered to implement the necessary > > > logic or for some other reason? > > > > We do not want user space to access broken hardware. It's a huge risk > > for system stability and potentially could be used for evil purposes. > > > > This is not going to mainline as it is not suitable for general > > consumption. You must use a patched kernel if you want this. > > > > /Jarkko > > > > It has been pointed out that userspace applications that use direct IO > access exist for the purpose. So using a kernel driver is an > improvement over that if the interface is otherwise sane. > > What do you expect is the potential for instability or evil use? By definition the use of broken hardware can have unpredictable effects. Use a patched kernel if you want to do it. /Jarkko -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html