From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Wed, 20 Sep 2017 10:15:56 +0100 Subject: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS In-Reply-To: References: <20170911152635.95367-1-salyzyn@android.com> Message-ID: <20170920091555.GA3782@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Sep 19, 2017 at 03:02:22PM -0700, Kees Cook wrote: > On Mon, Sep 11, 2017 at 8:26 AM, Mark Salyzyn wrote: > > Make it possible to disable the kuser helpers by adding a KUSER_HELPERS > > config option (enabled by default). When disabled, all kuser > > helpers-related code is removed from the kernel and no mapping is done > > at the fixed high address (0xffff0000); any attempt to use a kuser > > helper from a 32-bit process will result in a segfault. > > > > Signed-off-by: Mark Salyzyn > > > > v2: > > - vectors_page and compat_vdso_spec as array of 2 > > - free sigpage if vectors allocation failed > > - adjust makefile so one line for each of the assembler source modules > > - split off assembler changes to a new previous patch in series to reduce churn > > - modify slightly the feature documentation to reduce its reach > > - modify slightly the feature documentation to rationalize the yes default. > > - There are more ifdefs as a result of the rebase. > > > > v3: > > - rebase (minor conflicts) > > This looks great to me. I'd love to see kuser helpers gone. :) > > Catalin, Will, does this need anything else? I haven't had chance to look at the patches yet (buried in other stuff), but I aim to get to it in the next couple of weeks. Will