From: salyzyn@android.com (Mark Salyzyn) Date: Tue, 31 Oct 2017 11:42:39 -0700 Subject: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS In-Reply-To: <20170920091555.GA3782@arm.com> References: <20170911152635.95367-1-salyzyn@android.com> <20170920091555.GA3782@arm.com> Message-ID: <065fd365-4635-ddc7-b683-59a5cb16be8f@android.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 09/20/2017 02:15 AM, Will Deacon wrote: > 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 Ping?