linux-kernel - [PATCH v3 0/3] arm64: Add CONFIG_KUSER

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Message-Id: <20170911152635.95367-1-salyzyn@android.com>
Date:   Mon, 11 Sep 2017 08:26:27 -0700
From:   Mark Salyzyn <salyzyn@...roid.com>
To:     linux-kernel@...r.kernel.org
Cc:     kevin.brodsky@....com, catalin.marinas@....com,
        will.deacon@....com, mingo@...nel.org, borntraeger@...ibm.com,
        james.morse@....com, peterz@...radead.org, Dave.Martin@....com,
        credmonster@...il.com, zijun_hu@....com, mark.rutland@....com,
        jszhang@...vell.com, labbott@...hat.com, john.stultz@...aro.org,
        keescook@...omium.org, linux-arm-kernel@...ts.infradead.org,
        takahiro.akashi@...aro.org, mmarek@...e.com,
        ard.biesheuvel@...aro.org, Mark Salyzyn <salyzyn@...roid.com>
Subject: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS

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 <salyzyn@...roid.com>

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)