linux-kernel - [PATCH v2 0/5] all: s390: make compat wrappers the generic solution

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Message-ID: <1456338854-14901-1-git-send-email-ynorov@caviumnetworks.com>
Date:	Wed, 24 Feb 2016 21:34:09 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<heiko.carstens@...ibm.com>, <arnd@...db.de>,
	<catalin.marinas@....com>, <linux-kernel@...r.kernel.org>,
	<linux-s390@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-arch@...r.kernel.org>, <linux-doc@...r.kernel.org>
CC:	<Prasun.Kapoor@...iumnetworks.com>, <pinskia@...il.com>,
	<agraf@...e.de>, <broonie@...nel.org>, <joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>,
	<Nathan_Lynch@...tor.com>, <klimov.linux@...il.com>,
	<bamvor.zhangjian@...wei.com>,
	Yury Norov <ynorov@...iumnetworks.com>
Subject: [PATCH v2 0/5] all: s390: make compat wrappers the generic solution

The problem that makes us use wrappers is that some compat
architectures allows user code to access top halves of registers.
This is not a problem for syscalls that are already handled by compat
code, or for that who has types of the same size in kernel and
userspace. In case of s390 and lp64/ilp32 the problem is in pointer
types, long, unsigned long.

S390 folks already have the solution for it. In this patchset,
it is turned to be general, as arm64/ilp32 needs it too.

This patchset is created as the part of the work of enabling arm64
with ILP32 user mode. See details here:
http://thread.gmane.org/gmane.linux.kernel/2126946

This is the implementation of one of two possible approaches. First
one defines new syscall handler declaration macro, that creates both compat and
non-compat handlers, see [1]. This one declares all wrappers in separated file
kernel/compat_wrapper.c

Build-tested on s390.

[1] http://www.spinics.net/lists/linux-s390/msg11593.html

Yury Norov (5):
  all: syscall wrappers: add documentation
  all: introduce COMPAT_WRAPPER option and enable it for s390
  all: s390: move wrapper infrastructure to generic headers
  all: s390: move compat_wrappers.c from arch/s390/kernel to kernel/
  all: wrap needed syscalls in generic unistd

 Documentation/adding-syscalls.txt |  32 +++++
 arch/Kconfig                      |   4 +
 arch/s390/Kconfig                 |   1 +
 arch/s390/include/asm/compat.h    |  17 ++-
 arch/s390/kernel/Makefile         |   2 +-
 arch/s390/kernel/compat_wrapper.c | 180 ------------------------
 include/linux/compat.h            | 278 ++++++++++++++++++++++++++++++++++++++
 include/linux/syscalls.h          |  57 +-------
 include/linux/syscalls_structs.h  |  60 ++++++++
 include/uapi/asm-generic/unistd.h | 231 +++++++++++++++----------------
 kernel/Makefile                   |   1 +
 kernel/compat_wrapper.c           | 170 +++++++++++++++++++++++
 12 files changed, 680 insertions(+), 353 deletions(-)
 delete mode 100644 arch/s390/kernel/compat_wrapper.c
 create mode 100644 include/linux/syscalls_structs.h
 create mode 100644 kernel/compat_wrapper.c

-- 
2.5.0