linux-kernel - [PATCH 0/6] [v2] asm-generic: strncpy_from_user/strnlen

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Date:   Sat, 15 May 2021 12:17:57 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     linux-arch@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Vineet Gupta <vgupta@...opsys.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Brian Cain <bcain@...eaurora.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Sid Manning <sidneym@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-hexagon@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-riscv@...ts.infradead.org, linux-um@...ts.infradead.org
Subject: [PATCH 0/6] [v2] asm-generic: strncpy_from_user/strnlen_user cleanup

From: Arnd Bergmann <arnd@...db.de>

As I've queued up some patches for asm-generic, I remembered an
older series that I created but never submitted.

These two functions appear to be unnecessarily different between
architectures, and the asm-generic version is a bit questionable,
even for NOMMU architectures.

Clean this up to just use the generic library version for anything
that uses the generic version today. I've expanded on the patch
descriptions a little, as suggested by Christoph Hellwig, but I
suspect a more detailed review would uncover additional problems
with the custom versions that are getting removed.

       Arnd

Arnd Bergmann (6):
  [v2] asm-generic/uaccess.h: remove __strncpy_from_user/__strnlen_user
  [v2] h8300: remove stale strncpy_from_user
  [v2] hexagon: use generic strncpy/strnlen from_user
  [v2] arc: use generic strncpy/strnlen from_user
  [v2] asm-generic: uaccess: remove inline
    strncpy_from_user/strnlen_user
  [v2] asm-generic: remove extra strn{cpy_from,len}_user declarations

 arch/arc/Kconfig                    |   2 +
 arch/arc/include/asm/uaccess.h      |  72 ----------------
 arch/arc/mm/extable.c               |  12 ---
 arch/h8300/Kconfig                  |   2 +
 arch/h8300/kernel/h8300_ksyms.c     |   2 -
 arch/h8300/lib/Makefile             |   2 +-
 arch/h8300/lib/strncpy.S            |  35 --------
 arch/hexagon/Kconfig                |   2 +
 arch/hexagon/include/asm/uaccess.h  |  31 -------
 arch/hexagon/kernel/hexagon_ksyms.c |   1 -
 arch/hexagon/mm/Makefile            |   2 +-
 arch/hexagon/mm/strnlen_user.S      | 126 ----------------------------
 arch/m68k/Kconfig                   |   4 +-
 arch/riscv/Kconfig                  |   4 +-
 arch/um/include/asm/uaccess.h       |   5 +-
 arch/um/kernel/skas/uaccess.c       |   5 +-
 include/asm-generic/uaccess.h       |  52 ++----------
 17 files changed, 25 insertions(+), 334 deletions(-)
 delete mode 100644 arch/h8300/lib/strncpy.S
 delete mode 100644 arch/hexagon/mm/strnlen_user.S

-- 
2.29.2

Cc: Christoph Hellwig <hch@....de>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Vineet Gupta <vgupta@...opsys.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Brian Cain <bcain@...eaurora.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>
Cc: Albert Ou <aou@...s.berkeley.edu>
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Sid Manning <sidneym@...eaurora.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: linux-snps-arc@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: uclinux-h8-devel@...ts.sourceforge.jp
Cc: linux-hexagon@...r.kernel.org
Cc: linux-m68k@...ts.linux-m68k.org
Cc: linux-riscv@...ts.infradead.org
Cc: linux-um@...ts.infradead.org
Cc: linux-arch@...r.kernel.org