linux-kernel - [PATCH v4 0/4] compat: remove compat_alloc_user

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Date:   Tue, 20 Jul 2021 17:09:46 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     linux-arch@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        kexec@...ts.infradead.org
Subject: [PATCH v4 0/4] compat: remove compat_alloc_user_space callers

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

Going through compat_alloc_user_space() to convert indirect system call
arguments tends to add complexity compared to handling the native and
compat logic in the same code.

The drivers/media portion of the longer series is already merged,
and I just resubmitted the net/core and drivers/net portions, so this
is the last main bit.

       Arnd
---

Changes in v4:

- Rebase to v5.14-rc2
- Replace the kexec patch with a version based on Eric Biederman's
  prototype

Changes in v3:

- fix whitespace as pointed out by Christoph Hellwig
- minor build fixes
- rebase to v5.13-rc1

Link: https://lore.kernel.org/lkml/20210517203343.3941777-1-arnd@kernel.org/

Changes in v2:

- address review comments from Christoph Hellwig
- split syscall removal into a separate patch
- replace __X32_COND_SYSCALL() with individual macros for x32

Link: https://lore.kernel.org/lkml/20201208150614.GA15765@infradead.org/

Arnd Bergmann (4):
  kexec: avoid compat_alloc_user_space
  mm: simplify compat_sys_move_pages
  mm: simplify compat numa syscalls
  compat: remove some compat entry points

 arch/arm64/include/asm/unistd32.h         |  10 +-
 arch/mips/kernel/syscalls/syscall_n32.tbl |  10 +-
 arch/mips/kernel/syscalls/syscall_o32.tbl |  10 +-
 arch/parisc/kernel/syscalls/syscall.tbl   |   8 +-
 arch/powerpc/kernel/syscalls/syscall.tbl  |  10 +-
 arch/s390/kernel/syscalls/syscall.tbl     |  10 +-
 arch/sparc/kernel/syscalls/syscall.tbl    |  10 +-
 arch/x86/entry/syscalls/syscall_32.tbl    |   4 +-
 arch/x86/entry/syscalls/syscall_64.tbl    |   2 +-
 include/linux/compat.h                    |  37 +---
 include/uapi/asm-generic/unistd.h         |  10 +-
 kernel/kexec.c                            | 116 ++++++-------
 kernel/sys_ni.c                           |   5 -
 mm/mempolicy.c                            | 196 +++++-----------------
 mm/migrate.c                              |  50 +++---
 15 files changed, 182 insertions(+), 306 deletions(-)

-- 
2.29.2

Cc: Christoph Hellwig <hch@...radead.org>
Cc: linux-arch <linux-arch@...r.kernel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Linux ARM <linux-arm-kernel@...ts.infradead.org>
Cc: linux-kernel@...r.kernel.org
Cc: Linux-MM <linux-mm@...ck.org>
Cc: kexec@...ts.infradead.org