linux-kernel - [PATCH 0/4] x32 and compat syscall improvements

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Message-Id: <cover.1562185330.git.luto@kernel.org>
Date:   Wed,  3 Jul 2019 13:34:01 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 0/4] x32 and compat syscall improvements

This series contains a couple of minor cleanups and a major change
to the way that x32 syscalls work.  We currently have a range of
syscall numbers starting at 512 that are rather annoying -- they've
been known to cause security problems for seccomp filter authors who
don't know about them, and they cause people to think that x86_64
will run out of syscall numbers after 511 due to a conflict with
x32.

With this series applied, 512-547 can be just a silly legacy oddity
just like all the other silly legacy oddities we have, and we can go
on with our lives without kludges starting at 548 :)

Andy Lutomirski (4):
  x86/syscalls: Use the compat versions of rt_sigsuspend() and
    rt_sigprocmask()
  x86/syscalls: Disallow compat entries for all types of 64-bit syscalls
  x86/syscalls: Split the x32 syscalls into their own table
  x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long

 arch/x86/entry/common.c                       | 13 +--
 arch/x86/entry/syscall_64.c                   | 25 ++++++
 arch/x86/entry/syscalls/syscall_32.tbl        |  4 +-
 arch/x86/entry/syscalls/syscalltbl.sh         | 35 ++++----
 arch/x86/include/asm/syscall.h                |  4 +
 arch/x86/include/asm/unistd.h                 |  6 --
 arch/x86/include/uapi/asm/unistd.h            |  2 +-
 arch/x86/kernel/asm-offsets_64.c              | 20 +++++
 tools/testing/selftests/x86/Makefile          |  2 +-
 .../testing/selftests/x86/syscall_numbering.c | 89 +++++++++++++++++++
 10 files changed, 168 insertions(+), 32 deletions(-)
 create mode 100644 tools/testing/selftests/x86/syscall_numbering.c

-- 
2.21.0