linux-kernel - [PATCH v4 0/2] Syscall User Redirection

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Message-Id: <20200716193141.4068476-1-krisman@collabora.com>
Date:   Thu, 16 Jul 2020 15:31:39 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, kernel@...labora.com,
        willy@...radead.org, luto@...nel.org, gofmanp@...il.com,
        keescook@...omium.org, linux-kselftest@...r.kernel.org,
        shuah@...nel.org, Gabriel Krisman Bertazi <krisman@...labora.com>
Subject: [PATCH v4 0/2] Syscall User Redirection

Hi,

This is v4 of Syscall User Redirection.  The implementation itself is
not modified from v3, it only applies the latest round of reviews to the
selftests.

__NR_syscalls is not really exported in header files other than
asm-generic for every architecture, so it felt safer to optionally
expose it with a fallback to a high value.

Also, I didn't expose tests for PR_GET as that is not currently
implemented.  If possible, I'd have it supported by a future patchset,
since it is not immediately necessary to support this feature.

Finally, one question: Which tree would this go through?

Gabriel Krisman Bertazi (2):
  kernel: Implement selective syscall userspace redirection
  selftests: Add kselftest for syscall user dispatch

 arch/Kconfig                                  |  20 ++
 arch/x86/Kconfig                              |   1 +
 arch/x86/entry/common.c                       |   5 +
 arch/x86/include/asm/thread_info.h            |   4 +-
 arch/x86/kernel/signal_compat.c               |   2 +-
 fs/exec.c                                     |   2 +
 include/linux/sched.h                         |   3 +
 include/linux/syscall_user_dispatch.h         |  50 ++++
 include/uapi/asm-generic/siginfo.h            |   3 +-
 include/uapi/linux/prctl.h                    |   5 +
 kernel/Makefile                               |   1 +
 kernel/fork.c                                 |   1 +
 kernel/sys.c                                  |   5 +
 kernel/syscall_user_dispatch.c                |  92 +++++++
 tools/testing/selftests/Makefile              |   1 +
 .../syscall_user_dispatch/.gitignore          |   2 +
 .../selftests/syscall_user_dispatch/Makefile  |   9 +
 .../selftests/syscall_user_dispatch/config    |   1 +
 .../syscall_user_dispatch.c                   | 256 ++++++++++++++++++
 19 files changed, 460 insertions(+), 3 deletions(-)
 create mode 100644 include/linux/syscall_user_dispatch.h
 create mode 100644 kernel/syscall_user_dispatch.c
 create mode 100644 tools/testing/selftests/syscall_user_dispatch/.gitignore
 create mode 100644 tools/testing/selftests/syscall_user_dispatch/Makefile
 create mode 100644 tools/testing/selftests/syscall_user_dispatch/config
 create mode 100644 tools/testing/selftests/syscall_user_dispatch/syscall_user_dispatch.c

-- 
2.27.0