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From:   Brian Gerst <brgerst@gmail.com>
To:     linux-kernel@vger.kernel.org, x86@kernel.org
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Andy Lutomirski <luto@kernel.org>,
        =?UTF-8?q?Mika=20Penttil=C3=A4?= <mpenttil@redhat.com>,
        Brian Gerst <brgerst@gmail.com>
Subject: [PATCH v2 0/6] x86: Clean up fast syscall return validation
Date:   Fri, 21 Jul 2023 12:10:11 -0400
Message-ID: <20230721161018.50214-1-brgerst@gmail.com>
MIME-Version: 1.0
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Precedence: bulk

This patch set cleans up the tests done to determine if a fast syscall
return instruction can be used to return to userspace.  It converts the
code to C, and refactors existing code to be more readable.

v2:
 - Fix shift value for canonical RIP test and use
   __is_canonical_address()

Brian Gerst (6):
  x86/entry/64: Remove obsolete comment on tracing vs. SYSRET
  x86/entry/64: Convert SYSRET validation tests to C
  x86/entry/compat: Combine return value test from syscall handler
  x86/entry/32: Convert do_fast_syscall_32() to bool return type
  x86/entry/32: Remove SEP test for SYSEXIT
  x86/entry/32: Clean up syscall fast exit tests

 arch/x86/entry/common.c          | 99 +++++++++++++++++++++-----------
 arch/x86/entry/entry_32.S        |  2 +-
 arch/x86/entry/entry_64.S        | 68 +---------------------
 arch/x86/entry/entry_64_compat.S | 12 ++--
 arch/x86/include/asm/syscall.h   |  6 +-
 5 files changed, 77 insertions(+), 110 deletions(-)

-- 
2.41.0