linux-kernel - [PATCH v3 0/3] x86: Clean up fast syscall return validation

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Message-ID: <20231011224351.130935-1-brgerst@gmail.com>
Date:   Wed, 11 Oct 2023 18:43:48 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH v3 0/3] x86: Clean up fast syscall return validation

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.

v3:
 - Remove patches already applied to -tip.
 - Keep Xen alternatives on the asm side to skip testing the return
   value.
 - Add patch to simplify canonical-RIP test.

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

Brian Gerst (3):
  x86/entry/64: Convert SYSRET validation tests to C
  x86/entry/64: Use TASK_SIZE_MAX for canonical RIP test
  x86/entry/32: Clean up syscall fast exit tests

 arch/x86/entry/common.c        | 91 ++++++++++++++++++++++++----------
 arch/x86/entry/entry_64.S      | 53 +-------------------
 arch/x86/include/asm/syscall.h |  2 +-
 3 files changed, 67 insertions(+), 79 deletions(-)

-- 
2.41.0