linux-kernel - [PATCH 0/6] x86: Clean up fast syscall return validation

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Date:   Tue, 18 Jul 2023 09:44:40 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     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 0/6] 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.

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          | 109 +++++++++++++++++++++----------
 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, 87 insertions(+), 110 deletions(-)

-- 
2.41.0