linux-kernel - [PATCH v2 0/6] x86: Clean up fast syscall return validation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230721161018.50214-1-brgerst@gmail.com>
Date:   Fri, 21 Jul 2023 12:10:11 -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>,
        Mika Penttilä <mpenttil@...hat.com>,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 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.

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