linux-kernel - [PATCH 0/4] x86: decode Xen/KVM emulate prefixes

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: <20220510133036.46767-1-mheyne@amazon.de>
Date:   Tue, 10 May 2022 13:30:29 +0000
From:   Maximilian Heyne <mheyne@...zon.de>
To:     unlisted-recipients:; (no To-header on input)
CC:     Maximilian Heyne <mheyne@...zon.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Sasha Levin <sashal@...nel.org>,
        <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
        <kvm@...r.kernel.org>
Subject: [PATCH 0/4] x86: decode Xen/KVM emulate prefixes

This is a backport of a patch series for 5.4.x.

The patch series allows the x86 decoder to decode the Xen and KVM emulate
prefixes.

In particular this solves the following issue that appeared when commit
db6c6a0df840 ("objtool: Fix noreturn detection for ignored functions") was
backported to 5.4.69:

  arch/x86/xen/enlighten_pv.o: warning: objtool: xen_cpuid()+0x25: can't find jump dest instruction at .text+0x9c

Also now that this decoding is possible, also backport the commit which prevents
kprobes on probing such prefixed instructions. This was also part of the
original series.

The series applied mostly cleanly on 5.4.192 except for a contextual problem in
the 3rd patch ("x86: xen: insn: Decode Xen and KVM emulate-prefix signature").

Masami Hiramatsu (4):
  x86/asm: Allow to pass macros to __ASM_FORM()
  x86: xen: kvm: Gather the definition of emulate prefixes
  x86: xen: insn: Decode Xen and KVM emulate-prefix signature
  x86: kprobes: Prohibit probing on instruction which has emulate prefix

 arch/x86/include/asm/asm.h                  |  8 +++--
 arch/x86/include/asm/emulate_prefix.h       | 14 +++++++++
 arch/x86/include/asm/insn.h                 |  6 ++++
 arch/x86/include/asm/xen/interface.h        | 11 +++----
 arch/x86/kernel/kprobes/core.c              |  4 +++
 arch/x86/kvm/x86.c                          |  4 ++-
 arch/x86/lib/insn.c                         | 34 +++++++++++++++++++++
 tools/arch/x86/include/asm/emulate_prefix.h | 14 +++++++++
 tools/arch/x86/include/asm/insn.h           |  6 ++++
 tools/arch/x86/lib/insn.c                   | 34 +++++++++++++++++++++
 tools/objtool/sync-check.sh                 |  3 +-
 tools/perf/check-headers.sh                 |  3 +-
 12 files changed, 128 insertions(+), 13 deletions(-)
 create mode 100644 arch/x86/include/asm/emulate_prefix.h
 create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h


base-commit: 1d72b776f6dc973211f5d153453cf8955fb3d70a
-- 
2.32.0




Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879