linux-kernel - [PATCH v3 0/2] Enable retpoline support only when compiler support

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>] [day] [month] [year] [list]

Message-ID: <7ba46cbd-826d-459b-98d4-b9f4e08dbcda@default>
Date:   Fri, 2 Nov 2018 01:45:40 -0700 (PDT)
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     <linux-kernel@...r.kernel.org>
Cc:     <mingo@...hat.com>, <tglx@...utronix.de>, <dwmw@...zon.co.uk>,
        <srinivas.eeda@...cle.com>, <yamada.masahiro@...ionext.com>,
        <peterz@...radead.org>
Subject: [PATCH v3 0/2] Enable retpoline support only when compiler support

According to PeterZ's suggestion in https://lkml.org/lkml/2018/9/18/1016,
hard bind retpoline with compiler support and remove minimal stuff.

Tested with both CONFIG_RETPOLINE enabled and disabled.

-v3:
Add Suggested-by[Ingo]
Break build if compiler doesn't support retpoline[Dwmw,Tglx,Ingo]

-v2:
Add compiler support check in Kconfig [Masahiro]
Drop 3rd patch as __insn_is_indirect_jump() may be used in some corner case.[PeterZ]

Zhenzhong Duan (2):
  retpolines: Only enable retpoline when compiler support it
  retpolines: Remove the minimal stuff of retpoline support

 arch/x86/Kconfig                     |  4 ----
 arch/x86/Makefile                    |  5 +++--
 arch/x86/include/asm/nospec-branch.h | 12 ++++++------
 arch/x86/kernel/cpu/bugs.c           | 13 ++-----------
 scripts/Makefile.build               |  2 --
 5 files changed, 11 insertions(+), 25 deletions(-)

-- 
1.8.3.1