linux-kernel - [GIT PULL] objtool/urgent for 5.8

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Date:   Sun, 28 Jun 2020 16:12:45 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86-ml <x86@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: [GIT PULL] objtool/urgent for 5.8

Hi Linus,

please pull three fixes from peterz suppressing KCOV instrumentation in
noinstr sections.

Thx.

---

The following changes since commit b3a9e3b9622ae10064826dccb4f7a52bd88c7407:

  Linux 5.8-rc1 (2020-06-14 12:45:04 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/objtool_urgent_for_5.8_rc3

for you to fetch changes up to 0f1441b44e823a74f3f3780902a113e07c73fbf6:

  objtool: Fix noinstr vs KCOV (2020-06-18 17:36:33 +0200)

----------------------------------------------------------------
Peter Zijlstra says:

Address KCOV vs noinstr. There is no function attribute to selectively
suppress KCOV instrumentation, instead teach objtool to NOP out the
calls in noinstr functions.

This cures a bunch of KCOV crashes (as used by syzcaller).

----------------------------------------------------------------
Peter Zijlstra (3):
      objtool: Clean up elf_write() condition
      objtool: Provide elf_write_{insn,reloc}()
      objtool: Fix noinstr vs KCOV

 arch/x86/Kconfig                          |  2 +-
 tools/objtool/arch.h                      |  2 ++
 tools/objtool/arch/x86/decode.c           | 18 +++++++++++
 tools/objtool/arch/x86/include/arch_elf.h |  6 ++++
 tools/objtool/check.c                     | 23 +++++++++++++-
 tools/objtool/elf.c                       | 53 +++++++++++++++++++++++++++++--
 tools/objtool/elf.h                       | 12 +++++--
 tools/objtool/orc_gen.c                   |  2 +-
 8 files changed, 109 insertions(+), 9 deletions(-)
 create mode 100644 tools/objtool/arch/x86/include/arch_elf.h

-- 
Regards/Gruss,
    Boris.

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